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32 lines
1001 B
OpenSCAD
32 lines
1001 B
OpenSCAD
/**
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* shape_pie.scad
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*
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* @copyright Justin Lin, 2017
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* @license https://opensource.org/licenses/lgpl-3.0.html
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*
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* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_pie.html
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*
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**/
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use <__comm__/__frags.scad>;
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use <__comm__/__ra_to_xy.scad>;
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function shape_pie(radius, angle) =
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let(
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a_step = 360 / __frags(radius),
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leng = radius * cos(a_step / 2),
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angles = is_num(angle) ? [0:angle] : angle,
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m = floor(angles[0] / a_step) + 1,
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n = floor(angles[1] / a_step),
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edge_r_begin = leng / cos((m - 0.5) * a_step - angles[0]),
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edge_r_end = leng / cos((n + 0.5) * a_step - angles[1]),
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shape_pts = concat(
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[[0, 0], __ra_to_xy(edge_r_begin, angles[0])],
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m > n ? [] : [
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for(i = m; i <= n; i = i + 1)
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let(a = a_step * i)
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__ra_to_xy(radius, a)
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],
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angles[1] == a_step * n ? [] : [__ra_to_xy(edge_r_end, angles[1])]
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)
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) shape_pts; |