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-rwxr-xr-xshare/extensions/addnodes.py87
1 files changed, 87 insertions, 0 deletions
diff --git a/share/extensions/addnodes.py b/share/extensions/addnodes.py
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+++ b/share/extensions/addnodes.py
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+#!/usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2005, 2007 Aaron Spike, aaron@ekips.org
+#
+# 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 either adds nodes to a path so that
+
+ No segment is longer than a maximum value OR that each segment is divided
+ into a given number of equal segments.
+
+"""
+import math
+import inkex
+
+from inkex import bezier, PathElement, CubicSuperPath
+
+
+class AddNodes(inkex.EffectExtension):
+ """Extension to split a path by adding nodes to it"""
+
+ def add_arguments(self, pars):
+ pars.add_argument(
+ "--segments",
+ type=int,
+ default=2,
+ help="Number of segments to divide the path into",
+ )
+ pars.add_argument(
+ "--max",
+ type=float,
+ default=10.0,
+ help="Number of segments to divide the path into",
+ )
+ pars.add_argument(
+ "--method", default="bymax", help="The kind of division to perform"
+ )
+ pars.add_argument(
+ "--unit", default="px", help="Unit for maximum segment length"
+ )
+
+ def effect(self):
+ for node in self.svg.selection.filter(PathElement):
+ new = []
+ for sub in node.path.to_superpath():
+ new.append([sub[0][:]])
+ i = 1
+ while i <= len(sub) - 1:
+ length = bezier.cspseglength(new[-1][-1], sub[i])
+
+ if self.options.method == "bynum":
+ splits = self.options.segments
+ else:
+ maxlen = self.svg.viewport_to_unit(
+ f"{self.options.max}{self.options.unit}"
+ )
+ splits = math.ceil(length / maxlen)
+
+ for sel in range(int(splits), 1, -1):
+ result = bezier.cspbezsplitatlength(
+ new[-1][-1], sub[i], 1.0 / sel
+ )
+ better_result = [
+ [list(el) for el in elements] for elements in result
+ ]
+ new[-1][-1], nxt, sub[i] = better_result
+ new[-1].append(nxt[:])
+ new[-1].append(sub[i])
+ i += 1
+ node.path = CubicSuperPath(new).to_path(curves_only=False)
+
+
+if __name__ == "__main__":
+ AddNodes().run()