#!/usr/bin/env python ''' Copyright (C) 2007 hugomatic... based on dots.py (C) 2005 Aaron Spike, aaron@ekips.org modified by Fabrizio Zellini: units to mm and simple transformation matrix 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 sys.path.append('/usr/share/inkscape/extensions') # or another path, as necessary import inkex, simplestyle, simplepath import os,re import xml.xpath # mathematically a 3-by-3 matrix: # # a b 0 # c d 0 # tx ty 1 # # # we represent this as a 6-element list: # 0 1 2 3 4 5 # [ a b c d tx ty ] # # translation by (tx, ty) is described by # # 1 0 0 # 0 1 0 # tx ty 1 # # # scaling by sx, sy is described by # # sx 0 0 # 0 sy 0 # 0 0 1 # # # rotations counterclockwise about the origin by an angle A # is described by: # # cos(A) sin(A) 0 # -sin(A) cos(A) 0 # 0 0 1 # class Gcode(inkex.Effect): def __init__(self): inkex.Effect.__init__(self) self.OptionParser.add_option("-d", "--directory", action="store", type="string", dest="directory", default="/tmp/", help="Directory for gcode file") self.OptionParser.add_option("-f", "--file", action="store", type="string", dest="file", default="out.ngc", help="File name") self.OptionParser.add_option("-u", "--scaleX", action="store", type="float", dest="scaleX", default="100.0", help="Scale factor X") self.OptionParser.add_option("-v", "--scaleY", action="store", type="float", dest="scaleY", default="100.0", help="Scale factor Y") self.OptionParser.add_option("-x", "--offsetX", action="store", type="float", dest="offsetX", default="0.0", help="Offset along X") self.OptionParser.add_option("-y", "--offsetY", action="store", type="float", dest="offsetY", default="0.0", help="Offset along Y") self.OptionParser.add_option("-s", "--safeZ", action="store", type="float", dest="safeZ", default="5", help="Z above all obstacles") self.OptionParser.add_option("-z", "--surfaceZ", action="store", type="float", dest="surfaceZ", default="0.0", help="Z above all obstacles") self.OptionParser.add_option("-c", "--cutZ", action="store", type="float", dest="cutZ", default="-4", help="Z depth of cut") self.OptionParser.add_option("-p", "--feed", action="store", type="float", dest="feed", default="100.0", help="Feed rate in mm/min") def effect(self): xScale = self.options.scaleX*2.54/900.0 yScale = self.options.scaleY*2.54/900.0 xOffset = self.options.offsetX yOffset = self.options.offsetY safeZ = self.options.safeZ surfaceZ = self.options.surfaceZ cutZ = self.options.cutZ feed = self.options.feed # default for transformation table #1, 0, 0, 1, 0, 0 a=1 b=0 c=0 d=1 tx=0 ty=0 ySize=0 ctx = xml.xpath.Context.Context(self.document,processorNss=inkex.NSS) yattr = xml.xpath.Evaluate('//svg/@height',self.document,context=ctx) if yattr: ySize = yattr[0].value ySize = inkex.unittouu(ySize) ySize = ySize matrixre = re.compile ("matrix\(([^,]+),([^,]+),([^,]+),([^,]+),([^,]+),([^,]+)\)") translatere = re.compile ("translate\(([^,]+),([^,]+)\)") fileName = os.path.join(self.options.directory, self.options.file) ngcfile = open(fileName, 'wb') ngcfile.write("G21\nF%.4f\n" % feed) ngcfile.write("G0 Z%.4f\n (move out of the way)\n" % safeZ) for id, node in self.selected.iteritems(): ngcfile.write("\n(ID " + str(id) + ")\n") if node.tagName == 'path': self.group = self.document.createElement('svg:g') node.parentNode.appendChild(self.group) new = self.document.createElement('svg:path') try: t = node.attributes.getNamedItem('transform').value self.group.setAttribute('transform', t) # parse matrix to fixup dimensions # matrix(3.1187192,0,0,1.6602321,-174.43497,-1.6029062) # parse matrix match = matrixre.match (t) if match: a = float(match.group(1)) b = float(match.group(2)) c = float(match.group(3)) d = float(match.group(4)) tx = float(match.group(5)) ty = float(match.group(6)) match = translatere.match(t) if match: tx = float(match.group(1)) ty = float(match.group(2)) #print a,b,c,d,e,f except AttributeError: pass p = simplepath.parsePath(node.attributes.getNamedItem('d').value) for cmd,params in p: if cmd == 'M': xPath = float(params[-2]) yPath = float(params[-1]) # apply transformation matrix xPath = a*xPath + c*yPath + tx yPath = b*xPath + d*yPath + ty yPath = ySize-yPath x = xPath * xScale + xOffset y = yPath * yScale + yOffset ngcfile.write("g00 Z%.4f\n (approaching)\n" % surfaceZ) ngcfile.write("g00 X%.4f Y%.4f\n (fly above next cut)\n" % (x,y)) ngcfile.write("g01 Z%.4f\n (plunging)\n" % cutZ) ngcfile.write("g01 X%.4f Y%.4f\n" % (x,y)) continue if cmd == 'C': xa = float(params[0]) ya = float(params[1]) xb = float(params[2]) yb = float(params[3]) xc = float(params[4]) yc = float(params[5]) self.interpolate(ngcfile, xa,ya, xb,yb, xc,yc, 10) if cmd != 'Z': xPath = float(params[-2]) yPath = float(params[-1]) # apply transformation matrix xPath = a*xPath + c*yPath + tx yPath = b*xPath + d*yPath + ty yPath = ySize-yPath x = xPath * xScale + xOffset y = yPath * yScale + yOffset ngcfile.write("g01 X%.4f Y%.4f\n" % (x,y)) ngcfile.write("G0 Z%.4f\n (move out of the way)" % safeZ) ngcfile.write("G00 Z%.4f\n" % safeZ) ngcfile.write("M2\n") ngcfile.close() def interpolate(self, ngcfile, xa,ya, xb,yb, xc,yc, nbOfPoints): ngcfile.write("(C [%.4f, %.4f] [%.4f, %.4f] [%.4f, %.4f])\n" %(xa,ya, xb, yb, xc,yc)) e = Gcode() e.affect()