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Sourcecode: inkscape version File versions

perspective.py

#!/usr/bin/env 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 
from ffgeom import *
from numpy import *
from numpy.linalg import *

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.debug("Requires two selected paths. The second must be exctly four nodes long.")
            exit()            
            
        #obj is selected second
        obj = self.selected[self.options.ids[0]]
        envelope = self.selected[self.options.ids[1]]
        if (obj.tagName == 'path' or obj.tagName == 'g') and envelope.tagName == 'path':
            path = cubicsuperpath.parsePath(envelope.attributes.getNamedItem('d').value)
            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():
                f = os.popen("inkscape --query-%s --query-id=%s %s" % (query,id,file))
                q[query] = float(f.read())
                f.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)

          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.tagName == "path":
              self.process_path(obj,projmatrix)
          if obj.tagName == "g":
              self.process_group(obj,projmatrix)


    def process_group(self,group,m):
        for node in group.childNodes:
            if node.nodeType==node.ELEMENT_NODE:
                if node.tagName == 'path':
                     self.process_path(node,m)
                if node.tagName == 'g':
                     self.process_group(node,m) 
      

    def process_path(self,path,m):
        d = path.attributes.getNamedItem('d')
        p = cubicsuperpath.parsePath(d.value)
        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)
        d.value = 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])]

e = Project()
e.affect()

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