share/extensions/dxf_outlines.py

   1 #!/usr/bin/env python
   2 '''
   3 Copyright (C) 2005,2007,2008 Aaron Spike, aaron@ekips.org
   4 Copyright (C) 2008 Alvin Penner, penner@vaxxine.com
   5
   6 - template dxf_outlines.dxf added Feb 2008 by Alvin Penner
   7 - ROBO-Master output option added Aug 2008
   8 - ROBO-Master multispline output added Sept 2008
   9 - LWPOLYLINE output modification added Dec 2008
  10 - toggle between LINE/LWPOLYLINE added Jan 2010
  11 - support for transform elements added July 2010
  12
  13 This program is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 2 of the License, or
  16 (at your option) any later version.
  17
  18 This program is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with this program; if not, write to the Free Software
  25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26 '''
  27 import inkex, simplestyle, simpletransform, cubicsuperpath, coloreffect, dxf_templates, math
  28 import gettext
  29 _ = gettext.gettext
  30
  31 try:
  32     from numpy import *
  33     from numpy.linalg import solve
  34 except:
  35     inkex.errormsg(_("Failed to import the numpy or numpy.linalg modules. These modules are required by this extension. Please install them and try again."))
  36     inkex.sys.exit()
  37
  38 def pointdistance((x1,y1),(x2,y2)):
  39     return math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2))
  40
  41 def get_fit(u, csp, col):
  42     return (1-u)**3*csp[0][col] + 3*(1-u)**2*u*csp[1][col] + 3*(1-u)*u**2*csp[2][col] + u**3*csp[3][col]
  43
  44 def get_matrix(u, i, j):
  45     if j == i + 2:
  46         return (u[i]-u[i-1])*(u[i]-u[i-1])/(u[i+2]-u[i-1])/(u[i+1]-u[i-1])
  47     elif j == i + 1:
  48         return ((u[i]-u[i-1])*(u[i+2]-u[i])/(u[i+2]-u[i-1]) + (u[i+1]-u[i])*(u[i]-u[i-2])/(u[i+1]-u[i-2]))/(u[i+1]-u[i-1])
  49     elif j == i:
  50         return (u[i+1]-u[i])*(u[i+1]-u[i])/(u[i+1]-u[i-2])/(u[i+1]-u[i-1])
  51     else:
  52         return 0
  53
  54 class MyEffect(inkex.Effect):
  55     def __init__(self):
  56         inkex.Effect.__init__(self)
  57         self.OptionParser.add_option("-R", "--ROBO", action="store", type="string", dest="ROBO")
  58         self.OptionParser.add_option("-P", "--POLY", action="store", type="string", dest="POLY")
  59         self.OptionParser.add_option("--tab", action="store", type="string", dest="tab")
  60         self.OptionParser.add_option("--inputhelp", action="store", type="string", dest="inputhelp")
  61         self.dxf = []
  62         self.handle = 255                       # handle for DXF ENTITY
  63         self.csp_old = [[0.0,0.0]]*4            # previous spline
  64         self.d = array([0], float)              # knot vector
  65         self.poly = [[0.0,0.0]]                 # LWPOLYLINE data
  66     def output(self):
  67         print ''.join(self.dxf)
  68     def dxf_add(self, str):
  69         self.dxf.append(str)
  70     def dxf_line(self,csp):
  71         self.handle += 1
  72         self.dxf_add("  0\nLINE\n  5\n%x\n100\nAcDbEntity\n  8\n0\n 62\n%d\n100\nAcDbLine\n" % (self.handle, self.color))
  73         self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n 11\n%f\n 21\n%f\n 31\n0.0\n" % (csp[0][0],csp[0][1],csp[1][0],csp[1][1]))
  74     def LWPOLY_line(self,csp):
  75         if (abs(csp[0][0] - self.poly[-1][0]) > .0001
  76             or abs(csp[0][1] - self.poly[-1][1]) > .0001):
  77             self.LWPOLY_output()                            # terminate current polyline
  78             self.poly = [csp[0]]                            # initiallize new polyline
  79             self.color_LWPOLY = self.color
  80         self.poly.append(csp[1])
  81     def LWPOLY_output(self):
  82         if len(self.poly) == 1:
  83             return
