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refactor: re-orgnize formula
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@@ -8,13 +8,9 @@ function convex_offset(vertices, d) =
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curr_p = vertices[i],
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curr_p = vertices[i],
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next_p = vertices[(i + 1) % leng_vertices],
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next_p = vertices[(i + 1) % leng_vertices],
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pre_p = vertices[(i + leng_vertices - 1) % leng_vertices],
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pre_p = vertices[(i + leng_vertices - 1) % leng_vertices],
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c = tri_incenter([curr_p, next_p, pre_p]),
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v1 = tri_incenter([curr_p, next_p, pre_p]) - curr_p,
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v1 = c - curr_p,
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v2 = next_p - curr_p,
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v2 = next_p - curr_p,
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leng_v1 = norm(v1),
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s = -d / sqrt(v1 * v1 - (v1 * v2) ^ 2 / (v2 * v2))
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leng_v2 = norm(v2),
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a = acos((v1 * v2) / (leng_v1 * leng_v2)),
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leng = -d / sin(a)
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)
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)
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v1 / leng_v1 * leng + curr_p
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v1 * s + curr_p
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];
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];
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