6cd917e2239ba55c9f071da7fa01674e7f6c5345
1 #!/usr/bin/env python
2 """
3 Copyright (C) 2005 Aaron Spike, aaron@ekips.org
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 Perspective approach & math by Dmitry Platonov, shadowjack@mail.ru, 2006
20 """
21 import sys, inkex, os, re, simplepath, cubicsuperpath
22 import gettext
23 _ = gettext.gettext
24 from ffgeom import *
25 try:
26 from numpy import *
27 from numpy.linalg import *
28 except:
29 inkex.errormsg(_("Failed to import the numpy or numpy.linalg modules. These modules are required by this extension. Please install them and try again. On a Debian-like system this can be done with the command, sudo apt-get install python-numpy."))
30 sys.exit()
32 uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
33 def unittouu(string):
34 unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
35 param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
37 p = param.match(string)
38 u = unit.search(string)
39 if p:
40 retval = float(p.string[p.start():p.end()])
41 else:
42 retval = 0.0
43 if u:
44 try:
45 return retval * uuconv[u.string[u.start():u.end()]]
46 except KeyError:
47 pass
48 return retval
50 class Project(inkex.Effect):
51 def __init__(self):
52 inkex.Effect.__init__(self)
53 def effect(self):
54 if len(self.options.ids) < 2:
55 inkex.errormsg(_("This extension requires two selected paths."))
56 sys.exit()
58 #obj is selected second
59 obj = self.selected[self.options.ids[0]]
60 envelope = self.selected[self.options.ids[1]]
61 if (obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg')) and envelope.tag == inkex.addNS('path','svg'):
62 path = cubicsuperpath.parsePath(envelope.get('d'))
63 if len(path) < 1 or len(path[0]) < 4:
64 inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))
65 sys.exit()
66 dp = zeros((4,2), dtype=float64)
67 for i in range(4):
68 dp[i][0] = path[0][i][1][0]
69 dp[i][1] = path[0][i][1][1]
71 #query inkscape about the bounding box of obj
72 q = {'x':0,'y':0,'width':0,'height':0}
73 file = self.args[-1]
74 id = self.options.ids[0]
75 for query in q.keys():
76 f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
77 q[query] = float(f.read())
78 f.close()
79 err.close()
80 sp = array([[q['x'], q['y']+q['height']],[q['x'], q['y']],[q['x']+q['width'], q['y']],[q['x']+q['width'], q['y']+q['height']]], dtype=float64)
82 solmatrix = zeros((8,8), dtype=float64)
83 free_term = zeros((8), dtype=float64)
84 for i in (0,1,2,3):
85 solmatrix[i][0] = sp[i][0]
86 solmatrix[i][1] = sp[i][1]
87 solmatrix[i][2] = 1
88 solmatrix[i][6] = -dp[i][0]*sp[i][0]
89 solmatrix[i][7] = -dp[i][0]*sp[i][1]
90 solmatrix[i+4][3] = sp[i][0]
91 solmatrix[i+4][4] = sp[i][1]
92 solmatrix[i+4][5] = 1
93 solmatrix[i+4][6] = -dp[i][1]*sp[i][0]
94 solmatrix[i+4][7] = -dp[i][1]*sp[i][1]
95 free_term[i] = dp[i][0]
96 free_term[i+4] = dp[i][1]
98 res = solve(solmatrix, free_term)
99 projmatrix = array([[res[0],res[1],res[2]],[res[3],res[4],res[5]],[res[6],res[7],1.0]],dtype=float64)
100 if obj.tag == inkex.addNS("path",'svg'):
101 self.process_path(obj,projmatrix)
102 if obj.tag == inkex.addNS("g",'svg'):
103 self.process_group(obj,projmatrix)
106 def process_group(self,group,m):
107 for node in group:
108 if node.tag == inkex.addNS('path','svg'):
109 self.process_path(node,m)
110 if node.tag == inkex.addNS('g','svg'):
111 self.process_group(node,m)
114 def process_path(self,path,m):
115 d = path.get('d')
116 p = cubicsuperpath.parsePath(d)
117 for subs in p:
118 for csp in subs:
119 csp[0] = self.project_point(csp[0],m)
120 csp[1] = self.project_point(csp[1],m)
121 csp[2] = self.project_point(csp[2],m)
122 path.set('d',cubicsuperpath.formatPath(p))
126 def project_point(self,p,m):
127 x = p[0]
128 y = p[1]
129 return [(x*m[0][0] + y*m[0][1] + m[0][2])/(x*m[2][0]+y*m[2][1]+m[2][2]),(x*m[1][0] + y*m[1][1] + m[1][2])/(x*m[2][0]+y*m[2][1]+m[2][2])]
131 if __name__ == '__main__':
132 e = Project()
133 e.affect()
136 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99