summaryrefslogtreecommitdiffstats
path: root/src/live_effects/lpe-spiro.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/live_effects/lpe-spiro.cpp149
1 files changed, 149 insertions, 0 deletions
diff --git a/src/live_effects/lpe-spiro.cpp b/src/live_effects/lpe-spiro.cpp
new file mode 100644
index 0000000..e0464a2
--- /dev/null
+++ b/src/live_effects/lpe-spiro.cpp
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#define INKSCAPE_LPE_SPIRO_C
+
+/*
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/lpe-spiro.h"
+
+#include "display/curve.h"
+#include <2geom/curves.h>
+#include "helper/geom-nodetype.h"
+#include "helper/geom-curves.h"
+
+#include "live_effects/spiro.h"
+
+// For handling un-continuous paths:
+#include "message-stack.h"
+#include "inkscape.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+LPESpiro::LPESpiro(LivePathEffectObject *lpeobject) :
+ Effect(lpeobject)
+{
+}
+
+LPESpiro::~LPESpiro()
+= default;
+
+void
+LPESpiro::doEffect(SPCurve * curve)
+{
+ sp_spiro_do_effect(curve);
+}
+
+void sp_spiro_do_effect(SPCurve *curve){
+ using Geom::X;
+ using Geom::Y;
+
+ // Make copy of old path as it is changed during processing
+ Geom::PathVector const original_pathv = curve->get_pathvector();
+ guint len = curve->get_segment_count() + 2;
+
+ curve->reset();
+ Spiro::spiro_cp *path = g_new (Spiro::spiro_cp, len);
+ int ip = 0;
+
+ for(const auto & path_it : original_pathv) {
+ if (path_it.empty())
+ continue;
+
+ // start of path
+ {
+ Geom::Point p = path_it.initialPoint();
+ path[ip].x = p[X];
+ path[ip].y = p[Y];
+ path[ip].ty = '{' ; // for closed paths, this is overwritten
+ ip++;
+ }
+
+ // midpoints
+ Geom::Path::const_iterator curve_it1 = path_it.begin(); // incoming curve
+ Geom::Path::const_iterator curve_it2 = ++(path_it.begin()); // outgoing curve
+ Geom::Path::const_iterator curve_endit = path_it.end_default(); // this determines when the loop has to stop
+
+ while ( curve_it2 != curve_endit )
+ {
+ /* This deals with the node between curve_it1 and curve_it2.
+ * Loop to end_default (so without last segment), loop ends when curve_it2 hits the end
+ * and then curve_it1 points to end or closing segment */
+ Geom::Point p = curve_it1->finalPoint();
+ path[ip].x = p[X];
+ path[ip].y = p[Y];
+
+ // Determine type of spiro node this is, determined by the tangents (angles) of the curves
+ // TODO: see if this can be simplified by using /helpers/geom-nodetype.cpp:get_nodetype
+ bool this_is_line = is_straight_curve(*curve_it1);
+ bool next_is_line = is_straight_curve(*curve_it2);
+
+ Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2);
+
+ if ( nodetype == Geom::NODE_SMOOTH || nodetype == Geom::NODE_SYMM )
+ {
+ if (this_is_line && !next_is_line) {
+ path[ip].ty = ']';
+ } else if (next_is_line && !this_is_line) {
+ path[ip].ty = '[';
+ } else {
+ path[ip].ty = 'c';
+ }
+ } else {
+ path[ip].ty = 'v';
+ }
+
+ ++curve_it1;
+ ++curve_it2;
+ ip++;
+ }
+
+ // add last point to the spiropath
+ Geom::Point p = curve_it1->finalPoint();
+ path[ip].x = p[X];
+ path[ip].y = p[Y];
+ if (path_it.closed()) {
+ // curve_it1 points to the (visually) closing segment. determine the match between first and this last segment (the closing node)
+ Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, path_it.front());
+ switch (nodetype) {
+ case Geom::NODE_NONE: // can't happen! but if it does, it means the path isn't closed :-)
+ path[ip].ty = '}';
+ ip++;
+ break;
+ case Geom::NODE_CUSP:
+ path[0].ty = path[ip].ty = 'v';
+ break;
+ case Geom::NODE_SMOOTH:
+ case Geom::NODE_SYMM:
+ path[0].ty = path[ip].ty = 'c';
+ break;
+ }
+ } else {
+ // set type to path closer
+ path[ip].ty = '}';
+ ip++;
+ }
+
+ // run subpath through spiro
+ int sp_len = ip;
+ Spiro::spiro_run(path, sp_len, *curve);
+ ip = 0;
+ }
+
+ g_free (path);
+}
+
+}; //namespace LivePathEffect
+}; /* 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 :