reworked unwind_paths
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a4513bbe32
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165e5b6067
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#!/usr/bin/env python3
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# coding=utf-8
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#
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# Copyright (C) [2021] [Joseph Zakar], [observing@gmail.com]
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""
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For each selected path element, this extension creates an additional path element
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consisting of horizontal line segments which are the same size as the original
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line segments.
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17.05.2021: Mario Voigt: added option to extrude as a band (add height; adds vertical lines and another horizontal path)
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"""
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import inkex
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from lxml import etree
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import math
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class HLines(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--extrude', type=inkex.Boolean, default=False)
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pars.add_argument('--extrude_height', type=float, default=10.000)
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pars.add_argument('--unit', default="mm")
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#draw an SVG line segment between the given (raw) points
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def drawline(self, pathData, name, parent):
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line_style = {'stroke':'#000000','stroke-width':'1px','fill':'none'}
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line_attribs = {'style' : str(inkex.Style(line_style)),
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inkex.addNS('label','inkscape') : name,
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'd' : pathData}
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line = etree.SubElement(parent, inkex.addNS('path','svg'), line_attribs )
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def effect(self):
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path_num = 0
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#for elem in self.svg.get_selected(): # for each selected element (Ver. 1.0)
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for elem in self.svg.selection.filter(inkex.PathElement).values(): # for each selected element (Ver. 1.02+)
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#inkex.utils.debug(type(elem))
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#inkex.utils.debug(elem.bounding_box())
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#inkex.utils.debug(elem.path)
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elemGroup = self.svg.get_current_layer().add(inkex.Group(id="unwinding-" + elem.get('id'))) #make a new group at root level
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if elem.typename == 'PathElement': # Only process path elements
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xbound,ybound = elem.bounding_box() # Get bounds of this element
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xmin,xmax = xbound
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ymin,ymax = ybound
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ntotal = len(elem.path)
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nodecnt = 0
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startx = 0
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starty = ymax + 10
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endx = 0
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endy = starty
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xoffset = 0
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orig_sx = 0
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orig_sy = 0
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orig_ex = 0
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orig_ey = 0
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sx1 = 0
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sy1 = 0
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orig_length = 0
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last_letter = 'M'
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TopCommandSet = ""
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DownCommandSet = ""
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shifting = self.svg.unittouu(str(self.options.extrude_height) + self.options.unit)
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for ptoken in elem.path.to_absolute(): # For each point in the path
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#inkex.utils.debug(type(ptoken))
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#inkex.utils.debug(ptoken)
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startx = xmin + xoffset
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if ptoken.letter == 'M': # Starting a new line
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orig_sx = ptoken.x
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orig_sy = ptoken.y
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TopCommandSet = 'M {:0.6f},{:0.6f}'.format(startx, starty)
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DownCommandSet = 'M {:0.6f},{:0.6f}'.format(startx, starty + shifting)
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sx1 = orig_sx
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sy1 = orig_sy
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if self.options.extrude is True:
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self.drawline("M {:0.6f},{:0.6f} L {:0.6f},{:0.6f}".format(sx1, endy, sx1 , endy + shifting),"vline{0}".format(path_num), elemGroup)
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else:
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if last_letter != 'M':
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orig_sx = orig_ex
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orig_sy = orig_ey
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if ptoken.letter == 'L':
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orig_ex = ptoken.x
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orig_ey = ptoken.y
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orig_length = math.sqrt((orig_sx-orig_ex)**2 + (orig_sy-orig_ey)**2)
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endx = startx + orig_length
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TopCommandSet = TopCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy)
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DownCommandSet = DownCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy + shifting)
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elif ptoken.letter == 'H':
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if last_letter == 'M':
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orig_ey = orig_sy
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orig_length = abs(orig_sx - ptoken.x)
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orig_ex = ptoken.x
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endx = startx + orig_length
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TopCommandSet = TopCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy)
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DownCommandSet = DownCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy + shifting)
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elif ptoken.letter == 'V':
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if last_letter == 'M':
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orig_ex = orig_sx
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orig_length = abs(orig_sy - ptoken.y)
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orig_ey = ptoken.y
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endx = startx + orig_length
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TopCommandSet = TopCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy)
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DownCommandSet = DownCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy + shifting)
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elif ptoken.letter == 'Z':
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orig_ex = sx1
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orig_ey = sy1
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orig_length = math.sqrt((orig_sx-orig_ex)**2 + (orig_sy-orig_ey)**2)
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endx = startx + orig_length
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TopCommandSet = TopCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy)
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DownCommandSet = DownCommandSet + ' L {:0.6f},{:0.6f}'.format(endx, endy + shifting)
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else:
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inkex.utils.debug("Unknown letter - {0}".format(ptoken.letter))
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inkex.utils.debug("Path may not contain bezier type commands. Convert to polyline before!")
