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-rw-r--r--src/helper-fns.h104
-rw-r--r--src/helper/CMakeLists.txt46
-rw-r--r--src/helper/README8
-rw-r--r--src/helper/auto-connection.h42
-rw-r--r--src/helper/geom-curves.h55
-rw-r--r--src/helper/geom-nodesatellite.cpp244
-rw-r--r--src/helper/geom-nodesatellite.h109
-rw-r--r--src/helper/geom-nodetype.cpp59
-rw-r--r--src/helper/geom-nodetype.h57
-rw-r--r--src/helper/geom-pathstroke.cpp1158
-rw-r--r--src/helper/geom-pathstroke.h109
-rw-r--r--src/helper/geom-pathvector_nodesatellites.cpp248
-rw-r--r--src/helper/geom-pathvector_nodesatellites.h61
-rw-r--r--src/helper/geom.cpp954
-rw-r--r--src/helper/geom.h54
-rw-r--r--src/helper/gettext.cpp89
-rw-r--r--src/helper/gettext.h33
-rw-r--r--src/helper/mathfns.h83
-rw-r--r--src/helper/pixbuf-ops.cpp157
-rw-r--r--src/helper/pixbuf-ops.h27
-rw-r--r--src/helper/png-write.cpp508
-rw-r--r--src/helper/png-write.h51
-rw-r--r--src/helper/sp-marshal.list10
-rw-r--r--src/helper/stock-items.cpp243
-rw-r--r--src/helper/stock-items.h21
25 files changed, 4530 insertions, 0 deletions
diff --git a/src/helper-fns.h b/src/helper-fns.h
new file mode 100644
index 0000000..27dfc73
--- /dev/null
+++ b/src/helper-fns.h
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_HELPER_FNS_H
+#define SEEN_HELPER_FNS_H
+/*
+ * Authors:
+ * Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
+ *
+ *
+ * Copyright (C) 2006 Hugo Rodrigues
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <vector>
+#include <sstream>
+
+// calling helperfns_read_number(string, false), it's not obvious, what
+// that false stands for. helperfns_read_number(string, HELPERFNS_NO_WARNING)
+// can be more clear.
+#define HELPERFNS_NO_WARNING false
+
+/* convert ascii representation to double
+ * the function can only be used to convert numbers as given by gui elements that use localized representation
+ * @param value ascii representation of the number
+ * @return the converted number
+ *
+ * Setting warning to false disables conversion error warnings from
+ * this function. This can be useful in places, where the input type
+ * is not known beforehand. For example, see sp_feColorMatrix_set in
+ * sp-fecolormatrix.cpp */
+inline double helperfns_read_number(gchar const *value, bool warning = true) {
+ if (!value) {
+ g_warning("Called helperfns_read_number with value==null_ptr, this can lead to unexpected behaviour.");
+ return 0;
+ }
+ char *end;
+ double ret = g_ascii_strtod(value, &end);
+ if (*end) {
+ if (warning) {
+ g_warning("helper-fns::helperfns_read_number() Unable to convert \"%s\" to number", value);
+ }
+ // We could leave this out, too. If strtod can't convert
+ // anything, it will return zero.
+ ret = 0;
+ }
+ return ret;
+}
+
+inline bool helperfns_read_bool(gchar const *value, bool default_value){
+ if (!value) return default_value;
+ switch(value[0]){
+ case 't':
+ if (strncmp(value, "true", 4) == 0) return true;
+ break;
+ case 'f':
+ if (strncmp(value, "false", 5) == 0) return false;
+ break;
+ }
+ return default_value;
+}
+
+/* convert ascii representation to double
+ * the function can only be used to convert numbers as given by gui elements that use localized representation
+ * numbers are delimited by space
+ * @param value ascii representation of the number
+ * @return the vector of the converted numbers
+ */
+inline std::vector<gdouble> helperfns_read_vector(const gchar* value){
+ std::vector<gdouble> v;
+
+ gchar const* beg = value;
+ while(isspace(*beg) || (*beg == ',')) beg++;
+ while(*beg)
+ {
+ char *end;
+ double ret = g_ascii_strtod(beg, &end);
+ if (end==beg){
+ g_warning("helper-fns::helperfns_read_vector() Unable to convert \"%s\" to number", beg);
+ // We could leave this out, too. If strtod can't convert
+ // anything, it will return zero.
+ // ret = 0;
+ break;
+ }
+ v.push_back(ret);
+
+ beg = end;
+ while(isspace(*beg) || (*beg == ',')) beg++;
+ }
+ return v;
+}
+
+#endif /* !SEEN_HELPER_FNS_H */
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/CMakeLists.txt b/src/helper/CMakeLists.txt
new file mode 100644
index 0000000..18baf7b
--- /dev/null
+++ b/src/helper/CMakeLists.txt
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+include(${CMAKE_SOURCE_DIR}/CMakeScripts/UseGlibMarshal.cmake)
+
+GLIB_MARSHAL(sp_marshal sp-marshal "${CMAKE_CURRENT_BINARY_DIR}/helper")
+
+set(sp_marshal_SRC
+ ${CMAKE_CURRENT_BINARY_DIR}/sp-marshal.cpp
+ ${CMAKE_CURRENT_BINARY_DIR}/sp-marshal.h
+)
+
+set(helper_SRC
+ geom.cpp
+ geom-nodetype.cpp
+ geom-pathstroke.cpp
+ geom-pathvector_nodesatellites.cpp
+ geom-nodesatellite.cpp
+ gettext.cpp
+ pixbuf-ops.cpp
+ png-write.cpp
+ stock-items.cpp
+ #units-test.cpp
+
+ # we generate this file and it's .h counter-part
+ ${sp_marshal_SRC}
+
+
+ # -------
+ # Headers
+ geom-curves.h
+ geom-nodetype.h
+ geom-pathstroke.h
+ geom-pathvector_nodesatellites.h
+ geom-nodesatellite.h
+ geom.h
+ gettext.h
+ mathfns.h
+ pixbuf-ops.h
+ png-write.h
+ stock-items.h
+)
+
+set_source_files_properties(sp_marshal_SRC PROPERTIES GENERATED true)
+
+# add_inkscape_lib(helper_LIB "${helper_SRC}")
+add_inkscape_source("${helper_SRC}")
diff --git a/src/helper/README b/src/helper/README
new file mode 100644
index 0000000..d9a6b90
--- /dev/null
+++ b/src/helper/README
@@ -0,0 +1,8 @@
+
+
+This directory contains a variety of helper code.
+
+To do:
+
+* Merge with 'util'.
+* Move individual files to more appropriate directories.
diff --git a/src/helper/auto-connection.h b/src/helper/auto-connection.h
new file mode 100644
index 0000000..368db34
--- /dev/null
+++ b/src/helper/auto-connection.h
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef SEEN_AUTO_CONNECTION_H
+#define SEEN_AUTO_CONNECTION_H
+
+#include <sigc++/connection.h>
+
+namespace Inkscape {
+
+// class to simplify re-subsribing to connections; automates disconnecting
+
+class auto_connection {
+public:
+ auto_connection(const sigc::connection& c): _connection(c) {}
+
+ auto_connection() = default;
+
+ ~auto_connection() {
+ _connection.disconnect();
+ }
+
+ auto_connection(const auto_connection&) = delete;
+ auto_connection& operator = (const auto_connection&) = delete;
+
+ // re-assign
+ auto_connection& operator = (const sigc::connection& c) {
+ _connection.disconnect();
+ _connection = c;
+ return *this;
+ }
+
+ void disconnect() {
+ *this = sigc::connection();
+ }
+
+private:
+ sigc::connection _connection;
+};
+
+} // namespace
+
+#endif
diff --git a/src/helper/geom-curves.h b/src/helper/geom-curves.h
new file mode 100644
index 0000000..08403e2
--- /dev/null
+++ b/src/helper/geom-curves.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_GEOM_CURVES_H
+#define INKSCAPE_HELPER_GEOM_CURVES_H
+
+/**
+ * @file
+ * Specific curve type functions for Inkscape, not provided by lib2geom.
+ */
+/*
+ * Author:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008-2009 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/line.h>
+#include <2geom/bezier-curve.h>
+
+/// \todo un-inline this function
+inline bool is_straight_curve(Geom::Curve const & c)
+{
+ if( dynamic_cast<Geom::LineSegment const*>(&c) )
+ {
+ return true;
+ }
+ // the curve can be a quad/cubic bezier, but could still be a perfect straight line
+ // if the control points are exactly on the line connecting the initial and final points.
+ Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&c);
+ if (curve) {
+ Geom::Line line(curve->initialPoint(), curve->finalPoint());
+ std::vector<Geom::Point> pts = curve->controlPoints();
+ for (unsigned i = 1; i < pts.size() - 1; ++i) {
+ if (!are_near(pts[i], line))
+ return false;
+ }
+ return true;
+ }
+
+ return false;
+}
+
+#endif // INKSCAPE_HELPER_GEOM_CURVES_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-nodesatellite.cpp b/src/helper/geom-nodesatellite.cpp
new file mode 100644
index 0000000..fec75ef
--- /dev/null
+++ b/src/helper/geom-nodesatellite.cpp
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * \brief NodeSatellite a per node holder of data.
+ *//*
+ * Authors:
+ * see git history
+ * 2015 Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/curve.h>
+#include <2geom/nearest-time.h>
+#include <2geom/path-intersection.h>
+#include <2geom/ray.h>
+#include <2geom/sbasis-to-bezier.h>
+#include <helper/geom-nodesatellite.h>
+#include <optional>
+// log cache
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <sys/time.h>
+#include <ctime>
+#endif
+
+///@brief NodeSatellite a per node holder of data.
+NodeSatellite::NodeSatellite() = default;
+
+NodeSatellite::NodeSatellite(NodeSatelliteType nodesatellite_type)
+ : nodesatellite_type(nodesatellite_type)
+ , is_time(false)
+ , selected(false)
+ , has_mirror(false)
+ , hidden(true)
+ , amount(0.0)
+ , angle(0.0)
+ , steps(0)
+{}
+
+NodeSatellite::~NodeSatellite() = default;
+
+///Calculate the time in curve_in with a size of A
+//TODO: find a better place to it
+double timeAtArcLength(double const A, Geom::Curve const &curve_in)
+{
+ if ( A == 0 || curve_in.isDegenerate()) {
+ return 0;
+ }
+
+ Geom::D2<Geom::SBasis> d2_in = curve_in.toSBasis();
+ double t = 0;
+ double length_part = curve_in.length();
+ if (A >= length_part || curve_in.isLineSegment()) {
+ if (length_part != 0) {
+ t = A / length_part;
+ }
+ } else if (!curve_in.isLineSegment()) {
+ std::vector<double> t_roots = roots(Geom::arcLengthSb(d2_in) - A);
+ if (!t_roots.empty()) {
+ t = t_roots[0];
+ }
+ }
+ return t;
+}
+
+///Calculate the size in curve_in with a point at A
+//TODO: find a better place to it
+double arcLengthAt(double const A, Geom::Curve const &curve_in)
+{
+ if ( A == 0 || curve_in.isDegenerate()) {
+ return 0;
+ }
+
+ double s = 0;
+ double length_part = curve_in.length();
+ if (A > length_part || curve_in.isLineSegment()) {
+ s = (A * length_part);
+ } else if (!curve_in.isLineSegment()) {
+ Geom::Curve *curve = curve_in.portion(0.0, A);
+ s = curve->length();
+ delete curve;
+ }
+ return s;
+}
+
+/// Convert a arc radius of a fillet/chamfer to his nodesatellite length -point position where fillet/chamfer knot be on
+/// original curve
+double NodeSatellite::radToLen(double const A, Geom::Curve const &curve_in, Geom::Curve const &curve_out) const
+{
+ double len = 0;
+ Geom::D2<Geom::SBasis> d2_in = curve_in.toSBasis();
+ Geom::D2<Geom::SBasis> d2_out = curve_out.toSBasis();
+ Geom::Piecewise<Geom::D2<Geom::SBasis> > offset_curve0 =
+ Geom::Piecewise<Geom::D2<Geom::SBasis> >(d2_in) +
+ rot90(unitVector(derivative(d2_in))) * (A);
+ Geom::Piecewise<Geom::D2<Geom::SBasis> > offset_curve1 =
+ Geom::Piecewise<Geom::D2<Geom::SBasis> >(d2_out) +
+ rot90(unitVector(derivative(d2_out))) * (A);
+ offset_curve0[0][0].normalize();
+ offset_curve0[0][1].normalize();
+ Geom::Path p0 = path_from_piecewise(offset_curve0, 0.1)[0];
+ offset_curve1[0][0].normalize();
+ offset_curve1[0][1].normalize();
+ Geom::Path p1 = path_from_piecewise(offset_curve1, 0.1)[0];
+ Geom::Crossings cs = Geom::crossings(p0, p1);
+ if (cs.size() > 0) {
+ Geom::Point cp = p0(cs[0].ta);
+ double p0pt = nearest_time(cp, curve_out);
+ len = arcLengthAt(p0pt, curve_out);
+ } else {
+ if (A > 0) {
+ len = radToLen(A * -1, curve_in, curve_out);
+ }
+ }
+ return len;
+}
+
+/// Convert a nodesatellite length -point position where fillet/chamfer knot be on original curve- to a arc radius of
+/// fillet/chamfer
+double NodeSatellite::lenToRad(double const A, Geom::Curve const &curve_in, Geom::Curve const &curve_out,
+ NodeSatellite const previousNodeSatellite) const
+{
+ double time_in = (previousNodeSatellite).time(A, true, curve_in);
+ double time_out = timeAtArcLength(A, curve_out);
+ Geom::Point start_arc_point = curve_in.pointAt(time_in);
+ Geom::Point end_arc_point = curve_out.pointAt(time_out);
+ Geom::Curve *knot_curve1 = curve_in.portion(0, time_in);
+ Geom::Curve *knot_curve2 = curve_out.portion(time_out, 1);
+ Geom::CubicBezier const *cubic1 = dynamic_cast<Geom::CubicBezier const *>(&*knot_curve1);
+ Geom::Ray ray1(start_arc_point, curve_in.pointAt(1));
+ if (cubic1) {
+ ray1.setPoints((*cubic1)[2], start_arc_point);
+ }
+ Geom::CubicBezier const *cubic2 = dynamic_cast<Geom::CubicBezier const *>(&*knot_curve2);
+ Geom::Ray ray2(curve_out.pointAt(0), end_arc_point);
+ if (cubic2) {
+ ray2.setPoints(end_arc_point, (*cubic2)[1]);
+ }
+ bool ccw_toggle = cross(curve_in.pointAt(1) - start_arc_point,
+ end_arc_point - start_arc_point) < 0;
+ double distance_arc =
+ Geom::distance(start_arc_point, middle_point(start_arc_point, end_arc_point));
+ double angle = angle_between(ray1, ray2, ccw_toggle);
+ double divisor = std::sin(angle / 2.0);
+ if (divisor > 0) {
+ return distance_arc / divisor;
+ }
+ return 0;
+}
+
+/// Get the time position of the nodesatellite in curve_in
+double NodeSatellite::time(Geom::Curve const &curve_in, bool inverse) const
+{
+ double t = amount;
+ if (!is_time) {
+ t = time(t, inverse, curve_in);
+ } else if (inverse) {
+ t = 1-t;
+ }
+ if (t > 1) {
+ t = 1;
+ }
+ return t;
+}
+
+///Get the time from a length A in other curve, a boolean inverse given to reverse time
+double NodeSatellite::time(double A, bool inverse, Geom::Curve const &curve_in) const
+{
+ if (A == 0 && inverse) {
+ return 1;
+ }
+ if (A == 0 && !inverse) {
+ return 0;
+ }
+ if (!inverse) {
+ return timeAtArcLength(A, curve_in);
+ }
+ double length_part = curve_in.length();
+ A = length_part - A;
+ return timeAtArcLength(A, curve_in);
+}
+
+/// Get the length of the nodesatellite in curve_in
+double NodeSatellite::arcDistance(Geom::Curve const &curve_in) const
+{
+ double s = amount;
+ if (is_time) {
+ s = arcLengthAt(s, curve_in);
+ }
+ return s;
+}
+
+/// Get the point position of the nodesatellite
+Geom::Point NodeSatellite::getPosition(Geom::Curve const &curve_in, bool inverse) const
+{
+ double t = time(curve_in, inverse);
+ return curve_in.pointAt(t);
+}
+
+/// Set the position of the nodesatellite from a given point P
+void NodeSatellite::setPosition(Geom::Point const p, Geom::Curve const &curve_in, bool inverse)
+{
+ Geom::Curve * curve = const_cast<Geom::Curve *>(&curve_in);
+ if (inverse) {
+ curve = curve->reverse();
+ }
+ double A = Geom::nearest_time(p, *curve);
+ if (!is_time) {
+ A = arcLengthAt(A, *curve);
+ }
+ amount = A;
+}
+
+/// Map a nodesatellite type with gchar
+void NodeSatellite::setNodeSatellitesType(gchar const *A)
+{
+ std::map<std::string, NodeSatelliteType> gchar_map_to_nodesatellite_type = boost::assign::map_list_of("F", FILLET)(
+ "IF", INVERSE_FILLET)("C", CHAMFER)("IC", INVERSE_CHAMFER)("KO", INVALID_SATELLITE);
+ std::map<std::string, NodeSatelliteType>::iterator it = gchar_map_to_nodesatellite_type.find(std::string(A));
+ if (it != gchar_map_to_nodesatellite_type.end()) {
+ nodesatellite_type = it->second;
+ }
+}
+
+/// Map a gchar with nodesatelliteType
+gchar const *NodeSatellite::getNodeSatellitesTypeGchar() const
+{
+ std::map<NodeSatelliteType, gchar const *> nodesatellite_type_to_gchar_map = boost::assign::map_list_of(
+ FILLET, "F")(INVERSE_FILLET, "IF")(CHAMFER, "C")(INVERSE_CHAMFER, "IC")(INVALID_SATELLITE, "KO");
+ return nodesatellite_type_to_gchar_map.at(nodesatellite_type);
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-nodesatellite.h b/src/helper/geom-nodesatellite.h
new file mode 100644
index 0000000..1bb6c54
--- /dev/null
+++ b/src/helper/geom-nodesatellite.h
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * NodeSatellite -- a per node holder of data.
+ *//*
+ * Authors:
+ * see git history
+ * Jabier Arraiza Cenoz<jabier.arraiza@marker.es>
+ *
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_SATELLITE_H
+#define SEEN_SATELLITE_H
+
+#include <map>
+#include <boost/assign.hpp>
+#include <2geom/sbasis-geometric.h>
+#include "util/enums.h"
+
+enum NodeSatelliteType
+{
+ FILLET = 0, // Fillet
+ INVERSE_FILLET, // Inverse Fillet
+ CHAMFER, // Chamfer
+ INVERSE_CHAMFER, // Inverse Chamfer
+ INVALID_SATELLITE // Invalid NodeSatellite
+};
+/**
+ * @brief NodeSatellite a per node holder of data.
+ */
+
+class NodeSatellite
+{
+public:
+ NodeSatellite();
+ NodeSatellite(NodeSatelliteType nodesatellite_type);
+
+ virtual ~NodeSatellite();
+ void setIsTime(bool set_is_time)
+ {
+ is_time = set_is_time;
+ }
+ void setSelected(bool set_selected)
+ {
+ selected = set_selected;
+ }
+ void setHasMirror(bool set_has_mirror)
+ {
+ has_mirror = set_has_mirror;
+ }
+ void setHidden(bool set_hidden)
+ {
+ hidden = set_hidden;
+ }
+ void setAmount(double set_amount)
+ {
+ amount = set_amount;
+ }
+ void setAngle(double set_angle)
+ {
+ angle = set_angle;
+ }
+ void setSteps(size_t set_steps)
+ {
+ steps = set_steps;
+ }
+ double lenToRad(double const A, Geom::Curve const &curve_in, Geom::Curve const &curve_out,
+ NodeSatellite const previousNodeSatellite) const;
+ double radToLen(double const A, Geom::Curve const &curve_in,
+ Geom::Curve const &curve_out) const;
+
+ double time(Geom::Curve const &curve_in, bool inverse = false) const;
+ double time(double A, bool inverse, Geom::Curve const &curve_in) const;
+ double arcDistance(Geom::Curve const &curve_in) const;
+
+ void setPosition(Geom::Point const p, Geom::Curve const &curve_in, bool inverse = false);
+ Geom::Point getPosition(Geom::Curve const &curve_in, bool inverse = false) const;
+
+ void setNodeSatellitesType(gchar const *A);
+ gchar const *getNodeSatellitesTypeGchar() const;
+ NodeSatelliteType nodesatellite_type;
+ // The value stored could be a time value of the nodesatellite in the curve or a length of distance to the node from
+ // the nodesatellite "is_time" tells us if it's a time or length value
+ bool is_time;
+ bool selected;
+ bool has_mirror;
+ bool hidden;
+ // in "amount" we store the time or distance used in the nodesatellite
+ double amount;
+ double angle;
+ size_t steps;
+};
+
+double timeAtArcLength(double const A, Geom::Curve const &curve_in);
+double arcLengthAt(double const A, Geom::Curve const &curve_in);
+
+#endif // SEEN_SATELLITE_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-nodetype.cpp b/src/helper/geom-nodetype.cpp
new file mode 100644
index 0000000..e04b08d
--- /dev/null
+++ b/src/helper/geom-nodetype.cpp
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Specific nodetype geometry functions for Inkscape, not provided my lib2geom.
