share/extensions/summersnight.py

   1 #!/usr/bin/env python
   2 """
   3 Copyright (C) 2005 Aaron Spike, aaron@ekips.org
   4
   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.
   9
  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.
  14
  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
  18
  19 """
  20 import inkex, os, simplepath, cubicsuperpath
  21 from ffgeom import *
  22 import gettext
  23 _ = gettext.gettext
  24
  25 try:
  26     from subprocess import Popen, PIPE
  27     bsubprocess = True
  28 except:
  29     bsubprocess = False
  30
  31 class Project(inkex.Effect):
  32     def __init__(self):
  33             inkex.Effect.__init__(self)
  34     def effect(self):
  35         if len(self.options.ids) < 2:
  36             inkex.errormsg(_("This extension requires two selected paths. \nThe second path must be exactly four nodes long."))
  37             exit()
  38
  39         #obj is selected second
  40         obj = self.selected[self.options.ids[0]]
  41         trafo = self.selected[self.options.ids[1]]
  42         if obj.get(inkex.addNS('type','sodipodi')):
  43             inkex.errormsg(_("The first selected object is of type '%s'.\nTry using the procedure Path->Object to Path." % obj.get(inkex.addNS('type','sodipodi'))))
  44             exit()
  45         if obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg'):
  46             if trafo.tag == inkex.addNS('path','svg'):
  47                 #distil trafo into four node points
  48                 trafo = cubicsuperpath.parsePath(trafo.get('d'))
  49                 if len(trafo[0]) < 4:
  50                     inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))
  51                     exit()
  52                 trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]
  53
  54                 #vectors pointing away from the trafo origin
  55                 self.t1 = Segment(trafo[0],trafo[1])
  56                 self.t2 = Segment(trafo[1],trafo[2])
  57                 self.t3 = Segment(trafo[3],trafo[2])
  58                 self.t4 = Segment(trafo[0],trafo[3])
  59
  60                 #query inkscape about the bounding box of obj
  61                 self.q = {'x':0,'y':0,'width':0,'height':0}
  62                 file = self.args[-1]
  63                 id = self.options.ids[0]
  64                 for query in self.q.keys():
  65                     if bsubprocess:
  66                         p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query,id,file), shell=True, stdout=PIPE, stderr=PIPE)
  67                         rc = p.wait()
  68                         self.q[query] = float(p.stdout.read())
  69                         err = p.stderr.read()
  70                     else:
  71                         f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
  72                         self.q[query] = float(f.read())
  73                         f.close()
  74                         err.close()
  75
  76                 if obj.tag == inkex.addNS("path",'svg'):
  77                     self.process_path(obj)
  78                 if obj.tag == inkex.addNS("g",'svg'):
  79                     self.process_group(obj)
  80             else:
  81                 if trafo.tag == inkex.addNS('g','svg'):
  82                     inkex.errormsg(_("The second selected object is a group, not a path.\nTry using the procedure Object->Ungroup."))
  83                 else:
  84                     inkex.errormsg(_("The second selected object is not a path.\nTry using the procedure Path->Object to Path."))
  85                 exit()
  86         else:
  87             inkex.errormsg(_("The first selected object is not a path.\nTry using the procedure Path->Object to Path."))
  88             exit()
  89
  90     def process_group(self,group):
  91         for node in group:
  92             if node.tag == inkex.addNS('path','svg'):
  93                 self.process_path(node)
  94             if node.tag == inkex.addNS('g','svg'):
  95                 self.process_group(node)
  96
  97     def process_path(self,path):
  98         d = path.get('d')
  99         p = cubicsuperpath.parsePath(d)
 100         for subs in p:
 101             for csp in subs:
 102                 csp[0] = self.trafopoint(csp[0])
 103                 csp[1] = self.trafopoint(csp[1])
 104                 csp[2] = self.trafopoint(csp[2])
 105         path.set('d',cubicsuperpath.formatPath(p))
 106
 107     def trafopoint(self,(x,y)):
 108         #Transform algorithm thanks to Jose Hevia (freon)
 109         vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
 110         xratio = abs(vector.delta_x())/self.q['width']
 111         yratio = abs(vector.delta_y())/self.q['height']
 112
 113         horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
 114         vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))
 115
 116         p = intersectSegments(vert,horz)
 117         return [p['x'],p['y']]
 118
 119 if __name__ == '__main__':
 120     e = Project()
 121     e.affect()
 122
 123
 124 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99