168 lines
6.9 KiB
Python
168 lines
6.9 KiB
Python
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#!/usr/bin/env python3
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'''
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Inkscape extension to subdivide the selected bezier paths based on max length value or count
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Copyright (C) 2018 Shrinivas Kulkarni
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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'''
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import inkex
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from inkex import bezier
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from inkex.paths import CubicSuperPath
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import bezmisc
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import simpletransform
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import copy
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from math import ceil
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DEF_ERR_MARGIN = 0.0001
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def getPartsFromCubicSuper(cspath):
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parts = []
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for subpath in cspath:
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part = []
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prevBezPt = None
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for i, bezierPt in enumerate(subpath):
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if(prevBezPt != None):
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seg = [prevBezPt[1], prevBezPt[2], bezierPt[0], bezierPt[1]]
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part.append(seg)
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prevBezPt = bezierPt
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parts.append(part)
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return parts
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def getCubicSuperFromParts(parts):
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cbsuper = []
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for part in parts:
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subpath = []
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lastPt = None
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pt = None
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for seg in part:
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if(pt == None):
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ptLeft = seg[0]
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pt = seg[0]
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ptRight = seg[1]
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subpath.append([ptLeft, pt, ptRight])
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ptLeft = seg[2]
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pt = seg[3]
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subpath.append([ptLeft, pt, pt])
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cbsuper.append(subpath)
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return cbsuper
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def floatCmpWithMargin(float1, float2, margin = DEF_ERR_MARGIN):
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return abs(float1 - float2) < margin
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class SubdividePathEffect(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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self.arg_parser.add_argument('--maxLength', type = float, default = '10', help = 'Maximum Length of New Segments')
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self.arg_parser.add_argument('--unit', default = 'mm', help = 'Unit of Measurement')
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self.arg_parser.add_argument('--precision', type = int, default = '5', help = 'Number of significant digits')
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self.arg_parser.add_argument("--tab", default="sampling", help="Tab")
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self.arg_parser.add_argument("--separateSegs", type=inkex.Boolean, default=True)
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def effect(self):
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maxL = None
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separateSegs = self.options.separateSegs
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if(self.options.unit != 'perc' and self.options.unit != 'count'):
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maxL = self.options.maxLength * self.svg.unittouu('1'+self.options.unit)
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# ~ inkex.errormsg(_(str(maxL)))
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tolerance = 10 ** (-1 * self.options.precision)
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selections = self.svg.selected
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pathNodes = self.document.xpath('//svg:path',namespaces=inkex.NSS)
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paths = [(pathNode.get('id'), CubicSuperPath(pathNode.get('d'))) for pathNode in pathNodes]
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if(len(paths) > 0):
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for key, cspath in paths:
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parts = getPartsFromCubicSuper(cspath)
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partsSplit = False
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for i, part in enumerate(parts):
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newSegs = []
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for j, seg in enumerate(part):
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segL = bezmisc.bezierlengthSimpson((seg[0], seg[1], seg[2], seg[3]), tolerance = tolerance)
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if(maxL != None):
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divL = maxL
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elif(self.options.unit == 'perc'):
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divL = segL * self.options.maxLength / 100
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else:
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divL = segL / ceil(self.options.maxLength)
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if(segL > divL):
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coveredL = 0
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s = seg
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s1 = None
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s2 = DEF_ERR_MARGIN #Just in case
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while(not floatCmpWithMargin(segL, coveredL)):
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if(s == seg):
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sL = segL
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else:
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sL = bezmisc.bezierlengthSimpson((s[0], s[1], s[2], s[3]), tolerance = tolerance)
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if(floatCmpWithMargin(segL, coveredL + divL)):
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s2 = s
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break
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else:
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if(segL > (coveredL + divL)):
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t1L = divL
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else:
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t1L = segL - coveredL
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t1 = bezier.beziertatlength((s[0], s[1], s[2], s[3]), l = t1L / sL , tolerance = tolerance)
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s1, s2 = bezier.beziersplitatt((s[0], s[1], s[2], s[3]), t1)
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coveredL += t1L
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newSegs.append(s1)
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s = s2
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newSegs.append(s2)
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else:
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newSegs.append(seg)
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if(len(newSegs) > len(part)):
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parts[i] = newSegs
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partsSplit = True
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if(partsSplit or separateSegs):
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elem = selections[key]
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if(separateSegs):
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parent = elem.getparent()
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idx = parent.index(elem)
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parent.remove(elem)
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allSegs = [seg for part in parts for seg in part]
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idSuffix = 0
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for seg in allSegs:
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cspath = getCubicSuperFromParts([[seg]])
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newElem = copy.copy(elem)
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oldId = newElem.get('id')
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newElem.set('d', CubicSuperPath(cspath))
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newElem.set('id', oldId + str(idSuffix).zfill(5))
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parent.insert(idx, newElem)
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idSuffix += 1
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else:
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cspath = getCubicSuperFromParts(parts)
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elem.set('d', CubicSuperPath(cspath))
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SubdividePathEffect().run()
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