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add shape_star

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This commit is contained in:
Justin Lin
2021-10-29 11:45:14 +08:00
parent 2376e429d1
commit faf53b3846
2 changed files with 33 additions and 0 deletions
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20
src/_impl/_shape_star_impl.scad Normal file
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function __outer_points_shape_star(r1, r2, n) =
let(
a = 360 / n
)
[for(i = 0; i < n; i = i + 1) [r1 * cos(90 + a * i), r1 * sin(90 + a * i)]];
function __inner_points_shape_star(r1, r2, n) =
let (
a = 360 / n,
half_a = a / 2
)
[for(i = 0; i < n; i = i + 1) [r2 * cos(90 + a * i + half_a), r2 * sin(90 + a * i + half_a)]];
function _shape_star_impl(r1, r2, n) =
let(
outer_points = __outer_points_shape_star(r1, r2, n),
inner_points = __inner_points_shape_star(r1, r2, n),
leng = len(outer_points)
)
[for(i = 0; i < leng; i = i + 1) each [outer_points[i], inner_points[i]]];

13
src/shape_star.scad Normal file
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/**
* shape_star.scad
*
* @copyright Justin Lin, 2021
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib3x-shape_star.html
*
**/
use <_impl/_shape_star_impl.scad>;
function shape_star(outerRadius = 1, innerRadius = 0.381966, n = 5) = _shape_star_impl(outerRadius, innerRadius, n);