281 lines
12 KiB
Python
281 lines
12 KiB
Python
#!/usr/bin/env python3
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#
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# Inkscape extension making long continuous paths from shorter pieces.
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# (C) 2015 juewei@fabmail.org
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#
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# code snippets visited to learn the extension 'effect' interface:
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# - convert2dashes.py
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# - http://github.com/jnweiger/inkscape-silhouette
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# - http://github.com/jnweiger/inkscape-gears-dev
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# - http://sourceforge.net/projects/inkcut/
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# - http://code.google.com/p/inkscape2tikz/
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# - http://code.google.com/p/eggbotcode/
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#
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# 2015-11-15 jw, V0.1 -- initial draught
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# 2015-11-16 jw, V0.2 -- fixed endpoints after chaining.
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# 2015-11-16 jw, V0.3 -- all possible chains connected. Yeah
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# 2015-11-16 jw, V0.4 -- gui fully functional.
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# 2015-11-26 jw, V0.5 -- HACK to resolve some self-reversing path segments.
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# https://github.com/fablabnbg/inkscape-chain-paths/issues/1
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# 2020-04-10 jw, V0.6 -- Close paths correctly. Self reversing path hack was too eager.
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# Workaround for cubicsuperpath.parsePath/formatPath limitation.
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# Started python3 compatibility.
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# 2020-05-27 vi, V0.7 -- Upgrade to Inkscape 1.0. Write debug info to inkex debug dialog.
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from __future__ import print_function
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__version__ = '0.7' # Keep in sync with chain_paths.inx ca line 22
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__author__ = 'Juergen Weigert <juergen@fabmail.org>'
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__credits__ = ['Juergen Weigert', 'Veronika Irvine']
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import sys
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import math
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import re
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import inkex
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from inkex.paths import CubicSuperPath, Path
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from optparse import SUPPRESS_HELP
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debug = False
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class ChainPaths(inkex.EffectExtension):
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def __init__(self):
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inkex.Effect.__init__(self)
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# For handling an SVG viewbox attribute, we will need to know the
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# values of the document's <svg> width and height attributes as well
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# as establishing a transform from the viewbox to the display.
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self.chain_epsilon = 0.01
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self.snap_ends = True
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self.close_loops = True
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self.segments_done = {}
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self.min_missed_distance_sq = None
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self.chained_count = 0
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self.arg_parser.add_argument('-V', '--version', type=inkex.Boolean, default=False, help = 'Just print version number ("' + __version__ + '") and exit.')
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self.arg_parser.add_argument('-s', '--snap_ends', type=inkex.Boolean, default=True, help='snap end-points together when connecting')
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self.arg_parser.add_argument('-c', '--close_loops', type=inkex.Boolean, default=True, help='close loops (start/end of the same path)')
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self.arg_parser.add_argument('-u', '--units', default="mm", help="measurement unit for epsilon")
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self.arg_parser.add_argument('-e', '--chain_epsilon', type=float, default=0.01, help="Max. distance to connect [mm]")
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def version(self):
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return __version__
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def author(self):
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return __author__
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def calc_unit_factor(self, units='mm'):
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""" return the scale factor for all dimension conversions.
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- The document units are always irrelevant as
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everything in inkscape is expected to be in 90dpi pixel units
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"""
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dialog_units = self.svg.unittouu(str(1.0)+units)
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self.unit_factor = 1.0 / dialog_units
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return self.unit_factor
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def reverse_segment(self, seg):
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r = []
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for s in reversed(seg):
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# s has 3 elements: handle1, point, handle2
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# Swap handles.
