mightyscape-1.2/extensions/fablabchemnitz/zigzag_nodes/zigzag_nodes.py

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#!/usr/bin/env python3
'''
zigzag.py
Sunabe kazumichi 2009/9/29
http://dp48069596.lolipop.jp/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
this program shifts the nodes zigzags.
'''
import random
import math
import inkex
from inkex import CubicSuperPath
def pointdistance(x1, y1, x2, y2):
dist=math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2))
if dist==0:
dx=0
dy=0
else:
dx=(x2 - x1)/dist
dy=(y2 - y1)/dist
return dx,dy
def randomize(x,y, r):
if y == 0:
a = math.pi
elif x == 0 and y != 0:
a = math.pi/2
else:
a = math.atan2(y,x)
x = math.cos(a-math.pi/2)*r
y = math.sin(a-math.pi/2)*r
return [x, y]
class ZigzagNodes(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument("--title")
pars.add_argument("--radius", type=float, default=10.0, help="Randomly move control and end points in this radius")
def effect(self):
for id, node in self.svg.selected.items():
if node.tag == inkex.addNS('path','svg'):
d = node.get('d')
p = CubicSuperPath(d)
for subpath in p:
for i, csp in enumerate(subpath):
if i % 2 != 0:
dx,dy=pointdistance(csp[0][0], csp[0][1], csp[1][0], csp[1][1])
delta=randomize(dx, dy, self.options.radius)
csp[0][0]+=delta[0]
csp[0][1]+=delta[1]
csp[1][0]+=delta[0]
csp[1][1]+=delta[1]
csp[2][0]+=delta[0]
csp[2][1]+=delta[1]
else:
dx,dy=pointdistance(csp[0][0], csp[0][1], csp[1][0], csp[1][1])
delta=randomize(dx, dy, self.options.radius)
csp[0][0]-=delta[0]
csp[0][1]-=delta[1]
csp[1][0]-=delta[0]
csp[1][1]-=delta[1]
csp[2][0]-=delta[0]
csp[2][1]-=delta[1]
node.set('d', CubicSuperPath(p))
if __name__ == '__main__':
ZigzagNodes().run()