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fix: lasso selection issues (#9353)

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* revert stroke slicing hack for knot

* fix incorrect closing of path

* nonzero enclosure

* lint
This commit is contained in:
Ryan Di
2025-04-08 00:50:52 +10:00
committed by GitHub
parent e48b63a0ae
commit 6fc85022ae
3 changed files with 35 additions and 15 deletions
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28
packages/math/src/polygon.ts
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@@ -41,6 +41,34 @@ export const polygonIncludesPoint = <Point extends LocalPoint | GlobalPoint>(
return inside;
};
export const polygonIncludesPointNonZero = <Point extends [number, number]>(
point: Point,
polygon: Point[],
): boolean => {
const [x, y] = point;
let windingNumber = 0;
for (let i = 0; i < polygon.length; i++) {
const j = (i + 1) % polygon.length;
const [xi, yi] = polygon[i];
const [xj, yj] = polygon[j];
if (yi <= y) {
if (yj > y) {
if ((xj - xi) * (y - yi) - (x - xi) * (yj - yi) > 0) {
windingNumber++;
}
}
} else if (yj <= y) {
if ((xj - xi) * (y - yi) - (x - xi) * (yj - yi) < 0) {
windingNumber--;
}
}
}
return windingNumber !== 0;
};
export const pointOnPolygon = <Point extends LocalPoint | GlobalPoint>(
p: Point,
poly: Polygon<Point>,