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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
#
# - Voronoi Diagram algorithm and C code by Steven Fortune, 1987, http://ect.bell-labs.com/who/sjf/
# - Python translation to file voronoi.py by Bill Simons, 2005, http://www.oxfish.com/
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import random
import inkex
from inkex import PathElement, Pattern
import voronoi
def clip_line(x1, y1, x2, y2, w, h):
if x1 < 0 and x2 < 0:
return [0, 0, 0, 0]
if x1 > w and x2 > w:
return [0, 0, 0, 0]
if x1 < 0:
y1 = (y1 * x2 - y2 * x1) / (x2 - x1)
x1 = 0
if x2 < 0:
y2 = (y1 * x2 - y2 * x1) / (x2 - x1)
x2 = 0
if x1 > w:
y1 = y1 + (w - x1) * (y2 - y1) / (x2 - x1)
x1 = w
if x2 > w:
y2 = y1 + (w - x1) * (y2 - y1) / (x2 - x1)
x2 = w
if y1 < 0 and y2 < 0:
return [0, 0, 0, 0]
if y1 > h and y2 > h:
return [0, 0, 0, 0]
if x1 == x2 and y1 == y2:
return [0, 0, 0, 0]
if y1 < 0:
x1 = (x1 * y2 - x2 * y1) / (y2 - y1)
y1 = 0
if y2 < 0:
x2 = (x1 * y2 - x2 * y1) / (y2 - y1)
y2 = 0
if y1 > h:
x1 = x1 + (h - y1) * (x2 - x1) / (y2 - y1)
y1 = h
if y2 > h:
x2 = x1 + (h - y1) * (x2 - x1) / (y2 - y1)
y2 = h
return [x1, y1, x2, y2]
class GenerateVoronoi(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument("--tab")
pars.add_argument(
"--size", type=int, default=10, help="Average size of cell (px)"
)
pars.add_argument("--border", type=int, default=0, help="Size of Border (px)")
def effect(self):
if not self.options.ids:
return inkex.errormsg(_("Please select an object"))
scale = self.svg.unittouu("1px") # convert to document units
self.options.size *= scale
self.options.border *= scale
obj = self.svg.selection.first()
bbox = obj.bounding_box()
mat = obj.composed_transform().matrix
pattern = self.svg.defs.add(Pattern())
pattern.set_random_id("Voronoi")
pattern.set("width", str(bbox.width))
pattern.set("height", str(bbox.height))
pattern.set("patternUnits", "userSpaceOnUse")
pattern.patternTransform.add_translate(
bbox.left - mat[0][2], bbox.top - mat[1][2]
)
# generate random pattern of points
c = voronoi.Context()
pts = []
b = float(self.options.border) # width of border
for i in range(
int(bbox.width * bbox.height / self.options.size / self.options.size)
):
x = random.random() * bbox.width
y = random.random() * bbox.height
if b > 0: # duplicate border area
pts.append(voronoi.Site(x, y))
if x < b:
pts.append(voronoi.Site(x + bbox.width, y))
if y < b:
pts.append(voronoi.Site(x + bbox.width, y + bbox.height))
if y > bbox.height - b:
pts.append(voronoi.Site(x + bbox.width, y - bbox.height))
if x > bbox.width - b:
pts.append(voronoi.Site(x - bbox.width, y))
if y < b:
pts.append(voronoi.Site(x - bbox.width, y + bbox.height))
if y > bbox.height - b:
pts.append(voronoi.Site(x - bbox.width, y - bbox.height))
if y < b:
pts.append(voronoi.Site(x, y + bbox.height))
if y > bbox.height - b:
pts.append(voronoi.Site(x, y - bbox.height))
elif x > -b and y > -b and x < bbox.width + b and y < bbox.height + b:
pts.append(voronoi.Site(x, y)) # leave border area blank
# dot = pattern.add(inkex.Rectangle())
# dot.set('x', str(x-1))
# dot.set('y', str(y-1))
# dot.set('width', '2')
# dot.set('height', '2')
if len(pts) < 3:
return inkex.errormsg("Please choose a larger object, or smaller cell size")
# plot Voronoi diagram
sl = voronoi.SiteList(pts)
voronoi.voronoi(sl, c)
path = ""
for edge in c.edges:
if edge[1] >= 0 and edge[2] >= 0: # two vertices
[x1, y1, x2, y2] = clip_line(
c.vertices[edge[1]][0],
c.vertices[edge[1]][1],
c.vertices[edge[2]][0],
c.vertices[edge[2]][1],
bbox.width,
bbox.height,
)
elif edge[1] >= 0: # only one vertex
if c.lines[edge[0]][1] == 0: # vertical line
xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
if c.vertices[edge[1]][1] > bbox.height / 2:
ytemp = bbox.height
else:
ytemp = 0
else:
xtemp = bbox.width
ytemp = (
c.lines[edge[0]][2] - bbox.width * c.lines[edge[0]][0]
) / c.lines[edge[0]][1]
[x1, y1, x2, y2] = clip_line(
c.vertices[edge[1]][0],
c.vertices[edge[1]][1],
xtemp,
ytemp,
bbox.width,
bbox.height,
)
elif edge[2] >= 0: # only one vertex
if edge[0] >= len(c.lines):
xtemp = 0
ytemp = 0
elif c.lines[edge[0]][1] == 0: # vertical line
xtemp = c.lines[edge[0]][2] / c.lines[edge[0]][0]
if c.vertices[edge[2]][1] > bbox.height / 2:
ytemp = bbox.height
else:
ytemp = 0
else:
xtemp = 0
ytemp = c.lines[edge[0]][2] / c.lines[edge[0]][1]
[x1, y1, x2, y2] = clip_line(
xtemp,
ytemp,
c.vertices[edge[2]][0],
c.vertices[edge[2]][1],
bbox.width,
bbox.height,
)
if x1 or x2 or y1 or y2:
path += "M %.3f,%.3f %.3f,%.3f " % (x1, y1, x2, y2)
patternstyle = {"stroke": "#000000", "stroke-width": str(scale)}
attribs = {"d": path, "style": str(inkex.Style(patternstyle))}
pattern.append(PathElement(**attribs))
# link selected object to pattern
obj.style["fill"] = pattern
if isinstance(obj, inkex.Group):
for node in obj:
node.style["fill"] = pattern
if __name__ == "__main__":
GenerateVoronoi().run()
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