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) 2008,2010 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 - support for layers added July 2010
  13 - support for rectangle added Dec 2010
  14
  15 This program is free software; you can redistribute it and/or modify
  16 it under the terms of the GNU General Public License as published by
  17 the Free Software Foundation; either version 2 of the License, or
  18 (at your option) any later version.
  19
  20 This program is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public License
  26 along with this program; if not, write to the Free Software
  27 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28 '''
  29 import inkex, simplestyle, simpletransform, cubicsuperpath, coloreffect, dxf_templates, math
  30 import gettext
  31 _ = gettext.gettext
  32
  33 try:
  34     from numpy import *
  35     from numpy.linalg import solve
  36 except:
  37     inkex.errormsg(_("Failed to import the numpy or numpy.linalg modules. These modules are required by this extension. Please install them and try again."))
  38     inkex.sys.exit()
  39
  40 def pointdistance((x1,y1),(x2,y2)):
  41     return math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2))
  42
  43 def get_fit(u, csp, col):
  44     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]
  45
  46 def get_matrix(u, i, j):
  47     if j == i + 2:
  48         return (u[i]-u[i-1])*(u[i]-u[i-1])/(u[i+2]-u[i-1])/(u[i+1]-u[i-1])
  49     elif j == i + 1:
  50         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])
  51     elif j == i:
  52         return (u[i+1]-u[i])*(u[i+1]-u[i])/(u[i+1]-u[i-2])/(u[i+1]-u[i-1])
  53     else:
  54         return 0
  55
  56 class MyEffect(inkex.Effect):
  57     def __init__(self):
  58         inkex.Effect.__init__(self)
  59         self.OptionParser.add_option("-R", "--ROBO", action="store", type="string", dest="ROBO")
  60         self.OptionParser.add_option("-P", "--POLY", action="store", type="string", dest="POLY")
  61         self.OptionParser.add_option("--units", action="store", type="string", dest="units")
  62         self.OptionParser.add_option("--tab", action="store", type="string", dest="tab")
  63         self.OptionParser.add_option("--inputhelp", action="store", type="string", dest="inputhelp")
  64         self.dxf = []
  65         self.handle = 255                       # handle for DXF ENTITY
  66         self.layers = ['0']
  67         self.layer = '0'                        # mandatory layer
  68         self.csp_old = [[0.0,0.0]]*4            # previous spline
  69         self.d = array([0], float)              # knot vector
  70         self.poly = [[0.0,0.0]]                 # LWPOLYLINE data
  71     def output(self):
  72         print ''.join(self.dxf)
  73     def dxf_add(self, str):
  74         self.dxf.append(str)
  75     def dxf_line(self,csp):
  76         self.handle += 1
  77         self.dxf_add("  0\nLINE\n  5\n%x\n100\nAcDbEntity\n  8\n%s\n 62\n%d\n100\nAcDbLine\n" % (self.handle, self.layer, self.color))
  78         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]))
  79     def LWPOLY_line(self,csp):
  80         if (abs(csp[0][0] - self.poly[-1][0]) > .0001
  81             or abs(csp[0][1] - self.poly[-1][1]) > .0001):
  82             self.LWPOLY_output()                            # terminate current polyline
  83             self.poly = [csp[0]]                            # initiallize new polyline
  84             self.color_LWPOLY = self.color
  85             self.layer_LWPOLY = self.layer
  86         self.poly.append(csp[1])
  87     def LWPOLY_output(self):
  88         if len(self.poly) == 1:
  89             return
  90         self.handle += 1
  91         self.dxf_add("  0\nLWPOLYLINE\n  5\n%x\n100\nAcDbEntity\n  8\n%s\n 62\n%d\n100\nAcDbPolyline\n 90\n%d\n 70\n0\n" % (self.handle, self.layer_LWPOLY, self.color_LWPOLY, len(self.poly)))
  92         for i in range(len(self.poly)):
  93             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (self.poly[i][0],self.poly[i][1]))
  94     def dxf_spline(self,csp):
  95         knots = 8
  96         ctrls = 4
  97         self.handle += 1
  98         self.dxf_add("  0\nSPLINE\n  5\n%x\n100\nAcDbEntity\n  8\n%s\n 62\n%d\n100\nAcDbSpline\n" % (self.handle, self.layer, self.color))
