fix several bugs in contour scanner and trimmer extension
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@ -22,7 +22,7 @@ Extension for InkScape 1.0+
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- maybe option: convert rel path to abs path
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replacedelement.path = replacedelement.path.to_absolute().to_superpath().to_path()
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- maybe option: break apart while keeping relative/absolute commands (more complex and not sure if we have a great advantage having this)
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- if calculation of trim lines fails (bentley ottmann) we could try to sort out the lines where slope is nearly identical and then we try again
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- important to notice
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- this algorithm might be really slow. Reduce flattening quality to speed up
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@ -51,7 +51,7 @@ Extension for InkScape 1.0+
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Author: Mario Voigt / FabLab Chemnitz
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Mail: mario.voigt@stadtfabrikanten.org
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Date: 09.08.2020 (extension originally called "Contour Scanner")
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Last patch: 11.06.2021
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Last patch: 22.06.2021
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License: GNU GPL v3
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'''
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@ -73,8 +73,9 @@ if speedups.available:
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speedups.enable()
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idPrefix = "subsplit"
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intersectedVerb = "-intersected-"
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idPrefixSubSplit = "subsplit"
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idPrefixTrimming = "shapely"
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intersectedVerb = "intersected"
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class ContourScannerAndTrimmer(inkex.EffectExtension):
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@ -252,10 +253,10 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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trimLineStyle = {'stroke': str(self.options.color_trimmed), 'fill': 'none', 'stroke-width': self.options.strokewidth}
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linesWithSnappedIntersectionPoints = snap(ls, globalIntersectionPoints, self.options.snap_tolerance)
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trimGroupId = 'shapely-' + subSplitLineArray[subSplitIndex].attrib['id'].split("_")[0] #split at "_" (_ from subSplitId)
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trimGroupParentId = subSplitLineArray[subSplitIndex].attrib['id'].split(idPrefix+"-")[1].split("_")[0]
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trimGroupParentId = subSplitLineArray[subSplitIndex].attrib['originalPathId']
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trimGroupId = '{}-{}-{}'.format(idPrefixTrimming, idPrefixSubSplit, trimGroupParentId)
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trimGroupParent = self.svg.getElementById(trimGroupParentId)
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trimGroupParentTransform = trimGroupParent.composed_transform()
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#trimGroupParentTransform = trimGroupParent.composed_transform()
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trimGroup = self.find_group(trimGroupId)
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if trimGroup is None:
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trimGroup = trimGroupParent.getparent().add(inkex.Group(id=trimGroupId))
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@ -273,19 +274,19 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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trimLineId = "{}-{}".format(trimGroupId, subSplitIndex)
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splitAt.append(trimGroupId)
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if splitAt.count(trimGroupId) > 1: #we detected a lines with intersection on
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trimLineId = trimLineId + self.svg.get_unique_id(intersectedVerb)
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trimLineId = "{}-{}".format(trimLineId, self.svg.get_unique_id(intersectedVerb + "-"))
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'''
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so the previous lines was an intersection lines too. so we change the id to include the intersected verb
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(left side and right side of cut) - note: updating element
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id sometimes seems not to work if the id was used before in Inkscape
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'''
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prevLine.attrib['id'] = trimGroupId + "-" + str(subSplitIndex) + self.svg.get_unique_id(intersectedVerb)
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prevLine.attrib['id'] = "{}-{}".format(trimGroupId, str(subSplitIndex) + "-" + self.svg.get_unique_id(intersectedVerb + "-"))
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prevLine.attrib['intersected'] = 'True' #some dirty flag we need
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prevLine = trimLine = inkex.PathElement(id=trimLineId)
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x, y = trimLines[j].coords.xy
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trimLine.path = [['M', [x[0],y[0]]], ['L', [x[1],y[1]]]]
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if trimGroupParentTransform is not None:
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trimLine.path = trimLine.path.transform(-trimGroupParentTransform)
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#if trimGroupParentTransform is not None:
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# trimLine.path = trimLine.path.transform(-trimGroupParentTransform)
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if self.options.apply_style_to_trimmed is False:
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trimLine.style = trimLineStyle
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else:
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@ -301,15 +302,16 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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allTrimGroups = allTrimGroups[::-1]
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for trimGroup in allTrimGroups:
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for element in trimGroup:
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if element.path not in totalTrimPaths:
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totalTrimPaths.append(element.path)
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path = element.path.transform(element.composed_transform())
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if path not in totalTrimPaths:
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totalTrimPaths.append(path)
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else:
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if self.options.show_debug is True:
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self.msg("Deleting {}".format(element.get('id')))
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self.msg("Deleting path {}".format(element.get('id')))
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element.delete()
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if len(trimGroup) == 0:
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if self.options.show_debug is True:
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self.msg("Deleting {}".format(trimGroup.get('id')))
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self.msg("Deleting group {}".format(trimGroup.get('id')))
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trimGroup.delete()
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@ -564,7 +566,7 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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continue #skip this loop iteration
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if so.draw_subsplit is True:
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subSplitLineGroup = pathElement.getparent().add(inkex.Group(id="{}-{}".format(idPrefix, originalPathId)))
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subSplitLineGroup = pathElement.getparent().add(inkex.Group(id="{}-{}".format(idPrefixSubSplit, originalPathId)))
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#get all sub paths for the path of the element
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subPaths, prev = [], 0
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@ -601,7 +603,7 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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for i in range(len(segs) - 1): #we could do the same routine to build up polylines using "for x, y in node.path.end_points". See "number nodes" extension
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x1, y1, x2, y2 = self.line_from_segments(segs, i, so.decimals)
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#self.msg("(y1 = {},y2 = {},x1 = {},x2 = {})".format(x1, y1, x2, y2))
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subSplitId = "{}-{}_{}".format(idPrefix, originalPathId, i)
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subSplitId = "{}-{}-{}".format(idPrefixSubSplit, originalPathId, i)
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line = inkex.PathElement(id=subSplitId)
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#apply line path with composed negative transform from parent element
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line.path = [['M', [x1, y1]], ['L', [x2, y2]]]
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@ -721,8 +723,18 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
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allSubSplitLineStrings = []
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for subSplitLine in subSplitLineArray:
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csp = subSplitLine.path.to_arrays()
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allSubSplitLineStrings.append([(csp[0][1][0], csp[0][1][1]), (csp[1][1][0], csp[1][1][1])])
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lineString = [(csp[0][1][0], csp[0][1][1]), (csp[1][1][0], csp[1][1][1])]
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if so.remove_duplicates is True:
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if lineString not in allSubSplitLineStrings:
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allSubSplitLineStrings.append(lineString)
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else:
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if so.show_debug is True:
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self.msg("line {} already in sub split line collection. Dropping ...".format(lineString))
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else: #if false we append all segments without filtering duplicate ones
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allSubSplitLineStrings.append(lineString)
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# Very small step sizes over near-vertical lines can cause errors. We hide exceptions with try-catch, thus we disabled the debugging in poly_point_isect:
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# by setting USE_DEBUG = False (True was default setting)
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globalIntersectionPoints = MultiPoint(isect_segments(allSubSplitLineStrings, validate=True))
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if so.show_debug is True:
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@ -26,7 +26,7 @@ __all__ = (
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# their end points form the intersection point.
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USE_IGNORE_SEGMENT_ENDINGS = True
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USE_DEBUG = True
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USE_DEBUG = False
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USE_VERBOSE = False
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