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Diffstat (limited to 'share/extensions/hpgl_decoder.py')
| -rw-r--r-- | share/extensions/hpgl_decoder.py | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/share/extensions/hpgl_decoder.py b/share/extensions/hpgl_decoder.py new file mode 100644 index 000000000..870775cb2 --- /dev/null +++ b/share/extensions/hpgl_decoder.py @@ -0,0 +1,118 @@ +#!/usr/bin/env python +# coding=utf-8 +''' +Copyright (C) 2013 Sebastian Wüst, sebi@timewaster.de + +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 +''' + +# standard libraries +from StringIO import StringIO +import math +# local library +import inkex + + +# TODO: Unittests +class hpglDecoder: + + def __init__(self, hpglString, options): + ''' options: + "resolutionX":float + "resolutionY":float + "showMovements":bool + ''' + self.hpglString = hpglString + self.options = options + self.scaleX = options.resolutionX / 90.0 # dots/inch to dots/pixels + self.scaleY = options.resolutionY / 90.0 # dots/inch to dots/pixels + self.warnings = [] + + def getSvg(self): + # parse hpgl data + # prepare document + self.doc = inkex.etree.parse(StringIO('<svg xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" width="%s" height="%s"></svg>' % + (self.options.docWidth, self.options.docHeight))) + actualLayer = 0 + self.layers = {} + if self.options.showMovements: + self.layers[0] = inkex.etree.SubElement(self.doc.getroot(), 'g', {inkex.addNS('groupmode', 'inkscape'): 'layer', inkex.addNS('label', 'inkscape'): 'Movements'}) + # parse paths + hpglData = self.hpglString.split(';') + if len(hpglData) < 3: + raise Exception('NO_HPGL_DATA') + oldCoordinates = (0.0, self.options.docHeight) + path = '' + for i, command in enumerate(hpglData): + if command.strip() != '': + if command[:2] == 'IN': + # if Initialize command, ignore + pass + elif command[:2] == 'SP': + # if Select Pen command + actualLayer = command[2:] + self.createLayer(actualLayer) + elif command[:2] == 'PU': + # if Pen Up command + if ' L ' in path: + self.addPathToLayer(path, actualLayer) + if self.options.showMovements and i != len(hpglData) - 1: + path = 'M %f,%f' % oldCoordinates + path += ' L %f,%f' % self.getParameters(command[2:]) + self.addPathToLayer(path, 0) + path = 'M %f,%f' % self.getParameters(command[2:]) + oldCoordinates = self.getParameters(command[2:]) + elif command[:2] == 'PD': + # if Pen Down command + parameterString = command[2:] + if parameterString.strip() != '': + parameterString = parameterString.replace(';', '').strip() + parameter = parameterString.split(',') + oldCoordinates = (float(parameter[-2]) / self.scaleX, self.options.docHeight - float(parameter[-1]) / self.scaleX) + for i, param in enumerate(parameter): + if i % 2 == 0: + parameter[i] = str(float(param) / self.scaleX) + else: + parameter[i] = str(self.options.docHeight - float(param) / self.scaleY) + parameterString = ','.join(parameter) + path += ' L %s' % parameterString + else: + self.warnings.append('UNKNOWN_COMMANDS') + if ' L ' in path: + self.addPathToLayer(path, actualLayer) + return (self.doc, self.warnings) + + def createLayer(self, layerNumber): + self.layers[layerNumber] = inkex.etree.SubElement(self.doc.getroot(), 'g', + {inkex.addNS('groupmode', 'inkscape'): 'layer', inkex.addNS('label', 'inkscape'): 'Drawing Pen ' + layerNumber}) + + def addPathToLayer(self, path, layerNumber): + lineColor = '000000' + if layerNumber == 0: + lineColor = 'ff0000' + inkex.etree.SubElement(self.layers[layerNumber], 'path', {'d': path, 'style': 'stroke:#' + lineColor + '; stroke-width:0.4; fill:none;'}) + + def getParameters(self, parameterString): + # process coordinates + if parameterString.strip() == '': + return [] + # remove command delimiter + parameterString = parameterString.replace(';', '').strip() + # split parameter + parameter = parameterString.split(',') + # convert to svg coordinate system and return + return (float(parameter[0]) / self.scaleX, self.options.docHeight - float(parameter[1]) / self.scaleY) + +# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
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