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