+ *
+ * Author:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "helper/geom-nodetype.h"
+
+#include <2geom/curve.h>
+
+namespace Geom {
+
+/*
+ * NOTE: THIS METHOD NEVER RETURNS "NODE_SYMM".
+ * Returns the nodetype between c_incoming and c_outgoing. Location of the node is
+ * at c_incoming.pointAt(1) == c_outgoing.pointAt(0). If these two are unequal,
+ * the returned type is NODE_NONE.
+ * Comparison is based on the unitTangent, does not work for NODE_SYMM!
+ */
+NodeType get_nodetype(Curve const &c_incoming, Curve const &c_outgoing)
+{
+ if ( !are_near(c_incoming.pointAt(1), c_outgoing.pointAt(0)) )
+ return NODE_NONE;
+
+ Geom::Curve *crv = c_incoming.reverse();
+ Geom::Point deriv_1 = -crv->unitTangentAt(0);
+ delete crv;
+ Geom::Point deriv_2 = c_outgoing.unitTangentAt(0);
+ double this_angle_L2 = Geom::L2(deriv_1);
+ double next_angle_L2 = Geom::L2(deriv_2);
+ double both_angles_L2 = Geom::L2(deriv_1 + deriv_2);
+ if ( (this_angle_L2 > 1e-6) &&
+ (next_angle_L2 > 1e-6) &&
+ ((this_angle_L2 + next_angle_L2 - both_angles_L2) < 1e-3) )
+ {
+ return NODE_SMOOTH;
+ }
+
+ return NODE_CUSP;
+}
+
+} // end namespace Geom
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-nodetype.h b/src/helper/geom-nodetype.h
new file mode 100644
index 0000000..d7d4d4c
--- /dev/null
+++ b/src/helper/geom-nodetype.h
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_GEOM_NODETYPE_H
+#define INKSCAPE_HELPER_GEOM_NODETYPE_H
+
+/**
+ * @file
+ * Specific nodetype geometry functions for Inkscape, not provided my lib2geom.
+ */
+/*
+ * Author:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+
+namespace Geom {
+
+/**
+ * What kind of node is this? This is the value for the node->type
+ * field. NodeType indicates the degree of continuity required for
+ * the node. I think that the corresponding integer indicates which
+ * derivate is connected. (Thus 2 means that the node is continuous
+ * to the second derivative, i.e. has matching endpoints and tangents)
+ */
+enum NodeType {
+/** Discontinuous node, usually either start or endpoint of a path */
+ NODE_NONE,
+/** This node continuously joins two segments, but the unit tangent is discontinuous.*/
+ NODE_CUSP,
+/** This node continuously joins two segments, with continuous *unit* tangent. */
+ NODE_SMOOTH,
+/** This node is symmetric. I.e. continuously joins two segments with continuous derivative */
+ NODE_SYMM
+};
+
+
+NodeType get_nodetype(Curve const &c_incoming, Curve const &c_outgoing);
+
+
+} // namespace Geom
+
+#endif // INKSCAPE_HELPER_GEOM_NODETYPE_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-pathstroke.cpp b/src/helper/geom-pathstroke.cpp
new file mode 100644
index 0000000..228ea5c
--- /dev/null
+++ b/src/helper/geom-pathstroke.cpp
@@ -0,0 +1,1158 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Authors:
+ * Liam P. White
+ * Tavmjong Bah
+ * Alexander Brock
+ *
+ * Copyright (C) 2014-2015 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <iomanip>
+#include <2geom/path-sink.h>
+#include <2geom/sbasis-to-bezier.h> // cubicbezierpath_from_sbasis
+#include <2geom/path-intersection.h>
+#include <2geom/circle.h>
+
+#include "helper/geom-pathstroke.h"
+
+namespace Geom {
+
+static Point intersection_point(Point origin_a, Point vector_a, Point origin_b, Point vector_b)
+{
+ Coord denom = cross(vector_a, vector_b);
+ if (!are_near(denom,0.)) {
+ Coord t = (cross(vector_b, origin_a) + cross(origin_b, vector_b)) / denom;
+ return origin_a + vector_a*t;
+ }
+ return Point(infinity(), infinity());
+}
+
+/**
+* Find circle that touches inside of the curve, with radius matching the curvature, at time value \c t.
+* Because this method internally uses unitTangentAt, t should be smaller than 1.0 (see unitTangentAt).
+*/
+static Circle touching_circle( D2<SBasis> const &curve, double t, double tol=0.01 )
+{
+ D2<SBasis> dM=derivative(curve);
+ if ( are_near(L2sq(dM(t)), tol) ) {
+ dM=derivative(dM);
+ }
+ if ( are_near(L2sq(dM(t)), tol) ) { // try second time
+ dM=derivative(dM);
+ }
+ Piecewise<D2<SBasis> > unitv = unitVector(dM,tol);
+ Piecewise<SBasis> dMlength = dot(Piecewise<D2<SBasis> >(dM),unitv);
+ Piecewise<SBasis> k = cross(derivative(unitv),unitv);
+ k = divide(k,dMlength,tol,3);
+ double curv = k(t); // note that this value is signed
+
+ Geom::Point normal = unitTangentAt(curve, t).cw();
+ double radius = 1/curv;
+ Geom::Point center = curve(t) + radius*normal;
+ return Geom::Circle(center, fabs(radius));
+}
+
+
+// Area of triangle given three corner points
+static double area( Geom::Point a, Geom::Point b, Geom::Point c ) {
+
+ using Geom::X;
+ using Geom::Y;
+ return( 0.5 * fabs( ( a[X]*(b[Y]-c[Y]) + b[X]*(c[Y]-a[Y]) + c[X]*(a[Y]-b[Y]) ) ) );
+}
+
+// Alternative touching circle routine directly using Beziers. Works only at end points.
+static Circle touching_circle( CubicBezier const &curve, bool start ) {
+
+ double k = 0;
+ Geom::Point p;
+ Geom::Point normal;
+ if ( start ) {
+ double distance = Geom::distance( curve[1], curve[0] );
+ k = 4.0/3.0 * area( curve[0], curve[1], curve[2] ) /
+ (distance * distance * distance);
+ if( Geom::cross(curve[0]-curve[1], curve[1]-curve[2]) < 0 ) {
+ k = -k;
+ }
+ p = curve[0];
+ normal = Geom::Point(curve[1] - curve[0]).cw();
+ normal.normalize();
+ // std::cout << "Start k: " << k << " d: " << distance << " normal: " << normal << std::endl;
+ } else {
+ double distance = Geom::distance( curve[3], curve[2] );
+ k = 4.0/3.0 * area( curve[1], curve[2], curve[3] ) /
+ (distance * distance * distance);
+ if( Geom::cross(curve[1]-curve[2], curve[2]-curve[3]) < 0 ) {
+ k = -k;
+ }
+ p = curve[3];
+ normal = Geom::Point(curve[3] - curve[2]).cw();
+ normal.normalize();
+ // std::cout << "End k: " << k << " d: " << distance << " normal: " << normal << std::endl;
+ }
+ if( k == 0 ) {
+ return Geom::Circle( Geom::Point(0,std::numeric_limits<float>::infinity()),
+ std::numeric_limits<float>::infinity());
+ } else {
+ double radius = 1/k;
+ Geom::Point center = p + normal * radius;
+ return Geom::Circle( center, fabs(radius) );
+ }
+}
+}
+
+namespace {
+
+// Internal data structure
+
+struct join_data {
+ join_data(Geom::Path &_res, Geom::Path const&_outgoing, Geom::Point _in_tang, Geom::Point _out_tang, double _miter, double _width)
+ : res(_res), outgoing(_outgoing), in_tang(_in_tang), out_tang(_out_tang), miter(_miter), width(_width) {};
+
+ // contains the current path that is being built on
+ Geom::Path &res;
+
+ // contains the next curve to append
+ Geom::Path const& outgoing;
+
+ // input tangents
+ Geom::Point in_tang;
+ Geom::Point out_tang;
+
+ // line parameters
+ double miter;
+ double width; // half stroke width
+};
+
+// Join functions must append the outgoing path
+
+typedef void join_func(join_data jd);
+
+void bevel_join(join_data jd)
+{
+ jd.res.appendNew<Geom::LineSegment>(jd.outgoing.initialPoint());
+ jd.res.append(jd.outgoing);
+}
+
+void round_join(join_data jd)
+{
+ jd.res.appendNew<Geom::EllipticalArc>(jd.width, jd.width, 0, false, jd.width <= 0, jd.outgoing.initialPoint());
+ jd.res.append(jd.outgoing);
+}
+
+void miter_join_internal(join_data const &jd, bool clip)
+{
+ using namespace Geom;
+
+ Curve const& incoming = jd.res.back();
+ Curve const& outgoing = jd.outgoing.front();
+ Path &res = jd.res;
+ double width = jd.width, miter = jd.miter;
+
+ Point tang1 = jd.in_tang;
+ Point tang2 = jd.out_tang;
+ Point p = intersection_point(incoming.finalPoint(), tang1, outgoing.initialPoint(), tang2);
+
+ bool satisfied = false;
+ bool inc_ls = res.back_open().degreesOfFreedom() <= 4;
+
+ if (p.isFinite()) {
+ // check size of miter
+ Point point_on_path = incoming.finalPoint() + rot90(tang1)*width;
+ // SVG defines miter length as distance between inner intersection and outer intersection,
+ // which is twice the distance from p to point_on_path but width is half stroke width.
+ satisfied = distance(p, point_on_path) <= miter * width;
+ if (satisfied) {
+ // miter OK, check to see if we can do a relocation
+ if (inc_ls) {
+ res.setFinal(p);
+ } else {
+ res.appendNew<LineSegment>(p);
+ }
+ } else if (clip) {
+ // std::cout << " Clipping ------------ " << std::endl;
+ // miter needs clipping, find two points
+ Point bisector_versor = Line(point_on_path, p).versor();
+ Point point_limit = point_on_path + miter * width * bisector_versor;
+ // std::cout << " bisector_versor: " << bisector_versor << std::endl;
+ // std::cout << " point_limit: " << point_limit << std::endl;
+ Point p1 = intersection_point(incoming.finalPoint(), tang1, point_limit, bisector_versor.cw());
+ Point p2 = intersection_point(outgoing.initialPoint(), tang2, point_limit, bisector_versor.cw());
+ // std::cout << " p1: " << p1 << std::endl;
+ // std::cout << " p2: " << p2 << std::endl;
+ if (inc_ls) {
+ res.setFinal(p1);
+ } else {
+ res.appendNew<LineSegment>(p1);
+ }
+ res.appendNew<LineSegment>(p2);
+ }
+ }
+
+ res.appendNew<LineSegment>(outgoing.initialPoint());
+
+ // check if we can do another relocation
+ bool out_ls = outgoing.degreesOfFreedom() <= 4;
+
+ if ((satisfied || clip) && out_ls) {
+ res.setFinal(outgoing.finalPoint());
+ } else {
+ res.append(outgoing);
+ }
+
+ // either way, add the rest of the path
+ res.insert(res.end(), ++jd.outgoing.begin(), jd.outgoing.end());
+}
+
+void miter_join(join_data jd) { miter_join_internal(jd, false); }
+void miter_clip_join(join_data jd) { miter_join_internal(jd, true); }
+
+Geom::Point pick_solution(std::vector<Geom::ShapeIntersection> points, Geom::Point tang2, Geom::Point endPt)
+{
+ assert(points.size() == 2);
+ Geom::Point sol;
+ if ( dot(tang2, points[0].point() - endPt) > 0 ) {
+ // points[0] is bad, choose points[1]
+ sol = points[1];
+ } else if ( dot(tang2, points[1].point() - endPt) > 0 ) { // points[0] could be good, now check points[1]
+ // points[1] is bad, choose points[0]
+ sol = points[0];
+ } else {
+ // both points are good, choose nearest
+ sol = ( distanceSq(endPt, points[0].point()) < distanceSq(endPt, points[1].point()) )
+ ? points[0].point() : points[1].point();
+ }
+ return sol;
+}
+
+// Arcs line join. If two circles don't intersect, expand inner circle.
+Geom::Point expand_circle( Geom::Circle &inner_circle, Geom::Circle const &outer_circle, Geom::Point const &start_pt, Geom::Point const &start_tangent ) {
+ // std::cout << "expand_circle:" << std::endl;
+ // std::cout << " outer_circle: radius: " << outer_circle.radius() << " center: " << outer_circle.center() << std::endl;
+ // std::cout << " start: point: " << start_pt << " tangent: " << start_tangent << std::endl;
+
+ if( !(outer_circle.contains(start_pt) ) ) {
+ // std::cout << " WARNING: Outer circle does not contain starting point!" << std::endl;
+ return Geom::Point(0,0);
+ }
+
+ Geom::Line secant1(start_pt, start_pt + start_tangent);
+ std::vector<Geom::ShapeIntersection> chord1_pts = outer_circle.intersect(secant1);
+ // std::cout << " chord1: " << chord1_pts[0].point() << ", " << chord1_pts[1].point() << std::endl;
+ Geom::LineSegment chord1(chord1_pts[0].point(), chord1_pts[1].point());
+
+ Geom::Line bisector = make_bisector_line( chord1 );
+ std::vector<Geom::ShapeIntersection> chord2_pts = outer_circle.intersect(bisector);
+ // std::cout << " chord2: " << chord2_pts[0].point() << ", " << chord2_pts[1].point() << std::endl;
+ Geom::LineSegment chord2(chord2_pts[0].point(), chord2_pts[1].point());
+
+ // Find D, point on chord2 and on circle closest to start point
+ Geom::Coord d0 = Geom::distance(chord2_pts[0].point(),start_pt);
+ Geom::Coord d1 = Geom::distance(chord2_pts[1].point(),start_pt);
+ // std::cout << " d0: " << d0 << " d1: " << d1 << std::endl;
+ Geom::Point d = (d0 < d1) ? chord2_pts[0].point() : chord2_pts[1].point();
+ Geom::Line da(d,start_pt);
+
+ // Chord through start point and point D
+ std::vector<Geom::ShapeIntersection> chord3_pts = outer_circle.intersect(da);
+ // std::cout << " chord3: " << chord3_pts[0].point() << ", " << chord3_pts[1].point() << std::endl;
+
+ // Find farthest point on chord3 and on circle (could be more robust)
+ Geom::Coord d2 = Geom::distance(chord3_pts[0].point(),d);
+ Geom::Coord d3 = Geom::distance(chord3_pts[1].point(),d);
+ // std::cout << " d2: " << d2 << " d3: " << d3 << std::endl;
+
+ // Find point P, the intersection of outer circle and new inner circle
+ Geom::Point p = (d2 > d3) ? chord3_pts[0].point() : chord3_pts[1].point();
+
+ // Find center of new circle: it is at the intersection of the bisector
+ // of the chord defined by the start point and point P and a line through
+ // the start point and parallel to the first bisector.
+ Geom::LineSegment chord4(start_pt,p);
+ Geom::Line bisector2 = make_bisector_line( chord4 );
+ Geom::Line diameter = make_parallel_line( start_pt, bisector );
+ std::vector<Geom::ShapeIntersection> center_new = bisector2.intersect( diameter );
+ // std::cout << " center_new: " << center_new[0].point() << std::endl;
+ Geom::Coord r_new = Geom::distance( center_new[0].point(), start_pt );
+ // std::cout << " r_new: " << r_new << std::endl;
+
+ inner_circle.setCenter( center_new[0].point() );
+ inner_circle.setRadius( r_new );
+ return p;
+}
+
+// Arcs line join. If two circles don't intersect, adjust both circles so they just touch.
+// Increase (decrease) the radius of circle 1 and decrease (increase) of circle 2 by the same amount keeping the given points and tangents fixed.
+Geom::Point adjust_circles( Geom::Circle &circle1, Geom::Circle &circle2, Geom::Point const &point1, Geom::Point const &point2, Geom::Point const &tan1, Geom::Point const &tan2 ) {
+
+ Geom::Point n1 = (circle1.center() - point1).normalized(); // Always points towards center
+ Geom::Point n2 = (circle2.center() - point2).normalized();
+ Geom::Point sum_n = n1 + n2;
+
+ double r1 = circle1.radius();
+ double r2 = circle2.radius();
+ double delta_r = r2 - r1;
+ Geom::Point c1 = circle1.center();
+ Geom::Point c2 = circle2.center();
+ Geom::Point delta_c = c2 - c1;
+
+ // std::cout << "adjust_circles:" << std::endl;
+ // std::cout << " norm: " << n1 << "; " << n2 << std::endl;
+ // std::cout << " sum_n: " << sum_n << std::endl;
+ // std::cout << " delta_r: " << delta_r << std::endl;
+ // std::cout << " delta_c: " << delta_c << std::endl;
+
+ // Quadratic equation
+ double A = 4 - sum_n.length() * sum_n.length();
+ double B = 4.0 * delta_r - 2.0 * Geom::dot( delta_c, sum_n );
+ double C = delta_r * delta_r - delta_c.length() * delta_c.length();
+
+ double s1 = 0;
+ double s2 = 0;
+
+ if( fabs(A) < 0.01 ) {
+ // std::cout << " A near zero! $$$$$$$$$$$$$$$$$$" << std::endl;
+ if( B != 0 ) {
+ s1 = -C/B;
+ s2 = -s1;
+ }
+ } else {
+ s1 = (-B + sqrt(B*B - 4*A*C))/(2*A);
+ s2 = (-B - sqrt(B*B - 4*A*C))/(2*A);
+ }
+
+ double dr = (fabs(s1)<=fabs(s2)?s1:s2);
+
+ // std::cout << " A: " << A << std::endl;
+ // std::cout << " B: " << B << std::endl;
+ // std::cout << " C: " << C << std::endl;
+ // std::cout << " s1: " << s1 << " s2: " << s2 << " dr: " << dr << std::endl;
+
+ circle1 = Geom::Circle( c1 - dr*n1, r1-dr );
+ circle2 = Geom::Circle( c2 + dr*n2, r2+dr );
+
+ // std::cout << " C1: " << circle1 << std::endl;
+ // std::cout << " C2: " << circle2 << std::endl;
+ // std::cout << " d': " << Geom::Point( circle1.center() - circle2.center() ).length() << std::endl;
+
+ Geom::Line bisector( circle1.center(), circle2.center() );
+ std::vector<Geom::ShapeIntersection> points = circle1.intersect( bisector );
+ Geom::Point p0 = points[0].point();
+ Geom::Point p1 = points[1].point();
+ // std::cout << " points: " << p0 << "; " << p1 << std::endl;
+ if( std::abs( Geom::distance( p0, circle2.center() ) - circle2.radius() ) <
+ std::abs( Geom::distance( p1, circle2.center() ) - circle2.radius() ) ) {
+ return p0;
+ } else {
+ return p1;
+ }
+}
+
+void extrapolate_join_internal(join_data const &jd, int alternative)
+{
+ // std::cout << "\nextrapolate_join: entrance: alternative: " << alternative << std::endl;
+ using namespace Geom;
+
+ Geom::Path &res = jd.res;
+ Geom::Curve const& incoming = res.back();
+ Geom::Curve const& outgoing = jd.outgoing.front();
+ Geom::Point startPt = incoming.finalPoint();
+ Geom::Point endPt = outgoing.initialPoint();
+ Geom::Point tang1 = jd.in_tang;
+ Geom::Point tang2 = jd.out_tang;
+ // width is half stroke-width
+ double width = jd.width, miter = jd.miter;
+
+ // std::cout << " startPt: " << startPt << " endPt: " << endPt << std::endl;
+ // std::cout << " tang1: " << tang1 << " tang2: " << tang2 << std::endl;
+ // std::cout << " dot product: " << Geom::dot( tang1, tang2 ) << std::endl;
+ // std::cout << " width: " << width << std::endl;
+
+ // CIRCLE CALCULATION TESTING
+ Geom::Circle circle1 = touching_circle(Geom::reverse(incoming.toSBasis()), 0.);
+ Geom::Circle circle2 = touching_circle(outgoing.toSBasis(), 0);
+ // std::cout << " circle1: " << circle1 << std::endl;
+ // std::cout << " circle2: " << circle2 << std::endl;
+ if( Geom::CubicBezier const * in_bezier = dynamic_cast<Geom::CubicBezier const*>(&incoming) ) {
+ Geom::Circle circle_test1 = touching_circle(*in_bezier, false);
+ if( !Geom::are_near( circle1, circle_test1, 0.01 ) ) {
+ // std::cout << " Circle 1 error!!!!!!!!!!!!!!!!!" << std::endl;
+ // std::cout << " " << circle_test1 << std::endl;
+ }
+ }
+ if( Geom::CubicBezier const * out_bezier = dynamic_cast<Geom::CubicBezier const*>(&outgoing) ) {
+ Geom::Circle circle_test2 = touching_circle(*out_bezier, true);
+ if( !Geom::are_near( circle2, circle_test2, 0.01 ) ) {
+ // std::cout << " Circle 2 error!!!!!!!!!!!!!!!!!" << std::endl;
+ // std::cout << " " << circle_test2 << std::endl;
+ }
+ }
+ // END TESTING
+
+ Geom::Point center1 = circle1.center();
+ double side1 = tang1[Geom::X]*(startPt[Geom::Y]-center1[Geom::Y]) - tang1[Geom::Y]*(startPt[Geom::X]-center1[Geom::X]);
+ // std::cout << " side1: " << side1 << std::endl;
+
+ bool inc_ls = !circle1.center().isFinite();
+ bool out_ls = !circle2.center().isFinite();
+
+ std::vector<Geom::ShapeIntersection> points;
+
+ Geom::EllipticalArc *arc1 = nullptr;
+ Geom::EllipticalArc *arc2 = nullptr;
+ Geom::LineSegment *seg1 = nullptr;
+ Geom::LineSegment *seg2 = nullptr;
+ Geom::Point sol;
+ Geom::Point p1;
+ Geom::Point p2;
+
+ if (!inc_ls && !out_ls) {
+ // std::cout << " two circles" << std::endl;
+
+ // See if tangent is backwards (radius < width/2 and circle is inside stroke).
