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

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#!/usr/bin/env python3
import sys
import math
import inkex
from lxml import etree
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class clonesPerspectiveEffect(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument('--num', type = int, default = 5, help = 'Drag out center of rotation before calling')
pars.add_argument('--ratio', type = float, default = 0.9, help = 'Ratio of size of nearest neighbor to first. Must be < 1')
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def effect(self):
if len(self.svg.selected) != 1:
inkex.errormsg("Select exactly 1 thing. If necessary, group your items before.")
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sys.exit(1)
xpath = list(self.svg.selected.items())[0][0]
sel = self.svg.selected[xpath]
id = sel.get('id')
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try :
tx = sel.attrib[inkex.addNS('transform-center-x','inkscape')]
except KeyError:
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tx = '0.'
try :
ty = sel.attrib[inkex.addNS('transform-center-y','inkscape')]
except KeyError:
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ty = '0.'
if float(tx) == 0. and float(ty) == 0. :
inkex.errormsg("Center of rotation ist at the center of object. Please move the center first.")
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sys.exit(1)
bbox = sel.bounding_box()
width = bbox.height
height = bbox.width
cx = float(bbox.left) + 0.5 * width #Find center of selected object
cy = float(bbox.top) + 0.5 * height #Find center of selected object
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tx = float(tx)
ty = float(ty)
crat = 1.0
otx = tx
oty = ty
parent = sel.getparent()
j = parent.index(sel)
for i in range(self.options.num) :
crat *= self.options.ratio
tx *= self.options.ratio
ty *= self.options.ratio
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att = {
"id" : self.svg.get_unique_id("clone" + id),
inkex.addNS('href','xlink') : "#" + id,
inkex.addNS('transform-center-x','inkscape') : str(tx),
inkex.addNS('transform-center-y','inkscape') : str(ty),
'transform' : ("matrix(%f,0,0,%f,%f,%f)" % (crat, crat,(1. - crat)*(cx + otx), (1. - crat)*(cy - oty))),
"width" : "100%",
"height" : "100%",
}
parent.insert(j, etree.Element('use', att))
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if __name__ == '__main__':
clonesPerspectiveEffect().run()