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mightyscape-0.92-deprecated/extensions/fablabchemnitz_clonesperspective.py
2019-11-14 20:09:28 +01:00

118 lines
3.5 KiB
Python

#!/usr/bin/env python
# These two lines are only needed if you don't put the script directly into
# the installation directory
import sys
sys.path.append('/usr/share/inkscape/extensions')
import math
import subprocess #We will call Inkscape to compute the bounding box
import inkex
from simplestyle import *
import simpletransform
class clonesPerspectiveEffect(inkex.Effect):
"""
Creates a series of clones shrinking to a vanishing point.
The vanishing point is the center of rotation, which must be dragged out to the
side before invocation.
"""
def __init__(self):
"""
Constructor.
Defines the parms option of a script.
"""
# Call the base class constructor.
inkex.Effect.__init__(self)
# Define string option "--what" with "-w" shortcut and default value "World".
self.OptionParser.add_option('-n', '--num', action = 'store',
type = 'int', dest = 'num', default = 5,
help = 'Drag out center of rotation before calling')
self.OptionParser.add_option('-r', '--ratio', action = 'store',
type = 'float', dest = 'ratio', default = 0.9,
help = 'Ratio of size of nearest neighbor to first. Must be < 1')
def effect(self):
"""
Effect behaviour.
Overrides base class' method.
"""
global boxstring
global seld
svg = self.document.getroot()
num = int( self.options.num )
ratio = float( self.options.ratio )
seld = self.selected
if 1 != len(seld) :
inkex.errormsg("Select exactly 1 thing. Group if necessary")
sys.exit (1)
id = seld.keys()[0]
sel = seld[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)
thebox = simpletransform.computeBBox([sel])
width = thebox[1] - thebox[0]
height = thebox[3] - thebox[2]
cx = float(thebox[0]) + 0.5 * width #Find center of selected object
cy = float(thebox[2]) + 0.5 * height #Find center of selected object
tx = float(tx)
ty = float(ty)
crat = 1.0
otx = tx
oty = ty
parent = self.getParentNode(sel)
j = parent.index(sel)
for i in range(num) :
crat *= ratio
tx *= ratio
ty *= ratio
att = {
"id" : self.uniqueId("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, inkex.etree.Element('use', att) )
# Create effect instance and apply it.
effect = clonesPerspectiveEffect()
effect.affect()
sys.exit( 0 )