+ Geom::Point node_on_path = startPt + Geom::rot90(tang1)*width;
+ // std::cout << " node_on_path: " << node_on_path << " -------------- " << std::endl;
+ bool b1 = false;
+ bool b2 = false;
+ if (circle1.radius() < width && distance( circle1.center(), node_on_path ) < width) {
+ b1 = true;
+ }
+ if (circle2.radius() < width && distance( circle2.center(), node_on_path ) < width) {
+ b2 = true;
+ }
+ // std::cout << " b1: " << (b1?"true":"false")
+ // << " b2: " << (b2?"true":"false") << std::endl;
+
+ // Two circles
+ points = circle1.intersect(circle2);
+
+ if (points.size() != 2) {
+ // std::cout << " Circles do not intersect, do backup" << std::endl;
+ switch (alternative) {
+ case 1:
+ {
+ // Fallback to round if one path has radius smaller than half line width.
+ if(b1 || b2) {
+ // std::cout << "At one least path has radius smaller than half line width." << std::endl;
+ return( round_join(jd) );
+ }
+
+ Point p;
+ if( circle2.contains( startPt ) && !circle1.contains( endPt ) ) {
+ // std::cout << "Expand circle1" << std::endl;
+ p = expand_circle( circle1, circle2, startPt, tang1 );
+ points.emplace_back( 0, 0, p );
+ points.emplace_back( 0, 0, p );
+ } else if( circle1.contains( endPt ) && !circle2.contains( startPt ) ) {
+ // std::cout << "Expand circle2" << std::endl;
+ p = expand_circle( circle2, circle1, endPt, tang2 );
+ points.emplace_back( 0, 0, p );
+ points.emplace_back( 0, 0, p );
+ } else {
+ // std::cout << "Either both points inside or both outside" << std::endl;
+ return( miter_clip_join(jd) );
+ }
+ break;
+
+ }
+ case 2:
+ {
+ // Fallback to round if one path has radius smaller than half line width.
+ if(b1 || b2) {
+ // std::cout << "At one least path has radius smaller than half line width." << std::endl;
+ return( round_join(jd) );
+ }
+
+ if( ( circle2.contains( startPt ) && !circle1.contains( endPt ) ) ||
+ ( circle1.contains( endPt ) && !circle2.contains( startPt ) ) ) {
+
+ Geom::Point apex = adjust_circles( circle1, circle2, startPt, endPt, tang1, tang2 );
+ points.emplace_back( 0, 0, apex );
+ points.emplace_back( 0, 0, apex );
+ } else {
+ // std::cout << "Either both points inside or both outside" << std::endl;
+ return( miter_clip_join(jd) );
+ }
+
+ break;
+ }
+ case 3:
+ if( side1 > 0 ) {
+ Geom::Line secant(startPt, startPt + tang1);
+ points = circle2.intersect(secant);
+ circle1.setRadius(std::numeric_limits<float>::infinity());
+ circle1.setCenter(Geom::Point(0,std::numeric_limits<float>::infinity()));
+ } else {
+ Geom::Line secant(endPt, endPt + tang2);
+ points = circle1.intersect(secant);
+ circle2.setRadius(std::numeric_limits<float>::infinity());
+ circle2.setCenter(Geom::Point(0,std::numeric_limits<float>::infinity()));
+ }
+ break;
+
+
+ case 0:
+ default:
+ // Do nothing
+ break;
+ }
+ }
+
+ if (points.size() == 2) {
+ sol = pick_solution(points, tang2, endPt);
+ if( circle1.radius() != std::numeric_limits<float>::infinity() ) {
+ arc1 = circle1.arc(startPt, 0.5*(startPt+sol), sol);
+ } else {
+ seg1 = new Geom::LineSegment(startPt, sol);
+ }
+ if( circle2.radius() != std::numeric_limits<float>::infinity() ) {
+ arc2 = circle2.arc(sol, 0.5*(sol+endPt), endPt);
+ } else {
+ seg2 = new Geom::LineSegment(sol, endPt);
+ }
+ }
+ } else if (inc_ls && !out_ls) {
+ // Line and circle
+ // std::cout << " line circle" << std::endl;
+ points = circle2.intersect(Line(incoming.initialPoint(), incoming.finalPoint()));
+ if (points.size() == 2) {
+ sol = pick_solution(points, tang2, endPt);
+ arc2 = circle2.arc(sol, 0.5*(sol+endPt), endPt);
+ }
+ } else if (!inc_ls && out_ls) {
+ // Circle and line
+ // std::cout << " circle line" << std::endl;
+ points = circle1.intersect(Line(outgoing.initialPoint(), outgoing.finalPoint()));
+ if (points.size() == 2) {
+ sol = pick_solution(points, tang2, endPt);
+ arc1 = circle1.arc(startPt, 0.5*(sol+startPt), sol);
+ }
+ }
+ if (points.size() != 2) {
+ // std::cout << " no solutions" << std::endl;
+ // no solutions available, fall back to miter
+ return miter_join(jd);
+ }
+
+ // We have a solution, thus sol is defined.
+ p1 = sol;
+
+ // See if we need to clip. Miter length is measured along a circular arc that is tangent to the
+ // bisector of the incoming and out going angles and passes through the end point (sol) of the
+ // line join.
+
+ // Center of circle is intersection of a line orthogonal to bisector and a line bisecting
+ // a chord connecting the path end point (point_on_path) and the join end point (sol).
+ Geom::Point point_on_path = startPt + Geom::rot90(tang1)*width;
+ Geom::Line bisector = make_angle_bisector_line(startPt, point_on_path, endPt);
+ Geom::Line ortho = make_orthogonal_line(point_on_path, bisector);
+
+ Geom::LineSegment chord(point_on_path, sol);
+ Geom::Line bisector_chord = make_bisector_line(chord);
+
+ Geom::Line limit_line;
+ double miter_limit = width * miter;
+ bool clipped = false;
+
+ if (are_parallel(bisector_chord, ortho)) {
+ // No intersection (can happen if curvatures are equal but opposite)
+ if (Geom::distance(point_on_path, sol) > miter_limit) {
+ clipped = true;
+ Geom::Point temp = bisector.versor();
+ Geom::Point limit_point = point_on_path + miter_limit * temp;
+ limit_line = make_parallel_line( limit_point, ortho );
+ }
+ } else {
+ Geom::Point center =
+ Geom::intersection_point( bisector_chord.pointAt(0), bisector_chord.versor(),
+ ortho.pointAt(0), ortho.versor() );
+ Geom::Coord radius = distance(center, point_on_path);
+ Geom::Circle circle_center(center, radius);
+
+ double limit_angle = miter_limit / radius;
+
+ Geom::Ray start_ray(center, point_on_path);
+ Geom::Ray end_ray(center, sol);
+ Geom::Line limit_line(center, 0); // Angle set below
+
+ if (Geom::cross(start_ray.versor(), end_ray.versor()) < 0) {
+ limit_line.setAngle(start_ray.angle() - limit_angle);
+ } else {
+ limit_line.setAngle(start_ray.angle() + limit_angle);
+ }
+
+ Geom::EllipticalArc *arc_center = circle_center.arc(point_on_path, 0.5*(point_on_path + sol), sol);
+ if (arc_center && arc_center->sweepAngle() > limit_angle) {
+ // We need to clip
+ clipped = true;
+
+ if (!inc_ls) {
+ // Incoming circular
+ points = circle1.intersect(limit_line);
+ if (points.size() == 2) {
+ p1 = pick_solution(points, tang2, endPt);
+ delete arc1;
+ arc1 = circle1.arc(startPt, 0.5*(p1+startPt), p1);
+ }
+ } else {
+ p1 = Geom::intersection_point(startPt, tang1, limit_line.pointAt(0), limit_line.versor());
+ }
+
+ if (!out_ls) {
+ // Outgoing circular
+ points = circle2.intersect(limit_line);
+ if (points.size() == 2) {
+ p2 = pick_solution(points, tang1, endPt);
+ delete arc2;
+ arc2 = circle2.arc(p2, 0.5*(p2+endPt), endPt);
+ }
+ } else {
+ p2 = Geom::intersection_point(endPt, tang2, limit_line.pointAt(0), limit_line.versor());
+ }
+ }
+ }
+
+ // Add initial
+ if (arc1) {
+ res.append(*arc1);
+ } else if (seg1 ) {
+ res.append(*seg1);
+ } else {
+ // Straight line segment: move last point
+ res.setFinal(p1);
+ }
+
+ if (clipped) {
+ res.appendNew<Geom::LineSegment>(p2);
+ }
+
+ // Add outgoing
+ if (arc2) {
+ res.append(*arc2);
+ res.append(outgoing);
+ } else if (seg2 ) {
+ res.append(*seg2);
+ res.append(outgoing);
+ } else {
+ // Straight line segment:
+ res.appendNew<Geom::LineSegment>(outgoing.finalPoint());
+ }
+
+ // add the rest of the path
+ res.insert(res.end(), ++jd.outgoing.begin(), jd.outgoing.end());
+
+ delete arc1;
+ delete arc2;
+ delete seg1;
+ delete seg2;
+}
+
+void extrapolate_join( join_data jd) { extrapolate_join_internal(jd, 0); }
+void extrapolate_join_alt1(join_data jd) { extrapolate_join_internal(jd, 1); }
+void extrapolate_join_alt2(join_data jd) { extrapolate_join_internal(jd, 2); }
+void extrapolate_join_alt3(join_data jd) { extrapolate_join_internal(jd, 3); }
+
+
+void tangents(Geom::Point tang[2], Geom::Curve const& incoming, Geom::Curve const& outgoing)
+{
+ Geom::Point tang1 = Geom::unitTangentAt(reverse(incoming.toSBasis()), 0.);
+ Geom::Point tang2 = outgoing.unitTangentAt(0.);
+ tang[0] = tang1, tang[1] = tang2;
+}
+
+// Offsetting a line segment is mathematically stable and quick to do
+Geom::LineSegment offset_line(Geom::LineSegment const& l, double width)
+{
+ Geom::Point tang1 = Geom::rot90(l.unitTangentAt(0));
+ Geom::Point tang2 = Geom::rot90(unitTangentAt(reverse(l.toSBasis()), 0.));
+
+ Geom::Point start = l.initialPoint() + tang1 * width;
+ Geom::Point end = l.finalPoint() - tang2 * width;
+
+ return Geom::LineSegment(start, end);
+}
+
+void get_cubic_data(Geom::CubicBezier const& bez, double time, double& len, double& rad)
+{
+ // get derivatives
+ std::vector<Geom::Point> derivs = bez.pointAndDerivatives(time, 3);
+
+ Geom::Point der1 = derivs[1]; // first deriv (tangent vector)
+ Geom::Point der2 = derivs[2]; // second deriv (tangent's tangent)
+ double l = Geom::L2(der1); // length
+
+ len = rad = 0;
+
+ // TODO: we might want to consider using Geom::touching_circle to determine the
+ // curvature radius here. Less code duplication, but slower
+
+ if (Geom::are_near(l, 0, 1e-4)) {
+ l = Geom::L2(der2);
+ Geom::Point der3 = derivs.at(3); // try second time
+ if (Geom::are_near(l, 0, 1e-4)) {
+ l = Geom::L2(der3);
+ if (Geom::are_near(l, 0)) {
+ return; // this isn't a segment...
+ }
+ rad = 1e8;
+ } else {
+ rad = -l * (Geom::dot(der2, der2) / Geom::cross(der2, der3));
+ }
+ } else {
+ rad = -l * (Geom::dot(der1, der1) / Geom::cross(der1, der2));
+ }
+ len = l;
+}
+
+double _offset_cubic_stable_sub(
+ Geom::CubicBezier const& bez,
+ Geom::CubicBezier& c,
+ const Geom::Point& start_normal,
+ const Geom::Point& end_normal,
+ const Geom::Point& start_new,
+ const Geom::Point& end_new,
+ const double start_rad,
+ const double end_rad,
+ const double start_len,
+ const double end_len,
+ const double width,
+ const double width_correction) {
+ using Geom::X;
+ using Geom::Y;
+
+ double start_off = 1, end_off = 1;
+ // correction of the lengths of the tangent to the offset
+ if (!Geom::are_near(start_rad, 0))
+ start_off += (width + width_correction) / start_rad;
+ if (!Geom::are_near(end_rad, 0))
+ end_off += (width + width_correction) / end_rad;
+
+ // We don't change the direction of the control points
+ if (start_off < 0) {
+ start_off = 0;
+ }
+ if (end_off < 0) {
+ end_off = 0;
+ }
+ start_off *= start_len;
+ end_off *= end_len;
+ // --------
+
+ Geom::Point mid1_new = start_normal.ccw()*start_off;
+ mid1_new = Geom::Point(start_new[X] + mid1_new[X]/3., start_new[Y] + mid1_new[Y]/3.);
+ Geom::Point mid2_new = end_normal.ccw()*end_off;
+ mid2_new = Geom::Point(end_new[X] - mid2_new[X]/3., end_new[Y] - mid2_new[Y]/3.);
+
+ // create the estimate curve
+ c = Geom::CubicBezier(start_new, mid1_new, mid2_new, end_new);
+
+ // check the tolerance for our estimate to be a parallel curve
+
+ double worst_residual = 0;
+ for (size_t ii = 3; ii <= 7; ii+=2) {
+ const double t = static_cast<double>(ii) / 10;
+ const Geom::Point req = bez.pointAt(t);
+ const Geom::Point chk = c.pointAt(c.nearestTime(req));
+ const double current_residual = (chk-req).length() - std::abs(width);
+ if (std::abs(current_residual) > std::abs(worst_residual)) {
+ worst_residual = current_residual;
+ }
+ }
+ return worst_residual;
+}
+
+void offset_cubic(Geom::Path& p, Geom::CubicBezier const& bez, double width, double tol, size_t levels)
+{
+ using Geom::X;
+ using Geom::Y;
+
+ const Geom::Point start_pos = bez.initialPoint();
+ const Geom::Point end_pos = bez.finalPoint();
+
+ const Geom::Point start_normal = Geom::rot90(bez.unitTangentAt(0));
+ const Geom::Point end_normal = -Geom::rot90(Geom::unitTangentAt(Geom::reverse(bez.toSBasis()), 0.));
+
+ // offset the start and end control points out by the width
+ const Geom::Point start_new = start_pos + start_normal*width;
+ const Geom::Point end_new = end_pos + end_normal*width;
+
+ // --------
+ double start_rad, end_rad;
+ double start_len, end_len; // tangent lengths
+ get_cubic_data(bez, 0, start_len, start_rad);
+ get_cubic_data(bez, 1, end_len, end_rad);
+
+
+ Geom::CubicBezier c;
+
+ double best_width_correction = 0;
+ double best_residual = _offset_cubic_stable_sub(
+ bez, c,
+ start_normal, end_normal,
+ start_new, end_new,
+ start_rad, end_rad,
+ start_len, end_len,
+ width, best_width_correction);
+ double stepsize = std::abs(width)/2;
+ bool seen_success = false;
+ double stepsize_threshold = 0;
+ // std::cout << "Residual from " << best_residual << " ";
+ size_t ii = 0;
+ for (; ii < 100 && stepsize > stepsize_threshold; ++ii) {
+ bool success = false;
+ const double width_correction = best_width_correction - (best_residual > 0 ? 1 : -1) * stepsize;
+ Geom::CubicBezier current_curve;
+ const double residual = _offset_cubic_stable_sub(
+ bez, current_curve,
+ start_normal, end_normal,
+ start_new, end_new,
+ start_rad, end_rad,
+ start_len, end_len,
+ width, width_correction);
+ if (std::abs(residual) < std::abs(best_residual)) {
+ best_residual = residual;
+ best_width_correction = width_correction;
+ c = current_curve;
+ success = true;
+ if (std::abs(best_residual) < tol/4) {
+ break;
+ }
+ }
+
+ if (success) {
+ if (!seen_success) {
+ seen_success = true;
+ //std::cout << "Stepsize factor: " << std::abs(width) / stepsize << std::endl;
+ stepsize_threshold = stepsize / 1000;
+ }
+ }
+ else {
+ stepsize /= 2;
+ }
+ if (std::abs(best_width_correction) >= std::abs(width)/2) {
+ //break; // Seems to prevent some numerical instabilities, not clear if useful
+ }
+ }
+
+ // reached maximum recursive depth
+ // don't bother with any more correction
+ if (levels == 0) {
+ try {
+ p.append(c);
+ }
+ catch (...) {
+ if ((p.finalPoint() - c.initialPoint()).length() < 1e-6) {
+ c.setInitial(p.finalPoint());
+ }
+ else {
+ auto line = Geom::LineSegment(p.finalPoint(), c.initialPoint());
+ p.append(line);
+ }
+ p.append(c);
+ }
+
+ return;
+ }
+
+ // We find the point on our new curve (c) for which the distance between
+ // (c) and (bez) differs the most from the desired distance (width).