  84         self.handle += 1
  85         self.dxf_add("  0\nLWPOLYLINE\n  5\n%x\n100\nAcDbEntity\n  8\n0\n 62\n%d\n100\nAcDbPolyline\n 90\n%d\n 70\n0\n" % (self.handle, self.color_LWPOLY, len(self.poly)))
  86         for i in range(len(self.poly)):
  87             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (self.poly[i][0],self.poly[i][1]))
  88     def dxf_spline(self,csp):
  89         knots = 8
  90         ctrls = 4
  91         self.handle += 1
  92         self.dxf_add("  0\nSPLINE\n  5\n%x\n100\nAcDbEntity\n  8\n0\n 62\n%d\n100\nAcDbSpline\n" % (self.handle, self.color))
  93         self.dxf_add(" 70\n8\n 71\n3\n 72\n%d\n 73\n%d\n 74\n0\n" % (knots, ctrls))
  94         for i in range(2):
  95             for j in range(4):
  96                 self.dxf_add(" 40\n%d\n" % i)
  97         for i in csp:
  98             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (i[0],i[1]))
  99     def ROBO_spline(self,csp):
 100         # this spline has zero curvature at the endpoints, as in ROBO-Master
 101         if (abs(csp[0][0] - self.csp_old[3][0]) > .0001
 102             or abs(csp[0][1] - self.csp_old[3][1]) > .0001
 103             or abs((csp[1][1]-csp[0][1])*(self.csp_old[3][0]-self.csp_old[2][0]) - (csp[1][0]-csp[0][0])*(self.csp_old[3][1]-self.csp_old[2][1])) > .001):
 104             self.ROBO_output()                              # terminate current spline
 105             self.xfit = array([csp[0][0]], float)           # initiallize new spline
 106             self.yfit = array([csp[0][1]], float)
 107             self.d = array([0], float)
 108             self.color_ROBO = self.color
 109         self.xfit = concatenate((self.xfit, zeros((3))))    # append to current spline
 110         self.yfit = concatenate((self.yfit, zeros((3))))
 111         self.d = concatenate((self.d, zeros((3))))
 112         for i in range(1, 4):
 113             j = len(self.d) + i - 4
 114             self.xfit[j] = get_fit(i/3.0, csp, 0)
 115             self.yfit[j] = get_fit(i/3.0, csp, 1)
 116             self.d[j] = self.d[j-1] + pointdistance((self.xfit[j-1],self.yfit[j-1]),(self.xfit[j],self.yfit[j]))
 117         self.csp_old = csp
 118     def ROBO_output(self):
 119         if len(self.d) == 1:
 120             return
 121         fits = len(self.d)
 122         ctrls = fits + 2
 123         knots = ctrls + 4
 124         self.xfit = concatenate((self.xfit, zeros((2))))    # pad with 2 endpoint constraints
 125         self.yfit = concatenate((self.yfit, zeros((2))))    # pad with 2 endpoint constraints
 126         self.d = concatenate((self.d, zeros((6))))          # pad with 3 duplicates at each end
 127         self.d[fits+2] = self.d[fits+1] = self.d[fits] = self.d[fits-1]
 128         solmatrix = zeros((ctrls,ctrls), dtype=float)
 129         for i in range(fits):
 130             solmatrix[i,i]   = get_matrix(self.d, i, i)
 131             solmatrix[i,i+1] = get_matrix(self.d, i, i+1)
 132             solmatrix[i,i+2] = get_matrix(self.d, i, i+2)
 133         solmatrix[fits, 0]   = self.d[2]/self.d[fits-1]     # curvature at start = 0
 134         solmatrix[fits, 1]   = -(self.d[1] + self.d[2])/self.d[fits-1]
 135         solmatrix[fits, 2]   = self.d[1]/self.d[fits-1]
 136         solmatrix[fits+1, fits-1] = (self.d[fits-1] - self.d[fits-2])/self.d[fits-1]   # curvature at end = 0
 137         solmatrix[fits+1, fits]   = (self.d[fits-3] + self.d[fits-2] - 2*self.d[fits-1])/self.d[fits-1]
 138         solmatrix[fits+1, fits+1] = (self.d[fits-1] - self.d[fits-3])/self.d[fits-1]
 139         xctrl = solve(solmatrix, self.xfit)
 140         yctrl = solve(solmatrix, self.yfit)
 141         self.handle += 1
 142         self.dxf_add("  0\nSPLINE\n  5\n%x\n100\nAcDbEntity\n  8\n0\n 62\n%d\n100\nAcDbSpline\n" % (self.handle, self.color_ROBO))