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exit(1)
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if self.options.extrude is True:
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self.drawline("M {:0.6f},{:0.6f} L {:0.6f},{:0.6f}".format(endx, endy, endx , endy + shifting),"vline{0}".format(path_num), elemGroup)
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nodecnt = nodecnt + 1
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if ptoken.letter != 'M':
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if nodecnt == ntotal:
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self.drawline(TopCommandSet,"hline{0}".format(path_num), elemGroup)
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if self.options.extrude is True:
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self.drawline(DownCommandSet,"hline{0}".format(path_num), elemGroup)
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path_num = path_num + 1
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xoffset = xoffset + orig_length
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last_letter = ptoken.letter
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if __name__ == '__main__':
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HLines().run()
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@ -1,7 +1,7 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
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<name>Unwind Paths (Hlines)</name>
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<id>fablabchemnitz.de.hlines</id>
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<name>Unwind Paths</name>
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<id>fablabchemnitz.de.unwind_paths</id>
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<param name="extrude" type="bool" gui-text="Extrude">false</param>
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<param name="extrude_height" type="float" min="0.000" max="99999.000" precision="3" gui-text="Extrude height">10.000</param>
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<param name="unit" gui-text="Unit" type="optiongroup" appearance="combo">
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@ -21,6 +21,6 @@
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</effects-menu>
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</effect>
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<script>
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<command location="inx" interpreter="python">hlines.py</command>
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<command location="inx" interpreter="python">unwind_paths.py</command>
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</script>
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</inkscape-extension>
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@ -0,0 +1,77 @@
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#!/usr/bin/env python3
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"""
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For each selected path element, this extension creates an additional path element
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consisting of horizontal line segments which are the same size as the original
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line segments. Has option to extrude as a band (add height; adds vertical lines and another horizontal path)
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ToDo:
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- option to colorize each line segment of the original curve (we need to split and group the original one to do this). We map the colors to the unwinded paths
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- handle combined paths correctly
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- copy style of input paths and only apply new colors
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"""
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import inkex
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from inkex import bezier
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from lxml import etree
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import math
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class UnwindPaths(inkex.EffectExtension):
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#draw an SVG line segment between the given (raw) points
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def drawline(self, pathData, name, parent):
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line_style = {'stroke':'#000000','stroke-width':'1px','fill':'none'}
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line_attribs = {'style' : str(inkex.Style(line_style)),
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inkex.addNS('label','inkscape') : name,
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'd' : pathData}
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line = etree.SubElement(parent, inkex.addNS('path','svg'), line_attribs )
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def add_arguments(self, pars):
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pars.add_argument('--extrude', type=inkex.Boolean, default=False)
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pars.add_argument('--extrude_height', type=float, default=10.000)
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pars.add_argument('--unit', default="mm")
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def effect(self):
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path_num = 0
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shifting = self.svg.unittouu(str(self.options.extrude_height) + self.options.unit)
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for element in self.svg.selection.filter(inkex.PathElement).values():
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elemGroup = self.svg.get_current_layer().add(inkex.Group(id="unwinding-" + element.get('id')))
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#beginning point of the unwind band:
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bbox = element.bounding_box() #shift the element to the bottom of the element
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xmin = bbox.left
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ymax = bbox.bottom
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for sub in element.path.to_superpath():
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new = []
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new.append([sub[0]])
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i = 1
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topPathData = "m {:0.6f},{:0.6f} ".format(xmin, ymax)
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bottomPathData = "m {:0.6f},{:0.6f} ".format(xmin, ymax + shifting)
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lengths = []
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while i <= len(sub) - 1:
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length = bezier.cspseglength(new[-1][-1], sub[i]) #sub path length
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lengths.append(length)
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segment = "l {:0.6f},{:0.0f} ".format(length, 0)
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topPathData += segment
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bottomPathData += segment
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new[-1].append(sub[i])
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i += 1
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self.drawline(topPathData, "hline-top-{0}".format(element.get('id')), elemGroup)
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if self.options.extrude is True:
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self.drawline(bottomPathData, "hline-bottom-{0}".format(element.get('id')), elemGroup)
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#draw as much vertical lines as segments in bezier + start + end vertical line
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin, ymax, shifting),"vline{0}".format(path_num), elemGroup)
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin + sum([length for length in lengths]), ymax, shifting),"vline{0}".format(path_num), elemGroup)
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x = 0
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for n in range(0, i-1):
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x += lengths[n]
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin + x, ymax, shifting),"vline{0}".format(path_num), elemGroup)
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if __name__ == '__main__':
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UnwindPaths().run()
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