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.tag == inkex.addNS('path','svg') and trafo.tag == inkex.addNS('path','svg'):
  39             #distil trafo into four node points
  40             trafo = cubicsuperpath.parsePath(trafo.get('d'))
  41             trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]
  42
  43             #vectors pointing away from the trafo origin
  44             self.t1 = Segment(trafo[0],trafo[1])
  45             self.t2 = Segment(trafo[1],trafo[2])
  46             self.t3 = Segment(trafo[3],trafo[2])
  47             self.t4 = Segment(trafo[0],trafo[3])
  48
  49             #query inkscape about the bounding box of obj
  50             self.q = {'x':0,'y':0,'width':0,'height':0}
  51             file = self.args[-1]
  52             id = self.options.ids[0]
  53             for query in self.q.keys():
  54                 f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
  55                 self.q[query] = float(f.read())
  56                 f.close()
  57                 err.close()
  58
  59             #process path
  60             d = obj.get('d')
  61             p = cubicsuperpath.parsePath(d)
  62             for subs in p:
  63                 for csp in subs:
  64                     csp[0] = self.trafopoint(csp[0])
  65                     csp[1] = self.trafopoint(csp[1])
  66                     csp[2] = self.trafopoint(csp[2])
  67             obj.set('d',cubicsuperpath.formatPath(p))
  68
  69     def trafopoint(self,(x,y)):
  70         #Transform algorithm thanks to Jose Hevia (freon)
  71         vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
  72         xratio = abs(vector.delta_x())/self.q['width']
  73         yratio = abs(vector.delta_y())/self.q['height']
  74
  75         horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
  76         vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))
  77
  78         p = intersectSegments(vert,horz)
  79         return [p['x'],p['y']]
  80
  81 if __name__ == '__main__':
  82     e = Project()
  83     e.affect()
  84
  85
  86 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99