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extrude.py

#!/usr/bin/env python 
'''
Copyright (C) 2007

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 sys, os
sys.path.append(os.path.dirname(sys.argv[0]))  #?

import inkex, simplepath, simpletransform, sys, cubicsuperpath

class Extrude(inkex.Effect):
    def __init__(self):
        inkex.Effect.__init__(self)
        opts = [('-m', '--mode', 'string', 'mode', 'Lines',
                 'Join paths with lines or polygons'),
                ]
        for o in opts:
            self.OptionParser.add_option(o[0], o[1], action="store", type=o[2],
                                         dest=o[3], default=o[4], help=o[5])

    def effect(self):
        paths = []
        for id, node in self.selected.iteritems():
            if node.tag == '{http://www.w3.org/2000/svg}path':
                paths.append(node)
                if len(paths) == 2:
                    break
        else:
            sys.stderr.write('Need 2 paths selected\n')
            return


        pts = [cubicsuperpath.parsePath(paths[i].get('d'))
               for i in (0,1)]

        for i in (0,1):
            if 'transform' in paths[i].keys():
                trans = paths[i].get('transform')
                trans = simpletransform.parseTransform(trans)
                simpletransform.applyTransformToPath(trans, pts[i])

        verts = []
        for i in range(0, min(map(len, pts))):
            comp = []
            for j in range(0, min(len(pts[0][i]), len(pts[1][i]))):
                comp.append([pts[0][i][j][1][-2:], pts[1][i][j][1][-2:]])
            verts.append(comp)

        if self.options.mode.lower() == 'lines':
            line = []
            for comp in verts:
                for n,v in enumerate(comp):
                  line += [('M', v[0])]
                  line += [('L', v[1])]
            ele = inkex.etree.Element('{http://www.w3.org/2000/svg}path')
            paths[0].xpath('..')[0].append(ele)
            ele.set('d', simplepath.formatPath(line))
            ele.set('style', 'fill:none;stroke:#000000;stroke-opacity:1;stroke-width:1;')
        elif self.options.mode.lower() == 'polygons':
            g = inkex.etree.Element('{http://www.w3.org/2000/svg}g')
            g.set('style', 'fill:#000000;stroke:#000000;fill-opacity:0.3;stroke-width:2;stroke-opacity:0.6;')   
            paths[0].xpath('..')[0].append(g)
            for comp in verts:
                for n,v in enumerate(comp):
                    nn = n+1
                    if nn == len(comp): nn = 0
                    line = []
                    line += [('M', comp[n][0])]
                    line += [('L', comp[n][1])]
                    line += [('L', comp[nn][1])]
                    line += [('L', comp[nn][0])]
                    line += [('L', comp[n][0])]
                    ele = inkex.etree.Element('{http://www.w3.org/2000/svg}path')
                    g.append(ele)
                    ele.set('d', simplepath.formatPath(line))


if __name__ == '__main__':   #pragma: no cover
    e = Extrude()
    e.affect()

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