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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]))
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