/usr/share/inkscape/extensions/perspective.py is in inkscape 0.48.5-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | #! /usr/bin/python
"""
Copyright (C) 2005 Aaron Spike, aaron@ekips.org
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
Perspective approach & math by Dmitry Platonov, shadowjack@mail.ru, 2006
"""
import sys, inkex, os, re, simplepath, cubicsuperpath, simpletransform, voronoi2svg
import gettext
_ = gettext.gettext
from ffgeom import *
try:
from numpy import *
from numpy.linalg import *
except:
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."))
exit()
try:
from subprocess import Popen, PIPE
bsubprocess = True
except:
bsubprocess = False
uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
def unittouu(string):
unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
p = param.match(string)
u = unit.search(string)
if p:
retval = float(p.string[p.start():p.end()])
else:
retval = 0.0
if u:
try:
return retval * uuconv[u.string[u.start():u.end()]]
except KeyError:
pass
return retval
class Project(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
def effect(self):
if len(self.options.ids) < 2:
inkex.errormsg(_("This extension requires two selected paths."))
exit()
#obj is selected second
obj = self.selected[self.options.ids[0]]
envelope = self.selected[self.options.ids[1]]
if obj.get(inkex.addNS('type','sodipodi')):
inkex.errormsg(_("The first selected object is of type '%s'.\nTry using the procedure Path->Object to Path." % obj.get(inkex.addNS('type','sodipodi'))))
exit()
if obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg'):
if envelope.tag == inkex.addNS('path','svg'):
mat = simpletransform.composeParents(envelope, [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]])
path = cubicsuperpath.parsePath(envelope.get('d'))
if len(path) < 1 or len(path[0]) < 4:
inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))
exit()
simpletransform.applyTransformToPath(mat, path)
dp = zeros((4,2), dtype=float64)
for i in range(4):
dp[i][0] = path[0][i][1][0]
dp[i][1] = path[0][i][1][1]
#query inkscape about the bounding box of obj
q = {'x':0,'y':0,'width':0,'height':0}
file = self.args[-1]
id = self.options.ids[0]
for query in q.keys():
if bsubprocess:
p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query,id,file), shell=True, stdout=PIPE, stderr=PIPE)
rc = p.wait()
q[query] = float(p.stdout.read())
err = p.stderr.read()
else:
f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
q[query] = float(f.read())
f.close()
err.close()
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)
else:
if envelope.tag == inkex.addNS('g','svg'):
inkex.errormsg(_("The second selected object is a group, not a path.\nTry using the procedure Object->Ungroup."))
else:
inkex.errormsg(_("The second selected object is not a path.\nTry using the procedure Path->Object to Path."))
exit()
else:
inkex.errormsg(_("The first selected object is not a path.\nTry using the procedure Path->Object to Path."))
exit()
solmatrix = zeros((8,8), dtype=float64)
free_term = zeros((8), dtype=float64)
for i in (0,1,2,3):
solmatrix[i][0] = sp[i][0]
solmatrix[i][1] = sp[i][1]
solmatrix[i][2] = 1
solmatrix[i][6] = -dp[i][0]*sp[i][0]
solmatrix[i][7] = -dp[i][0]*sp[i][1]
solmatrix[i+4][3] = sp[i][0]
solmatrix[i+4][4] = sp[i][1]
solmatrix[i+4][5] = 1
solmatrix[i+4][6] = -dp[i][1]*sp[i][0]
solmatrix[i+4][7] = -dp[i][1]*sp[i][1]
free_term[i] = dp[i][0]
free_term[i+4] = dp[i][1]
res = solve(solmatrix, free_term)
projmatrix = array([[res[0],res[1],res[2]],[res[3],res[4],res[5]],[res[6],res[7],1.0]],dtype=float64)
if obj.tag == inkex.addNS("path",'svg'):
self.process_path(obj,projmatrix)
if obj.tag == inkex.addNS("g",'svg'):
self.process_group(obj,projmatrix)
def process_group(self,group,m):
for node in group:
if node.tag == inkex.addNS('path','svg'):
self.process_path(node,m)
if node.tag == inkex.addNS('g','svg'):
self.process_group(node,m)
def process_path(self,path,m):
mat = simpletransform.composeParents(path, [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]])
d = path.get('d')
p = cubicsuperpath.parsePath(d)
simpletransform.applyTransformToPath(mat, p)
for subs in p:
for csp in subs:
csp[0] = self.project_point(csp[0],m)
csp[1] = self.project_point(csp[1],m)
csp[2] = self.project_point(csp[2],m)
mat = voronoi2svg.Voronoi2svg().invertTransform(mat)
simpletransform.applyTransformToPath(mat, p)
path.set('d',cubicsuperpath.formatPath(p))
def project_point(self,p,m):
x = p[0]
y = p[1]
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])]
if __name__ == '__main__':
e = Project()
e.affect()
# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
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