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fix error tri_incenter

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Justin Lin
2021-07-10 15:36:45 +08:00
parent 3ea7909853
commit 21012a76fe
1 changed files with 7 additions and 10 deletions
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17
src/experimental/convex_offset.scad
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@@ -1,21 +1,18 @@
use <triangle/tri_incenter.scad>;
function convex_offset(vertices, d) =
let(
c = tri_incenter(vertices),
leng_vertices = len(vertices)
)
let(leng_vertices = len(vertices))
[
for(i = [0:leng_vertices - 1])
let(
curr_p = vertices[i],
next_p = vertices[(i + 1) % leng_vertices],
v1 = c - curr_p,
pre_p = vertices[(i + leng_vertices - 1) % leng_vertices],
v1 = pre_p - curr_p,
v2 = next_p - curr_p,
leng_v1 = norm(v1),
leng_v2 = norm(v2),
a = acos((v1 * v2) / (leng_v1 * leng_v2)),
leng = -d / sin(a)
a = acos((v1 * v2) / (norm(v1) * norm(v2))),
leng = -d * sin(a / 2),
v = tri_incenter([curr_p, next_p, pre_p]) - curr_p
)
v1 / leng_v1 * leng + curr_p
v / norm(v) * leng + curr_p
];