149 lines
6.6 KiB
Python
149 lines
6.6 KiB
Python
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#!/usr/bin/env python3
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"""
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Based on
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- https://github.com/TimeTravel-0/ofsplot
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ToDo's
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- break apart combined paths
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- option to handle groups
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Author: Mario Voigt / FabLab Chemnitz
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Mail: mario.voigt@stadtfabrikanten.org
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Last Patch: 10.06.2021
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License: GNU GPL v3
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"""
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import inkex
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import math
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from inkex.paths import CubicSuperPath
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import re
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import copy
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import pyclipper
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class OffsetPaths(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--tab')
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pars.add_argument('--unit')
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pars.add_argument("--offset_count", type=int, default=1, help="Number of offset paths")
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pars.add_argument("--offset", type=float, default=1.000, help="Offset amount")
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pars.add_argument("--init_offset", type=float, default=0.000, help="Initial Offset Amount")
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pars.add_argument("--offset_increase", type=float, default=0.000, help="Offset increase between iterations")
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pars.add_argument("--jointype", default="2", help="Join type")
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pars.add_argument("--endtype", default="3", help="End type")
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pars.add_argument("--miterlimit", type=float, default=3.0, help="Miter limit")
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pars.add_argument("--clipperscale", type=int, default=1024, help="Scaling factor. Should be a multiplicator of 2, like 2^4=16 or 2^10=1024. The higher the scale factor the higher the quality.")
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pars.add_argument("--copy_org", type=inkex.Boolean, default=True, help="copy original path")
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pars.add_argument("--individual", type=inkex.Boolean, default=True, help="Separate into individual paths")
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pars.add_argument("--path_types", default="both", help="Process open, closed or all paths!")
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def effect(self):
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unit_factor = 1.0 / self.svg.uutounit(1.0, self.options.unit)
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pathElements = self.svg.selection.filter(inkex.PathElement).values()
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count = sum(1 for pathElement in pathElements)
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pathElements = self.svg.selection.filter(inkex.PathElement).values() #we need to call this twice because the sum function consumes the generator
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if count == 0:
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inkex.errormsg("No paths selected.")
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exit()
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for pathElement in pathElements:
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csp = CubicSuperPath(pathElement.get('d'))
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'''
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check for closed or open paths
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'''
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isClosed = False
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raw = pathElement.path.to_arrays()
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if raw[-1][0] == 'Z' or \
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(raw[-1][0] == 'L' and raw[0][1] == raw[-1][1]) or \
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(raw[-1][0] == 'C' and raw[0][1] == [raw[-1][1][-2], raw[-1][1][-1]]) \
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: #if first is last point the path is also closed. The "Z" command is not required
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isClosed = True
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if self.options.path_types == "open_paths" and isClosed is True:
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continue #skip this loop iteration
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elif self.options.path_types == "closed_paths" and isClosed is False:
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continue #skip this loop iteration
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scale_factor = self.options.clipperscale # 2 ** 32 = 1024 - see also https://github.com/fonttools/pyclipper/wiki/Deprecating-SCALING_FACTOR
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pco = pyclipper.PyclipperOffset(self.options.miterlimit)
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JT = None #join types
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if self.options.jointype == "0":
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JT = pyclipper.JT_SQUARE
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elif self.options.jointype == "1":
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JT = pyclipper.JT_ROUND
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elif self.options.jointype == "2":
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JT = pyclipper.JT_MITER
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ET = None #end types
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if self.options.endtype == "0":
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ET = pyclipper.ET_CLOSEDPOLYGON
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elif self.options.endtype == "1":
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ET = pyclipper.ET_CLOSEDLINE
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elif self.options.endtype == "2":
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ET = pyclipper.ET_OPENBUTT
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elif self.options.endtype == "3":
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ET = pyclipper.ET_OPENSQUARE
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elif self.options.endtype == "4":
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ET = pyclipper.ET_OPENROUND
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newPaths = []
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# load in initial paths
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for subPath in csp:
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sub_simple = []
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for item in subPath:
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itemx = [float(z) * scale_factor for z in item[1]]
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sub_simple.append(itemx)
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pco.AddPath(sub_simple, JT, ET)
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# calculate offset paths for different offset amounts
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offset_list = []
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offset_list.append(self.options.init_offset * unit_factor)
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for i in range(0, self.options.offset_count):
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ofs_increase = +math.pow(float(i) * self.options.offset_increase * unit_factor, 2)
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if self.options.offset_increase < 0:
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ofs_increase = -ofs_increase
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offset_list.append(offset_list[0] + float(i) * self.options.offset * unit_factor + ofs_increase * unit_factor)
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solutions = []
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for offset in offset_list:
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solution = pco.Execute(offset * scale_factor)
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solutions.append(solution)
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if len(solution) <= 0:
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continue # no more loops to go, will provide no results.
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# re-arrange solutions to fit expected format & add to array
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for solution in solutions:
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for sol in solution:
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solx = [[float(s[0]) / scale_factor, float(s[1]) / scale_factor] for s in sol]
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sol_p = [[a, a, a] for a in solx]
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sol_p.append(sol_p[0][:])
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if sol_p not in newPaths:
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newPaths.append(sol_p)
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if self.options.individual is True:
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parentGroup = pathElement.getparent().add(inkex.Group(id="g-offset-{}".format(pathElement.attrib["id"])))
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parent = pathElement.getparent()
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idx = parent.index(pathElement) + 1
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idSuffix = 0
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for newPath in newPaths:
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copyElement = copy.copy(pathElement)
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elementId = copyElement.get('id')
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copyElement.path = CubicSuperPath(newPath)
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copyElement.set('id', elementId + str(idSuffix))
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parentGroup.append(copyElement)
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idSuffix += 1
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parent.insert(idx, parentGroup)
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if self.options.copy_org is False:
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pathElement.delete()
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else:
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if self.options.copy_org is True:
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for subPath in csp:
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newPaths.append(subPath)
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pathElement.set('d', CubicSuperPath(newPaths))
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if __name__ == '__main__':
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OffsetPaths().run()
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