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fix: Reimplement rectangle intersection (#8367)

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pull/8368/head
Márk Tolmács 6 months ago committed by GitHub
parent 5daf1a1b4e
commit 8420e1aa13
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GPG Key ID: B5690EEEBB952194
4 changed files with 131 additions and 74 deletions
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55
packages/excalidraw/element/binding.ts
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@ -72,6 +72,7 @@ import {
vectorToHeading,
type Heading,
} from "./heading";
import { segmentIntersectRectangleElement } from "../../utils/geometry/geometry";
export type SuggestedBinding =
| NonDeleted<ExcalidrawBindableElement>
@ -753,6 +754,7 @@ export const bindPointToSnapToElementOutline = (
if (bindableElement && aabb) {
// TODO: Dirty hacks until tangents are properly calculated
const heading = headingForPointFromElement(bindableElement, aabb, point);
const intersections = [
...intersectElementWithLine(
bindableElement,
@ -760,61 +762,22 @@ export const bindPointToSnapToElementOutline = (
[point[0], point[1] + 2 * bindableElement.height],
FIXED_BINDING_DISTANCE,
elementsMap,
).map((i) => {
if (!isRectangularElement(bindableElement)) {
return i;
}
const d = distanceToBindableElement(
{
...bindableElement,
x: Math.round(bindableElement.x),
y: Math.round(bindableElement.y),
width: Math.round(bindableElement.width),
height: Math.round(bindableElement.height),
},
[Math.round(i[0]), Math.round(i[1])],
new Map(),
);
return d >= bindableElement.height / 2 || d < FIXED_BINDING_DISTANCE
? ([point[0], -1 * i[1]] as Point)
: ([point[0], i[1]] as Point);
}),
),
...intersectElementWithLine(
bindableElement,
[point[0] - 2 * bindableElement.width, point[1]],
[point[0] + 2 * bindableElement.width, point[1]],
FIXED_BINDING_DISTANCE,
elementsMap,
).map((i) => {
if (!isRectangularElement(bindableElement)) {
return i;
}
const d = distanceToBindableElement(
{
...bindableElement,
x: Math.round(bindableElement.x),
y: Math.round(bindableElement.y),
width: Math.round(bindableElement.width),
height: Math.round(bindableElement.height),
},
[Math.round(i[0]), Math.round(i[1])],
new Map(),
);
return d >= bindableElement.width / 2 || d < FIXED_BINDING_DISTANCE
? ([-1 * i[0], point[1]] as Point)
: ([i[0], point[1]] as Point);
}),
),
];
const heading = headingForPointFromElement(bindableElement, aabb, point);
const isVertical =
compareHeading(heading, HEADING_LEFT) ||
compareHeading(heading, HEADING_RIGHT);
const dist = distanceToBindableElement(bindableElement, point, elementsMap);
const dist = Math.abs(
distanceToBindableElement(bindableElement, point, elementsMap),
);
const isInner = isVertical
? dist < bindableElement.width * -0.1
: dist < bindableElement.height * -0.1;
@ -1641,6 +1604,10 @@ const intersectElementWithLine = (
gap: number = 0,
elementsMap: ElementsMap,
): Point[] => {
if (isRectangularElement(element)) {
return segmentIntersectRectangleElement(element, [a, b], gap);
}
const relateToCenter = relativizationToElementCenter(element, elementsMap);
const aRel = GATransform.apply(relateToCenter, GAPoint.from(a));
const bRel = GATransform.apply(relateToCenter, GAPoint.from(b));