  99         self.dxf_add(" 70\n8\n 71\n3\n 72\n%d\n 73\n%d\n 74\n0\n" % (knots, ctrls))
 100         for i in range(2):
 101             for j in range(4):
 102                 self.dxf_add(" 40\n%d\n" % i)
 103         for i in csp:
 104             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (i[0],i[1]))
 105     def ROBO_spline(self,csp):
 106         # this spline has zero curvature at the endpoints, as in ROBO-Master
 107         if (abs(csp[0][0] - self.csp_old[3][0]) > .0001
 108             or abs(csp[0][1] - self.csp_old[3][1]) > .0001
 109             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):
 110             self.ROBO_output()                              # terminate current spline
 111             self.xfit = array([csp[0][0]], float)           # initiallize new spline
 112             self.yfit = array([csp[0][1]], float)
 113             self.d = array([0], float)
 114             self.color_ROBO = self.color
 115             self.layer_ROBO = self.layer
 116         self.xfit = concatenate((self.xfit, zeros((3))))    # append to current spline
 117         self.yfit = concatenate((self.yfit, zeros((3))))
 118         self.d = concatenate((self.d, zeros((3))))
 119         for i in range(1, 4):
 120             j = len(self.d) + i - 4
 121             self.xfit[j] = get_fit(i/3.0, csp, 0)
 122             self.yfit[j] = get_fit(i/3.0, csp, 1)
 123             self.d[j] = self.d[j-1] + pointdistance((self.xfit[j-1],self.yfit[j-1]),(self.xfit[j],self.yfit[j]))
 124         self.csp_old = csp
 125     def ROBO_output(self):
 126         if len(self.d) == 1:
 127             return
 128         fits = len(self.d)
 129         ctrls = fits + 2
 130         knots = ctrls + 4
 131         self.xfit = concatenate((self.xfit, zeros((2))))    # pad with 2 endpoint constraints
 132         self.yfit = concatenate((self.yfit, zeros((2))))    # pad with 2 endpoint constraints
 133         self.d = concatenate((self.d, zeros((6))))          # pad with 3 duplicates at each end
 134         self.d[fits+2] = self.d[fits+1] = self.d[fits] = self.d[fits-1]
 135         solmatrix = zeros((ctrls,ctrls), dtype=float)
 136         for i in range(fits):
 137             solmatrix[i,i]   = get_matrix(self.d, i, i)
 138             solmatrix[i,i+1] = get_matrix(self.d, i, i+1)
 139             solmatrix[i,i+2] = get_matrix(self.d, i, i+2)
 140         solmatrix[fits, 0]   = self.d[2]/self.d[fits-1]     # curvature at start = 0
 141         solmatrix[fits, 1]   = -(self.d[1] + self.d[2])/self.d[fits-1]
 142         solmatrix[fits, 2]   = self.d[1]/self.d[fits-1]
 143         solmatrix[fits+1, fits-1] = (self.d[fits-1] - self.d[fits-2])/self.d[fits-1]   # curvature at end = 0
 144         solmatrix[fits+1, fits]   = (self.d[fits-3] + self.d[fits-2] - 2*self.d[fits-1])/self.d[fits-1]
 145         solmatrix[fits+1, fits+1] = (self.d[fits-1] - self.d[fits-3])/self.d[fits-1]
 146         xctrl = solve(solmatrix, self.xfit)
 147         yctrl = solve(solmatrix, self.yfit)
 148         self.handle += 1
 149         self.dxf_add("  0\nSPLINE\n  5\n%x\n100\nAcDbEntity\n  8\n%s\n 62\n%d\n100\nAcDbSpline\n" % (self.handle, self.layer_ROBO, self.color_ROBO))
 150         self.dxf_add(" 70\n0\n 71\n3\n 72\n%d\n 73\n%d\n 74\n%d\n" % (knots, ctrls, fits))
 151         for i in range(knots):
 152             self.dxf_add(" 40\n%f\n" % self.d[i-3])
 153         for i in range(ctrls):
 154             self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (xctrl[i],yctrl[i]))
 155         for i in range(fits):
 156             self.dxf_add(" 11\n%f\n 21\n%f\n 31\n0.0\n" % (self.xfit[i],self.yfit[i]))
 157
 158     def process_path(self, node, mat):
 159         rgb = (0,0,0)
 160         style = node.get('style')
 161         if style:
 162             style = simplestyle.parseStyle(style)
 163             if style.has_key('stroke'):
 164                 if style['stroke'] and style['stroke'] != 'none':
 165                     rgb = simplestyle.parseColor(style['stroke'])
 166         hsl = coloreffect.ColorEffect.rgb_to_hsl(coloreffect.ColorEffect(),rgb[0]/255.0,rgb[1]/255.0,rgb[2]/255.0)
 167         self.color = 7                                  # default is black
 168         if hsl[2]:
 169             self.color = 1 + (int(6*hsl[0] + 0.5) % 6)  # use 6 hues
 170         if node.tag == inkex.addNS('path','svg'):
