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Copyright (C) 2005 Aaron Spike, aaron@ekips.org
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Perspective approach & math by Dmitry Platonov, shadowjack@mail.ru, 2006
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import sys, inkex, os, re, simplepath, cubicsuperpath
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from numpy.linalg import *
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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."))
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from subprocess import Popen, PIPE
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uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
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unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
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param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
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p = param.match(string)
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u = unit.search(string)
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retval = float(p.string[p.start():p.end()])
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return retval * uuconv[u.string[u.start():u.end()]]
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class Project(inkex.Effect):
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inkex.Effect.__init__(self)
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if len(self.options.ids) < 2:
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inkex.errormsg(_("This extension requires two selected paths."))
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#obj is selected second
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obj = self.selected[self.options.ids[0]]
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envelope = self.selected[self.options.ids[1]]
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if obj.get(inkex.addNS('type','sodipodi')):
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inkex.errormsg(_("The first selected object is of type '%s'.\nTry using the procedure Path | Object to Path." % obj.get(inkex.addNS('type','sodipodi'))))
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if obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg'):
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if envelope.tag == inkex.addNS('path','svg'):
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path = cubicsuperpath.parsePath(envelope.get('d'))
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if len(path) < 1 or len(path[0]) < 4:
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inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))
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dp = zeros((4,2), dtype=float64)
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dp[i][0] = path[0][i][1][0]
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dp[i][1] = path[0][i][1][1]
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#query inkscape about the bounding box of obj
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q = {'x':0,'y':0,'width':0,'height':0}
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id = self.options.ids[0]
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for query in q.keys():
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p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query,id,file), shell=True, stdout=PIPE, stderr=PIPE)
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q[query] = float(p.stdout.read())
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f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
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q[query] = float(f.read())
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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)
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if envelope.tag == inkex.addNS('g','svg'):
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inkex.errormsg(_("The second selected object is a group, not a path.\nTry using the procedure Object | Ungroup."))
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inkex.errormsg(_("The second selected object is not a path.\nTry using the procedure Path | Object to Path."))
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inkex.errormsg(_("The first selected object is not a path.\nTry using the procedure Path | Object to Path."))
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solmatrix = zeros((8,8), dtype=float64)
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free_term = zeros((8), dtype=float64)
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solmatrix[i][0] = sp[i][0]
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solmatrix[i][1] = sp[i][1]
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solmatrix[i][6] = -dp[i][0]*sp[i][0]
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solmatrix[i][7] = -dp[i][0]*sp[i][1]
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solmatrix[i+4][3] = sp[i][0]
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solmatrix[i+4][4] = sp[i][1]
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solmatrix[i+4][5] = 1
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solmatrix[i+4][6] = -dp[i][1]*sp[i][0]
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solmatrix[i+4][7] = -dp[i][1]*sp[i][1]
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free_term[i] = dp[i][0]
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free_term[i+4] = dp[i][1]
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res = solve(solmatrix, free_term)
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projmatrix = array([[res[0],res[1],res[2]],[res[3],res[4],res[5]],[res[6],res[7],1.0]],dtype=float64)
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if obj.tag == inkex.addNS("path",'svg'):
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self.process_path(obj,projmatrix)
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if obj.tag == inkex.addNS("g",'svg'):
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self.process_group(obj,projmatrix)
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def process_group(self,group,m):
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if node.tag == inkex.addNS('path','svg'):
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self.process_path(node,m)
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if node.tag == inkex.addNS('g','svg'):
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self.process_group(node,m)
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def process_path(self,path,m):
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p = cubicsuperpath.parsePath(d)
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csp[0] = self.project_point(csp[0],m)
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csp[1] = self.project_point(csp[1],m)
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csp[2] = self.project_point(csp[2],m)
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path.set('d',cubicsuperpath.formatPath(p))
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def project_point(self,p,m):
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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])]
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if __name__ == '__main__':
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# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99