+ double worst_err = std::abs(best_residual);
+ double worst_time = .5;
+ for (size_t ii = 1; ii <= 9; ++ii) {
+ const double t = static_cast<double>(ii) / 10;
+ const Geom::Point req = bez.pointAt(t);
+ // We use the exact solution with nearestTime because it is numerically
+ // much more stable than simply assuming that the point on (c) closest
+ // to bez.pointAt(t) is given by c.pointAt(t)
+ const Geom::Point chk = c.pointAt(c.nearestTime(req));
+
+ Geom::Point const diff = req - chk;
+ const double err = std::abs(diff.length() - std::abs(width));
+ if (err > worst_err) {
+ worst_err = err;
+ worst_time = t;
+ }
+ }
+
+ if (worst_err < tol) {
+ if (Geom::are_near(start_new, p.finalPoint())) {
+ p.setFinal(start_new); // if it isn't near, we throw
+ }
+
+ // we're good, curve is accurate enough
+ p.append(c);
+ return;
+ } else {
+ // split the curve in two
+ std::pair<Geom::CubicBezier, Geom::CubicBezier> s = bez.subdivide(worst_time);
+ offset_cubic(p, s.first, width, tol, levels - 1);
+ offset_cubic(p, s.second, width, tol, levels - 1);
+ }
+}
+
+void offset_quadratic(Geom::Path& p, Geom::QuadraticBezier const& bez, double width, double tol, size_t levels)
+{
+ // cheat
+ // it's faster
+ // seriously
+ std::vector<Geom::Point> points = bez.controlPoints();
+ Geom::Point b1 = points[0] + (2./3) * (points[1] - points[0]);
+ Geom::Point b2 = b1 + (1./3) * (points[2] - points[0]);
+ Geom::CubicBezier cub = Geom::CubicBezier(points[0], b1, b2, points[2]);
+ offset_cubic(p, cub, width, tol, levels);
+}
+
+void offset_curve(Geom::Path& res, Geom::Curve const* current, double width, double tolerance)
+{
+ size_t levels = 8;
+
+ if (current->isDegenerate()) return; // don't do anything
+
+ // TODO: we can handle SVGEllipticalArc here as well, do that!
+
+ if (Geom::BezierCurve const *b = dynamic_cast<Geom::BezierCurve const*>(current)) {
+ size_t order = b->order();
+ switch (order) {
+ case 1:
+ res.append(offset_line(static_cast<Geom::LineSegment const&>(*current), width));
+ break;
+ case 2: {
+ Geom::QuadraticBezier const& q = static_cast<Geom::QuadraticBezier const&>(*current);
+ offset_quadratic(res, q, width, tolerance, levels);
+ break;
+ }
+ case 3: {
+ Geom::CubicBezier const& cb = static_cast<Geom::CubicBezier const&>(*current);
+ offset_cubic(res, cb, width, tolerance, levels);
+ break;
+ }
+ default: {
+ Geom::Path sbasis_path = Geom::cubicbezierpath_from_sbasis(current->toSBasis(), tolerance);
+ for (const auto & i : sbasis_path)
+ offset_curve(res, &i, width, tolerance);
+ break;
+ }
+ }
+ } else {
+ Geom::Path sbasis_path = Geom::cubicbezierpath_from_sbasis(current->toSBasis(), 0.1);
+ for (const auto & i : sbasis_path)
+ offset_curve(res, &i, width, tolerance);
+ }
+}
+
+typedef void cap_func(Geom::PathBuilder& res, Geom::Path const& with_dir, Geom::Path const& against_dir, double width);
+
+void flat_cap(Geom::PathBuilder& res, Geom::Path const&, Geom::Path const& against_dir, double)
+{
+ res.lineTo(against_dir.initialPoint());
+}
+
+void round_cap(Geom::PathBuilder& res, Geom::Path const&, Geom::Path const& against_dir, double width)
+{
+ res.arcTo(width / 2., width / 2., 0., true, false, against_dir.initialPoint());
+}
+
+void square_cap(Geom::PathBuilder& res, Geom::Path const& with_dir, Geom::Path const& against_dir, double width)
+{
+ width /= 2.;
+ Geom::Point normal_1 = -Geom::unitTangentAt(Geom::reverse(with_dir.back().toSBasis()), 0.);
+ Geom::Point normal_2 = -against_dir[0].unitTangentAt(0.);
+ res.lineTo(with_dir.finalPoint() + normal_1*width);
+ res.lineTo(against_dir.initialPoint() + normal_2*width);
+ res.lineTo(against_dir.initialPoint());
+}
+
+void peak_cap(Geom::PathBuilder& res, Geom::Path const& with_dir, Geom::Path const& against_dir, double width)
+{
+ width /= 2.;
+ Geom::Point normal_1 = -Geom::unitTangentAt(Geom::reverse(with_dir.back().toSBasis()), 0.);
+ Geom::Point normal_2 = -against_dir[0].unitTangentAt(0.);
+ Geom::Point midpoint = ((with_dir.finalPoint() + normal_1*width) + (against_dir.initialPoint() + normal_2*width)) * 0.5;
+ res.lineTo(midpoint);
+ res.lineTo(against_dir.initialPoint());
+}
+
+} // namespace
+
+namespace Inkscape {
+
+Geom::PathVector outline(
+ Geom::Path const& input,
+ double width,
+ double miter,
+ LineJoinType join,
+ LineCapType butt,
+ double tolerance)
+{
+ if (input.size() == 0) return Geom::PathVector(); // nope, don't even try
+
+ Geom::PathBuilder res;
+ Geom::Path with_dir = half_outline(input, width/2., miter, join, tolerance);
+ Geom::Path against_dir = half_outline(input.reversed(), width/2., miter, join, tolerance);
+ res.moveTo(with_dir[0].initialPoint());
+ res.append(with_dir);
+
+ cap_func *cf;
+ switch (butt) {
+ case BUTT_ROUND:
+ cf = &round_cap;
+ break;
+ case BUTT_SQUARE:
+ cf = &square_cap;
+ break;
+ case BUTT_PEAK:
+ cf = &peak_cap;
+ break;
+ default:
+ cf = &flat_cap;
+ }
+
+ // glue caps
+ if (!input.closed()) {
+ cf(res, with_dir, against_dir, width);
+ } else {
+ res.closePath();
+ res.moveTo(against_dir.initialPoint());
+ }
+
+ res.append(against_dir);
+
+ if (!input.closed()) {
+ cf(res, against_dir, with_dir, width);
+ }
+
+ res.closePath();
+ res.flush();
+ return res.peek();
+}
+
+Geom::Path half_outline(
+ Geom::Path const& input,
+ double width,
+ double miter,
+ LineJoinType join,
+ double tolerance)
+{
+ if (tolerance <= 0) {
+ if (std::abs(width) > 0) {
+ tolerance = 5.0 * (std::abs(width)/100);
+ }
+ else {
+ tolerance = 1e-4;
+ }
+ }
+ Geom::Path res;
+ if (input.size() == 0) return res;
+
+ Geom::Point tang1 = input[0].unitTangentAt(0);
+ Geom::Point start = input.initialPoint() + tang1 * width;
+ Geom::Path temp;
+ Geom::Point tang[2];
+
+ res.setStitching(true);
+ temp.setStitching(true);
+
+ res.start(start);
+
+ // Do two curves at a time for efficiency, since the join function needs to know the outgoing curve as well
+ const Geom::Curve &closingline = input.back_closed();
+ const size_t k = (are_near(closingline.initialPoint(), closingline.finalPoint()) && input.closed() )
+ ?input.size_open():input.size_default();
+
+ for (size_t u = 0; u < k; u += 2) {
+ temp.clear();
+
+ offset_curve(temp, &input[u], width, tolerance);
+
+ // on the first run through, there isn't a join
+ if (u == 0) {
+ res.append(temp);
+ } else {
+ tangents(tang, input[u-1], input[u]);
+ outline_join(res, temp, tang[0], tang[1], width, miter, join);
+ }
+
+ // odd number of paths
+ if (u < k - 1) {
+ temp.clear();
+ offset_curve(temp, &input[u+1], width, tolerance);
+ tangents(tang, input[u], input[u+1]);
+ outline_join(res, temp, tang[0], tang[1], width, miter, join);
+ }
+ }
+ if (input.closed()) {
+ Geom::Curve const &c1 = res.back();
+ Geom::Curve const &c2 = res.front();
+ temp.clear();
+ temp.append(c1);
+ Geom::Path temp2;
+ temp2.append(c2);
+ tangents(tang, input.back(), input.front());
+ outline_join(temp, temp2, tang[0], tang[1], width, miter, join);
+ res.erase(res.begin());
+ res.erase_last();
+ res.append(temp);
+ res.close();
+ }
+ return res;
+}
+
+void outline_join(Geom::Path &res, Geom::Path const& temp, Geom::Point in_tang, Geom::Point out_tang, double width, double miter, Inkscape::LineJoinType join)
+{
+ if (res.size() == 0 || temp.size() == 0)
+ return;
+ Geom::Curve const& outgoing = temp.front();
+ if (Geom::are_near(res.finalPoint(), outgoing.initialPoint(), 0.01)) {
+ // if the points are /that/ close, just ignore this one
+ res.setFinal(temp.initialPoint());
+ res.append(temp);
+ return;
+ }
+
+ join_data jd(res, temp, in_tang, out_tang, miter, width);
+ if (!(Geom::cross(in_tang, out_tang) > 0)) {
+ join = Inkscape::JOIN_BEVEL;
+ }
+ join_func *jf;
+ switch (join) {
+ case Inkscape::JOIN_BEVEL:
+ jf = &bevel_join;
+ break;
+ case Inkscape::JOIN_ROUND:
+ jf = &round_join;
+ break;
+ case Inkscape::JOIN_EXTRAPOLATE:
+ jf = &extrapolate_join;
+ break;
+ case Inkscape::JOIN_EXTRAPOLATE1:
+ jf = &extrapolate_join_alt1;
+ break;
+ case Inkscape::JOIN_EXTRAPOLATE2:
+ jf = &extrapolate_join_alt2;
+ break;
+ case Inkscape::JOIN_EXTRAPOLATE3:
+ jf = &extrapolate_join_alt3;
+ break;
+ case Inkscape::JOIN_MITER_CLIP:
+ jf = &miter_clip_join;
+ break;
+ default:
+ jf = &miter_join;
+ }
+ jf(jd);
+ }
+
+} // namespace Inkscape
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
diff --git a/src/helper/geom-pathstroke.h b/src/helper/geom-pathstroke.h
new file mode 100644
index 0000000..73d35b4
--- /dev/null
+++ b/src/helper/geom-pathstroke.h
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_PATH_STROKE_H
+#define INKSCAPE_HELPER_PATH_STROKE_H
+
+/* Authors:
+ * Liam P. White
+ * Tavmjong Bah
+ *
+ * Copyright (C) 2014-2015 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/path.h>
+#include <2geom/pathvector.h>
+
+namespace Inkscape {
+
+enum LineJoinType {
+ JOIN_BEVEL,
+ JOIN_ROUND,
+ JOIN_MITER,
+ JOIN_MITER_CLIP,
+ JOIN_EXTRAPOLATE,
+ JOIN_EXTRAPOLATE1,
+ JOIN_EXTRAPOLATE2,
+ JOIN_EXTRAPOLATE3,
+};
+
+enum LineCapType {
+ BUTT_FLAT,
+ BUTT_ROUND,
+ BUTT_SQUARE,
+ BUTT_PEAK, // This is not a line ending supported by the SVG standard.
+};
+
+/**
+ * Strokes the path given by @a input.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[in] input Input path.
+ * @param[in] width Stroke width.
+ * @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
+ * @param[in] join Line join type used during offset. Member of LineJoinType enum.
+ * @param[in] cap Line cap type used during stroking. Member of LineCapType enum.
+ * @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
+ *
+ * @return Stroked path.
+ * If the input path is closed, the resultant vector will contain two paths.
+ * Otherwise, there should be only one in the output.
+ */
+Geom::PathVector outline(
+ Geom::Path const& input,
+ double width,
+ double miter,
+ LineJoinType join = JOIN_BEVEL,
+ LineCapType cap = BUTT_FLAT,
+ double tolerance = -1);
+
+/**
+ * Offset the input path by @a width.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[in] input Input path.
+ * @param[in] width Amount to offset.
+ * @param[in] miter Miter limit. Only used when @a join is one of JOIN_MITER, JOIN_MITER_CLIP, and JOIN_EXTRAPOLATE.
+ * @param[in] join Line join type used during offset. Member of LineJoinType enum.
+ * @param[in] tolerance Tolerance, values smaller than 0 lead to automatic tolerance depending on width.
+ *
+ * @return Offsetted output.
+ */
+Geom::Path half_outline(
+ Geom::Path const& input,
+ double width,
+ double miter,
+ LineJoinType join = JOIN_BEVEL,
+ double tolerance = -1);
+
+/**
+ * Builds a join on the provided path.
+ * Joins may behave oddly if the width is negative.
+ *
+ * @param[inout] res The path to build the join on.
+ * The outgoing path (or a portion thereof) will be appended after the join is created.
+ * Previous segments may be modified as an optimization, beware!
+ *
+ * @param[in] outgoing The segment to append on the outgoing portion of the join.
+ * @param[in] in_tang The end tangent to consider on the input path.
+ * @param[in] out_tang The begin tangent to consider on the output path.
+ * @param[in] width
+ * @param[in] miter
+ * @param[in] join
+ */
+void outline_join(Geom::Path &res, Geom::Path const& outgoing, Geom::Point in_tang, Geom::Point out_tang, double width, double miter, LineJoinType join);
+
+} // namespace Inkscape
+
+#endif // INKSCAPE_HELPER_PATH_STROKE_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8 :
diff --git a/src/helper/geom-pathvector_nodesatellites.cpp b/src/helper/geom-pathvector_nodesatellites.cpp
new file mode 100644
index 0000000..2fd4125
--- /dev/null
+++ b/src/helper/geom-pathvector_nodesatellites.cpp
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * PathVectorNodeSatellites a class to manage nodesatellites -per node extra data- in a pathvector
+ *//*
+ * Authors: see git history
+ * Jabiertxof
+ * Nathan Hurst
+ * Johan Engelen
+ * Josh Andler
+ * suv
+ * Mc-
+ * Liam P. White
+ * Krzysztof Kosiński
+ * This code is in public domain
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <helper/geom-pathvector_nodesatellites.h>
+#include <helper/geom.h>
+
+#include "util/units.h"
+
+Geom::PathVector PathVectorNodeSatellites::getPathVector() const
+{
+ return _pathvector;
+}
+
+void PathVectorNodeSatellites::setPathVector(Geom::PathVector pathv)
+{
+ _pathvector = pathv;
+}
+
+NodeSatellites PathVectorNodeSatellites::getNodeSatellites()
+{
+ return _nodesatellites;
+}
+
+void PathVectorNodeSatellites::setNodeSatellites(NodeSatellites nodesatellites)
+{
+ _nodesatellites = nodesatellites;
+}
+
+size_t PathVectorNodeSatellites::getTotalNodeSatellites()
+{
+ size_t counter = 0;
+ for (auto &_nodesatellite : _nodesatellites) {
+ counter += _nodesatellite.size();
+ }
+ return counter;
+}
+
+std::pair<size_t, size_t> PathVectorNodeSatellites::getIndexData(size_t index)
+{
+ size_t counter = 0;
+ for (size_t i = 0; i < _nodesatellites.size(); ++i) {
+ for (size_t j = 0; j < _nodesatellites[i].size(); ++j) {
+ if (index == counter) {
+ return std::make_pair(i,j);
+ }
+ counter++;
+ }
+ }
+ return std::make_pair(0,0);
+}
+
+void PathVectorNodeSatellites::setSelected(std::vector<size_t> selected)
+{
+ size_t counter = 0;
+ for (auto &_nodesatellite : _nodesatellites) {
+ for (auto &j : _nodesatellite) {
+ if (find (selected.begin(), selected.end(), counter) != selected.end()) {
+ j.setSelected(true);
+ } else {
+ j.setSelected(false);
+ }
+ counter++;
+ }
+ }
+}
+
+void PathVectorNodeSatellites::updateSteps(size_t steps, bool apply_no_radius, bool apply_with_radius,
+ bool only_selected)
+{
+ for (auto &_nodesatellite : _nodesatellites) {
+ for (auto &j : _nodesatellite) {
+ if ((!apply_no_radius && j.amount == 0) ||
+ (!apply_with_radius && j.amount != 0))
+ {
+ continue;
+ }
+ if (only_selected) {
+ if (j.selected) {
+ j.steps = steps;
+ }
+ } else {
+ j.steps = steps;
+ }
+ }
+ }
+}
+
+void PathVectorNodeSatellites::updateAmount(double radius, bool apply_no_radius, bool apply_with_radius,
+ bool only_selected, bool use_knot_distance, bool flexible)
+{
+ double power = 0;
+ if (!flexible) {
+ power = radius;
+ } else {
+ power = radius / 100;
+ }
+ for (size_t i = 0; i < _nodesatellites.size(); ++i) {
+ for (size_t j = 0; j < _nodesatellites[i].size(); ++j) {
+ std::optional<size_t> previous_index = std::nullopt;
+ if (j == 0 && _pathvector[i].closed()) {
+ previous_index = count_path_nodes(_pathvector[i]) - 1;
+ } else if (!_pathvector[i].closed() || j != 0) {
+ previous_index = j - 1;
+ }
+ if (!_pathvector[i].closed() && j == 0) {
+ _nodesatellites[i][j].amount = 0;
+ continue;
+ }
+ if (count_path_nodes(_pathvector[i]) == j) {
+ continue;
+ }
+ if ((!apply_no_radius && _nodesatellites[i][j].amount == 0) ||
+ (!apply_with_radius && _nodesatellites[i][j].amount != 0)) {
+ continue;
+ }
+
+ if (_nodesatellites[i][j].selected || !only_selected) {
+ if (!use_knot_distance && !flexible) {
+ if (previous_index) {
+ _nodesatellites[i][j].amount =
+ _nodesatellites[i][j].radToLen(power, _pathvector[i][*previous_index], _pathvector[i][j]);
+ if (power && !_nodesatellites[i][j].amount) {
+ g_warning("Seems a too high radius value");
+ }
+ } else {
+ _nodesatellites[i][j].amount = 0.0;
+ }
+ } else {
+ _nodesatellites[i][j].amount = power;
+ }
+ }
+ }
+ }
+}
+
+void PathVectorNodeSatellites::convertUnit(Glib::ustring in, Glib::ustring to, bool apply_no_radius,
+ bool apply_with_radius)
+{
+ for (size_t i = 0; i < _nodesatellites.size(); ++i) {
+ for (size_t j = 0; j < _nodesatellites[i].size(); ++j) {
+ if (!_pathvector[i].closed() && j == 0) {
+ _nodesatellites[i][j].amount = 0;
+ continue;
+ }
+ if (count_path_nodes(_pathvector[i]) == j) {
+ continue;
+ }
+ if ((!apply_no_radius && _nodesatellites[i][j].amount == 0) ||
+ (!apply_with_radius && _nodesatellites[i][j].amount != 0)) {
+ continue;
+ }
+ _nodesatellites[i][j].amount =
+ Inkscape::Util::Quantity::convert(_nodesatellites[i][j].amount, in.c_str(), to.c_str());
+ }
+ }
+}
+
+void PathVectorNodeSatellites::updateNodeSatelliteType(NodeSatelliteType nodesatellitetype, bool apply_no_radius,
+ bool apply_with_radius, bool only_selected)
+{
+ for (size_t i = 0; i < _nodesatellites.size(); ++i) {
+ for (size_t j = 0; j < _nodesatellites[i].size(); ++j) {
+ if ((!apply_no_radius && _nodesatellites[i][j].amount == 0) ||
+ (!apply_with_radius && _nodesatellites[i][j].amount != 0)) {
+ continue;
+ }
+ if (count_path_nodes(_pathvector[i]) == j) {
+ if (!only_selected) {
+ _nodesatellites[i][j].nodesatellite_type = nodesatellitetype;
+ }
+ continue;
+ }
+ if (only_selected) {
+ if (_nodesatellites[i][j].selected) {
+ _nodesatellites[i][j].nodesatellite_type = nodesatellitetype;
+ }
+ } else {
+ _nodesatellites[i][j].nodesatellite_type = nodesatellitetype;
+ }
+ }
+ }
+}
+
+void PathVectorNodeSatellites::recalculateForNewPathVector(Geom::PathVector const pathv, NodeSatellite const S)
+{
+ // pathv && _pathvector came here:
+ // * with different number of nodes
+ // * without empty subpats
+ // * _pathvector and nodesatellites (old data) are paired
+ NodeSatellites nodesatellites;
+ bool found = false;
+ // TODO evaluate fix on nodes at same position
+ // size_t number_nodes = count_pathvector_nodes(pathv);
+ // size_t previous_number_nodes = getTotalNodeSatellites();
+ for (const auto & i : pathv) {
+ std::vector<NodeSatellite> path_nodesatellites;
+ size_t count = count_path_nodes(i);
+ for (size_t j = 0; j < count; j++) {
+ found = false;
+ for (size_t k = 0; k < _pathvector.size(); k++) {
+ size_t count2 = count_path_nodes(_pathvector[k]);
+ for (size_t l = 0; l < count2; l++) {
+ if (Geom::are_near(_pathvector[k][l].initialPoint(), i[j].initialPoint())) {
+ path_nodesatellites.push_back(_nodesatellites[k][l]);
+ found = true;
+ break;
+ }
+ }
+ if (found) {
+ break;
+ }
+ }
+ if (!found) {
+ path_nodesatellites.push_back(S);
+ }
+ }
+ nodesatellites.push_back(path_nodesatellites);
+ }
+ setPathVector(pathv);
+ setNodeSatellites(nodesatellites);
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom-pathvector_nodesatellites.h b/src/helper/geom-pathvector_nodesatellites.h
new file mode 100644
index 0000000..4631b32
--- /dev/null
+++ b/src/helper/geom-pathvector_nodesatellites.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * \brief PathVectorNodeSatellites a class to manage nodesatellites -per node extra data- in a pathvector
+ *//*
+ * Authors: see git history
+ * Jabiertxof
+ * Nathan Hurst
+ * Johan Engelen
+ * Josh Andler
+ * suv
+ * Mc-
+ * Liam P. White
+ * Krzysztof Kosiński
+ *
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_PATHVECTORSATELLITES_H
+#define SEEN_PATHVECTORSATELLITES_H
+
+#include <2geom/path.h>
+#include <2geom/pathvector.h>
+#include <helper/geom-nodesatellite.h>
+
+typedef std::vector<std::vector<NodeSatellite>> NodeSatellites;
+///@brief PathVectorNodeSatellites a class to manage nodesatellites in a pathvector
+class PathVectorNodeSatellites
+{
+public:
+ Geom::PathVector getPathVector() const;
+ void setPathVector(Geom::PathVector pathv);
+ NodeSatellites getNodeSatellites();
+ void setNodeSatellites(NodeSatellites nodesatellites);
+ size_t getTotalNodeSatellites();
+ void setSelected(std::vector<size_t> selected);
+ void updateSteps(size_t steps, bool apply_no_radius, bool apply_with_radius, bool only_selected);
+ void updateAmount(double radius, bool apply_no_radius, bool apply_with_radius, bool only_selected,
+ bool use_knot_distance, bool flexible);
+ void convertUnit(Glib::ustring in, Glib::ustring to, bool apply_no_radius, bool apply_with_radius);
+ void updateNodeSatelliteType(NodeSatelliteType nodesatellitetype, bool apply_no_radius, bool apply_with_radius,
+ bool only_selected);
+ std::pair<size_t, size_t> getIndexData(size_t index);
+ void recalculateForNewPathVector(Geom::PathVector const pathv, NodeSatellite const S);
+
+private:
+ Geom::PathVector _pathvector;
+ NodeSatellites _nodesatellites;
+};
+
+#endif //SEEN_PATHVECTORSATELLITES_H
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom.cpp b/src/helper/geom.cpp
new file mode 100644
index 0000000..da2b63c
--- /dev/null
+++ b/src/helper/geom.cpp
@@ -0,0 +1,954 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Specific geometry functions for Inkscape, not provided my lib2geom.
