1 files changed, 139 insertions, 0 deletions
diff --git a/src/svg/svg-path.cpp b/src/svg/svg-path.cpp
new file mode 100644
index 0000000..555b2c2
--- /dev/null
+++ b/src/svg/svg-path.cpp
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * svg-path.cpp: Parse SVG path element data into bezier path.
+ * Authors:
+ *   Johan Engelen
+ *   (old nartbpath code that has been deleted: Raph Levien <raph@artofcode.com>)
+ *   (old nartbpath code that has been deleted: Lauris Kaplinski <lauris@ximian.com>)
+ *
+ * Copyright (C) 2000 Eazel, Inc.
+ * Copyright (C) 2000 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Copyright (C) 2000-2008 authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <string>
+#include <glib.h> // g_assert()
+
+#include <2geom/pathvector.h>
+#include <2geom/curves.h>
+#include <2geom/sbasis-to-bezier.h>
+#include <2geom/path-sink.h>
+#include <2geom/svg-path-parser.h>
+
+#include "svg/svg.h"
+#include "svg/path-string.h"
+
+/*
+ * Parses the path in str. When an error is found in the pathstring, this method
+ * returns a truncated path up to where the error was found in the pathstring.
+ * Returns an empty PathVector when str==NULL
+ */
+Geom::PathVector sp_svg_read_pathv(char const * str)
+{
+    Geom::PathVector pathv;
+    if (!str)
+        return pathv;  // return empty pathvector when str == NULL
+
+    Geom::PathBuilder builder(pathv);
+    Geom::SVGPathParser parser(builder);
+    parser.setZSnapThreshold(Geom::EPSILON);
+
+    try {
+        parser.parse(str);
+    }
+    catch (Geom::SVGPathParseError &e) {
+        builder.flush();
+        // This warning is extremely annoying when testing
+        g_warning(
+            "Malformed SVG path, truncated path up to where error was found.\n Input path=\"%s\"\n Parsed path=\"%s\"",
+            str, sp_svg_write_path(pathv).c_str());
+    }
+
+    return pathv;
+}
+
+static void sp_svg_write_curve(Inkscape::SVG::PathString & str, Geom::Curve const * c) {
+    // TODO: this code needs to removed and replaced by appropriate path sink
+    if(Geom::LineSegment const *line_segment = dynamic_cast<Geom::LineSegment const  *>(c)) {
+        // don't serialize stitch segments
+        if (!dynamic_cast<Geom::Path::StitchSegment const *>(c)) {
+            if (line_segment->initialPoint()[Geom::X] == line_segment->finalPoint()[Geom::X]) {
+                str.verticalLineTo( line_segment->finalPoint()[Geom::Y] );
+            } else if (line_segment->initialPoint()[Geom::Y] == line_segment->finalPoint()[Geom::Y]) {
+                str.horizontalLineTo( line_segment->finalPoint()[Geom::X] );
+            } else {
+                str.lineTo( (*line_segment)[1][0], (*line_segment)[1][1] );
+            }
+        }
+    }
+    else if(Geom::QuadraticBezier const *quadratic_bezier = dynamic_cast<Geom::QuadraticBezier const  *>(c)) {
+        str.quadTo( (*quadratic_bezier)[1][0], (*quadratic_bezier)[1][1],
+                    (*quadratic_bezier)[2][0], (*quadratic_bezier)[2][1] );
+    }
+    else if(Geom::CubicBezier const *cubic_bezier = dynamic_cast<Geom::CubicBezier const  *>(c)) {
+        str.curveTo( (*cubic_bezier)[1][0], (*cubic_bezier)[1][1],
+                     (*cubic_bezier)[2][0], (*cubic_bezier)[2][1],
+                     (*cubic_bezier)[3][0], (*cubic_bezier)[3][1] );
+    }
+    else if(Geom::EllipticalArc const *elliptical_arc = dynamic_cast<Geom::EllipticalArc const *>(c)) {
+        str.arcTo( elliptical_arc->ray(Geom::X), elliptical_arc->ray(Geom::Y),
+                   Geom::deg_from_rad(elliptical_arc->rotationAngle()),
+                   elliptical_arc->largeArc(), elliptical_arc->sweep(),
+                   elliptical_arc->finalPoint() );
+    } 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) {
+            sp_svg_write_curve(str, &iter);
+        }
+    }
+}
+
+static void sp_svg_write_path(Inkscape::SVG::PathString & str, Geom::Path const & p) {
+    str.moveTo( p.initialPoint()[0], p.initialPoint()[1] );
+
+    for(Geom::Path::const_iterator cit = p.begin(); cit != p.end_open(); ++cit) {
+        sp_svg_write_curve(str, &(*cit));
+    }
+
+    if (p.closed()) {
+        str.closePath();
+    }
+}
+
+std::string sp_svg_write_path(Geom::PathVector const &p) {
+    Inkscape::SVG::PathString str;
+
+    for(const auto & pit : p) {
+        sp_svg_write_path(str, pit);
+    }
+
+    return str;
+}
+
+std::string sp_svg_write_path(Geom::Path const &p) {
+    Inkscape::SVG::PathString str;
+
+    sp_svg_write_path(str, p);
+
+    return str;
+}
+
+/*
+  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 :