124 lines
5.6 KiB
Python
124 lines
5.6 KiB
Python
#!/usr/bin/env python3
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'''
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Inkscape extension to copy length of the source path to the selected
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destination path(s)
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Copyright (C) 2018 Shrinivas Kulkarni
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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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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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'''
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import inkex
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from inkex import bezier, Path, CubicSuperPath, PathElement
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class ScaleToPathLength(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--scale', type = float, default = '1', help = 'Additionally scale the length by')
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pars.add_argument('--scaleFrom', default = 'center', help = 'Scale Path From')
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pars.add_argument('--precision', type = int, default = '5', help = 'Number of significant digits')
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pars.add_argument("--override_selection", type = inkex.Boolean, default = False, help = "Use a custom length instead using the length of the first object in selection")
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pars.add_argument("--custom_length", type = float, default = 100.000, help = "Custom length")
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pars.add_argument("--unit", default = "mm", help = "Units")
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def scaleCubicSuper(self, cspath, scaleFactor, scaleFrom):
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bbox = Path(cspath).bounding_box()
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if(scaleFrom == 'topLeft'):
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oldOrigin= [bbox.left, bbox.bottom]
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elif(scaleFrom == 'topRight'):
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oldOrigin= [bbox.right, bbox.bottom]
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elif(scaleFrom == 'bottomLeft'):
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oldOrigin= [bbox.left, bbox.top]
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elif(scaleFrom == 'bottomRight'):
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oldOrigin= [bbox.right, bbox.top]
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else: #if(scaleFrom == 'center'):
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oldOrigin= [bbox.left + (bbox.right - bbox.left) / 2., bbox.bottom + (bbox.top - bbox.bottom) / 2.]
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newOrigin = [oldOrigin[0] * scaleFactor , oldOrigin[1] * scaleFactor ]
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for subpath in cspath:
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for bezierPt in subpath:
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for i in range(0, len(bezierPt)):
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bezierPt[i] = [bezierPt[i][0] * scaleFactor,
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bezierPt[i][1] * scaleFactor]
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bezierPt[i][0] += (oldOrigin[0] - newOrigin[0])
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bezierPt[i][1] += (oldOrigin[1] - newOrigin[1])
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def getPartsFromCubicSuper(self, cspath):
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parts = []
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for subpath in cspath:
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part = []
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prevBezPt = None
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for i, bezierPt in enumerate(subpath):
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if(prevBezPt != None):
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seg = [prevBezPt[1], prevBezPt[2], bezierPt[0], bezierPt[1]]
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part.append(seg)
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prevBezPt = bezierPt
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parts.append(part)
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return parts
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def getLength(self, cspath, tolerance):
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parts = self.getPartsFromCubicSuper(cspath)
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curveLen = 0
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for i, part in enumerate(parts):
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for j, seg in enumerate(part):
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curveLen += bezier.bezierlength((seg[0], seg[1], seg[2], seg[3]), tolerance = tolerance)
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return curveLen
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def effect(self):
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scale = self.options.scale
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scaleFrom = self.options.scaleFrom
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tolerance = 10 ** (-1 * self.options.precision)
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selections = self.svg.selected
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pathNodes = self.svg.selection.filter(PathElement).values()
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paths = [(pathNode.get('id'), CubicSuperPath(pathNode.get('d'))) for pathNode in pathNodes]
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if self.options.override_selection is False:
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if(len(paths) > 1):
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srcPath = paths[-1][1]
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srclen = self.getLength(srcPath, tolerance)
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paths = paths[:len(paths)-1]
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for key, cspath in paths:
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curveLen = self.getLength(cspath, tolerance)
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self.scaleCubicSuper(cspath, scaleFactor = scale * (srclen / curveLen), scaleFrom = scaleFrom)
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try: #we wrap this in try-except because if the elements are within groups it will cause errors
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selections[key].set('d', CubicSuperPath(cspath))
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except:
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pass
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else:
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inkex.errormsg("Please select at least two paths, with the path whose length is to be copied at the top. You may have to convert the shape to path with path->Object to Path.")
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else:
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if(len(paths) > 0):
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srclen = self.svg.unittouu(str(self.options.custom_length) + self.options.unit)
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for key, cspath in paths:
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curveLen = self.getLength(cspath, tolerance)
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self.scaleCubicSuper(cspath, scaleFactor = scale * (srclen / curveLen), scaleFrom = scaleFrom)
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try: #we wrap this in try-except because if the elements are within groups it will cause errors
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selections[key].set('d', CubicSuperPath(cspath))
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except:
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pass
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else:
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inkex.errormsg("Please select at least one path. You may have to convert the shape to path with path->Object to Path.")
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if __name__ == '__main__':
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ScaleToPathLength().run()
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