+ *
+ * Author:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <algorithm>
+#include "helper/geom.h"
+#include "helper/geom-curves.h"
+#include <2geom/curves.h>
+#include <2geom/sbasis-to-bezier.h>
+
+using Geom::X;
+using Geom::Y;
+
+//#################################################################################
+// BOUNDING BOX CALCULATIONS
+
+/* Fast bbox calculation */
+/* Thanks to Nathan Hurst for suggesting it */
+static void
+cubic_bbox (Geom::Coord x000, Geom::Coord y000, Geom::Coord x001, Geom::Coord y001, Geom::Coord x011, Geom::Coord y011, Geom::Coord x111, Geom::Coord y111, Geom::Rect &bbox)
+{
+ Geom::Coord a, b, c, D;
+
+ bbox[0].expandTo(x111);
+ bbox[1].expandTo(y111);
+
+ // It already contains (x000,y000) and (x111,y111)
+ // All points of the Bezier lie in the convex hull of (x000,y000), (x001,y001), (x011,y011) and (x111,y111)
+ // So, if it also contains (x001,y001) and (x011,y011) we don't have to compute anything else!
+ // Note that we compute it for the X and Y range separately to make it easier to use them below
+ bool containsXrange = bbox[0].contains(x001) && bbox[0].contains(x011);
+ bool containsYrange = bbox[1].contains(y001) && bbox[1].contains(y011);
+
+ /*
+ * xttt = s * (s * (s * x000 + t * x001) + t * (s * x001 + t * x011)) + t * (s * (s * x001 + t * x011) + t * (s * x011 + t * x111))
+ * xttt = s * (s2 * x000 + s * t * x001 + t * s * x001 + t2 * x011) + t * (s2 * x001 + s * t * x011 + t * s * x011 + t2 * x111)
+ * xttt = s * (s2 * x000 + 2 * st * x001 + t2 * x011) + t * (s2 * x001 + 2 * st * x011 + t2 * x111)
+ * xttt = s3 * x000 + 2 * s2t * x001 + st2 * x011 + s2t * x001 + 2st2 * x011 + t3 * x111
+ * xttt = s3 * x000 + 3s2t * x001 + 3st2 * x011 + t3 * x111
+ * xttt = s3 * x000 + (1 - s) 3s2 * x001 + (1 - s) * (1 - s) * 3s * x011 + (1 - s) * (1 - s) * (1 - s) * x111
+ * xttt = s3 * x000 + (3s2 - 3s3) * x001 + (3s - 6s2 + 3s3) * x011 + (1 - 2s + s2 - s + 2s2 - s3) * x111
+ * xttt = (x000 - 3 * x001 + 3 * x011 - x111) * s3 +
+ * ( 3 * x001 - 6 * x011 + 3 * x111) * s2 +
+ * ( 3 * x011 - 3 * x111) * s +
+ * ( x111)
+ * xttt' = (3 * x000 - 9 * x001 + 9 * x011 - 3 * x111) * s2 +
+ * ( 6 * x001 - 12 * x011 + 6 * x111) * s +
+ * ( 3 * x011 - 3 * x111)
+ */
+
+ if (!containsXrange) {
+ a = 3 * x000 - 9 * x001 + 9 * x011 - 3 * x111;
+ b = 6 * x001 - 12 * x011 + 6 * x111;
+ c = 3 * x011 - 3 * x111;
+
+ /*
+ * s = (-b +/- sqrt (b * b - 4 * a * c)) / 2 * a;
+ */
+ if (fabs (a) < Geom::EPSILON) {
+ /* s = -c / b */
+ if (fabs (b) > Geom::EPSILON) {
+ double s;
+ s = -c / b;
+ if ((s > 0.0) && (s < 1.0)) {
+ double t = 1.0 - s;
+ double xttt = s * s * s * x000 + 3 * s * s * t * x001 + 3 * s * t * t * x011 + t * t * t * x111;
+ bbox[0].expandTo(xttt);
+ }
+ }
+ } else {
+ /* s = (-b +/- sqrt (b * b - 4 * a * c)) / 2 * a; */
+ D = b * b - 4 * a * c;
+ if (D >= 0.0) {
+ Geom::Coord d, s, t, xttt;
+ /* Have solution */
+ d = sqrt (D);
+ s = (-b + d) / (2 * a);
+ if ((s > 0.0) && (s < 1.0)) {
+ t = 1.0 - s;
+ xttt = s * s * s * x000 + 3 * s * s * t * x001 + 3 * s * t * t * x011 + t * t * t * x111;
+ bbox[0].expandTo(xttt);
+ }
+ s = (-b - d) / (2 * a);
+ if ((s > 0.0) && (s < 1.0)) {
+ t = 1.0 - s;
+ xttt = s * s * s * x000 + 3 * s * s * t * x001 + 3 * s * t * t * x011 + t * t * t * x111;
+ bbox[0].expandTo(xttt);
+ }
+ }
+ }
+ }
+
+ if (!containsYrange) {
+ a = 3 * y000 - 9 * y001 + 9 * y011 - 3 * y111;
+ b = 6 * y001 - 12 * y011 + 6 * y111;
+ c = 3 * y011 - 3 * y111;
+
+ if (fabs (a) < Geom::EPSILON) {
+ /* s = -c / b */
+ if (fabs (b) > Geom::EPSILON) {
+ double s;
+ s = -c / b;
+ if ((s > 0.0) && (s < 1.0)) {
+ double t = 1.0 - s;
+ double yttt = s * s * s * y000 + 3 * s * s * t * y001 + 3 * s * t * t * y011 + t * t * t * y111;
+ bbox[1].expandTo(yttt);
+ }
+ }
+ } else {
+ /* s = (-b +/- sqrt (b * b - 4 * a * c)) / 2 * a; */
+ D = b * b - 4 * a * c;
+ if (D >= 0.0) {
+ Geom::Coord d, s, t, yttt;
+ /* Have solution */
+ d = sqrt (D);
+ s = (-b + d) / (2 * a);
+ if ((s > 0.0) && (s < 1.0)) {
+ t = 1.0 - s;
+ yttt = s * s * s * y000 + 3 * s * s * t * y001 + 3 * s * t * t * y011 + t * t * t * y111;
+ bbox[1].expandTo(yttt);
+ }
+ s = (-b - d) / (2 * a);
+ if ((s > 0.0) && (s < 1.0)) {
+ t = 1.0 - s;
+ yttt = s * s * s * y000 + 3 * s * s * t * y001 + 3 * s * t * t * y011 + t * t * t * y111;
+ bbox[1].expandTo(yttt);
+ }
+ }
+ }
+ }
+}
+
+Geom::OptRect
+bounds_fast_transformed(Geom::PathVector const & pv, Geom::Affine const & t)
+{
+ return bounds_exact_transformed(pv, t); //use this as it is faster for now! :)
+// return Geom::bounds_fast(pv * t);
+}
+
+Geom::OptRect
+bounds_exact_transformed(Geom::PathVector const & pv, Geom::Affine const & t)
+{
+ if (pv.empty())
+ return Geom::OptRect();
+
+ Geom::Point initial = pv.front().initialPoint() * t;
+ Geom::Rect bbox(initial, initial); // obtain well defined bbox as starting point to unionWith
+
+ for (const auto & it : pv) {
+ bbox.expandTo(it.initialPoint() * t);
+
+ // don't loop including closing segment, since that segment can never increase the bbox
+ for (Geom::Path::const_iterator cit = it.begin(); cit != it.end_open(); ++cit) {
+ Geom::Curve const &c = *cit;
+
+ unsigned order = 0;
+ if (Geom::BezierCurve const* b = dynamic_cast<Geom::BezierCurve const*>(&c)) {
+ order = b->order();
+ }
+
+ if (order == 1) { // line segment
+ bbox.expandTo(c.finalPoint() * t);
+
+ // TODO: we can make the case for quadratics faster by degree elevating them to
+ // cubic and then taking the bbox of that.
+
+ } else if (order == 3) { // cubic bezier
+ Geom::CubicBezier const &cubic_bezier = static_cast<Geom::CubicBezier const&>(c);
+ Geom::Point c0 = cubic_bezier[0] * t;
+ Geom::Point c1 = cubic_bezier[1] * t;
+ Geom::Point c2 = cubic_bezier[2] * t;
+ Geom::Point c3 = cubic_bezier[3] * t;
+ cubic_bbox(c0[0], c0[1], c1[0], c1[1], c2[0], c2[1], c3[0], c3[1], bbox);
+ } else {
+ // should handle all not-so-easy curves:
+ Geom::Curve *ctemp = cit->transformed(t);
+ bbox.unionWith( ctemp->boundsExact());
+ delete ctemp;
+ }
+ }
+ }
+ //return Geom::bounds_exact(pv * t);
+ return bbox;
+}
+
+bool
+pathv_similar(Geom::PathVector const &apv, Geom::PathVector const &bpv, double precission)
+{
+ if (apv == bpv) {
+ return true;
+ }
+ size_t totala = apv.curveCount();
+ if (totala != bpv.curveCount()) {
+ return false;
+ }
+ std::vector<Geom::Coord> pos;
+ for (size_t i = 0; i < totala; i++) {
+ Geom::Point pointa = apv.pointAt(float(i)+0.2);
+ Geom::Point pointb = bpv.pointAt(float(i)+0.2);
+ Geom::Point pointc = apv.pointAt(float(i)+0.4);
+ Geom::Point pointd = bpv.pointAt(float(i)+0.4);
+ Geom::Point pointe = apv.pointAt(float(i));
+ Geom::Point pointf = bpv.pointAt(float(i));
+ if (!Geom::are_near(pointa[Geom::X], pointb[Geom::X], precission) ||
+ !Geom::are_near(pointa[Geom::Y], pointb[Geom::Y], precission) ||
+ !Geom::are_near(pointc[Geom::X], pointd[Geom::X], precission) ||
+ !Geom::are_near(pointc[Geom::Y], pointd[Geom::Y], precission) ||
+ !Geom::are_near(pointe[Geom::X], pointf[Geom::X], precission) ||
+ !Geom::are_near(pointe[Geom::Y], pointf[Geom::Y], precission))
+ {
+ return false;
+ }
+ }
+ return true;
+}
+
+static void
+geom_line_wind_distance (Geom::Coord x0, Geom::Coord y0, Geom::Coord x1, Geom::Coord y1, Geom::Point const &pt, int *wind, Geom::Coord *best)
+{
+ Geom::Coord Ax, Ay, Bx, By, Dx, Dy, s;
+ Geom::Coord dist2;
+
+ /* Find distance */
+ Ax = x0;
+ Ay = y0;
+ Bx = x1;
+ By = y1;
+ Dx = x1 - x0;
+ Dy = y1 - y0;
+ const Geom::Coord Px = pt[X];
+ const Geom::Coord Py = pt[Y];
+
+ if (best) {
+ s = ((Px - Ax) * Dx + (Py - Ay) * Dy) / (Dx * Dx + Dy * Dy);
+ if (s <= 0.0) {
+ dist2 = (Px - Ax) * (Px - Ax) + (Py - Ay) * (Py - Ay);
+ } else if (s >= 1.0) {
+ dist2 = (Px - Bx) * (Px - Bx) + (Py - By) * (Py - By);
+ } else {
+ Geom::Coord Qx, Qy;
+ Qx = Ax + s * Dx;
+ Qy = Ay + s * Dy;
+ dist2 = (Px - Qx) * (Px - Qx) + (Py - Qy) * (Py - Qy);
+ }
+
+ if (dist2 < (*best * *best)) *best = sqrt (dist2);
+ }
+
+ if (wind) {
+ /* Find wind */
+ if ((Ax >= Px) && (Bx >= Px)) return;
+ if ((Ay >= Py) && (By >= Py)) return;
+ if ((Ay < Py) && (By < Py)) return;
+ if (Ay == By) return;
+ /* Ctach upper y bound */
+ if (Ay == Py) {
+ if (Ax < Px) *wind -= 1;
+ return;
+ } else if (By == Py) {
+ if (Bx < Px) *wind += 1;
+ return;
+ } else {
+ Geom::Coord Qx;
+ /* Have to calculate intersection */
+ Qx = Ax + Dx * (Py - Ay) / Dy;
+ if (Qx < Px) {
+ *wind += (Dy > 0.0) ? 1 : -1;
+ }
+ }
+ }
+}
+
+static void
+geom_cubic_bbox_wind_distance (Geom::Coord x000, Geom::Coord y000,
+ Geom::Coord x001, Geom::Coord y001,
+ Geom::Coord x011, Geom::Coord y011,
+ Geom::Coord x111, Geom::Coord y111,
+ Geom::Point const &pt,
+ Geom::Rect *bbox, int *wind, Geom::Coord *best,
+ Geom::Coord tolerance)
+{
+ Geom::Coord x0, y0, x1, y1, len2;
+ int needdist, needwind;
+
+ const Geom::Coord Px = pt[X];
+ const Geom::Coord Py = pt[Y];
+
+ needdist = 0;
+ needwind = 0;
+
+ if (bbox) cubic_bbox (x000, y000, x001, y001, x011, y011, x111, y111, *bbox);
+
+ x0 = std::min (x000, x001);
+ x0 = std::min (x0, x011);
+ x0 = std::min (x0, x111);
+ y0 = std::min (y000, y001);
+ y0 = std::min (y0, y011);
+ y0 = std::min (y0, y111);
+ x1 = std::max (x000, x001);
+ x1 = std::max (x1, x011);
+ x1 = std::max (x1, x111);
+ y1 = std::max (y000, y001);
+ y1 = std::max (y1, y011);
+ y1 = std::max (y1, y111);
+
+ if (best) {
+ /* Quickly adjust to endpoints */
+ len2 = (x000 - Px) * (x000 - Px) + (y000 - Py) * (y000 - Py);
+ if (len2 < (*best * *best)) *best = (Geom::Coord) sqrt (len2);
+ len2 = (x111 - Px) * (x111 - Px) + (y111 - Py) * (y111 - Py);
+ if (len2 < (*best * *best)) *best = (Geom::Coord) sqrt (len2);
+
+ if (((x0 - Px) < *best) && ((y0 - Py) < *best) && ((Px - x1) < *best) && ((Py - y1) < *best)) {
+ /* Point is inside sloppy bbox */
+ /* Now we have to decide, whether subdivide */
+ /* fixme: (Lauris) */
+ if (((y1 - y0) > 5.0) || ((x1 - x0) > 5.0)) {
+ needdist = 1;
+ }
+ }
+ }
+ if (!needdist && wind) {
+ if ((y1 >= Py) && (y0 < Py) && (x0 < Px)) {
+ /* Possible intersection at the left */
+ /* Now we have to decide, whether subdivide */
+ /* fixme: (Lauris) */
+ if (((y1 - y0) > 5.0) || ((x1 - x0) > 5.0)) {
+ needwind = 1;
+ }
+ }
+ }
+
+ if (needdist || needwind) {
+ Geom::Coord x00t, x0tt, xttt, x1tt, x11t, x01t;
+ Geom::Coord y00t, y0tt, yttt, y1tt, y11t, y01t;
+ Geom::Coord s, t;
+
+ t = 0.5;
+ s = 1 - t;
+
+ x00t = s * x000 + t * x001;
+ x01t = s * x001 + t * x011;
+ x11t = s * x011 + t * x111;
+ x0tt = s * x00t + t * x01t;
+ x1tt = s * x01t + t * x11t;
+ xttt = s * x0tt + t * x1tt;
+
+ y00t = s * y000 + t * y001;
+ y01t = s * y001 + t * y011;
+ y11t = s * y011 + t * y111;
+ y0tt = s * y00t + t * y01t;
+ y1tt = s * y01t + t * y11t;
+ yttt = s * y0tt + t * y1tt;
+
+ geom_cubic_bbox_wind_distance (x000, y000, x00t, y00t, x0tt, y0tt, xttt, yttt, pt, nullptr, wind, best, tolerance);
+ geom_cubic_bbox_wind_distance (xttt, yttt, x1tt, y1tt, x11t, y11t, x111, y111, pt, nullptr, wind, best, tolerance);
+ } else {
+ geom_line_wind_distance (x000, y000, x111, y111, pt, wind, best);
+ }
+}
+
+static void
+geom_curve_bbox_wind_distance(Geom::Curve const & c, Geom::Affine const &m,
+ Geom::Point const &pt,
+ Geom::Rect *bbox, int *wind, Geom::Coord *dist,
+ Geom::Coord tolerance, Geom::Rect const *viewbox,
+ Geom::Point &p0) // pass p0 through as it represents the last endpoint added (the finalPoint of last curve)
+{
+ unsigned order = 0;
+ if (Geom::BezierCurve const* b = dynamic_cast<Geom::BezierCurve const*>(&c)) {
+ order = b->order();
+ }
+ if (order == 1) {
+ Geom::Point pe = c.finalPoint() * m;
+ if (bbox) {
+ bbox->expandTo(pe);
+ }
+ if (dist || wind) {
+ if (wind) { // we need to pick fill, so do what we're told
+ geom_line_wind_distance (p0[X], p0[Y], pe[X], pe[Y], pt, wind, dist);
+ } else { // only stroke is being picked; skip this segment if it's totally outside the viewbox
+ Geom::Rect swept(p0, pe);
+ if (!viewbox || swept.intersects(*viewbox))
+ geom_line_wind_distance (p0[X], p0[Y], pe[X], pe[Y], pt, wind, dist);
+ }
+ }
+ p0 = pe;
+ }
+ else if (order == 3) {
+ Geom::CubicBezier const& cubic_bezier = static_cast<Geom::CubicBezier const&>(c);
+ Geom::Point p1 = cubic_bezier[1] * m;
+ Geom::Point p2 = cubic_bezier[2] * m;
+ Geom::Point p3 = cubic_bezier[3] * m;
+
+ // get approximate bbox from handles (convex hull property of beziers):
+ Geom::Rect swept(p0, p3);
+ swept.expandTo(p1);
+ swept.expandTo(p2);
+
+ if (!viewbox || swept.intersects(*viewbox)) { // we see this segment, so do full processing
+ geom_cubic_bbox_wind_distance ( p0[X], p0[Y],
+ p1[X], p1[Y],
+ p2[X], p2[Y],
+ p3[X], p3[Y],
+ pt,
+ bbox, wind, dist, tolerance);
+ } else {
+ if (wind) { // if we need fill, we can just pretend it's a straight line
+ geom_line_wind_distance (p0[X], p0[Y], p3[X], p3[Y], pt, wind, dist);
+ } else { // otherwise, skip it completely
+ }
+ }
+ p0 = p3;
+ } else {
+ //this case handles sbasis as well as all other curve types
+ Geom::Path sbasis_path = Geom::cubicbezierpath_from_sbasis(c.toSBasis(), 0.1);
+
+ //recurse to convert the new path resulting from the sbasis to svgd
+ for (const auto & iter : sbasis_path) {
+ geom_curve_bbox_wind_distance(iter, m, pt, bbox, wind, dist, tolerance, viewbox, p0);
+ }
+ }
+}
+
+bool
+pointInTriangle(Geom::Point const &p, Geom::Point const &p1, Geom::Point const &p2, Geom::Point const &p3)
+{
+ //http://totologic.blogspot.com.es/2014/01/accurate-point-in-triangle-test.html
+ using Geom::X;
+ using Geom::Y;
+ double denominator = (p1[X]*(p2[Y] - p3[Y]) + p1[Y]*(p3[X] - p2[X]) + p2[X]*p3[Y] - p2[Y]*p3[X]);
+ double t1 = (p[X]*(p3[Y] - p1[Y]) + p[Y]*(p1[X] - p3[X]) - p1[X]*p3[Y] + p1[Y]*p3[X]) / denominator;
+ double t2 = (p[X]*(p2[Y] - p1[Y]) + p[Y]*(p1[X] - p2[X]) - p1[X]*p2[Y] + p1[Y]*p2[X]) / -denominator;
+ double s = t1 + t2;
+
+ return 0 <= t1 && t1 <= 1 && 0 <= t2 && t2 <= 1 && s <= 1;
+}
+
+
+/* Calculates...
