Python script, ASCII text executable
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import inkex
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import inkex.transforms
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import inkex.colors
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import io
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import colorsys
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def get_fill(elem):
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if elem.get("fill"):
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return elem.get("fill")
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if elem.style.get("fill"):
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return elem.style["fill"]
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return "#000000"
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def get_bottom_edge_colour(elem):
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fill = inkex.colors.Color(get_fill(elem))
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h, s, l = fill.to("hsl").hue / 255 * 360, fill.to("hsl").saturation / 255 * 100, fill.to("hsl").lightness / 255 * 100
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if s < 10:
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if l > 80:
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return "#212121", 0.1
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return "#212121", 0.2
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if 203 < h <= 315:
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return "#1A237E", 0.2
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if 65 < h <= 203:
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return "#263238", 0.2
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if 25 < h <= 65:
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return "#BF360C", 0.2
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return "#3E2723", 0.2
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def get_top_edge_colour(elem):
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fill = inkex.colors.Color(get_fill(elem))
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h, s, l = fill.to("hsl").hue / 255 * 360, fill.to("hsl").saturation / 255 * 100, fill.to("hsl").lightness / 255 * 100
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if s < 10 and l > 80:
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return "#ffffff", 0.4
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return "#ffffff", 0.2
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class MaterialShading(inkex.EffectExtension):
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def effect(self):
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selected = list(self.svg.selection)
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dy = self.svg.unittouu("1px")
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if not selected:
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inkex.errormsg("Select one or more paths or path-convertible objects first!")
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return
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ids_to_difference = []
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for elem in selected:
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shifted_up = elem.copy()
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parent = elem.getparent()
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index = parent.index(elem)
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shifted_up = elem.copy()
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shifted_up.transform = elem.transform @ inkex.transforms.Transform(f"translate(0, {-dy})")
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parent.insert(index + 1, shifted_up)
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shifted_down = elem.copy()
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shifted_down.transform = elem.transform @ inkex.transforms.Transform(f"translate(0, {dy})")
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parent.insert(index + 1, shifted_down)
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copy_1 = elem.copy()
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copy_1.style["fill"], copy_1.style["fill-opacity"] = get_bottom_edge_colour(elem)
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parent.insert(index + 1, copy_1)
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copy_2 = elem.copy()
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copy_2.style["fill"], copy_2.style["fill-opacity"] = get_top_edge_colour(elem)
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parent.insert(index + 1, copy_2)
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ids_to_difference.append(",".join((copy_1.get_id(), shifted_up.get_id())))
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ids_to_difference.append(",".join((copy_2.get_id(), shifted_down.get_id())))
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svg_bytes = inkex.command.inkscape_command(
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self.document,
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actions="".join(f"select-by-id:{ids}; path-difference; select-clear; " for ids in ids_to_difference).removesuffix("; ")
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)
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self.document = inkex.load_svg(svg_bytes)
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if __name__ == "__main__":
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MaterialShading().run()
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