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s.reverse()
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r.append(s)
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return r
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def set_segment_done(self, id, n, msg=''):
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if not id in self.segments_done:
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self.segments_done[id] = {}
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self.segments_done[id][n] = True
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if debug: inkex.utils.debug("done "+str(id)+" "+str(n)+" "+msg)
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def is_segment_done(self, id, n):
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if not id in self.segments_done:
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return False
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if n in self.segments_done[id]:
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return True
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return False
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def link_segments(self, seg1, seg2):
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if self.snap_ends:
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seg = seg1[:-1]
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p1 = seg1[-1]
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p2 = seg2[0]
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# fuse p1 and p2 to create one new point:
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# first handle from p1, point coordinates averaged, second handle from p2
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seg.append([ [ p1[0][0] , p1[0][1] ],
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[ (p1[1][0] + p2[1][0]) * .5, (p1[1][1] + p2[1][1]) * .5 ],
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[ p2[2][0] , p2[2][1] ] ])
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seg.extend(seg2[1:])
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else:
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seg = seg1[:]
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seg.extend(seg2[:])
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self.chained_count += 1
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return seg
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def near_ends(self, end1, end2):
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""" requires self.eps_sq to be the square of the near distance """
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dx = end1[0] - end2[0]
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dy = end1[1] - end2[1]
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d_sq = dx * dx + dy * dy
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if d_sq > self.eps_sq:
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if self.min_missed_distance_sq is None:
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self.min_missed_distance_sq = d_sq
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elif self.min_missed_distance_sq > d_sq:
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self.min_missed_distance_sq = d_sq
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return False
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else:
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return True
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def effect(self):
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if self.options.version:
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print(__version__)
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sys.exit(0)
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self.calc_unit_factor(self.options.units)
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if self.options.snap_ends is not None: self.snap_ends = self.options.snap_ends
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if self.options.close_loops is not None: self.close_loops = self.options.close_loops
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if self.options.chain_epsilon is not None: self.chain_epsilon = self.options.chain_epsilon
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if self.chain_epsilon < 0.001: self.chain_epsilon = 0.001 # keep a minimum.
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self.eps_sq = self.chain_epsilon * self.unit_factor * self.chain_epsilon * self.unit_factor
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if not len(self.svg.selected.items()):
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inkex.errormsg("Please select one or more objects.")
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return
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segments = []
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for id, node in self.svg.selected.items():
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if node.tag != inkex.addNS('path', 'svg'):
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inkex.errormsg("Object " + id + " is not a path. Try\n - Path->Object to Path\n - Object->Ungroup")
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return
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if debug: inkex.utils.debug("id=" + str(id) + ", tag=" + str(node.tag))
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path_d = CubicSuperPath(Path(node.get('d')))
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sub_idx = -1
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for sub in path_d:
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sub_idx += 1
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# sub = [[[200.0, 300.0], [200.0, 300.0], [175.0, 290.0]], [[175.0, 265.0], [220.37694, 256.99876], [175.0, 240.0]], [[175.0, 215.0], [200.0, 200.0], [200.0, 200.0]]]
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# this is a path of three points. All the bezier handles are included. the Structure is:
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# [[handle0_OUT, point0, handle0_1], [handle1_0, point1, handle1_2], [handle2_1, point2, handle2_OUT]]
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# the _OUT handles at the end of the path are ignored. The data structure has them identical to their points.
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#
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if debug: inkex.utils.debug(" sub=" + str(sub))
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end1 = [sub[ 0][1][0], sub[ 0][1][1]]
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end2 = [sub[-1][1][0], sub[-1][1][1]]
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# Remove trivial self revesal when building candidate segments list.
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if ((len(sub) == 3) and self.near_ends(end1, end2)):
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if debug: inkex.utils.debug("dropping segment from self-reversing path, length:"+str(len(sub)))
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sub.pop()
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end2 = [sub[-1][1][0], sub[-1][1][1]]
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segments.append({'id': id, 'n': sub_idx, 'end1': end1, 'end2':end2, 'seg': sub})
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if node.get(inkex.addNS('type', 'sodipodi')):
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del node.attrib[inkex.addNS('type', 'sodipodi')]
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if debug: inkex.utils.debug("-------- seen: ")
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for s in segments:
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if debug: inkex.utils.debug(str(s['id'])+", "+str(s['n'])+", "+str(s['end1'])+", "+str(s['end2']))
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# chain the segments
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obsoleted = 0
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remaining = 0
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for id, node in self.svg.selected.items():
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path_d = CubicSuperPath(Path(node.get('d')))
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# ATTENTION: for parsePath() it is the same, if first and last point coincide, or if the path is really closed.
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path_closed = True if re.search("z\s*$", node.get('d')) else False
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new = []
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cur_idx = -1
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for chain in path_d:
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cur_idx += 1
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if not self.is_segment_done(id, cur_idx):
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# quadratic algorithm: we check both ends of the current segment.
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# If one of them is near another known end from the segments list, we
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# chain this segment to the current segment and remove it from the
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# list,
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# end1-end1 or end2-end2: The new segment is reversed.