 143         self.dxf_add(" 70\n0\n 71\n3\n 72\n%d\n 73\n%d\n 74\n%d\n" % (knots, ctrls, fits))
 144         for i in range(knots):
 145             self.dxf_add(" 40\n%f\n" % self.d[i-3])
 146         for i in range(ctrls):
 147             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (xctrl[i],yctrl[i]))
 148         for i in range(fits):
 149             self.dxf_add(" 11\n%f\n 21\n%f\n 31\n0.0\n" % (self.xfit[i],self.yfit[i]))
 150
 151     def process_path(self, node, mat):
 152         rgb = (0,0,0)
 153         style = node.get('style')
 154         if style:
 155             style = simplestyle.parseStyle(style)
 156             if style.has_key('stroke'):
 157                 if style['stroke'] and style['stroke'] != 'none':
 158                     rgb = simplestyle.parseColor(style['stroke'])
 159         hsl = coloreffect.ColorEffect.rgb_to_hsl(coloreffect.ColorEffect(),rgb[0]/255.0,rgb[1]/255.0,rgb[2]/255.0)
 160         self.color = 7                                  # default is black
 161         if hsl[2]:
 162             self.color = 1 + (int(6*hsl[0] + 0.5) % 6)  # use 6 hues
 163         d = node.get('d')
 164         if d:
 165             p = cubicsuperpath.parsePath(d)
 166             trans = node.get('transform')
 167             if trans:
 168                 mat = simpletransform.composeTransform(mat, simpletransform.parseTransform(trans))
 169             simpletransform.applyTransformToPath(mat, p)
 170             for sub in p:
 171                 for i in range(len(sub)-1):
 172                     s = sub[i]
 173                     e = sub[i+1]
 174                     if s[1] == s[2] and e[0] == e[1]:
 175                         if (self.options.POLY == 'true'):
 176                             self.LWPOLY_line([s[1],e[1]])
 177                         else:
 178                             self.dxf_line([s[1],e[1]])
 179                     elif (self.options.ROBO == 'true'):
 180                         self.ROBO_spline([s[1],s[2],e[0],e[1]])
 181                     else:
 182                         self.dxf_spline([s[1],s[2],e[0],e[1]])
 183
 184     def process_group(self, group):
 185         trans = group.get('transform')
 186         if trans:
 187             self.groupmat.append(simpletransform.composeTransform(self.groupmat[-1], simpletransform.parseTransform(trans)))
 188         for node in group:
 189             if node.tag == inkex.addNS('path','svg'):
 190                 self.process_path(node, self.groupmat[-1])
 191             if node.tag == inkex.addNS('g','svg'):
 192                 self.process_group(node)
 193         if trans:
 194             self.groupmat.pop()
 195
 196     def effect(self):
 197         #References:   Minimum Requirements for Creating a DXF File of a 3D Model By Paul Bourke
 198         #              NURB Curves: A Guide for the Uninitiated By Philip J. Schneider
 199         #              The NURBS Book By Les Piegl and Wayne Tiller (Springer, 1995)
 200         self.dxf_add("999\nDXF created by Inkscape\n")
 201         self.dxf_add(dxf_templates.r14_header)
 202
 203         scale = 25.4/90.0
 204         h = inkex.unittouu(self.document.getroot().xpath('@height', namespaces=inkex.NSS)[0])
 205         self.groupmat = [[[scale, 0.0, 0.0], [0.0, -scale, h*scale]]]
 206         doc = self.document.getroot()
 207         self.process_group(doc)
 208         if self.options.ROBO == 'true':
 209             self.ROBO_output()
 210         if self.options.POLY == 'true':
 211             self.LWPOLY_output()
 212         self.dxf_add(dxf_templates.r14_footer)
 213
 214 if __name__ == '__main__':
 215     e = MyEffect()
 216     e.affect()
 217
 218
 219 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99