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, re, simplepath, cubicsuperpath
  21 from ffgeom import *
  22
  23 uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
  24 def unittouu(string):
  25     unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
  26     param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
  27
  28     p = param.match(string)
  29     u = unit.search(string)
  30     if p:
  31         retval = float(p.string[p.start():p.end()])
  32     else:
  33         retval = 0.0
  34     if u:
  35         try:
  36             return retval * uuconv[u.string[u.start():u.end()]]
  37         except KeyError:
  38             pass
  39     return retval
  40
  41 class Project(inkex.Effect):
  42         def __init__(self):
  43                 inkex.Effect.__init__(self)
  44         def effect(self):
  45             if len(self.options.ids) < 2:
  46                 inkex.debug("Requires two selected paths. The second must be exctly four nodes long.")
  47                 exit()
  48
  49             #obj is selected second
  50             obj = self.selected[self.options.ids[0]]
  51             trafo = self.selected[self.options.ids[1]]
  52             if obj.tagName == 'path' and trafo.tagName == 'path':
  53                 #distil trafo into four node points
  54                 trafo = cubicsuperpath.parsePath(trafo.attributes.getNamedItem('d').value)
  55                 trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]
  56
  57                 #vectors pointing away from the trafo origin
  58                 self.t1 = Segment(trafo[0],trafo[1])
  59                 self.t2 = Segment(trafo[1],trafo[2])
  60                 self.t3 = Segment(trafo[3],trafo[2])
  61                 self.t4 = Segment(trafo[0],trafo[3])
  62
  63                 #query inkscape about the bounding box of obj
  64                 self.q = {'x':0,'y':0,'width':0,'height':0}
  65                 file = self.args[-1]
  66                 id = self.options.ids[0]
  67                 for query in self.q.keys():
  68                     f = os.popen("inkscape --query-%s --query-id=%s %s" % (query,id,file))
  69                     self.q[query] = float(f.read())
  70                     f.close()
  71                 #glean document height from the SVG
  72                 docheight = unittouu(inkex.xml.xpath.Evaluate('/svg/@height',self.document)[0].value)
  73                 #Flip inkscapes transposed renderer coords
  74                 self.q['y'] = docheight - self.q['y'] - self.q['height']
  75
  76                 #process path
  77                 d = obj.attributes.getNamedItem('d')
  78                 p = cubicsuperpath.parsePath(d.value)
  79                 for subs in p:
  80                     for csp in subs:
  81                         csp[0] = self.trafopoint(csp[0])
  82                         csp[1] = self.trafopoint(csp[1])
  83                         csp[2] = self.trafopoint(csp[2])
  84                 d.value = cubicsuperpath.formatPath(p)
  85
  86     def trafopoint(self,(x,y)):
  87         #Transform algorithm thanks to Jose Hevia (freon)
  88         vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
  89         xratio = abs(vector.delta_x())/self.q['width']
  90         yratio = abs(vector.delta_y())/self.q['height']
  91
  92         horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
  93         vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))
  94
  95         p = intersectSegments(vert,horz)
  96         return [p['x'],p['y']]
  97
  98 e = Project()
  99 e.affect()