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summersnight.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

"""
import inkex, os, re, simplepath, cubicsuperpath
from ffgeom 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.")
                        sys.exit()
                  
                  #obj is selected second
                  obj = self.selected[self.options.ids[0]]
                  trafo = self.selected[self.options.ids[1]]
                        if obj.tagName == 'path' and trafo.tagName == 'path':
                        #distil trafo into four node points
                        trafo = cubicsuperpath.parsePath(trafo.attributes.getNamedItem('d').value)
                        trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]

                        #vectors pointing away from the trafo origin
                        self.t1 = Segment(trafo[0],trafo[1])
                        self.t2 = Segment(trafo[1],trafo[2])
                        self.t3 = Segment(trafo[3],trafo[2])
                        self.t4 = Segment(trafo[0],trafo[3])
      
                        #query inkscape about the bounding box of obj
                        self.q = {'x':0,'y':0,'width':0,'height':0}
                        file = self.args[-1]
                        id = self.options.ids[0]
                        for query in self.q.keys():
                              f = os.popen("inkscape --query-%s --query-id=%s %s" % (query,id,file))
                              self.q[query] = float(f.read())
                              f.close()
                        #glean document height from the SVG
                        docheight = unittouu(inkex.xml.xpath.Evaluate('/svg/@height',self.document)[0].value)
                        #Flip inkscapes transposed renderer coords
                        self.q['y'] = docheight - self.q['y'] - self.q['height']

                        #process path
                        d = obj.attributes.getNamedItem('d')
                                p = cubicsuperpath.parsePath(d.value)
                        for subs in p:
                              for csp in subs:
                                    csp[0] = self.trafopoint(csp[0])
                                    csp[1] = self.trafopoint(csp[1])
                                    csp[2] = self.trafopoint(csp[2])
                                d.value = cubicsuperpath.formatPath(p)

      def trafopoint(self,(x,y)):
            #Transform algorithm thanks to Jose Hevia (freon)
            vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
            xratio = abs(vector.delta_x())/self.q['width']
            yratio = abs(vector.delta_y())/self.q['height']
      
            horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
            vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))

            p = intersectSegments(vert,horz)
            return [p['x'],p['y']]  

e = Project()
e.affect()

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