 171             d = node.get('d')
 172             if not d:
 173                 return
 174             p = cubicsuperpath.parsePath(d)
 175         elif node.tag == inkex.addNS('rect','svg'):
 176             x = float(node.get('x'))
 177             y = float(node.get('y'))
 178             width = float(node.get('width'))
 179             height = float(node.get('height'))
 180             p = [[[x, y],[x, y],[x, y]]]
 181             p.append([[x + width, y],[x + width, y],[x + width, y]])
 182             p.append([[x + width, y + height],[x + width, y + height],[x + width, y + height]])
 183             p.append([[x, y + height],[x, y + height],[x, y + height]])
 184             p.append([[x, y],[x, y],[x, y]])
 185             p = [p]
 186         else:
 187             return
 188         trans = node.get('transform')
 189         if trans:
 190             mat = simpletransform.composeTransform(mat, simpletransform.parseTransform(trans))
 191         simpletransform.applyTransformToPath(mat, p)
 192         for sub in p:
 193             for i in range(len(sub)-1):
 194                 s = sub[i]
 195                 e = sub[i+1]
 196                 if s[1] == s[2] and e[0] == e[1]:
 197                     if (self.options.POLY == 'true'):
 198                         self.LWPOLY_line([s[1],e[1]])
 199                     else:
 200                         self.dxf_line([s[1],e[1]])
 201                 elif (self.options.ROBO == 'true'):
 202                     self.ROBO_spline([s[1],s[2],e[0],e[1]])
 203                 else:
 204                     self.dxf_spline([s[1],s[2],e[0],e[1]])
 205
 206     def process_group(self, group):
 207         if group.get(inkex.addNS('groupmode', 'inkscape')) == 'layer':
 208             layer = group.get(inkex.addNS('label', 'inkscape'))
 209             layer = layer.replace(' ', '_')
 210             if layer in self.layers:
 211                 self.layer = layer
 212         trans = group.get('transform')
 213         if trans:
 214             self.groupmat.append(simpletransform.composeTransform(self.groupmat[-1], simpletransform.parseTransform(trans)))
 215         for node in group:
 216             if node.tag == inkex.addNS('g','svg'):
 217                 self.process_group(node)
 218             else:
 219                 self.process_path(node, self.groupmat[-1])
 220         if trans:
 221             self.groupmat.pop()
 222
 223     def effect(self):
 224         #References:   Minimum Requirements for Creating a DXF File of a 3D Model By Paul Bourke
 225         #              NURB Curves: A Guide for the Uninitiated By Philip J. Schneider
 226         #              The NURBS Book By Les Piegl and Wayne Tiller (Springer, 1995)
 227         self.dxf_add("999\nDXF created by Inkscape\n")
 228         self.dxf_add(dxf_templates.r14_header)
 229         for node in self.document.getroot().xpath('//svg:g', namespaces=inkex.NSS):
 230             if node.get(inkex.addNS('groupmode', 'inkscape')) == 'layer':
 231                 layer = node.get(inkex.addNS('label', 'inkscape'))
 232                 layer = layer.replace(' ', '_')
 233                 if layer and not layer in self.layers:
 234                     self.layers.append(layer)
 235         self.dxf_add("  2\nLAYER\n  5\n2\n100\nAcDbSymbolTable\n 70\n%s\n" % len(self.layers))
 236         for i in range(len(self.layers)):
 237             self.dxf_add("  0\nLAYER\n  5\n%x\n100\nAcDbSymbolTableRecord\n100\nAcDbLayerTableRecord\n  2\n%s\n 70\n0\n  6\nCONTINUOUS\n" % (i + 80, self.layers[i]))
 238         self.dxf_add(dxf_templates.r14_style)
 239
 240         scale = eval(self.options.units)
 241         if not scale:
 242             scale = 25.4/90
 243         h = inkex.unittouu(self.document.getroot().xpath('@height', namespaces=inkex.NSS)[0])
 244         self.groupmat = [[[scale, 0.0, 0.0], [0.0, -scale, h*scale]]]
 245         doc = self.document.getroot()
 246         self.process_group(doc)
 247         if self.options.ROBO == 'true':
 248             self.ROBO_output()
 249         if self.options.POLY == 'true':
 250             self.LWPOLY_output()
 251         self.dxf_add(dxf_templates.r14_footer)
 252
 253 if __name__ == '__main__':
 254     e = MyEffect()
 255     e.affect()
 256
 257
 258 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99