118 lines
3.5 KiB
Python
118 lines
3.5 KiB
Python
#!/usr/bin/env python
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# These two lines are only needed if you don't put the script directly into
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# the installation directory
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import sys
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sys.path.append('/usr/share/inkscape/extensions')
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import math
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import subprocess #We will call Inkscape to compute the bounding box
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import inkex
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from simplestyle import *
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import simpletransform
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class clonesPerspectiveEffect(inkex.Effect):
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"""
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Creates a series of clones shrinking to a vanishing point.
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The vanishing point is the center of rotation, which must be dragged out to the
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side before invocation.
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"""
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def __init__(self):
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"""
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Constructor.
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Defines the parms option of a script.
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"""
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# Call the base class constructor.
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inkex.Effect.__init__(self)
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# Define string option "--what" with "-w" shortcut and default value "World".
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self.OptionParser.add_option('-n', '--num', action = 'store',
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type = 'int', dest = 'num', default = 5,
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help = 'Drag out center of rotation before calling')
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self.OptionParser.add_option('-r', '--ratio', action = 'store',
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type = 'float', dest = 'ratio', default = 0.9,
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help = 'Ratio of size of nearest neighbor to first. Must be < 1')
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def effect(self):
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"""
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Effect behaviour.
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Overrides base class' method.
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"""
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global boxstring
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global seld
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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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seld = self.selected
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if 1 != len(seld) :
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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 = seld.keys()[0]
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sel = seld[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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thebox = simpletransform.computeBBox([sel])
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width = thebox[1] - thebox[0]
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height = thebox[3] - thebox[2]
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cx = float(thebox[0]) + 0.5 * width #Find center of selected object
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cy = float(thebox[2]) + 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 = self.getParentNode(sel)
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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.uniqueId("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, inkex.etree.Element('use', att) )
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# Create effect instance and apply it.
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effect = clonesPerspectiveEffect()
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effect.affect()
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sys.exit( 0 )
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