+ and returns ... in *wind and the distance to ... in *dist.
+ Returns bounding box in *bbox if bbox!=NULL.
+ */
+void
+pathv_matrix_point_bbox_wind_distance (Geom::PathVector const & pathv, Geom::Affine const &m, Geom::Point const &pt,
+ Geom::Rect *bbox, int *wind, Geom::Coord *dist,
+ Geom::Coord tolerance, Geom::Rect const *viewbox)
+{
+ if (pathv.empty()) {
+ if (wind) *wind = 0;
+ if (dist) *dist = Geom::infinity();
+ return;
+ }
+
+ // remember last point of last curve
+ Geom::Point p0(0,0);
+
+ // remembering the start of subpath
+ Geom::Point p_start(0,0);
+ bool start_set = false;
+
+ for (const auto & it : pathv) {
+
+ if (start_set) { // this is a new subpath
+ if (wind && (p0 != p_start)) // for correct fill picking, each subpath must be closed
+ geom_line_wind_distance (p0[X], p0[Y], p_start[X], p_start[Y], pt, wind, dist);
+ }
+ p0 = it.initialPoint() * m;
+ p_start = p0;
+ start_set = true;
+ if (bbox) {
+ bbox->expandTo(p0);
+ }
+
+ // loop including closing segment if path is closed
+ for (Geom::Path::const_iterator cit = it.begin(); cit != it.end_default(); ++cit) {
+ geom_curve_bbox_wind_distance(*cit, m, pt, bbox, wind, dist, tolerance, viewbox, p0);
+ }
+ }
+
+ if (start_set) {
+ if (wind && (p0 != p_start)) // for correct picking, each subpath must be closed
+ geom_line_wind_distance (p0[X], p0[Y], p_start[X], p_start[Y], pt, wind, dist);
+ }
+}
+
+//#################################################################################
+
+/**
+ * Basic check on intersecting path vectors
+ */
+bool is_intersecting(Geom::PathVector const&a, Geom::PathVector const&b) {
+ for (auto &node : b.nodes()) {
+ if (a.winding(node)) {
+ return true;
+ }
+ }
+ for (auto &node : a.nodes()) {
+ if (b.winding(node)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/*
+ * Converts all segments in all paths to Geom::LineSegment or Geom::HLineSegment or
+ * Geom::VLineSegment or Geom::CubicBezier.
+ */
+Geom::PathVector
+pathv_to_linear_and_cubic_beziers( Geom::PathVector const &pathv )
+{
+ Geom::PathVector output;
+
+ for (const auto & pit : pathv) {
+ output.push_back( Geom::Path() );
+ output.back().setStitching(true);
+ output.back().start( pit.initialPoint() );
+
+ for (Geom::Path::const_iterator cit = pit.begin(); cit != pit.end_open(); ++cit) {
+ if (is_straight_curve(*cit)) {
+ Geom::LineSegment l(cit->initialPoint(), cit->finalPoint());
+ output.back().append(l);
+ } else {
+ Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&*cit);
+ if (curve && curve->order() == 3) {
+ Geom::CubicBezier b((*curve)[0], (*curve)[1], (*curve)[2], (*curve)[3]);
+ output.back().append(b);
+ } else {
+ // convert all other curve types to cubicbeziers
+ Geom::Path cubicbezier_path = Geom::cubicbezierpath_from_sbasis(cit->toSBasis(), 0.1);
+ cubicbezier_path.close(false);
+ output.back().append(cubicbezier_path);
+ }
+ }
+ }
+
+ output.back().close( pit.closed() );
+ }
+
+ return output;
+}
+
+/*
+ * Converts all segments in all paths to Geom::LineSegment. There is an intermediate
+ * stage where some may be converted to beziers. maxdisp is the maximum displacement from
+ * the line segment to the bezier curve; ** maxdisp is not used at this moment **.
+ *
+ * This is NOT a terribly fast method, but it should give a solution close to the one with the
+ * fewest points.
+ */
+Geom::PathVector
+pathv_to_linear( Geom::PathVector const &pathv, double /*maxdisp*/)
+{
+ Geom::PathVector output;
+ Geom::PathVector tmppath = pathv_to_linear_and_cubic_beziers(pathv);
+
+ // Now all path segments are either already lines, or they are beziers.
+
+ for (const auto & pit : tmppath) {
+ output.push_back( Geom::Path() );
+ output.back().start( pit.initialPoint() );
+ output.back().close( pit.closed() );
+
+ for (Geom::Path::const_iterator cit = pit.begin(); cit != pit.end_open(); ++cit) {
+ if (is_straight_curve(*cit)) {
+ Geom::LineSegment ls(cit->initialPoint(), cit->finalPoint());
+ output.back().append(ls);
+ }
+ else { /* all others must be Bezier curves */
+ Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&*cit);
+ std::vector<Geom::Point> bzrpoints = curve->controlPoints();
+ Geom::Point A = bzrpoints[0];
+ Geom::Point B = bzrpoints[1];
+ Geom::Point C = bzrpoints[2];
+ Geom::Point D = bzrpoints[3];
+ std::vector<Geom::Point> pointlist;
+ pointlist.push_back(A);
+ recursive_bezier4(
+ A[X], A[Y],
+ B[X], B[Y],
+ C[X], C[Y],
+ D[X], D[Y],
+ pointlist,
+ 0);
+ pointlist.push_back(D);
+ Geom::Point r1 = pointlist[0];
+ for (unsigned int i=1; i<pointlist.size();i++){
+ Geom::Point prev_r1 = r1;
+ r1 = pointlist[i];
+ Geom::LineSegment ls(prev_r1, r1);
+ output.back().append(ls);
+ }
+ pointlist.clear();
+ }
+ }
+ }
+
+ return output;
+}
+
+/*
+ * Converts all segments in all paths to Geom Cubic bezier.
+ * This is used in lattice2 LPE, maybe is better move the function to the effect
+ * But maybe could be usable by others, so i put here.
+ * The straight curve part is needed as is for the effect to work appropriately
+ */
+Geom::PathVector
+pathv_to_cubicbezier( Geom::PathVector const &pathv)
+{
+ Geom::PathVector output;
+ double cubicGap = 0.01;
+ for (const auto & pit : pathv) {
+ if (pit.empty()) {
+ continue;
+ }
+ output.push_back( Geom::Path() );
+ output.back().start( pit.initialPoint() );
+ output.back().close( pit.closed() );
+ bool end_open = false;
+ if (pit.closed()) {
+ const Geom::Curve &closingline = pit.back_closed();
+ if (!are_near(closingline.initialPoint(), closingline.finalPoint())) {
+ end_open = true;
+ }
+ }
+ Geom::Path pitCubic = (Geom::Path)pit;
+ if(end_open && pit.closed()){
+ pitCubic.close(false);
+ pitCubic.appendNew<Geom::LineSegment>( pitCubic.initialPoint() );
+ pitCubic.close(true);
+ }
+ for (Geom::Path::iterator cit = pitCubic.begin(); cit != pitCubic.end_open(); ++cit) {
+ if (is_straight_curve(*cit)) {
+ Geom::CubicBezier b(cit->initialPoint(), cit->pointAt(0.3334) + Geom::Point(cubicGap,cubicGap), cit->finalPoint(), cit->finalPoint());
+ output.back().append(b);
+ } else {
+ Geom::BezierCurve const *curve = dynamic_cast<Geom::BezierCurve const *>(&*cit);
+ if (curve && curve->order() == 3) {
+ Geom::CubicBezier b((*curve)[0], (*curve)[1], (*curve)[2], (*curve)[3]);
+ output.back().append(b);
+ } else {
+ // convert all other curve types to cubicbeziers
+ Geom::Path cubicbezier_path = Geom::cubicbezierpath_from_sbasis(cit->toSBasis(), 0.1);
+ output.back().append(cubicbezier_path);
+ }
+ }
+ }
+ }
+
+ return output;
+}
+
+//Study move to 2Geom
+size_t
+count_pathvector_nodes(Geom::PathVector const &pathv) {
+ size_t tot = 0;
+ for (auto subpath : pathv) {
+ tot += count_path_nodes(subpath);
+ }
+ return tot;
+}
+size_t count_path_nodes(Geom::Path const &path)
+{
+ size_t tot = path.size_closed();
+ if (path.closed()) {
+ const Geom::Curve &closingline = path.back_closed();
+ // the closing line segment is always of type
+ // Geom::LineSegment.
+ if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
+ // closingline.isDegenerate() did not work, because it only checks for
+ // *exact* zero length, which goes wrong for relative coordinates and
+ // rounding errors...
+ // the closing line segment has zero-length. So stop before that one!
+ tot -= 1;
+ }
+ }
+ return tot;
+}
+
+// The next routine is modified from curv4_div::recursive_bezier from file agg_curves.cpp
+//----------------------------------------------------------------------------
+// Anti-Grain Geometry (AGG) - Version 2.5
+// A high quality rendering engine for C++
+// Copyright (C) 2002-2006 Maxim Shemanarev
+// Contact: mcseem@antigrain.com
+// mcseemagg@yahoo.com
+// http://antigrain.com
+//
+// AGG is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// AGG is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with AGG; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+// MA 02110-1301, USA.
+//----------------------------------------------------------------------------
+void
+recursive_bezier4(const double x1, const double y1,
+ const double x2, const double y2,
+ const double x3, const double y3,
+ const double x4, const double y4,
+ std::vector<Geom::Point> &m_points,
+ int level)
+ {
+ // some of these should be parameters, but do it this way for now.
+ const double curve_collinearity_epsilon = 1e-30;
+ const double curve_angle_tolerance_epsilon = 0.01;
+ double m_cusp_limit = 0.0;
+ double m_angle_tolerance = 0.0;
+ double m_approximation_scale = 1.0;
+ double m_distance_tolerance_square = 0.5 / m_approximation_scale;
+ m_distance_tolerance_square *= m_distance_tolerance_square;
+ enum curve_recursion_limit_e { curve_recursion_limit = 32 };
+#define calc_sq_distance(A,B,C,D) ((A-C)*(A-C) + (B-D)*(B-D))
+
+ if(level > curve_recursion_limit)
+ {
+ return;
+ }
+
+
+ // Calculate all the mid-points of the line segments
+ //----------------------
+ double x12 = (x1 + x2) / 2;
+ double y12 = (y1 + y2) / 2;
+ double x23 = (x2 + x3) / 2;
+ double y23 = (y2 + y3) / 2;
+ double x34 = (x3 + x4) / 2;
+ double y34 = (y3 + y4) / 2;
+ double x123 = (x12 + x23) / 2;
+ double y123 = (y12 + y23) / 2;
+ double x234 = (x23 + x34) / 2;
+ double y234 = (y23 + y34) / 2;
+ double x1234 = (x123 + x234) / 2;
+ double y1234 = (y123 + y234) / 2;
+
+
+ // Try to approximate the full cubic curve by a single straight line
+ //------------------
+ double dx = x4-x1;
+ double dy = y4-y1;
+
+ double d2 = fabs(((x2 - x4) * dy - (y2 - y4) * dx));
+ double d3 = fabs(((x3 - x4) * dy - (y3 - y4) * dx));
+ double da1, da2, k;
+
+ switch((int(d2 > curve_collinearity_epsilon) << 1) +
+ int(d3 > curve_collinearity_epsilon))
+ {
+ case 0:
+ // All collinear OR p1==p4
+ //----------------------
+ k = dx*dx + dy*dy;
+ if(k == 0)
+ {
+ d2 = calc_sq_distance(x1, y1, x2, y2);
+ d3 = calc_sq_distance(x4, y4, x3, y3);
+ }
+ else
+ {
+ k = 1 / k;
+ da1 = x2 - x1;
+ da2 = y2 - y1;
+ d2 = k * (da1*dx + da2*dy);
+ da1 = x3 - x1;
+ da2 = y3 - y1;
+ d3 = k * (da1*dx + da2*dy);
+ if(d2 > 0 && d2 < 1 && d3 > 0 && d3 < 1)
+ {
+ // Simple collinear case, 1---2---3---4
+ // We can leave just two endpoints
+ return;
+ }
+ if(d2 <= 0) d2 = calc_sq_distance(x2, y2, x1, y1);
+ else if(d2 >= 1) d2 = calc_sq_distance(x2, y2, x4, y4);
+ else d2 = calc_sq_distance(x2, y2, x1 + d2*dx, y1 + d2*dy);
+
+ if(d3 <= 0) d3 = calc_sq_distance(x3, y3, x1, y1);
+ else if(d3 >= 1) d3 = calc_sq_distance(x3, y3, x4, y4);
+ else d3 = calc_sq_distance(x3, y3, x1 + d3*dx, y1 + d3*dy);
+ }
+ if(d2 > d3)
+ {
+ if(d2 < m_distance_tolerance_square)
+ {
+ m_points.emplace_back(x2, y2);
+ return;
+ }
+ }
+ else
+ {
+ if(d3 < m_distance_tolerance_square)
+ {
+ m_points.emplace_back(x3, y3);
+ return;
+ }
+ }
+ break;
+
+ case 1:
+ // p1,p2,p4 are collinear, p3 is significant
+ //----------------------
+ if(d3 * d3 <= m_distance_tolerance_square * (dx*dx + dy*dy))
+ {
+ if(m_angle_tolerance < curve_angle_tolerance_epsilon)
+ {
+ m_points.emplace_back(x23, y23);
+ return;
+ }
+
+ // Angle Condition
+ //----------------------
+ da1 = fabs(atan2(y4 - y3, x4 - x3) - atan2(y3 - y2, x3 - x2));
+ if(da1 >= M_PI) da1 = 2*M_PI - da1;
+
+ if(da1 < m_angle_tolerance)
+ {
+ m_points.emplace_back(x2, y2);
+ m_points.emplace_back(x3, y3);
+ return;
+ }
+
+ if(m_cusp_limit != 0.0)
+ {
+ if(da1 > m_cusp_limit)
+ {
+ m_points.emplace_back(x3, y3);
+ return;
+ }
+ }
+ }
+ break;
+
+ case 2:
+ // p1,p3,p4 are collinear, p2 is significant
+ //----------------------
+ if(d2 * d2 <= m_distance_tolerance_square * (dx*dx + dy*dy))
+ {
+ if(m_angle_tolerance < curve_angle_tolerance_epsilon)
+ {
+ m_points.emplace_back(x23, y23);
+ return;
+ }
+
+ // Angle Condition
+ //----------------------
+ da1 = fabs(atan2(y3 - y2, x3 - x2) - atan2(y2 - y1, x2 - x1));
+ if(da1 >= M_PI) da1 = 2*M_PI - da1;
+
+ if(da1 < m_angle_tolerance)
+ {
+ m_points.emplace_back(x2, y2);
+ m_points.emplace_back(x3, y3);
+ return;
+ }
+
+ if(m_cusp_limit != 0.0)
+ {
+ if(da1 > m_cusp_limit)
+ {
+ m_points.emplace_back(x2, y2);
+ return;
+ }
+ }
+ }
+ break;
+
+ case 3:
+ // Regular case
+ //-----------------
+ if((d2 + d3)*(d2 + d3) <= m_distance_tolerance_square * (dx*dx + dy*dy))
+ {
+ // If the curvature doesn't exceed the distance_tolerance value
+ // we tend to finish subdivisions.
+ //----------------------
+ if(m_angle_tolerance < curve_angle_tolerance_epsilon)
+ {
+ m_points.emplace_back(x23, y23);
+ return;
+ }
+
+ // Angle & Cusp Condition
+ //----------------------
+ k = atan2(y3 - y2, x3 - x2);
+ da1 = fabs(k - atan2(y2 - y1, x2 - x1));
+ da2 = fabs(atan2(y4 - y3, x4 - x3) - k);
+ if(da1 >= M_PI) da1 = 2*M_PI - da1;
+ if(da2 >= M_PI) da2 = 2*M_PI - da2;
+
+ if(da1 + da2 < m_angle_tolerance)
+ {
+ // Finally we can stop the recursion
+ //----------------------
+ m_points.emplace_back(x23, y23);
+ return;
+ }
+
+ if(m_cusp_limit != 0.0)
+ {
+ if(da1 > m_cusp_limit)
+ {
+ m_points.emplace_back(x2, y2);
+ return;
+ }
+
+ if(da2 > m_cusp_limit)
+ {
+ m_points.emplace_back(x3, y3);
+ return;
+ }
+ }
+ }
+ break;
+ }
+
+ // Continue subdivision
+ //----------------------
+ recursive_bezier4(x1, y1, x12, y12, x123, y123, x1234, y1234, m_points, level + 1);
+ recursive_bezier4(x1234, y1234, x234, y234, x34, y34, x4, y4, m_points, level + 1);
+}
+
+void
+swap(Geom::Point &A, Geom::Point &B){
+ Geom::Point tmp = A;
+ A = B;
+ B = tmp;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/geom.h b/src/helper/geom.h
new file mode 100644
index 0000000..ba12404
--- /dev/null
+++ b/src/helper/geom.h
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_HELPER_GEOM_H
+#define INKSCAPE_HELPER_GEOM_H
+
+/**
+ * @file
+ * Specific geometry functions for Inkscape, not provided my lib2geom.
