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Precise rectanguloid when rounded

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Mark Tolmacs 2025-05-02 18:05:32 +02:00
parent 7275263686
commit 436a0568fa
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2 changed files with 212 additions and 165 deletions
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30
packages/element/src/bounds.ts
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@ -21,6 +21,7 @@ import {
vectorNormal,
vectorScale,
pointFromVector,
vector,
} from "@excalidraw/math";
import { getCurvePathOps } from "@excalidraw/utils/shape";
@ -1154,7 +1155,7 @@ export const doBoundsIntersect = (
return minX1 < maxX2 && maxX1 > minX2 && minY1 < maxY2 && maxY1 > minY2;
};
export function offsetBezier(
export function offsetCubicBezier(
p0: GlobalPoint,
p1: GlobalPoint,
p2: GlobalPoint,
@ -1176,3 +1177,30 @@ export function offsetBezier(
return offsetPoints;
}
export function offsetQuadraticBezier(
p0: GlobalPoint,
p1: GlobalPoint,
p2: GlobalPoint,
offsetDist: number,
steps = 20,
) {
const offsetPoints = [];
for (let i = 0; i <= steps; i++) {
const t = i / steps;
const t1 = 1 - t;
const point = pointFrom<GlobalPoint>(
t1 * t1 * p0[0] + 2 * t1 * t * p1[0] + t * t * p2[0],
t1 * t1 * p0[1] + 2 * t1 * t * p1[1] + t * t * p2[1],
);
const tangentX = 2 * (1 - t) * (p1[0] - p0[0]) + 2 * t * (p2[0] - p1[0]);
const tangentY = 2 * (1 - t) * (p1[1] - p0[1]) + 2 * t * (p2[1] - p1[1]);
const tangent = vectorNormalize(vector(tangentX, tangentY));
const normal = vectorNormal(tangent);
offsetPoints.push(pointFromVector(vectorScale(normal, offsetDist), point));
}
return offsetPoints;
}