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refactor: separate elements logic into a standalone package (#9285)
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Marcel Mraz 2025-03-26 15:24:59 +01:00 • committed by GitHub
parent a18f059188
commit 432a46ef9e
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372 changed files with 3466 additions and 2466 deletions
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28
packages/math/triangle.ts
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@ -1,28 +0,0 @@
import type { GlobalPoint, LocalPoint, Triangle } from "./types";
// Types
/**
* Tests if a point lies inside a triangle. This function
* will return FALSE if the point lies exactly on the sides
* of the triangle.
*
* @param triangle The triangle to test the point for
* @param p The point to test whether is in the triangle
* @returns TRUE if the point is inside of the triangle
*/
export function triangleIncludesPoint<P extends GlobalPoint | LocalPoint>(
[a, b, c]: Triangle<P>,
p: P,
): boolean {
const triangleSign = (p1: P, p2: P, p3: P) =>
(p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1]);
const d1 = triangleSign(p, a, b);
const d2 = triangleSign(p, b, c);
const d3 = triangleSign(p, c, a);
const has_neg = d1 < 0 || d2 < 0 || d3 < 0;
const has_pos = d1 > 0 || d2 > 0 || d3 > 0;
return !(has_neg && has_pos);
}