+ */
+/*
+ * Author:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/forward.h>
+#include <2geom/rect.h>
+#include <2geom/affine.h>
+
+Geom::OptRect bounds_fast_transformed(Geom::PathVector const & pv, Geom::Affine const & t);
+Geom::OptRect bounds_exact_transformed(Geom::PathVector const & pv, Geom::Affine const & t);
+
+void pathv_matrix_point_bbox_wind_distance ( Geom::PathVector const & pathv, Geom::Affine const &m, Geom::Point const &pt,
+ Geom::Rect *bbox, int *wind, Geom::Coord *dist,
+ Geom::Coord tolerance, Geom::Rect const *viewbox);
+
+bool is_intersecting(Geom::PathVector const&a, Geom::PathVector const&b);
+
+size_t count_pathvector_nodes(Geom::PathVector const &pathv );
+size_t count_path_nodes(Geom::Path const &path);
+bool pointInTriangle(Geom::Point const &p, Geom::Point const &p1, Geom::Point const &p2, Geom::Point const &p3);
+Geom::PathVector pathv_to_linear_and_cubic_beziers( Geom::PathVector const &pathv );
+Geom::PathVector pathv_to_linear( Geom::PathVector const &pathv, double maxdisp );
+Geom::PathVector pathv_to_cubicbezier( Geom::PathVector const &pathv);
+bool pathv_similar(Geom::PathVector const &apv, Geom::PathVector const &bpv, double precission = 0.001);
+void recursive_bezier4(const double x1, const double y1, const double x2, const double y2,
+ const double x3, const double y3, const double x4, const double y4,
+ std::vector<Geom::Point> &pointlist,
+ int level);
+void swap(Geom::Point &A, Geom::Point &B);
+#endif // INKSCAPE_HELPER_GEOM_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/gettext.cpp b/src/helper/gettext.cpp
new file mode 100644
index 0000000..d3f8cc2
--- /dev/null
+++ b/src/helper/gettext.cpp
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * helper functions for gettext
+ *//*
+ * Authors:
+ * see git history
+ * Patrick Storz <eduard.braun2@gmx.de>
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h" // only include where actually required!
+#endif
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "path-prefix.h"
+
+#include <string>
+#include <glibmm.h>
+#include <glibmm/i18n.h>
+
+namespace Inkscape {
+
+/** does all required gettext initialization and takes care of the respective locale directory paths */
+void initialize_gettext() {
+ auto localepath = Glib::getenv("INKSCAPE_LOCALEDIR");
+
+ if (localepath.empty()) {
+ localepath = Glib::build_filename(Glib::path_get_dirname(get_inkscape_datadir()), PACKAGE_LOCALE_DIR);
+ }
+
+ if (!Glib::file_test(localepath, Glib::FILE_TEST_IS_DIR)) {
+ localepath = PACKAGE_LOCALE_DIR_ABSOLUTE;
+ }
+
+#ifdef _WIN32
+ // obtain short path, bindtextdomain doesn't understand UTF-8
+ auto shortlocalepath = g_win32_locale_filename_from_utf8(localepath.c_str());
+ localepath = shortlocalepath;
+ g_free(shortlocalepath);
+#endif
+
+ bindtextdomain(GETTEXT_PACKAGE, localepath.c_str());
+
+ // common setup
+ bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
+ textdomain(GETTEXT_PACKAGE);
+}
+
+/** set gettext codeset to UTF8 */
+void bind_textdomain_codeset_utf8() {
+ bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
+}
+
+/** set gettext codeset to codeset of the system console
+ * - on *nix this is typically the current locale,
+ * - on Windows we don't care and simply use UTF8
+ * any conversion would need to happen in our console wrappers (see winconsole.cpp) anyway
+ * as we have no easy way of determining console encoding from inkscape/inkview.exe process;
+ * for now do something even easier - switch console encoding to UTF8 and be done with it!
+ * this also works nicely on MSYS consoles where UTF8 encoding is used by default, too */
+void bind_textdomain_codeset_console() {
+#ifdef _WIN32
+ bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
+#else
+ std::string charset;
+ Glib::get_charset(charset);
+ bind_textdomain_codeset(GETTEXT_PACKAGE, charset.c_str());
+#endif
+}
+
+}
+
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace .0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
diff --git a/src/helper/gettext.h b/src/helper/gettext.h
new file mode 100644
index 0000000..e5745ee
--- /dev/null
+++ b/src/helper/gettext.h
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * \brief helper functions for gettext
+ *//*
+ * Authors:
+ * see git history
+ * Patrick Storz <eduard.braun2@gmx.de>
+ *
+ * Copyright (C) 2017 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_GETTEXT_HELPER_H
+#define SEEN_GETTEXT_HELPER_H
+
+namespace Inkscape {
+ void initialize_gettext();
+ void bind_textdomain_codeset_utf8();
+ void bind_textdomain_codeset_console();
+}
+
+#endif // SEEN_GETTEXT_HELPER_H
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace .0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99:
diff --git a/src/helper/mathfns.h b/src/helper/mathfns.h
new file mode 100644
index 0000000..e0e321c
--- /dev/null
+++ b/src/helper/mathfns.h
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ... some mathematical functions
+ *
+ * Authors:
+ * Johan Engelen <goejendaagh@zonnet.nl>
+ *
+ * Copyright (C) 2007 Johan Engelen
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_UTIL_MATHFNS_H
+#define SEEN_INKSCAPE_UTIL_MATHFNS_H
+
+#include <2geom/point.h>
+
+namespace Inkscape {
+
+namespace Util {
+
+/**
+ * Returns area in triangle given by points; may be negative.
+ */
+inline double
+triangle_area (Geom::Point p1, Geom::Point p2, Geom::Point p3)
+{
+ using Geom::X;
+ using Geom::Y;
+ return (p1[X]*p2[Y] + p1[Y]*p3[X] + p2[X]*p3[Y] - p2[Y]*p3[X] - p1[Y]*p2[X] - p1[X]*p3[Y]);
+}
+
+/**
+ * \return x rounded to the nearest multiple of c1 plus c0.
+ *
+ * \note
+ * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
+ * mean "ignore the grid in this dimension".
+ */
+inline double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
+{
+ return floor((x - c0) / c1 + .5) * c1 + c0;
+}
+
+/**
+ * \return x rounded to the lower multiple of c1 plus c0.
+ *
+ * \note
+ * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
+ * mean "ignore the grid in this dimension".
+ */
+inline double round_to_lower_multiple_plus(double x, double const c1, double const c0 = 0)
+{
+ return floor((x - c0) / c1) * c1 + c0;
+}
+
+/**
+ * \return x rounded to the upper multiple of c1 plus c0.
+ *
+ * \note
+ * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
+ * mean "ignore the grid in this dimension".
+ */
+inline double round_to_upper_multiple_plus(double x, double const c1, double const c0 = 0)
+{
+ return ceil((x - c0) / c1) * c1 + c0;
+}
+
+}
+
+}
+
+#endif
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/pixbuf-ops.cpp b/src/helper/pixbuf-ops.cpp
new file mode 100644
index 0000000..dbe9ff6
--- /dev/null
+++ b/src/helper/pixbuf-ops.cpp
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Helpers for SPItem -> gdk_pixbuf related stuff
+ *
+ * Authors:
+ * John Cliff <simarilius@yahoo.com>
+ * Jon A. Cruz <jon@joncruz.org>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 2008 John Cliff
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <2geom/transforms.h>
+
+#include "helper/png-write.h"
+#include "display/cairo-utils.h"
+#include "display/drawing.h"
+#include "display/drawing-context.h"
+#include "document.h"
+#include "object/sp-root.h"
+#include "object/sp-defs.h"
+#include "object/sp-use.h"
+#include "util/units.h"
+#include "inkscape.h"
+
+#include "helper/pixbuf-ops.h"
+
+#include <gdk/gdk.h>
+
+// TODO look for copy-n-paste duplication of this function:
+/**
+ * Hide all items that are not in list, recursively, skipping groups and defs.
+ */
+static void hide_other_items_recursively(SPObject *object, const std::vector<SPItem*> &items, unsigned dkey)
+{
+ SPItem *item = dynamic_cast<SPItem *>(object);
+ if (!item) {
+ // <defs>, <metadata>, etc.
+ return;
+ }
+
+ if (std::find (items.begin(), items.end(), item) != items.end()) {
+ // It's in our list, don't hide!
+ return;
+ }
+
+ if ( !dynamic_cast<SPRoot *>(item) &&
+ !dynamic_cast<SPGroup *>(item) &&
+ !dynamic_cast<SPUse *>(item) ) {
+ // Hide if not container or def.
+ item->invoke_hide(dkey);
+ }
+
+ for (auto& child: object->children) {
+ hide_other_items_recursively(&child, items, dkey);
+ }
+}
+
+
+/**
+ generates a bitmap from given items
+ the bitmap is stored in RAM and not written to file
+ @param document Inkscape document.
+ @param area Export area in document units.
+ @param dpi Resolution.
+ @param items Vector of pointers to SPItems to export. Export all items if empty.
+ @param opaque Set items opacity to 1 (used by Cairo renderer for filtered objects rendered as bitmaps).
+ @return The created GdkPixbuf structure or nullptr if rendering failed.
+*/
+Inkscape::Pixbuf *sp_generate_internal_bitmap(SPDocument *document,
+ Geom::Rect const &area,
+ double dpi,
+ std::vector<SPItem *> items,
+ bool opaque)
+{
+ // Geometry
+ if (area.hasZeroArea()) {
+ return nullptr;
+ }
+
+ Geom::Point origin = area.min();
+ double scale_factor = Inkscape::Util::Quantity::convert(dpi, "px", "in");
+ Geom::Affine affine = Geom::Translate(-origin) * Geom::Scale (scale_factor, scale_factor);
+
+ int width = std::ceil(scale_factor * area.width());
+ int height = std::ceil(scale_factor * area.height());
+
+ // Document
+ document->ensureUpToDate();
+ unsigned dkey = SPItem::display_key_new(1);
+
+ // Drawing
+ Inkscape::Drawing drawing; // New drawing for offscreen rendering.
+ drawing.setExact(true); // Maximum quality for blurs.
+
+ /* Create ArenaItems and set transform */
+ Inkscape::DrawingItem *root = document->getRoot()->invoke_show( drawing, dkey, SP_ITEM_SHOW_DISPLAY);
+ root->setTransform(affine);
+ drawing.setRoot(root);
+
+ // Hide all items we don't want, instead of showing only requested items,
+ // because that would not work if the shown item references something in defs.
+ if (!items.empty()) {
+ hide_other_items_recursively(document->getRoot(), items, dkey);
+ }
+
+ Geom::IntRect final_area = Geom::IntRect::from_xywh(0, 0, width, height);
+ drawing.update(final_area);
+
+ if (opaque) {
+ // Required by sp_asbitmap_render().
+ for (auto item : items) {
+ if (item->get_arenaitem(dkey)) {
+ item->get_arenaitem(dkey)->setOpacity(1.0);
+ }
+ }
+ }
+
+ // Rendering
+ cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+ Inkscape::Pixbuf* pixbuf = nullptr;
+
+ if (cairo_surface_status(surface) == CAIRO_STATUS_SUCCESS) {
+ Inkscape::DrawingContext dc(surface, Geom::Point(0,0));
+
+ // render items
+ drawing.render(dc, final_area, Inkscape::DrawingItem::RENDER_BYPASS_CACHE);
+
+ pixbuf = new Inkscape::Pixbuf(surface);
+
+ } else {
+
+ long long size =
+ (long long) height *
+ (long long) cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
+ g_warning("sp_generate_internal_bitmap: not enough memory to create pixel buffer. Need %lld.", size);
+ cairo_surface_destroy(surface);
+ }
+
+ // Return to previous state.
+ document->getRoot()->invoke_hide(dkey);
+
+ return pixbuf;
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/pixbuf-ops.h b/src/helper/pixbuf-ops.h
new file mode 100644
index 0000000..91cd73b
--- /dev/null
+++ b/src/helper/pixbuf-ops.h
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef __SP_PIXBUF_OPS_H__
+#define __SP_PIXBUF_OPS_H__
+
+/*
+ * Helpers for SPItem -> gdk_pixbuf related stuff
+ *
+ * Authors:
+ * John Cliff <simarilius@yahoo.com>
+ *
+ * Copyright (C) 2008 John Cliff
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glib.h>
+
+class SPDocument;
+class SPItem;
+namespace Inkscape { class Pixbuf; }
+
+Inkscape::Pixbuf *sp_generate_internal_bitmap(SPDocument *document,
+ Geom::Rect const &area,
+ double dpi,
+ std::vector<SPItem *> items = std::vector<SPItem*>(),
+ bool set_opaque = false);
+#endif
diff --git a/src/helper/png-write.cpp b/src/helper/png-write.cpp
new file mode 100644
index 0000000..88ca1a5
--- /dev/null
+++ b/src/helper/png-write.cpp
@@ -0,0 +1,508 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PNG file format utilities
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Whoever wrote this example in libpng documentation
+ * Peter Bostrom
+ * Jon A. Cruz <jon@joncruz.org>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 1999-2002 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#include <2geom/rect.h>
+#include <2geom/transforms.h>
+
+#include <png.h>
+
+#include "document.h"
+#include "inkscape.h"
+#include "png-write.h"
+#include "preferences.h"
+#include "rdf.h"
+
+#include "display/cairo-utils.h"
+#include "display/drawing-context.h"
+#include "display/drawing.h"
+
+#include "io/sys.h"
+
+#include "object/sp-defs.h"
+#include "object/sp-item.h"
+#include "object/sp-root.h"
+
+#include "ui/interface.h"
+#include "util/units.h"
+
+/* This is an example of how to use libpng to read and write PNG files.
+ * The file libpng.txt is much more verbose then this. If you have not
+ * read it, do so first. This was designed to be a starting point of an
+ * implementation. This is not officially part of libpng, and therefore
+ * does not require a copyright notice.
+ *
+ * This file does not currently compile, because it is missing certain
+ * parts, like allocating memory to hold an image. You will have to
+ * supply these parts to get it to compile. For an example of a minimal
+ * working PNG reader/writer, see pngtest.c, included in this distribution.
+ */
+
+struct SPEBP {
+ unsigned long int width, height, sheight;
+ guint32 background;
+ Inkscape::Drawing *drawing; // it is assumed that all unneeded items are hidden
+ guchar *px;
+ unsigned (*status)(float, void *);
+ void *data;
+};
+
+/* write a png file */
+
+struct SPPNGBD {
+ guchar const *px;
+ int rowstride;
+};
+
+/**
+ * A simple wrapper to list png_text.
+ */
+class PngTextList {
+public:
+ PngTextList() : count(0), textItems(nullptr) {}
+ ~PngTextList();
+
+ void add(gchar const* key, gchar const* text);
+ gint getCount() {return count;}
+ png_text* getPtext() {return textItems;}
+
+private:
+ gint count;
+ png_text* textItems;
+};
+
+PngTextList::~PngTextList() {
+ for (gint i = 0; i < count; i++) {
+ if (textItems[i].key) {
+ g_free(textItems[i].key);
+ }
+ if (textItems[i].text) {
+ g_free(textItems[i].text);
+ }
+ }
+}
+
+void PngTextList::add(gchar const* key, gchar const* text)
+{
+ if (count < 0) {
+ count = 0;
+ textItems = nullptr;
+ }
+ png_text* tmp = (count > 0) ? g_try_renew(png_text, textItems, count + 1): g_try_new(png_text, 1);
+ if (tmp) {
+ textItems = tmp;
+ count++;
+
+ png_text* item = &(textItems[count - 1]);
+ item->compression = PNG_TEXT_COMPRESSION_NONE;
+ item->key = g_strdup(key);
+ item->text = g_strdup(text);
+ item->text_length = 0;
+#ifdef PNG_iTXt_SUPPORTED
+ item->itxt_length = 0;
+ item->lang = nullptr;
+ item->lang_key = nullptr;
+#endif // PNG_iTXt_SUPPORTED
+ } else {
+ g_warning("Unable to allocate array for %d PNG text data.", count);
+ textItems = nullptr;
+ count = 0;
+ }
+}
+
+static bool
+sp_png_write_rgba_striped(SPDocument *doc,
+ gchar const *filename, unsigned long int width, unsigned long int height, double xdpi, double ydpi,
+ int (* get_rows)(guchar const **rows, void **to_free, int row, int num_rows, void *data, int color_type, int bit_depth, int antialias),
+ void *data, bool interlace, int color_type, int bit_depth, int zlib, int antialiasing)
+{
+ g_return_val_if_fail(filename != nullptr, false);
+ g_return_val_if_fail(data != nullptr, false);
+
+ struct SPEBP *ebp = (struct SPEBP *) data;
+ FILE *fp;
+ png_structp png_ptr;
+ png_infop info_ptr;
+ png_color_8 sig_bit;
+ png_uint_32 r;
+
+ /* open the file */
+
+ Inkscape::IO::dump_fopen_call(filename, "M");
+ fp = Inkscape::IO::fopen_utf8name(filename, "wb");
+ if(fp == nullptr) return false;
+
+ /* Create and initialize the png_struct with the desired error handler
+ * functions. If you want to use the default stderr and longjump method,
+ * you can supply NULL for the last three parameters. We also check that
+ * the library version is compatible with the one used at compile time,
+ * in case we are using dynamically linked libraries. REQUIRED.
+ */
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
+
+ if (png_ptr == nullptr) {
+ fclose(fp);
+ return false;
+ }
+
+ /* Allocate/initialize the image information data. REQUIRED */
+ info_ptr = png_create_info_struct(png_ptr);
+ if (info_ptr == nullptr) {
+ fclose(fp);
+ png_destroy_write_struct(&png_ptr, nullptr);
+ return false;
+ }
+
+ /* Set error handling. REQUIRED if you aren't supplying your own
+ * error handling functions in the png_create_write_struct() call.
+ */
+ if (setjmp(png_jmpbuf(png_ptr))) {
+ // If we get here, we had a problem reading the file
+ fclose(fp);
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ return false;
+ }
+
+ /* set up the output control if you are using standard C streams */
+ png_init_io(png_ptr, fp);
+
+ /* Set the image information here. Width and height are up to 2^31,
+ * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
+ * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
+ * PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
+ * or PNG_COLOR_TYPE_RGB_ALPHA. interlace is either PNG_INTERLACE_NONE or
+ * PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
+ * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
+ */
+
+ png_set_compression_level(png_ptr, zlib);
+
+ png_set_IHDR(png_ptr, info_ptr,
+ width,
+ height,
+ bit_depth,
+ color_type,
+ interlace ? PNG_INTERLACE_ADAM7 : PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_BASE,
+ PNG_FILTER_TYPE_BASE);
+
+ if ((color_type&2) && bit_depth == 16) {
+ // otherwise, if we are dealing with a color image then
+ sig_bit.red = 8;
+ sig_bit.green = 8;
+ sig_bit.blue = 8;
+ // if the image has an alpha channel then
+ if (color_type&4)
+ sig_bit.alpha = 8;
+ png_set_sBIT(png_ptr, info_ptr, &sig_bit);
+ }
+
+ PngTextList textList;
+
+ textList.add("Software", "www.inkscape.org"); // Made by Inkscape comment
+ {
+ const gchar* pngToDc[] = {"Title", "title",
+ "Author", "creator",
+ "Description", "description",
+ //"Copyright", "",
+ "Creation Time", "date",
+ //"Disclaimer", "",
+ //"Warning", "",
+ "Source", "source"
+ //"Comment", ""
+ };
+ for (size_t i = 0; i < G_N_ELEMENTS(pngToDc); i += 2) {
+ struct rdf_work_entity_t * entity = rdf_find_entity ( pngToDc[i + 1] );
+ if (entity) {
+ gchar const* data = rdf_get_work_entity(doc, entity);
+ if (data && *data) {
+ textList.add(pngToDc[i], data);
+ }
+ } else {
+ g_warning("Unable to find entity [%s]", pngToDc[i + 1]);
+ }
+ }
+
+
+ struct rdf_license_t *license = rdf_get_license(doc);
+ if (license) {
+ if (license->name && license->uri) {
+ gchar* tmp = g_strdup_printf("%s %s", license->name, license->uri);
+ textList.add("Copyright", tmp);
+ g_free(tmp);
+ } else if (license->name) {
+ textList.add("Copyright", license->name);
+ } else if (license->uri) {
+ textList.add("Copyright", license->uri);
+ }
+ }
+ }
+ if (textList.getCount() > 0) {
+ png_set_text(png_ptr, info_ptr, textList.getPtext(), textList.getCount());
+ }
+
+ /* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
+ /* note that if sRGB is present the cHRM chunk must be ignored
+ * on read and must be written in accordance with the sRGB profile */
+ if(xdpi < 0.0254 ) xdpi = 0.0255;
+ if(ydpi < 0.0254 ) ydpi = 0.0255;
+
+ png_set_pHYs(png_ptr, info_ptr, unsigned(xdpi / 0.0254 ), unsigned(ydpi / 0.0254 ), PNG_RESOLUTION_METER);
+
+ /* Write the file header information. REQUIRED */
+ png_write_info(png_ptr, info_ptr);
+
+ /* Once we write out the header, the compression type on the text
+ * chunks gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
+ * PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
+ * at the end.
