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Diffstat (limited to 'share/extensions/hpgl_decoder.py')
| -rw-r--r-- | share/extensions/hpgl_decoder.py | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/share/extensions/hpgl_decoder.py b/share/extensions/hpgl_decoder.py new file mode 100644 index 0000000..1e1577e --- /dev/null +++ b/share/extensions/hpgl_decoder.py @@ -0,0 +1,100 @@ +# coding=utf-8 +# +# Copyright (C) 2013 Public Domain +# 2018 Martin Owens <doctormo@gmail.com> +# +# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + +# standard libraries +from __future__ import unicode_literals + +# local library +import inkex +from inkex.localization import inkex_gettext as _ +from inkex.base import SvgOutputMixin + +class hpglDecoder(SvgOutputMixin): + def __init__(self, hpglString, options): + """ options: + "resolutionX":float + "resolutionY":float + "showMovements":bool + """ + self.hpglString = hpglString + self.options = options + self.scaleX = options.resolutionX / 25.4 # dots/inch to dots/mm + self.scaleY = options.resolutionY / 25.4 # dots/inch to dots/mm + self.warning = '' + self.textMovements = _("Movements") + self.textPenNumber = _("Pen ") + self.layers = {} + self.oldCoordinates = (0.0, 297.0) + + def get_svg(self): + """Generate an svg document from hgpl data""" + actual_layer = 0 + # prepare document + doc = self.get_template(width=210.0, height=297.0, unit='mm') + svg = doc.getroot() + svg.namedview.set('inkscape:document-units', 'mm') + + if self.options.showMovements: + self.layers[0] = svg.add(inkex.Layer(self.textMovements)) + + # cut stream into commands + hpgl_data = self.hpglString.split(';') + # if number of commands is under needed minimum, no data was found + if len(hpgl_data) < 3: + raise Exception('NO_HPGL_DATA') + # decode commands into svg data + for command in hpgl_data: + if command.strip() != '': + if command[:2] == 'IN' or command[:2] == 'FS' or command[:2] == 'VS': + # if Initialize, force or speed command ignore it + pass + elif command[:2] == 'SP': + # if Select Pen command + actual_layer = int(command[2:]) + elif command[:2] == 'PU': + # if Pen Up command + self.parameters_to_path(svg, command[2:], 0, True) + elif command[:2] == 'PD': + # if Pen Down command + self.parameters_to_path(svg, command[2:], actual_layer + 1, False) + else: + self.warning = 'UNKNOWN_COMMANDS' + return doc, self.warning + + def parameters_to_path(self, svg, parameters, layerNum, isPU): + """split params and sanity check them""" + parameters = parameters.strip().split(',') + if parameters and len(parameters) % 2 == 0: + for i, param in enumerate(parameters): + # convert params to document units + if i % 2 == 0: + parameters[i] = str(float(param) / self.scaleX) + else: + parameters[i] = str(297.0 - (float(param) / self.scaleY)) + # create path and add it to the corresponding layer + if not isPU or (self.options.showMovements and isPU): + # create layer if it does not exist + if layerNum not in self.layers: + label = self.textPenNumber + str(layerNum - 1) + self.layers[layerNum] = svg.add(inkex.Layer.new(label)) + + path = 'M %f,%f L %s' % (self.oldCoordinates[0], self.oldCoordinates[1], ','.join(parameters)) + style = 'stroke:#' + ('ff0000' if isPU else '000000') + '; stroke-width:0.2; fill:none;' + self.layers[layerNum].add(inkex.PathElement(d=path, style=style)) + self.oldCoordinates = (float(parameters[-2]), float(parameters[-1])) |