import math, inkex, simplepath, sys

def pointAtPercent((x1, y1), (x2, y2), percent):

percent /= 100.0

x = x1 + (percent * (x2 - x1))

y = y1 + (percent * (y2 - y1))

return [x,y]

class SegmentStraightener(inkex.Effect):

def __init__(self):

inkex.Effect.__init__(self)

self.OptionParser.add_option("-p", "--percent",

action="store", type="float",

dest="percent", default=10.0,

help="move curve handles PERCENT percent closer to a straight line")

self.OptionParser.add_option("-b", "--behavior",

action="store", type="int",

dest="behave", default=1,

help="straightening behavior for cubic segments")

def effect(self):

for id, node in self.selected.iteritems():

if node.tag == inkex.addNS('path', 'svg'):

d = node.get('d')

p = simplepath.parsePath(d)

last = []

subPathStart = []

for cmd,params in p:

if cmd == 'C':

if self.options.behave <= 1:

#shorten handles towards end points

params[:2] = pointAtPercent(params[:2],last[:],self.options.percent)

params[2:4] = pointAtPercent(params[2:4],params[-2:],self.options.percent)

else:

#shorten handles towards thirds of the segment

dest1 = pointAtPercent(last[:],params[-2:],33.3)

dest2 = pointAtPercent(params[-2:],last[:],33.3)

params[:2] = pointAtPercent(params[:2],dest1[:],self.options.percent)

params[2:4] = pointAtPercent(params[2:4],dest2[:],self.options.percent)

elif cmd == 'Q':

dest = pointAtPercent(last[:],params[-2:],50)

params[:2] = pointAtPercent(params[:2],dest,self.options.percent)

if cmd == 'M':

subPathStart = params[-2:]

if cmd == 'Z':

last = subPathStart[:]

else:

last = params[-2:]

node.set('d',simplepath.formatPath(p))

if __name__ == '__main__':

e = SegmentStraightener()

e.affect()