FabLab_Chemnitz/mightyscape-1.2
FabLab_Chemnitz/mightyscape-1.2
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modernize chain_paths

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This commit is contained in:
Mario Voigt 2024-01-17 11:17:11 +01:00
parent 06f19fd0f0
commit bca5dc270e
2 changed files with 28 additions and 25 deletions
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1
extensions/fablabchemnitz/chain_paths/chain_paths.inx
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@ -12,6 +12,7 @@
</param>
<param name="snap_ends" type="bool" gui-text="Snap connecting ends together">false</param>
<param name="close_loops" type="bool" gui-text="Close loops (start/end of the same path)">true</param>
<param name="debug" type="bool" gui-text="Debug output">false</param>
<!-- Keep in sync with chain_paths.py line 19 __version__ = ... -->
<label appearance="url">https://github.com/fablabnbg/inkscape-chain-paths</label>
<label>Version 0.7</label>

50
extensions/fablabchemnitz/chain_paths/chain_paths.py
View File

@ -34,7 +34,6 @@ import re
import inkex
from inkex.paths import CubicSuperPath, Path
from optparse import SUPPRESS_HELP
debug = False
class ChainPaths(inkex.EffectExtension):
@ -56,6 +55,7 @@ class ChainPaths(inkex.EffectExtension):
self.arg_parser.add_argument('-c', '--close_loops', type=inkex.Boolean, default=True, help='close loops (start/end of the same path)')
self.arg_parser.add_argument('-u', '--units', default="mm", help="measurement unit for epsilon")
self.arg_parser.add_argument('-e', '--chain_epsilon', type=float, default=0.01, help="Max. distance to connect [mm]")
self.arg_parser.add_argument('-d', '--debug', type=inkex.Boolean, default=False, help='Debug')
def version(self):
return __version__
@ -84,7 +84,7 @@ class ChainPaths(inkex.EffectExtension):
if not id in self.segments_done:
self.segments_done[id] = {}
self.segments_done[id][n] = True
if debug: inkex.utils.debug("done "+str(id)+" "+str(n)+" "+msg)
if self.options.debug: inkex.utils.debug("done {} {} {}".format(id, n, msg))
def is_segment_done(self, id, n):
if not id in self.segments_done:
@ -125,15 +125,17 @@ class ChainPaths(inkex.EffectExtension):
return True
def effect(self):
if self.options.version:
so = self.options
if so.version:
print(__version__)
sys.exit(0)
self.calc_unit_factor(self.options.units)
if self.options.snap_ends is not None: self.snap_ends = self.options.snap_ends
if self.options.close_loops is not None: self.close_loops = self.options.close_loops
if self.options.chain_epsilon is not None: self.chain_epsilon = self.options.chain_epsilon
if so.snap_ends is not None: self.snap_ends = so.snap_ends
if so.close_loops is not None: self.close_loops = so.close_loops
if so.chain_epsilon is not None: self.chain_epsilon = so.chain_epsilon
if self.chain_epsilon < 0.001: self.chain_epsilon = 0.001 # keep a minimum.
self.eps_sq = self.chain_epsilon * self.unit_factor * self.chain_epsilon * self.unit_factor
@ -144,9 +146,9 @@ class ChainPaths(inkex.EffectExtension):
segments = []
for id, node in self.svg.selected.items():
if node.tag != inkex.addNS('path', 'svg'):
inkex.errormsg("Object " + id + " is not a path. Try\n - Path->Object to Path\n - Object->Ungroup")
inkex.errormsg("Object {} is not a path. Try\n - Path->Object to Path\n - Object->Ungroup".format(node.get("id")))
return
if debug: inkex.utils.debug("id=" + str(id) + ", tag=" + str(node.tag))
if so.debug: inkex.utils.debug(node.get('id'))
path_d = CubicSuperPath(Path(node.get('d')))
sub_idx = -1
for sub in path_d:
@ -156,22 +158,22 @@ class ChainPaths(inkex.EffectExtension):
# [[handle0_OUT, point0, handle0_1], [handle1_0, point1, handle1_2], [handle2_1, point2, handle2_OUT]]
# the _OUT handles at the end of the path are ignored. The data structure has them identical to their points.
#
if debug: inkex.utils.debug(" sub=" + str(sub))
if so.debug: inkex.utils.debug(" sub={}".format(sub))
end1 = [sub[ 0][1][0], sub[ 0][1][1]]
end2 = [sub[-1][1][0], sub[-1][1][1]]
# Remove trivial self revesal when building candidate segments list.
if ((len(sub) == 3) and self.near_ends(end1, end2)):
if debug: inkex.utils.debug("dropping segment from self-reversing path, length:"+str(len(sub)))
if so.debug: inkex.utils.debug("dropping segment from self-reversing path, length: {}".format(len(sub)))
sub.pop()
end2 = [sub[-1][1][0], sub[-1][1][1]]
segments.append({'id': id, 'n': sub_idx, 'end1': end1, 'end2':end2, 'seg': sub})
