78 lines
3.6 KiB
Python
78 lines
3.6 KiB
Python
#!/usr/bin/env python3
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"""
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For each selected path element, this extension creates an additional path element
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consisting of horizontal line segments which are the same size as the original
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line segments. Has option to extrude as a band (add height; adds vertical lines and another horizontal path)
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ToDo:
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- option to colorize each line segment of the original curve (we need to split and group the original one to do this). We map the colors to the unwinded paths
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- handle combined paths correctly
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- copy style of input paths and only apply new colors
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"""
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import inkex
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from inkex import bezier
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from lxml import etree
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import math
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class UnwindPaths(inkex.EffectExtension):
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#draw an SVG line segment between the given (raw) points
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def drawline(self, pathData, name, parent):
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line_style = {'stroke':'#000000','stroke-width':'1px','fill':'none'}
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line_attribs = {'style' : str(inkex.Style(line_style)),
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inkex.addNS('label','inkscape') : name,
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'd' : pathData}
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line = etree.SubElement(parent, inkex.addNS('path','svg'), line_attribs )
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def add_arguments(self, pars):
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pars.add_argument('--extrude', type=inkex.Boolean, default=False)
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pars.add_argument('--extrude_height', type=float, default=10.000)
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pars.add_argument('--unit', default="mm")
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def effect(self):
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path_num = 0
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shifting = self.svg.unittouu(str(self.options.extrude_height) + self.options.unit)
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for element in self.svg.selection.filter(inkex.PathElement).values():
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elemGroup = self.svg.get_current_layer().add(inkex.Group(id="unwinding-" + element.get('id')))
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#beginning point of the unwind band:
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bbox = element.bounding_box() #shift the element to the bottom of the element
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xmin = bbox.left
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ymax = bbox.bottom
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for sub in element.path.to_superpath():
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new = []
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new.append([sub[0]])
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i = 1
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topPathData = "m {:0.6f},{:0.6f} ".format(xmin, ymax)
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bottomPathData = "m {:0.6f},{:0.6f} ".format(xmin, ymax + shifting)
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lengths = []
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while i <= len(sub) - 1:
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length = bezier.cspseglength(new[-1][-1], sub[i]) #sub path length
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lengths.append(length)
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segment = "l {:0.6f},{:0.0f} ".format(length, 0)
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topPathData += segment
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bottomPathData += segment
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new[-1].append(sub[i])
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i += 1
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self.drawline(topPathData, "hline-top-{0}".format(element.get('id')), elemGroup)
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if self.options.extrude is True:
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self.drawline(bottomPathData, "hline-bottom-{0}".format(element.get('id')), elemGroup)
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#draw as much vertical lines as segments in bezier + start + end vertical line
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin, ymax, shifting),"vline{0}".format(path_num), elemGroup)
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin + sum([length for length in lengths]), ymax, shifting),"vline{0}".format(path_num), elemGroup)
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x = 0
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for n in range(0, i-1):
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x += lengths[n]
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self.drawline("m {:0.6f},{:0.6f} v {:0.6f}".format(xmin + x, ymax, shifting),"vline{0}".format(path_num), elemGroup)
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if __name__ == '__main__':
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UnwindPaths().run()
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