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Equidistant binding highlight for diamonds

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Signed-off-by: Mark Tolmacs <mark@lazycat.hu>
This commit is contained in:
Mark Tolmacs 2025-04-24 19:42:18 +02:00
parent e6b808e86f
commit 4d61040184
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4 changed files with 189 additions and 107 deletions
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47
packages/element/src/bounds.ts
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@ -14,6 +14,13 @@ import {
pointDistance,
pointFromArray,
pointRotateRads,
bezierEquation,
curve,
curveTangent,
vectorNormalize,
vectorNormal,
vectorScale,
pointFromVector,
} from "@excalidraw/math";
import { getCurvePathOps } from "@excalidraw/utils/shape";
@ -476,11 +483,7 @@ export const getRectangleBoxAbsoluteCoords = (boxSceneCoords: RectangleBox) => {
];
};
export const getDiamondPoints = (
element: ExcalidrawElement,
wPadding: number = 0,
hPadding: number = 0,
) => {
export const getDiamondPoints = (element: ExcalidrawElement) => {
// Here we add +1 to avoid these numbers to be 0
// otherwise rough.js will throw an error complaining about it
const topX = Math.floor(element.width / 2) + 1;
@ -492,16 +495,7 @@ export const getDiamondPoints = (
const leftX = 0;
const leftY = rightY;
return [
topX,
topY - hPadding,
rightX + wPadding,
rightY,
bottomX,
bottomY + hPadding,
leftX - wPadding,
leftY,
];
return [topX, topY, rightX, rightY, bottomX, bottomY, leftX, leftY];
};
// reference: https://eliot-jones.com/2019/12/cubic-bezier-curve-bounding-boxes
@ -1159,3 +1153,26 @@ export const doBoundsIntersect = (
return minX1 < maxX2 && maxX1 > minX2 && minY1 < maxY2 && maxY1 > minY2;
};
export function offsetBezier(
p0: GlobalPoint,
p1: GlobalPoint,
p2: GlobalPoint,
p3: GlobalPoint,
offsetDist: number,
steps = 20,
) {
const offsetPoints = [];
for (let i = 0; i <= steps; i++) {
const t = i / steps;
const c = curve(p0, p1, p2, p3);
const point = bezierEquation(c, t);
const tangent = vectorNormalize(curveTangent(c, t));
const normal = vectorNormal(tangent);
offsetPoints.push(pointFromVector(vectorScale(normal, offsetDist), point));
}
return offsetPoints;
}