90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
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#!/usr/bin/env python3
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'''
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Mutual Cut Line
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This Inkscape extension will take 2 selected line and cut them both
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at their intersection point.
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Only the first segment of a multi-segment line will be used.
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'''
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import inkex
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from inkex.paths import Path
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from math import *
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from lxml import etree
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def error(message):
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inkex.errormsg(message)
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exit()
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class MutualCutLine(inkex.EffectExtension):
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def effect(self):
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if len(self.svg.selected.items()) != 2:
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error('Please select 2 lines before running this effect.')
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line = []
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numPaths = 0
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for id, path in self.svg.selected.items():
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if path.tag == inkex.addNS('path','svg'):
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numPaths += 1
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style = path.get('style')
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np = [style]
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p = Path(path.get('d')).to_arrays()
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for sp in p:
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np.append([sp[1][0], sp[1][1]])
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line.append(np)
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path.getparent().remove(path) #after cutting we remove the original lines
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if numPaths != 2:
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error('Please select 2 lines before running this effect.')
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# Extract style and points for the first 2 line segments.
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astyle = line[0][0]
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bstyle = line[1][0]
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a1x = line[0][1][0]
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a1y = line[0][1][1]
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a2x = line[0][2][0]
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a2y = line[0][2][1]
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b1x = line[1][1][0]
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b1y = line[1][1][1]
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b2x = line[1][2][0]
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b2y = line[1][2][1]
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# Calculate intersection point.
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adx = a1x - a2x
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ady = a1y - a2y
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bdx = b1x - b2x
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bdy = b1y - b2y
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denom = adx * bdy - ady * bdx
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numa = (a1x * a2y - a1y * a2x)
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numb = (b1x * b2y - b1y * b2x)
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x_num = numa * bdx - numb * adx
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y_num = numa * bdy - numb * ady
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if denom == 0:
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error('Lines don\'t intersect in a single point.')
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x = x_num / denom
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y = y_num / denom
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# TODO: Verify that the 2 segments intersect.
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# Current code will connect outside the line segments.
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# Create 4 line segments from the intersection point.
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svg_path = inkex.addNS('path','svg')
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sega1 = etree.SubElement(self.svg.get_current_layer(), svg_path)
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sega1.set('d', 'M '+str(x)+','+str(y)+' L '+str(a1x)+','+str(a1y))
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sega1.set('style', astyle)
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sega2 = etree.SubElement(self.svg.get_current_layer(), svg_path)
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sega2.set('d', 'M '+str(x)+','+str(y)+' L '+str(a2x)+','+str(a2y))
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sega2.set('style', astyle)
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segb1 = etree.SubElement(self.svg.get_current_layer(), svg_path)
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segb1.set('d', 'M '+str(x)+','+str(y)+' L '+str(b1x)+','+str(b1y))
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segb1.set('style', bstyle)
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segb2 = etree.SubElement(self.svg.get_current_layer(), svg_path)
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segb2.set('d', 'M '+str(x)+','+str(y)+' L '+str(b2x)+','+str(b2y))
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segb2.set('style', bstyle)
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if __name__ == '__main__':
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MutualCutLine().run()
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