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mightyscape-1.1-deprecated/extensions/fablabchemnitz_clonesperspective.py

73 lines
2.6 KiB
Python

#!/usr/bin/env python3
import sys
import math
import inkex
from lxml import etree
class clonesPerspectiveEffect(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.arg_parser.add_argument('--num', type = int, default = 5, help = 'Drag out center of rotation before calling')
self.arg_parser.add_argument('--ratio', type = float, default = 0.9, help = 'Ratio of size of nearest neighbor to first. Must be < 1')
def effect(self):
svg = self.document.getroot()
num = int( self.options.num )
ratio = float( self.options.ratio)
if 1 != len(self.svg.selected) :
inkex.errormsg("Select exactly 1 thing. Group if necessary")
sys.exit(1)
id = self.svg.selected[0].get('id')
sel = self.svg.selected[id]
dic = sel.attrib
try :
tx = dic[inkex.addNS('transform-center-x','inkscape') ]
except KeyError :
tx = '0.'
try :
ty = dic[inkex.addNS('transform-center-y','inkscape') ]
except KeyError :
ty = '0.'
if float(tx) == 0. and float(ty) == 0. :
inkex.errormsg("Center of rotation at center of object")
sys.exit(1)
for node in sel:
width = node.bounding_box().right - node.bounding_box().left
height = node.bounding_box().bottom - node.bounding_box().top
cx = float(node.bounding_box().left) + 0.5 * width #Find center of selected object
cy = float(node.bounding_box().top) + 0.5 * height #Find center of selected object
tx = float(tx)
ty = float(ty)
crat = 1.0
otx = tx
oty = ty
parent = sel.getparent()
j = parent.index(sel)
for i in range(num) :
crat *= ratio
tx *= ratio
ty *= ratio
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),
# "x" : "0",
# "y" : "0",
'transform' : ("matrix(%f,0,0,%f,%f,%f)" %
(crat, crat,(1. - crat)*(cx + otx),
(1. - crat)*(cy - oty))),
#WHY Inkscape and SVG run +y in OPPOSITE directions is BEYOND me.
"width" : "100%",
"height" : "100%",
}
parent.insert(j, etree.Element('use', att) )
# Create effect instance and apply it.
clonesPerspectiveEffect().run()