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