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mightyscape-1.1-deprecated/extensions/fablabchemnitz/remove_redundant.py

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#!/usr/bin/env python3
'''
Copyright (C) 2010 David Turner <novalis@novalis.org>
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 St Fifth Floor, Boston, MA 02139
'''
import inkex
from inkex import paths
from collections import defaultdict
class FixedRadiusSearch():
def __init__(self, r=0.1):
self.r = r
self.seen = defaultdict(list)
def round(self, f):
return int(round(f/self.r))
def bin(self, p):
return (self.round(p[0]), self.round(p[1]))
def test(self, p, q):
return abs(self.round(p[0] - q[0])) <= 1 and abs(self.round(p[1] - q[1])) <= 1
def search(self, p):
b = self.bin(p)
for i in range(b[0]-1, b[0]+2):
for j in range(b[1]-1, b[1]+2):
for q in self.seen[(i, j)]:
if self.test(p, q):
return q
return None
def add(self, p):
self.seen[self.bin(p)].append(p)
def get_or_add(self, p):
result = self.search(p)
if result == None:
self.add(p)
return p
return result
class RemoveRedundant(inkex.EffectExtension):
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def effect(self):
seenSegments = set()
coordsCache = FixedRadiusSearch()
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for element in self.svg.selected.values():
if element.tag == inkex.addNS('path','svg'):
d = element.get('d')
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path = paths.CubicSuperPath(d).to_path().to_arrays()
newPath = []
start = prev = None
pathclosed = True
for i in range(0, len(path)):
command = path[i][0]
coords = path[i][1]
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newCoords = []
for x, y in zip(*[iter(coords)]*2):
newCoords.extend(list(coordsCache.get_or_add((x, y))))
coords = newCoords
tcoords = tuple(coords)
if command == 'M':
#remove this M command and it's point, if the next dataset conaints an M command too.
# Like "M 49.8584,109.276 M ..." which creates just a single point but not a valid path
if i+1 != len(path) and path[i][0] == path[i+1][0]:
continue
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newPath.append([command, coords])
start = prev = tcoords
pathclosed = True
elif command == 'L':
if ('L', prev, tcoords) in seenSegments or \
('L', tcoords, prev) in seenSegments:
newPath.append(['M', coords])
pathclosed = False
else:
newPath.append([command, coords])
seenSegments.add(('L', prev, tcoords))
prev = tcoords
elif command == 'Z':
if ('L', prev, start) in seenSegments or \
('L', start, prev) in seenSegments:
newPath.append(['M', start])
else:
if pathclosed:
newPath.append([command, coords])
else:
newPath.append(['L', start])
seenSegments.add(('L', prev, start))
prev = start
elif command == 'C':
if ('C', prev, tcoords) in seenSegments or \
('C', tcoords[4:], (tcoords[2:4], tcoords[0:2], prev)) in seenSegments:
newPath.append(['M', coords[4:]])
else:
newPath.append(['C', coords])
seenSegments.add(('C', prev, tcoords))
prev = tcoords[4:]
else:
newPath.append([command, coords])
while len(newPath) and newPath[-1][0] == 'M':
newPath = newPath[:-1]
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element.set('d',str(paths.Path(newPath)))
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if __name__ == '__main__':
RemoveRedundant().run()