1 #!/usr/bin/env python
2 """
3 Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
5 - Voronoi Diagram algorithm and C code by Steven Fortune, 1987, http://ect.bell-labs.com/who/sjf/
6 - Python translation to file voronoi.py by Bill Simons, 2005, http://www.oxfish.com/
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 """
23 import random, inkex, simplestyle, gettext, voronoi
24 _ = gettext.gettext
26 try:
27 from subprocess import Popen, PIPE
28 except:
29 inkex.errormsg(_("Failed to import the subprocess module. Please report this as a bug at : https://bugs.launchpad.net/inkscape."))
30 inkex.errormsg("Python version is : " + str(inkex.sys.version_info))
31 exit()
33 def clip_line(x1, y1, x2, y2, w, h):
34 if x1 < 0 and x2 < 0:
35 return [0, 0, 0, 0]
36 if x1 > w and x2 > w:
37 return [0, 0, 0, 0]
38 if x1 < 0:
39 y1 = (y1*x2 - y2*x1)/(x2 - x1)
40 x1 = 0
41 if x2 < 0:
42 y2 = (y1*x2 - y2*x1)/(x2 - x1)
43 x2 = 0
44 if x1 > w:
45 y1 = y1 + (w - x1)*(y2 - y1)/(x2 - x1)
46 x1 = w
47 if x2 > w:
48 y2 = y1 + (w - x1)*(y2 - y1)/(x2 - x1)
49 x2 = w
50 if y1 < 0 and y2 < 0:
51 return [0, 0, 0, 0]
52 if y1 > h and y2 > h:
53 return [0, 0, 0, 0]
54 if x1 == x2 and y1 == y2:
55 return [0, 0, 0, 0]
56 if y1 < 0:
57 x1 = (x1*y2 - x2*y1)/(y2 - y1)
58 y1 = 0
59 if y2 < 0:
60 x2 = (x1*y2 - x2*y1)/(y2 - y1)
61 y2 = 0
62 if y1 > h:
63 x1 = x1 + (h - y1)*(x2 - x1)/(y2 - y1)
64 y1 = h
65 if y2 > h:
66 x2 = x1 + (h - y1)*(x2 - x1)/(y2 - y1)
67 y2 = h
68 return [x1, y1, x2, y2]
70 class Pattern(inkex.Effect):
71 def __init__(self):
72 inkex.Effect.__init__(self)
73 self.OptionParser.add_option("--size",
74 action="store", type="int",
75 dest="size", default=10,
76 help="Average size of cell (px)")
77 self.OptionParser.add_option("--border",
78 action="store", type="int",
79 dest="border", default=0,
80 help="Size of Border (px)")
82 def effect(self):
83 if not self.options.ids:
84 inkex.errormsg(_("Please select an object"))
85 exit()
86 q = {'x':0,'y':0,'width':0,'height':0} # query the bounding box of ids[0]
87 for query in q.keys():
88 p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query, self.options.ids[0], self.args[-1]), shell=True, stdout=PIPE, stderr=PIPE)
89 rc = p.wait()
90 q[query] = float(p.stdout.read())
91 defs = self.xpathSingle('/svg:svg//svg:defs')
92 pattern = inkex.etree.SubElement(defs ,inkex.addNS('pattern','svg'))
93 pattern.set('id', 'Voronoi' + str(random.randint(1, 9999)))
94 pattern.set('width', str(q['width']))
95 pattern.set('height', str(q['height']))
96 pattern.set('patternTransform', 'translate(%s,%s)' % (q['x'], q['y']))
97 pattern.set('patternUnits', 'userSpaceOnUse')
99 # generate random pattern of points
100 c = voronoi.Context()
101 pts = []
102 b = float(self.options.border) # width of border
103 for i in range(int(q['width']*q['height']/self.options.size/self.options.size)):
104 x = random.random()*q['width']
105 y = random.random()*q['height']
106 if b > 0: # duplicate border area
107 pts.append(voronoi.Site(x, y))
108 if x < b:
109 pts.append(voronoi.Site(x + q['width'], y))
