#!/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, simplepath, cubicsuperpath, re 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 MyEffect(inkex.Effect): def __init__(self): inkex.Effect.__init__(self) self.dxf = '' def output(self): print self.dxf def dxf_add(self, str): self.dxf += str def dxf_line(self,csp): line = "\n0\nLINE\n8\n2\n62\n4\n10\n%f\n20\n%f\n30\n0\n11\n%f\n21\n%f\n31\n0" % (csp[0][0],csp[0][1],csp[1][0],csp[1][1]) self.dxf_add(line) def dxf_spline(self,csp): knots = 8 ctrls = 4 self.dxf_add("\n 0\nSPLINE\n 5\n43\n 8\n0\n 62\n256\n370\n-1\n 6\nByLayer") self.dxf_add("\n100\nAcDbEntity\n100\nAcDbSpline\n 70\n8\n 71\n3\n 72\n%d\n 73\n%d\n 74\n0" % (knots, ctrls)) for i in range(2): for j in range(4): self.dxf_add("\n 40\n%d" % i) for i in csp: self.dxf_add("\n 10\n%f\n 20\n%f\n 30\n0" % (i[0],i[1])) def effect(self): #References: Minimum Requirements for Creating a DXF File of a 3D Model By Paul Bourke # NURB Curves: A Guide for the Uninitiated By Philip J. Schneider self.dxf_add("999\nDXF created by Inkscape\n0\nSECTION\n2\nENTITIES") scale = 25.4/90.0 h = unittouu(inkex.xml.xpath.Evaluate('/svg/@height',self.document)[0].value) path = '//path' for node in inkex.xml.xpath.Evaluate(path,self.document): d = node.attributes.getNamedItem('d').value sim = simplepath.parsePath(d) simplepath.scalePath(sim,scale,-scale) simplepath.translatePath(sim,0,h*scale) p = cubicsuperpath.CubicSuperPath(sim) for sub in p: for i in range(len(sub)-1): s = sub[i] e = sub[i+1] if s[1] == s[2] and e[0] == e[1]: self.dxf_line([s[1],e[1]]) else: self.dxf_spline([s[1],s[2],e[0],e[1]]) self.dxf_add("\n0\nENDSEC\n0\nEOF\n") e = MyEffect() e.affect()