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# end1-end2: The new segment is prepended to the current segment.
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# end2-end1: The new segment is appended to the current segment.
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self.set_segment_done(id, cur_idx, "output") # do not cross with ourselves.
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end1 = [chain[ 0][1][0], chain[ 0][1][1]]
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end2 = [chain[-1][1][0], chain[-1][1][1]]
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# Remove trivial self revesal when doing the actual chain operation.
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if ((len(chain) == 3) and self.near_ends(end1, end2)):
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chain.pop()
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end2 = [chain[-1][1][0], chain[-1][1][1]]
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segments_idx = 0
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while segments_idx < len(segments):
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seg = segments[segments_idx]
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if self.is_segment_done(seg['id'], seg['n']):
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segments_idx += 1
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continue
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if (self.near_ends(end1, seg['end1']) or
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self.near_ends(end2, seg['end2'])):
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seg['seg'] = self.reverse_segment(seg['seg'])
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seg['end1'], seg['end2'] = seg['end2'], seg['end1']
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if debug: inkex.utils.debug("reversed seg " + str(seg['id']) + ", "+str(seg['n']))
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if self.near_ends(end1, seg['end2']):
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# prepend seg to chain
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self.set_segment_done(seg['id'], seg['n'], 'prepended to ' + str(id) + ' ' + str(cur_idx))
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chain = self.link_segments(seg['seg'], chain)
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end1 = [chain[0][1][0], chain[0][1][1]]
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segments_idx = 0 # this chain changed. re-visit all candidate
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continue
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if self.near_ends(end2, seg['end1']):
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# append seg to chain
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self.set_segment_done(seg['id'], seg['n'], 'appended to ' + str(id) + ' ' + str(cur_idx))
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chain = self.link_segments(chain, seg['seg'])
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end2 = [chain[-1][1][0], chain[-1][1][1]]
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segments_idx = 0 # this chain changed. re-visit all candidate
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continue
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segments_idx += 1
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# Now all joinable segments are joined.
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# Finally, we can check, if the resulting path is a closed path:
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# Closing a path here, isolates it from the rest.
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# But as we prefer to make the chain as long as possible, we close late.
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if self.near_ends(end1, end2) and not path_closed and self.close_loops:
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if debug: inkex.utils.debug("closing closeable loop " +str(id))
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if self.snap_ends:
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# move first point to mid position
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x1n = (chain[0][1][0] + chain[-1][1][0]) * 0.5
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y1n = (chain[0][1][1] + chain[-1][1][1]) * 0.5
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chain[0][1][0], chain[0][1][1] = x1n, y1n
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# merge handle of the last point to the handle of the first point
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dx0e = chain[-1][0][0] - chain[-1][1][0]
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dy0e = chain[-1][0][1] - chain[-1][1][1]
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if debug: inkex.utils.debug("handle diff: "+ str(dx0e) + str(dy0e))
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# FIXME: this does not work. cubicsuperpath.formatPath() ignores this handle.
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chain[0][0][0], chain[0][0][1] = x1n+dx0e, y1n+dy0e
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# drop last point
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chain.pop()
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end2 = [chain[-1][1][0], chain[-1][1][1]]
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path_closed = True
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self.chained_count +=1
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new.append(chain)
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if not len(new):
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# node.clear()
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if node.getparent() is not None:
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node.delete()
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obsoleted += 1
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if debug: inkex.utils.debug("Path node obsoleted: " +str(id))
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else:
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remaining += 1
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# BUG: All previously closed loops, are open, after we convert them back with cubicsuperpath.formatPath()
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p_fmt = str(Path(CubicSuperPath(new).to_path().to_arrays()))
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if path_closed: p_fmt += " z"
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if debug: inkex.utils.debug("new path: "+str(p_fmt))
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node.set('d', p_fmt)
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# statistics:
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if debug: inkex.utils.debug("Path nodes obsoleted: "+str(obsoleted) + "\nPath nodes remaining:"+str(remaining))
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if self.min_missed_distance_sq is not None:
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if debug: inkex.utils.debug("min_missed_distance: "+str(math.sqrt(float(self.min_missed_distance_sq))/self.unit_factor)+'>'+str(self.chain_epsilon)+str(self.options.units))
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if debug: inkex.utils.debug("Successful link operations: "+str(self.chained_count))
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if __name__ == '__main__':
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ChainPaths().run() |