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mightyscape-1.1-deprecated/extensions/fablabchemnitz_ofsplot.py

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#!/usr/bin/env python3
import inkex
import math
from inkex.paths import CubicSuperPath
import re
import pyclipper
class ofsplot(inkex.Effect):
def __init__(self):
inkex.Effect.__init__(self)
self.arg_parser.add_argument("--count", type=int, default=10, help="Number of offset operations")
self.arg_parser.add_argument("--offset", type=float, default=2.0, help="Offset amount")
self.arg_parser.add_argument("--init_offset", type=float, default=2.0, help="Initial Offset Amount")
self.arg_parser.add_argument("--copy_org", type=inkex.Boolean, default=True, help="copy original path")
self.arg_parser.add_argument("--offset_increase", type=float, default=2.0, help="Offset increase between iterations")
self.arg_parser.add_argument("--jointype", default="2", help="Join type")
self.arg_parser.add_argument("--miterlimit", type=float, default=3.0, help="Miter limit")
self.arg_parser.add_argument("--clipperscale", type=float, default=1024.0, help="Scaling factor")
def effect(self):
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paths = self.svg.get_selected(inkex.PathElement)
count = sum(1 for path in paths)
paths = self.svg.get_selected(inkex.PathElement) #we need to call this twice because the sum function consumes the generator
if count == 0:
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inkex.errormsg("No paths selected.")
exit()
for path in paths:
if path.tag == inkex.addNS('path','svg'):
p = CubicSuperPath(path.get('d'))
scale_factor = self.options.clipperscale # 2 ** 32 = 1024 - see also https://github.com/fonttools/pyclipper/wiki/Deprecating-SCALING_FACTOR
pco = pyclipper.PyclipperOffset(self.options.miterlimit)
JT = pyclipper.JT_MITER
if self.options.jointype == "0":
JT = pyclipper.JT_SQUARE
elif self.options.jointype == "1":
JT = pyclipper.JT_ROUND
elif self.options.jointype == "2":
JT = pyclipper.JT_MITER
new = []
# load in initial paths
for sub in p:
sub_simple = []
for item in sub:
itemx = [float(z)*scale_factor for z in item[1]]
sub_simple.append(itemx)
pco.AddPath(sub_simple, JT, pyclipper.ET_CLOSEDPOLYGON)
# calculate offset paths for different offset amounts
offset_list = []
offset_list.append(self.options.init_offset)
for i in range(0,self.options.count+1):
ofs_inc = +math.pow(float(i)*self.options.offset_increase,2)
if self.options.offset_increase <0:
ofs_inc = -ofs_inc
offset_list.append(offset_list[0]+float(i)*self.options.offset+ofs_inc)
solutions = []
for offset in offset_list:
solution = pco.Execute(offset * scale_factor)
solutions.append(solution)
if len(solution)<=0:
continue # no more loops to go, will provide no results.
# re-arrange solutions to fit expected format & add to array
for solution in solutions:
for sol in solution:
solx = [[float(s[0]) / scale_factor, float(s[1]) / scale_factor] for s in sol]
sol_p = [[a,a,a] for a in solx]
sol_p.append(sol_p[0][:])
new.append(sol_p)
# add old, just to keep (make optional!)
if self.options.copy_org:
for sub in p:
new.append(sub)
path.set('d',CubicSuperPath(new))
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ofsplot().run()