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mightyscape-1.1-deprecated/extensions/fablabchemnitz/fablabchemnitz_paste_length.py

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#!/usr/bin/env python3
'''
Inkscape extension to copy length of the source path to the selected
destination path(s)
Copyright (C) 2018 Shrinivas Kulkarni
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.
'''
import inkex
from inkex import bezier
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from inkex.paths import Path, CubicSuperPath
class PasteLengthEffect(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.arg_parser.add_argument('--scale', type = float, default = '1', help = 'Additionally scale the length by')
self.arg_parser.add_argument('--scaleFrom', default = 'center', help = 'Scale Path From')
self.arg_parser.add_argument('--precision', type = int, default = '5', help = 'Number of significant digits')
self.arg_parser.add_argument("--tab", default="sampling", help="Tab")
def scaleCubicSuper(self, cspath, scaleFactor, scaleFrom):
bbox = Path(cspath).bounding_box()
if(scaleFrom == 'topLeft'):
oldOrigin= [bbox.left, bbox.bottom]
elif(scaleFrom == 'topRight'):
oldOrigin= [bbox.right, bbox.bottom]
elif(scaleFrom == 'bottomLeft'):
oldOrigin= [bbox.left, bbox.top]
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elif(scaleFrom == 'bottomRight'):
oldOrigin= [bbox.right, bbox.top]
else: #if(scaleFrom == 'center'):
oldOrigin= [bbox.left + (bbox.right - bbox.left) / 2., bbox.bottom + (bbox.top - bbox.bottom) / 2.]
newOrigin = [oldOrigin[0] * scaleFactor , oldOrigin[1] * scaleFactor ]
for subpath in cspath:
for bezierPt in subpath:
for i in range(0, len(bezierPt)):
bezierPt[i] = [bezierPt[i][0] * scaleFactor,
bezierPt[i][1] * scaleFactor]
bezierPt[i][0] += (oldOrigin[0] - newOrigin[0])
bezierPt[i][1] += (oldOrigin[1] - newOrigin[1])
def getPartsFromCubicSuper(self, cspath):
parts = []
for subpath in cspath:
part = []
prevBezPt = None
for i, bezierPt in enumerate(subpath):
if(prevBezPt != None):
seg = [prevBezPt[1], prevBezPt[2], bezierPt[0], bezierPt[1]]
part.append(seg)
prevBezPt = bezierPt
parts.append(part)
return parts
def getLength(self, cspath, tolerance):
parts = self.getPartsFromCubicSuper(cspath)
curveLen = 0
for i, part in enumerate(parts):
for j, seg in enumerate(part):
curveLen += bezier.bezierlength((seg[0], seg[1], seg[2], seg[3]), tolerance = tolerance)
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return curveLen
def effect(self):
scale = self.options.scale
scaleFrom = self.options.scaleFrom
tolerance = 10 ** (-1 * self.options.precision)
selections = self.svg.selected
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pathNodes = self.document.xpath('//svg:path',namespaces=inkex.NSS)
outStrs = [str(len(pathNodes))]
paths = [(pathNode.get('id'), CubicSuperPath(pathNode.get('d'))) for pathNode in pathNodes]
if(len(paths) > 1):
srcPath = paths[-1][1]
srclen = self.getLength(srcPath, tolerance)
paths = paths[:len(paths)-1]
for key, cspath in paths:
curveLen = self.getLength(cspath, tolerance)
self.scaleCubicSuper(cspath, scaleFactor = scale * (srclen / curveLen), scaleFrom = scaleFrom)
try: #we wrap this in try-except because if the elements are within groups it will cause errors
selections[key].set('d', CubicSuperPath(cspath))
except:
pass
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else:
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inkex.errormsg("Please select at least two paths, with the path whose \
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length is to be copied at the top. You may have to convert the shape \
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to path with path->Object to Path.")
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PasteLengthEffect().run()