Added offset paths
This commit is contained in:
Mario Voigt
parent
67de370574
commit
b9fb5042e4
29
extensions/fablabchemnitz_ofsplot.inx
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extensions/fablabchemnitz_ofsplot.inx
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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>Ofsplot (Offset Paths)</name>
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<id>fablabchemnitz.de.ofsplot</id>
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<param name="count" type="int" min="0" max="100000" gui-text="Number of offset paths:">10</param>
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<param name="offset" type="float" min="-1000" max="+1000" gui-text="Offset between two paths:">0.8</param>
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<param name="init_offset" type="float" min="-1000" max="+1000" gui-text="Initial offset from original path:">0.8</param>
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<param name="copy_org" type="bool" gui-text="Copy original path (=keep it)">false</param>
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<param name="offset_increase" type="float" min="-1000" max="+1000" gui-text="Offset increase per iteration:">0.8</param>
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<param name="miterlimit" type="float" min="0.0" max="1000" gui-text="Miter limit">3.0</param>
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<param name="clipperscale" type="float" min="0.0" max="9999.0" gui-text="Scaling factor">1024.0</param>
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<param name="jointype" appearance="combo" type="optiongroup" default="2" gui-text="Join type">
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<option value="0">Square</option>
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<option value="1">Round</option>
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<option value="2">Miter</option>
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</param>
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<param name="settingsHelp" type="description">Python library pyclipper needs to be installed. Use Flatten Bezier plugin in advance of this plugin.</param>
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<effect>
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<object-type>all</object-type>
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<effects-menu>
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<submenu name="FabLab Chemnitz">
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<submenu name="Shape/Pattern from existing Path(s)"/>
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</submenu>
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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">fablabchemnitz_ofsplot.py</command>
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</script>
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</inkscape-extension>
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82
extensions/fablabchemnitz_ofsplot.py
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extensions/fablabchemnitz_ofsplot.py
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#!/usr/bin/env python3
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import inkex
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import math
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from inkex.paths import CubicSuperPath
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import re
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import pyclipper
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class ofsplot(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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self.arg_parser.add_argument("--count", type=int, default=10, help="Number of offset operations")
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self.arg_parser.add_argument("--offset", type=float, default=2.0, help="Offset amount")
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self.arg_parser.add_argument("--init_offset", type=float, default=2.0, help="Initial Offset Amount")
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self.arg_parser.add_argument("--copy_org", type=inkex.Boolean, default=True, help="copy original path")
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self.arg_parser.add_argument("--offset_increase", type=float, default=2.0, help="Offset increase between iterations")
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self.arg_parser.add_argument("--jointype", default="2", help="Join type")
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self.arg_parser.add_argument("--miterlimit", type=float, default=3.0, help="Miter limit")
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self.arg_parser.add_argument("--clipperscale", type=float, default=1024.0, help="Scaling factor")
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def effect(self):
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paths = self.svg.selection.filter(inkex.PathElement)
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if len(paths) == 0:
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inkex.errormsg("No paths selected.")
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exit()
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for path in paths:
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if path.tag == inkex.addNS('path','svg'):
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p = CubicSuperPath(path.get('d'))
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scale_factor = self.options.clipperscale # 2 ** 32 = 1024 - see also https://github.com/fonttools/pyclipper/wiki/Deprecating-SCALING_FACTOR
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pco = pyclipper.PyclipperOffset(self.options.miterlimit)
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JT = pyclipper.JT_MITER
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if self.options.jointype == "0":
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JT = pyclipper.JT_SQUARE
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elif self.options.jointype == "1":
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JT = pyclipper.JT_ROUND
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elif self.options.jointype == "2":
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JT = pyclipper.JT_MITER
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new = []
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# load in initial paths
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for sub in p:
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sub_simple = []
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for item in sub:
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itemx = [float(z)*scale_factor for z in item[1]]
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sub_simple.append(itemx)
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pco.AddPath(sub_simple, JT, pyclipper.ET_CLOSEDPOLYGON)
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# calculate offset paths for different offset amounts
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offset_list = []
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offset_list.append(self.options.init_offset)
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for i in range(0,self.options.count+1):
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ofs_inc = +math.pow(float(i)*self.options.offset_increase,2)
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if self.options.offset_increase <0:
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ofs_inc = -ofs_inc
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offset_list.append(offset_list[0]+float(i)*self.options.offset+ofs_inc)
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solutions = []
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for offset in offset_list:
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solution = pco.Execute(offset * scale_factor)
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solutions.append(solution)
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if len(solution)<=0:
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continue # no more loops to go, will provide no results.
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# re-arrange solutions to fit expected format & add to array
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for solution in solutions:
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for sol in solution:
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solx = [[float(s[0]) / scale_factor, float(s[1]) / scale_factor] for s in sol]
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sol_p = [[a,a,a] for a in solx]
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sol_p.append(sol_p[0][:])
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new.append(sol_p)
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# add old, just to keep (make optional!)
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if self.options.copy_org:
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for sub in p:
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new.append(sub)
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path.set('d',CubicSuperPath(new))
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ofsplot().run()
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