+ */
+
+ /* set up the transformations you want. Note that these are
+ * all optional. Only call them if you want them.
+ */
+
+ /* --- CUT --- */
+
+ /* The easiest way to write the image (you may have a different memory
+ * layout, however, so choose what fits your needs best). You need to
+ * use the first method if you aren't handling interlacing yourself.
+ */
+
+ png_bytep* row_pointers = new png_bytep[ebp->sheight];
+ int number_of_passes = interlace ? png_set_interlace_handling(png_ptr) : 1;
+
+ for(int i=0;i<number_of_passes; ++i){
+ r = 0;
+ while (r < static_cast<png_uint_32>(height)) {
+ void *to_free;
+ int n = get_rows((unsigned char const **) row_pointers, &to_free, r, height-r, data, color_type, bit_depth, antialiasing);
+ if (!n) break;
+ png_write_rows(png_ptr, row_pointers, n);
+ g_free(to_free);
+ r += n;
+ }
+ }
+
+ delete[] row_pointers;
+
+ /* You can write optional chunks like tEXt, zTXt, and tIME at the end
+ * as well.
+ */
+
+ /* It is REQUIRED to call this to finish writing the rest of the file */
+ png_write_end(png_ptr, info_ptr);
+
+ /* if you allocated any text comments, free them here */
+
+ /* clean up after the write, and free any memory allocated */
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+
+ /* close the file */
+ fclose(fp);
+
+ /* that's it */
+ return true;
+}
+
+
+/**
+ *
+ */
+static int
+sp_export_get_rows(guchar const **rows, void **to_free, int row, int num_rows, void *data, int color_type, int bit_depth, int antialiasing)
+{
+ struct SPEBP *ebp = (struct SPEBP *) data;
+
+ if (ebp->status) {
+ if (!ebp->status((float) row / ebp->height, ebp->data)) return 0;
+ }
+
+ num_rows = MIN(num_rows, static_cast<int>(ebp->sheight));
+ num_rows = MIN(num_rows, static_cast<int>(ebp->height - row));
+
+ /* Set area of interest */
+ // bbox is now set to the entire image to prevent discontinuities
+ // in the image when blur is used (the borders may still be a bit
+ // off, but that's less noticeable).
+ Geom::IntRect bbox = Geom::IntRect::from_xywh(0, row, ebp->width, num_rows);
+
+ /* Update to renderable state */
+ ebp->drawing->update(bbox);
+
+ int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, ebp->width);
+ unsigned char *px = g_new(guchar, num_rows * stride);
+
+ cairo_surface_t *s = cairo_image_surface_create_for_data(
+ px, CAIRO_FORMAT_ARGB32, ebp->width, num_rows, stride);
+ Inkscape::DrawingContext dc(s, bbox.min());
+ dc.setSource(ebp->background);
+ dc.setOperator(CAIRO_OPERATOR_SOURCE);
+ dc.paint();
+ dc.setOperator(CAIRO_OPERATOR_OVER);
+
+ /* Render */
+ ebp->drawing->render(dc, bbox, 0, antialiasing);
+ cairo_surface_destroy(s);
+
+ // PNG stores data as unpremultiplied big-endian RGBA, which means
+ // it's identical to the GdkPixbuf format.
+ convert_pixels_argb32_to_pixbuf(px, ebp->width, num_rows, stride,
+ /* RGBA to ARGB with A=0 */ ebp->background >> 8);
+
+ // If a custom bit depth or color type is asked, then convert rgb to grayscale, etc.
+ const guchar* new_data = pixbuf_to_png(rows, px, num_rows, ebp->width, stride, color_type, bit_depth);
+ *to_free = (void*) new_data;
+ free(px);
+
+ return num_rows;
+}
+
+/**
+ * Hide all items that are not listed in list, recursively, skipping groups and defs.
+ */
+static void hide_other_items_recursively(SPObject *o, const std::vector<SPItem*> &list, unsigned dkey)
+{
+ if ( SP_IS_ITEM(o)
+ && !SP_IS_DEFS(o)
+ && !SP_IS_ROOT(o)
+ && !SP_IS_GROUP(o)
+ && list.end()==find(list.begin(),list.end(),o))
+ {
+ SP_ITEM(o)->invoke_hide(dkey);
+ }
+
+ // recurse
+ if (list.end()==find(list.begin(),list.end(),o)) {
+ for (auto& child: o->children) {
+ hide_other_items_recursively(&child, list, dkey);
+ }
+ }
+}
+
+
+ExportResult sp_export_png_file(SPDocument *doc, gchar const *filename,
+ double x0, double y0, double x1, double y1,
+ unsigned long int width, unsigned long int height, double xdpi, double ydpi,
+ unsigned long bgcolor,
+ unsigned int (*status) (float, void *),
+ void *data, bool force_overwrite,
+ const std::vector<SPItem*> &items_only, bool interlace, int color_type, int bit_depth, int zlib, int antialiasing)
+{
+ return sp_export_png_file(doc, filename, Geom::Rect(Geom::Point(x0,y0),Geom::Point(x1,y1)),
+ width, height, xdpi, ydpi, bgcolor, status, data, force_overwrite, items_only, interlace, color_type, bit_depth, zlib, antialiasing);
+}
+
+/**
+ * Export an area to a PNG file
+ *
+ * @param area Area in document coordinates
+ */
+ExportResult sp_export_png_file(SPDocument *doc, gchar const *filename,
+ Geom::Rect const &area,
+ unsigned long width, unsigned long height, double xdpi, double ydpi,
+ unsigned long bgcolor,
+ unsigned (*status)(float, void *),
+ void *data, bool force_overwrite,
+ const std::vector<SPItem*> &items_only, bool interlace, int color_type, int bit_depth, int zlib, int antialiasing)
+{
+ g_return_val_if_fail(doc != nullptr, EXPORT_ERROR);
+ g_return_val_if_fail(filename != nullptr, EXPORT_ERROR);
+ g_return_val_if_fail(width >= 1, EXPORT_ERROR);
+ g_return_val_if_fail(height >= 1, EXPORT_ERROR);
+ g_return_val_if_fail(!area.hasZeroArea(), EXPORT_ERROR);
+
+ if (!force_overwrite && !sp_ui_overwrite_file(filename)) {
+ // aborted overwrite
+ return EXPORT_ABORTED;
+ }
+
+ doc->ensureUpToDate();
+
+ /* Calculate translation by transforming to document coordinates (flipping Y)*/
+ Geom::Point translation = -area.min();
+
+ /* This calculation is only valid when assumed that (x0,y0)= area.corner(0) and (x1,y1) = area.corner(2)
+ * 1) a[0] * x0 + a[2] * y1 + a[4] = 0.0
+ * 2) a[1] * x0 + a[3] * y1 + a[5] = 0.0
+ * 3) a[0] * x1 + a[2] * y1 + a[4] = width
+ * 4) a[1] * x0 + a[3] * y0 + a[5] = height
+ * 5) a[1] = 0.0;
+ * 6) a[2] = 0.0;
+ *
+ * (1,3) a[0] * x1 - a[0] * x0 = width
+ * a[0] = width / (x1 - x0)
+ * (2,4) a[3] * y0 - a[3] * y1 = height
+ * a[3] = height / (y0 - y1)
+ * (1) a[4] = -a[0] * x0
+ * (2) a[5] = -a[3] * y1
+ */
+
+ Geom::Affine const affine(Geom::Translate(translation)
+ * Geom::Scale(width / area.width(),
+ height / area.height()));
+
+ struct SPEBP ebp;
+ ebp.width = width;
+ ebp.height = height;
+ ebp.background = bgcolor;
+
+ /* Create new drawing */
+ Inkscape::Drawing drawing;
+ drawing.setExact(true); // export with maximum blur rendering quality
+ unsigned const dkey = SPItem::display_key_new(1);
+
+ // Create ArenaItems and set transform
+ drawing.setRoot(doc->getRoot()->invoke_show(drawing, dkey, SP_ITEM_SHOW_DISPLAY));
+ drawing.root()->setTransform(affine);
+ ebp.drawing = &drawing;
+
+ // We show all and then hide all items we don't want, instead of showing only requested items,
+ // because that would not work if the shown item references something in defs
+ if (!items_only.empty()) {
+ hide_other_items_recursively(doc->getRoot(), items_only, dkey);
+ }
+
+ ebp.status = status;
+ ebp.data = data;
+
+ bool write_status = false;;
+
+ ebp.sheight = 64;
+ ebp.px = g_try_new(guchar, 4 * ebp.sheight * width);
+
+ if (ebp.px) {
+ write_status = sp_png_write_rgba_striped(doc, filename, width, height, xdpi, ydpi, sp_export_get_rows, &ebp, interlace, color_type, bit_depth, zlib, antialiasing);
+ g_free(ebp.px);
+ }
+
+ // Hide items, this releases arenaitem
+ doc->getRoot()->invoke_hide(dkey);
+
+ return write_status ? EXPORT_OK : EXPORT_ERROR;
+}
+
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
diff --git a/src/helper/png-write.h b/src/helper/png-write.h
new file mode 100644
index 0000000..6c79d20
--- /dev/null
+++ b/src/helper/png-write.h
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_PNG_WRITE_H
+#define SEEN_SP_PNG_WRITE_H
+
+/*
+ * PNG file format utilities
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Peter Bostrom
+ * Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glib.h> // Only for gchar.
+#include <vector>
+
+#include <2geom/forward.h>
+
+class SPDocument;
+class SPItem;
+
+enum ExportResult {
+ EXPORT_ERROR = 0,
+ EXPORT_OK,
+ EXPORT_ABORTED
+};
+
+/**
+ * Export the given document as a Portable Network Graphics (PNG) file.
+ *
+ * @return EXPORT_OK if succeeded, EXPORT_ABORTED if no action was taken, EXPORT_ERROR (false) if an error occurred.
+ */
+ExportResult sp_export_png_file(SPDocument *doc, gchar const *filename,
+ double x0, double y0, double x1, double y1,
+ unsigned long int width, unsigned long int height, double xdpi, double ydpi,
+ unsigned long bgcolor,
+ unsigned int (*status) (float, void *), void *data, bool force_overwrite = false, const std::vector<SPItem*> &items_only = std::vector<SPItem*>(),
+ bool interlace = false, int color_type = 6, int bit_depth = 8, int zlib = 6, int antialiasing = 2);
+
+ExportResult sp_export_png_file(SPDocument *doc, gchar const *filename,
+ Geom::Rect const &area,
+ unsigned long int width, unsigned long int height, double xdpi, double ydpi,
+ unsigned long bgcolor,
+ unsigned int (*status) (float, void *), void *data, bool force_overwrite = false, const std::vector<SPItem*> &items_only = std::vector<SPItem*>(),
+ bool interlace = false, int color_type = 6, int bit_depth = 8, int zlib = 6, int antialiasing = 2);
+
+#endif // SEEN_SP_PNG_WRITE_H
diff --git a/src/helper/sp-marshal.list b/src/helper/sp-marshal.list
new file mode 100644
index 0000000..340d2c5
--- /dev/null
+++ b/src/helper/sp-marshal.list
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# marshallers for inkscape
+VOID:POINTER,UINT
+BOOLEAN:POINTER
+BOOLEAN:POINTER,UINT
+BOOLEAN:POINTER,POINTER
+INT:POINTER,POINTER
+DOUBLE:POINTER,UINT
+VOID:INT,INT
+VOID:STRING,STRING
diff --git a/src/helper/stock-items.cpp b/src/helper/stock-items.cpp
new file mode 100644
index 0000000..fbdf11c
--- /dev/null
+++ b/src/helper/stock-items.cpp
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Stock-items
+ *
+ * Stock Item management code
+ *
+ * Authors:
+ * John Cliff <simarilius@yahoo.com>
+ * Jon A. Cruz <jon@joncruz.org>
+ * Abhishek Sharma
+ *
+ * Copyright 2004 John Cliff
+ *
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#define noSP_SS_VERBOSE
+
+#include <cstring>
+#include <glibmm/fileutils.h>
+
+#include "path-prefix.h"
+
+#include <xml/repr.h>
+#include "inkscape.h"
+
+#include "io/sys.h"
+#include "io/resource.h"
+#include "stock-items.h"
+
+#include "object/sp-gradient.h"
+#include "object/sp-pattern.h"
+#include "object/sp-marker.h"
+#include "object/sp-defs.h"
+
+static SPDocument *load_paint_doc(char const *basename,
+ Inkscape::IO::Resource::Type type = Inkscape::IO::Resource::PAINT)
+{
+ using namespace Inkscape::IO::Resource;
+
+ for (Domain const domain : {SYSTEM, CREATE}) {
+ auto const filename = get_path_string(domain, type, basename);
+ if (Glib::file_test(filename, Glib::FILE_TEST_IS_REGULAR)) {
+ auto doc = SPDocument::createNewDoc(filename.c_str(), false);
+ if (doc) {
+ doc->ensureUpToDate();
+ return doc;
+ }
+ }
+ }
+
+ return nullptr;
+}
+
+// FIXME: these should be merged with the icon loading code so they
+// can share a common file/doc cache. This function should just
+// take the dir to look in, and the file to check for, and cache
+// against that, rather than the existing copy/paste code seen here.
+
+static SPObject * sp_marker_load_from_svg(gchar const *name, SPDocument *current_doc)
+{
+ if (!current_doc) {
+ return nullptr;
+ }
+ /* Try to load from document */
+ static SPDocument *doc = load_paint_doc("markers.svg", Inkscape::IO::Resource::MARKERS);
+
+ if (doc) {
+ /* Get the marker we want */
+ SPObject *object = doc->getObjectById(name);
+ if (object && SP_IS_MARKER(object)) {
+ SPDefs *defs = current_doc->getDefs();
+ Inkscape::XML::Document *xml_doc = current_doc->getReprDoc();
+ Inkscape::XML::Node *mark_repr = object->getRepr()->duplicate(xml_doc);
+ defs->getRepr()->addChild(mark_repr, nullptr);
+ SPObject *cloned_item = current_doc->getObjectByRepr(mark_repr);
+ Inkscape::GC::release(mark_repr);
+ return cloned_item;
+ }
+ }
+ return nullptr;
+}
+
+
+static SPObject *
+sp_pattern_load_from_svg(gchar const *name, SPDocument *current_doc)
+{
+ if (!current_doc) {
+ return nullptr;
+ }
+ /* Try to load from document */
+ static SPDocument *doc = load_paint_doc("patterns.svg");
+
+ if (doc) {
+ /* Get the pattern we want */
+ SPObject *object = doc->getObjectById(name);
+ if (object && SP_IS_PATTERN(object)) {
+ SPDefs *defs = current_doc->getDefs();
+ Inkscape::XML::Document *xml_doc = current_doc->getReprDoc();
+ Inkscape::XML::Node *pat_repr = object->getRepr()->duplicate(xml_doc);
+ defs->getRepr()->addChild(pat_repr, nullptr);
+ Inkscape::GC::release(pat_repr);
+ return object;
+ }
+ }
+ return nullptr;
+}
+
+
+static SPObject *
+sp_gradient_load_from_svg(gchar const *name, SPDocument *current_doc)
+{
+ if (!current_doc) {
+ return nullptr;
+ }
+ /* Try to load from document */
+ static SPDocument *doc = load_paint_doc("gradients.svg");
+
+ if (doc) {
+ /* Get the gradient we want */
+ SPObject *object = doc->getObjectById(name);
+ if (object && SP_IS_GRADIENT(object)) {
+ SPDefs *defs = current_doc->getDefs();
+ Inkscape::XML::Document *xml_doc = current_doc->getReprDoc();
+ Inkscape::XML::Node *pat_repr = object->getRepr()->duplicate(xml_doc);
+ defs->getRepr()->addChild(pat_repr, nullptr);
+ Inkscape::GC::release(pat_repr);
+ return object;
+ }
+ }
+ return nullptr;
+}
+
+// get_stock_item returns a pointer to an instance of the desired stock object in the current doc
+// if necessary it will import the object. Copes with name clashes through use of the inkscape:stockid property
+// This should be set to be the same as the id in the library file.
+
+SPObject *get_stock_item(gchar const *urn, gboolean stock)
+{
+ g_assert(urn != nullptr);
+
+ /* check its an inkscape URN */
+ if (!strncmp (urn, "urn:inkscape:", 13)) {
+
+ gchar const *e = urn + 13;
+ int a = 0;
+ gchar * name = g_strdup(e);
+ gchar *name_p = name;
+ while (*name_p != ':' && *name_p != '\0'){
+ name_p++;
+ a++;
+ }
+
+ if (*name_p ==':') {
+ name_p++;
+ }
+
+ gchar * base = g_strndup(e, a);
+
+ SPDocument *doc = SP_ACTIVE_DOCUMENT;
+ SPDefs *defs = doc->getDefs();
+ if (!defs) {
+ g_free(base);
+ return nullptr;
+ }
+ SPObject *object = nullptr;
+ if (!strcmp(base, "marker") && !stock) {
+ for (auto& child: defs->children)
+ {
+ if (child.getRepr()->attribute("inkscape:stockid") &&
+ !strcmp(name_p, child.getRepr()->attribute("inkscape:stockid")) &&
+ SP_IS_MARKER(&child))
+ {
+ object = &child;
+ }
+ }
+ }
+ else if (!strcmp(base,"pattern") && !stock) {
+ for (auto& child: defs->children)
+ {
+ if (child.getRepr()->attribute("inkscape:stockid") &&
+ !strcmp(name_p, child.getRepr()->attribute("inkscape:stockid")) &&
+ SP_IS_PATTERN(&child))
+ {
+ object = &child;
+ }
+ }
+ }
+ else if (!strcmp(base,"gradient") && !stock) {
+ for (auto& child: defs->children)
+ {
+ if (child.getRepr()->attribute("inkscape:stockid") &&
+ !strcmp(name_p, child.getRepr()->attribute("inkscape:stockid")) &&
+ SP_IS_GRADIENT(&child))
+ {
+ object = &child;
+ }
+ }
+ }
+
+ if (object == nullptr) {
+
+ if (!strcmp(base, "marker")) {
+ object = sp_marker_load_from_svg(name_p, doc);
+ }
+ else if (!strcmp(base, "pattern")) {
+ object = sp_pattern_load_from_svg(name_p, doc);
+ }
+ else if (!strcmp(base, "gradient")) {
+ object = sp_gradient_load_from_svg(name_p, doc);
+ }
+ }
+
+ g_free(base);
+ g_free(name);
+
+ if (object) {
+ object->setAttribute("inkscape:isstock", "true");
+ }
+
+ return object;
+ }
+
+ else {
+
+ SPDocument *doc = SP_ACTIVE_DOCUMENT;
+ SPObject *object = doc->getObjectById(urn);
+
+ return object;
+ }
+}
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
diff --git a/src/helper/stock-items.h b/src/helper/stock-items.h
new file mode 100644
index 0000000..0d1bb20
--- /dev/null
+++ b/src/helper/stock-items.h
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors:
+ * see git history
+ * John Cliff <simarilius@yahoo.com>
+ *
+ * Copyright (C) 2012 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef SEEN_INK_STOCK_ITEMS_H
+#define SEEN_INK_STOCK_ITEMS_H
+
+#include <glib.h>
+
+class SPObject;
+
+SPObject *get_stock_item(gchar const *urn, gboolean stock=FALSE);
+
+#endif // SEEN_INK_STOCK_ITEMS_H
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 17:51:09 +0000