110 if y < b:
111 pts.append(voronoi.Site(x + q['width'], y + q['height']))
112 if y > q['height'] - b:
113 pts.append(voronoi.Site(x + q['width'], y - q['height']))
114 if x > q['width'] - b:
115 pts.append(voronoi.Site(x - q['width'], y))
116 if y < b:
117 pts.append(voronoi.Site(x - q['width'], y + q['height']))
118 if y > q['height'] - b:
119 pts.append(voronoi.Site(x - q['width'], y - q['height']))
120 if y < b:
121 pts.append(voronoi.Site(x, y + q['height']))
122 if y > q['height'] - b:
123 pts.append(voronoi.Site(x, y - q['height']))
124 elif x > -b and y > -b and x < q['width'] + b and y < q['height'] + b:
125 pts.append(voronoi.Site(x, y)) # leave border area blank
126 # dot = inkex.etree.SubElement(pattern, inkex.addNS('rect','svg'))
127 # dot.set('x', str(x-1))
128 # dot.set('y', str(y-1))
129 # dot.set('width', '2')
130 # dot.set('height', '2')
131 if len(pts) < 3:
132 inkex.errormsg("Please choose a larger object, or smaller cell size")
133 exit()
135 # plot Voronoi diagram
136 sl = voronoi.SiteList(pts)
137 voronoi.voronoi(sl, c)
138 for edge in c.edges:
139 if edge[1] >= 0 and edge[2] >= 0: # two vertices
140 [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], q['width'], q['height'])
141 elif edge[1] >= 0: # only one vertex
142 if c.lines[edge[0]][1] == 0: # vertical line
143 xtemp = c.lines[edge[0]][2]/c.lines[edge[0]][0]
144 if c.vertices[edge[1]][1] > q['height']/2:
145 ytemp = q['height']
146 else:
147 ytemp = 0
148 else:
149 xtemp = q['width']
150 ytemp = (c.lines[edge[0]][2] - q['width']*c.lines[edge[0]][0])/c.lines[edge[0]][1]
151 [x1, y1, x2, y2] = clip_line(c.vertices[edge[1]][0], c.vertices[edge[1]][1], xtemp, ytemp, q['width'], q['height'])
152 elif edge[2] >= 0: # only one vertex
153 if c.lines[edge[0]][1] == 0: # vertical line
154 xtemp = c.lines[edge[0]][2]/c.lines[edge[0]][0]
155 if c.vertices[edge[2]][1] > q['height']/2:
156 ytemp = q['height']
157 else:
158 ytemp = 0
159 else:
160 xtemp = 0
161 ytemp = c.lines[edge[0]][2]/c.lines[edge[0]][1]
162 [x1, y1, x2, y2] = clip_line(xtemp, ytemp, c.vertices[edge[2]][0], c.vertices[edge[2]][1], q['width'], q['height'])
163 if x1 or x2 or y1 or y2:
164 path = 'M %f,%f %f,%f' % (x1, y1, x2, y2)
165 attribs = {'d': path, 'style': 'stroke:#000000'}
166 inkex.etree.SubElement(pattern, inkex.addNS('path', 'svg'), attribs)
168 # link selected object to pattern
169 obj = self.selected[self.options.ids[0]]
170 style = {}
171 if obj.attrib.has_key('style'):
172 style = simplestyle.parseStyle(obj.attrib['style'])
173 style['fill'] = 'url(#%s)' % pattern.get('id')
174 obj.attrib['style'] = simplestyle.formatStyle(style)
175 if obj.tag == inkex.addNS('g', 'svg'):
176 for node in obj:
177 style = {}
178 if node.attrib.has_key('style'):
179 style = simplestyle.parseStyle(node.attrib['style'])
180 style['fill'] = 'url(#%s)' % pattern.get('id')
181 node.attrib['style'] = simplestyle.formatStyle(style)
183 if __name__ == '__main__':
184 e = Pattern()
185 e.affect()
187 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99