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#!/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()
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