54
packages/excalidraw/tests/__snapshots__/history.test.tsx.snap
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@ -191,7 +191,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
"fillStyle": "solid",
"frameId": null,
"groupIds": [],
"height": "99.19726",
"height": 99,
"id": "id166",
"index": "a2",
"isDeleted": false,
@ -205,8 +205,8 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
0,
],
[
"98.40368",
"99.19726",
"98.20800",
99,
],
],
"roughness": 1,
@ -221,7 +221,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
"type": "arrow",
"updated": 1,
"version": 40,
"width": "98.40368",
"width": "98.20800",
"x": 1,
"y": 0,
}
@ -387,15 +387,15 @@ History {
"focus": 0,
"gap": 1,
},
"height": "99.19726",
"height": 99,
"points": [
[
0,
0,
],
[
"98.40368",
"99.19726",
"98.20800",
99,
],
],
"startBinding": null,
@ -813,7 +813,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
"updated": 1,
"version": 30,
"width": 0,
"x": 251,
"x": 200,
"y": 0,
}
`;
@ -1242,7 +1242,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
0,
],
[
98,
"98.00000",
"-2.61991",
],
],
@ -1266,8 +1266,8 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
"type": "arrow",
"updated": 1,
"version": 11,
"width": 98,
"x": 1,
"width": "98.00000",
"x": "1.00000",
"y": "3.98333",
}
`;
@ -1607,7 +1607,7 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
0,
],
[
98,
"98.00000",
"-2.61991",
],
],
@ -1631,8 +1631,8 @@ exports[`history > multiplayer undo/redo > conflicts in arrows and their bindabl
"type": "arrow",
"updated": 1,
"version": 11,
"width": 98,
"x": 1,
"width": "98.00000",
"x": "1.00000",
"y": "3.98333",
}
`;
@ -1764,7 +1764,7 @@ History {
0,
],
[
98,
"98.00000",
"-22.36242",
],
],
@ -1786,9 +1786,9 @@ History {
"strokeStyle": "solid",
"strokeWidth": 2,
"type": "arrow",
"width": 98,
"width": "98.00000",
"x": 1,
"y": "34.00000",
"y": 34,
},
"inserted": {
"isDeleted": true,
@ -14847,7 +14847,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
0,
],
[
98,
"98.00000",
0,
],
],
@ -14868,7 +14868,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
"type": "arrow",
"updated": 1,
"version": 10,
"width": 98,
"width": "98.00000",
"x": 1,
"y": 0,
}
@ -15540,7 +15540,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
0,
],
[
98,
"98.00000",
0,
],
],
@ -15561,7 +15561,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
"type": "arrow",
"updated": 1,
"version": 10,
"width": 98,
"width": "98.00000",
"x": 1,
"y": 0,
}
@ -16157,7 +16157,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
0,
],
[
98,
"98.00000",
0,
],
],
@ -16178,7 +16178,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
"type": "arrow",
"updated": 1,
"version": 10,
"width": 98,
"width": "98.00000",
"x": 1,
"y": 0,
}
@ -16772,7 +16772,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
0,
],
[
98,
"98.00000",
0,
],
],
@ -16793,7 +16793,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
"type": "arrow",
"updated": 1,
"version": 10,
"width": 98,
"width": "98.00000",
"x": 1,
"y": 0,
}
@ -17484,7 +17484,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
0,
],
[
98,
"98.00000",
0,
],
],
@ -17505,7 +17505,7 @@ exports[`history > singleplayer undo/redo > should support bidirectional binding
"type": "arrow",
"updated": 1,
"version": 11,
"width": 98,
"width": "98.00000",
"x": 1,
"y": 0,
}

4
packages/excalidraw/tests/rotate.test.tsx
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@ -77,6 +77,6 @@ test("unselected bound arrows update when rotating their target elements", async
expect(textArrow.x).toEqual(360);
expect(textArrow.y).toEqual(300);
expect(textArrow.points[0]).toEqual([0, 0]);
expect(textArrow.points[1][0]).toBeCloseTo(-94, 1);
expect(textArrow.points[1][1]).toBeCloseTo(-116.1, 1);
expect(textArrow.points[1][0]).toBeCloseTo(-94, 0);
expect(textArrow.points[1][1]).toBeCloseTo(-116.1, 0);
});

92
packages/utils/geometry/geometry.ts
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@ -1,4 +1,13 @@
import { distance2d } from "../../excalidraw/math";
import type { ExcalidrawBindableElement } from "../../excalidraw/element/types";
import {
addVectors,
distance2d,
rotatePoint,
scaleVector,
subtractVectors,
} from "../../excalidraw/math";
import type { LineSegment } from "../bbox";
import { crossProduct } from "../bbox";
import type {
Point,
Line,
@ -968,3 +977,84 @@ export const pointInEllipse = (point: Point, ellipse: Ellipse) => {
1
);
};
/**
* Calculates the point two line segments with a definite start and end point
* intersect at.
*/
export const segmentsIntersectAt = (
a: Readonly<LineSegment>,
b: Readonly<LineSegment>,
): Point | null => {
const r = subtractVectors(a[1], a[0]);
const s = subtractVectors(b[1], b[0]);
const denominator = crossProduct(r, s);
if (denominator === 0) {
return null;
}
const i = subtractVectors(b[0], a[0]);
const u = crossProduct(i, r) / denominator;
const t = crossProduct(i, s) / denominator;
if (u === 0) {
return null;
}
const p = addVectors(a[0], scaleVector(r, t));
if (t >= 0 && t < 1 && u >= 0 && u < 1) {
return p;
}
return null;
};
/**
* Determine intersection of a rectangular shaped element and a
* line segment.
*
* @param element The rectangular element to test against
* @param segment The segment intersecting the element
* @param gap Optional value to inflate the shape before testing
* @returns An array of intersections
*/
// TODO: Replace with final rounded rectangle code
export const segmentIntersectRectangleElement = (
element: ExcalidrawBindableElement,
segment: LineSegment,
gap: number = 0,
): Point[] => {
const bounds = [
element.x - gap,
element.y - gap,
element.x + element.width + gap,
element.y + element.height + gap,
];
const center = [
(bounds[0] + bounds[2]) / 2,
(bounds[1] + bounds[3]) / 2,
] as Point;
return [
[
rotatePoint([bounds[0], bounds[1]], center, element.angle),
rotatePoint([bounds[2], bounds[1]], center, element.angle),
] as LineSegment,
[
rotatePoint([bounds[2], bounds[1]], center, element.angle),
rotatePoint([bounds[2], bounds[3]], center, element.angle),
] as LineSegment,
[
rotatePoint([bounds[2], bounds[3]], center, element.angle),
rotatePoint([bounds[0], bounds[3]], center, element.angle),
] as LineSegment,
[
rotatePoint([bounds[0], bounds[3]], center, element.angle),
rotatePoint([bounds[0], bounds[1]], center, element.angle),
] as LineSegment,
]
.map((s) => segmentsIntersectAt(segment, s))
.filter((i): i is Point => !!i);
};

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