1 files changed, 105 insertions, 0 deletions
diff --git a/share/extensions/convert2dashes.py b/share/extensions/convert2dashes.py
new file mode 100755
index 0000000..4583ed4
--- /dev/null
+++ b/share/extensions/convert2dashes.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
+# Copyright (C) 2009 Alvin Penner, penner@vaxxine.com
+#
+# This program 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.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+"""
+This extension converts a path into a dashed line using 'stroke-dasharray'
+It is a modification of the file addnodes.py
+"""
+import inkex
+from inkex import bezier, CubicSuperPath, Group, PathElement
+from inkex.localization import inkex_gettext as _
+
+
+class Dashit(inkex.EffectExtension):
+    """Extension to convert paths into dash-array line"""
+
+    def __init__(self):
+        super(Dashit, self).__init__()
+        self.not_converted = []
+
+    def effect(self):
+        for node in self.svg.selection:
+            self.convert2dash(node)
+        if self.not_converted:
+            inkex.errormsg(
+                _("Total number of objects not converted: {}\n").format(
+                    len(self.not_converted)
+                )
+            )
+            # return list of IDs in case the user needs to find a specific object
+            inkex.debug(self.not_converted)
+
+    def convert2dash(self, node):
+        """Convert each selected node's dash array"""
+        if isinstance(node, Group):
+            for child in node:
+                self.convert2dash(child)
+        elif isinstance(node, PathElement):
+            self._convert(node)
+        else:
+            self.not_converted.append(node.get("id"))
+
+    @staticmethod
+    def _convert(node):
+        dashes = []
+        offset = 0
+        style = node.specified_style()
+        dashes = style("stroke-dasharray")
+        offset = style("stroke-dashoffset")
+        if not dashes:
+            return
+        new = []
+        for sub in node.path.to_superpath():
+            idash = 0
+            dash = dashes[0]
+            length = float(offset)
+            while dash < length:
+                length = length - dash
+                idash = (idash + 1) % len(dashes)
+                dash = dashes[idash]
+            new.append([sub[0][:]])
+            i = 1
+            while i < len(sub):
+                dash = dash - length
+                length = bezier.cspseglength(new[-1][-1], sub[i])
+                while dash < length:
+                    new[-1][-1], nxt, sub[i] = bezier.cspbezsplitatlength(
+                        new[-1][-1], sub[i], dash / length
+                    )
+                    if idash % 2:  # create a gap
+                        new.append([nxt[:]])
+                    else:  # splice the curve
+                        new[-1].append(nxt[:])
+                    length = length - dash
+                    idash = (idash + 1) % len(dashes)
+                    dash = dashes[idash]
+                if idash % 2:
+                    new.append([sub[i]])
+                else:
+                    new[-1].append(sub[i])
+                i += 1
+        style.pop("stroke-dasharray")
+        node.pop("sodipodi:type")
+        node.path = CubicSuperPath(new).to_path(rtol=1e-10)
+        node.style = style
+
+
+if __name__ == "__main__":
+    Dashit().run()