73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
#!/usr/bin/env python3
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import sys
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import math
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import inkex
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from lxml import etree
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class clonesPerspectiveEffect(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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self.arg_parser.add_argument('--num', type = int, default = 5, help = 'Drag out center of rotation before calling')
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self.arg_parser.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):
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svg = self.document.getroot()
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num = int( self.options.num )
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ratio = float( self.options.ratio)
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if 1 != len(self.svg.selected) :
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inkex.errormsg("Select exactly 1 thing. Group if necessary")
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sys.exit(1)
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id = self.svg.selected[0].get('id')
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sel = self.svg.selected[id]
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dic = sel.attrib
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try :
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tx = dic[inkex.addNS('transform-center-x','inkscape') ]
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except KeyError :
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tx = '0.'
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try :
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ty = dic[inkex.addNS('transform-center-y','inkscape') ]
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except KeyError :
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ty = '0.'
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if float(tx) == 0. and float(ty) == 0. :
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inkex.errormsg("Center of rotation at center of object")
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sys.exit(1)
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for node in sel:
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width = node.bounding_box().right - node.bounding_box().left
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height = node.bounding_box().bottom - node.bounding_box().top
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cx = float(node.bounding_box().left) + 0.5 * width #Find center of selected object
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cy = float(node.bounding_box().top) + 0.5 * height #Find center of selected object
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tx = float(tx)
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ty = float(ty)
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crat = 1.0
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otx = tx
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oty = ty
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parent = sel.getparent()
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j = parent.index(sel)
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for i in range(num) :
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crat *= ratio
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tx *= ratio
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ty *= ratio
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att = {
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"id" : self.svg.get_unique_id("clone" + id),
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inkex.addNS('href','xlink') : "#" + id,
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inkex.addNS('transform-center-x','inkscape') : str(tx),
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inkex.addNS('transform-center-y','inkscape') : str(ty),
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# "x" : "0",
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# "y" : "0",
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'transform' : ("matrix(%f,0,0,%f,%f,%f)" %
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(crat, crat,(1. - crat)*(cx + otx),
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(1. - crat)*(cy - oty))),
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#WHY Inkscape and SVG run +y in OPPOSITE directions is BEYOND me.
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"width" : "100%",
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"height" : "100%",
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}
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parent.insert(j, etree.Element('use', att) )
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# Create effect instance and apply it.
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clonesPerspectiveEffect().run() |