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-rw-r--r--share/extensions/hpgl_decoder.py100
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diff --git a/share/extensions/hpgl_decoder.py b/share/extensions/hpgl_decoder.py
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+# 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]))