segments.append({'id': node.get('id'), 'n': sub_idx, 'end1': end1, 'end2':end2, 'seg': sub})
if node.get(inkex.addNS('type', 'sodipodi')):
del node.attrib[inkex.addNS('type', 'sodipodi')]
if debug: inkex.utils.debug("-------- seen: ")
if so.debug: inkex.utils.debug("-------- seen: ")
for s in segments:
if debug: inkex.utils.debug(str(s['id'])+", "+str(s['n'])+", "+str(s['end1'])+", "+str(s['end2']))
if so.debug: inkex.utils.debug("{}, {}, {}, {}".format(s['id'], s['n'], s['end1'], s['end2']))
# chain the segments
obsoleted = 0
@ -184,7 +186,7 @@ class ChainPaths(inkex.EffectExtension):
cur_idx = -1
for chain in path_d:
cur_idx += 1
if not self.is_segment_done(id, cur_idx):
if not self.is_segment_done(node.get('id'), cur_idx):
# quadratic algorithm: we check both ends of the current segment.
# If one of them is near another known end from the segments list, we
# chain this segment to the current segment and remove it from the
@ -212,11 +214,11 @@ class ChainPaths(inkex.EffectExtension):
self.near_ends(end2, seg['end2'])):
seg['seg'] = self.reverse_segment(seg['seg'])
seg['end1'], seg['end2'] = seg['end2'], seg['end1']
if debug: inkex.utils.debug("reversed seg " + str(seg['id']) + ", "+str(seg['n']))
if so.debug: inkex.utils.debug("reversed seg {}, {}".format(seg['id'], seg['n']))
if self.near_ends(end1, seg['end2']):
# prepend seg to chain
self.set_segment_done(seg['id'], seg['n'], 'prepended to ' + str(id) + ' ' + str(cur_idx))
self.set_segment_done(seg['id'], seg['n'], 'prepended to {} {}'.format(node.get('id'), cur_idx))
chain = self.link_segments(seg['seg'], chain)
end1 = [chain[0][1][0], chain[0][1][1]]
segments_idx = 0 # this chain changed. re-visit all candidate
@ -224,7 +226,7 @@ class ChainPaths(inkex.EffectExtension):
if self.near_ends(end2, seg['end1']):
# append seg to chain
self.set_segment_done(seg['id'], seg['n'], 'appended to ' + str(id) + ' ' + str(cur_idx))
self.set_segment_done(seg['id'], seg['n'], 'appended to {} {}'.format(node.get('id'), cur_idx))
chain = self.link_segments(chain, seg['seg'])
end2 = [chain[-1][1][0], chain[-1][1][1]]
segments_idx = 0 # this chain changed. re-visit all candidate
@ -237,7 +239,7 @@ class ChainPaths(inkex.EffectExtension):
# Closing a path here, isolates it from the rest.
# But as we prefer to make the chain as long as possible, we close late.
if self.near_ends(end1, end2) and not path_closed and self.close_loops:
if debug: inkex.utils.debug("closing closeable loop " +str(id))
if so.debug: inkex.utils.debug("closing closeable loop {}".format(id))
if self.snap_ends:
# move first point to mid position
x1n = (chain[0][1][0] + chain[-1][1][0]) * 0.5
@ -246,7 +248,7 @@ class ChainPaths(inkex.EffectExtension):
# merge handle of the last point to the handle of the first point
dx0e = chain[-1][0][0] - chain[-1][1][0]
dy0e = chain[-1][0][1] - chain[-1][1][1]
if debug: inkex.utils.debug("handle diff: "+ str(dx0e) + str(dy0e))
if so.debug: inkex.utils.debug("handle diff: {} {}".format(dx0e, dy0e))
# FIXME: this does not work. cubicsuperpath.formatPath() ignores this handle.
chain[0][0][0], chain[0][0][1] = x1n+dx0e, y1n+dy0e
# drop last point
@ -262,20 +264,20 @@ class ChainPaths(inkex.EffectExtension):
if node.getparent() is not None:
node.delete()
obsoleted += 1
if debug: inkex.utils.debug("Path node obsoleted: " +str(id))
if so.debug: inkex.utils.debug("Path node obsoleted: {}".format(node.get('id')))
else:
remaining += 1
# BUG: All previously closed loops, are open, after we convert them back with cubicsuperpath.formatPath()
p_fmt = str(Path(CubicSuperPath(new).to_path().to_arrays()))
if path_closed: p_fmt += " z"
if debug: inkex.utils.debug("new path: "+str(p_fmt))
if so.debug: inkex.utils.debug("new path: {}".format(p_fmt))
node.set('d', p_fmt)
# statistics:
if debug: inkex.utils.debug("Path nodes obsoleted: "+str(obsoleted) + "\nPath nodes remaining:"+str(remaining))
if so.debug: inkex.utils.debug("Path nodes obsoleted: {}\nPath nodes remaining: {}".format(obsoleted, remaining))
if self.min_missed_distance_sq is not None:
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))
if debug: inkex.utils.debug("Successful link operations: "+str(self.chained_count))
if so.debug: inkex.utils.debug("min_missed_distance: {} > {}".format(math.sqrt(float(self.min_missed_distance_sq))/self.unit_factor, self.chain_epsilon)+str(so.units))
if so.debug: inkex.utils.debug("Successful link operations: {}".format(self.chained_count))
if __name__ == '__main__':
ChainPaths().run()