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This commit is contained in:
Jan Prochazka
2022-01-06 12:10:17 +01:00
parent 75e93ec11e
commit b8ac4a5a06
3 changed files with 34 additions and 23 deletions
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37
packages/web/src/designer/designerMath.ts
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@@ -12,15 +12,15 @@ interface IBoxBounds {
// helpers for figuring out where to draw arrows
export function intersectLineLine(p1: IPoint, p2: IPoint, p3: IPoint, p4: IPoint): IPoint {
var denom = (p4.y - p3.y) * (p2.x - p1.x) - (p4.x - p3.x) * (p2.y - p1.y);
const denom = (p4.y - p3.y) * (p2.x - p1.x) - (p4.x - p3.x) * (p2.y - p1.y);
// lines are parallel
if (denom === 0) {
return null;
}
var ua = ((p4.x - p3.x) * (p1.y - p3.y) - (p4.y - p3.y) * (p1.x - p3.x)) / denom;
var ub = ((p2.x - p1.x) * (p1.y - p3.y) - (p2.y - p1.y) * (p1.x - p3.x)) / denom;
const ua = ((p4.x - p3.x) * (p1.y - p3.y) - (p4.y - p3.y) * (p1.x - p3.x)) / denom;
const ub = ((p2.x - p1.x) * (p1.y - p3.y) - (p2.y - p1.y) * (p1.x - p3.x)) / denom;
if (ua < 0 || ua > 1 || ub < 0 || ub > 1) {
return null;
@@ -32,25 +32,26 @@ export function intersectLineLine(p1: IPoint, p2: IPoint, p3: IPoint, p4: IPoint
};
}
export function intersectLineBox(p1: IPoint, p2: IPoint, box: IBoxBounds): IPoint {
var tl = { x: box.left, y: box.top };
var tr = { x: box.right, y: box.top };
var bl = { x: box.left, y: box.bottom };
var br = { x: box.right, y: box.bottom };
export function intersectLineBox(p1: IPoint, p2: IPoint, box: IBoxBounds): IPoint[] {
const tl = { x: box.left, y: box.top };
const tr = { x: box.right, y: box.top };
const bl = { x: box.left, y: box.bottom };
const br = { x: box.right, y: box.bottom };
var result;
if ((result = intersectLineLine(p1, p2, tl, tr))) {
return result;
const res = [];
let item;
if ((item = intersectLineLine(p1, p2, tl, tr))) {
res.push(item);
} // top
if ((result = intersectLineLine(p1, p2, tr, br))) {
return result;
if ((item = intersectLineLine(p1, p2, tr, br))) {
res.push(item);
} // right
if ((result = intersectLineLine(p1, p2, br, bl))) {
return result;
if ((item = intersectLineLine(p1, p2, br, bl))) {
res.push(item);
} // bottom
if ((result = intersectLineLine(p1, p2, bl, tl))) {
return result;
if ((item = intersectLineLine(p1, p2, bl, tl))) {
res.push(item);
} // left
return null;
return res;
}