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import type {
LocalPoint,
GlobalPoint,
Triangle,
Vector,
Radians,
} from "@excalidraw/math";
import {
pointFrom,
pointRotateRads,
pointScaleFromOrigin,
radiansToDegrees,
triangleIncludesPoint,
vectorFromPoint,
} from "@excalidraw/math";
import { getCenterForBounds, type Bounds } from "./bounds";
import type { ExcalidrawBindableElement } from "./types";
export const HEADING_RIGHT = [1, 0] as Heading;
export const HEADING_DOWN = [0, 1] as Heading;
export const HEADING_LEFT = [-1, 0] as Heading;
export const HEADING_UP = [0, -1] as Heading;
export type Heading = [1, 0] | [0, 1] | [-1, 0] | [0, -1];
export const headingForDiamond = <Point extends GlobalPoint | LocalPoint>(
a: Point,
b: Point,
) => {
const angle = radiansToDegrees(
Math.atan2(b[1] - a[1], b[0] - a[0]) as Radians,
);
if (angle >= 315 || angle < 45) {
return HEADING_UP;
} else if (angle >= 45 && angle < 135) {
return HEADING_RIGHT;
} else if (angle >= 135 && angle < 225) {
return HEADING_DOWN;
}
return HEADING_LEFT;
};
export const vectorToHeading = (vec: Vector): Heading => {
const [x, y] = vec;
const absX = Math.abs(x);
const absY = Math.abs(y);
if (x > absY) {
return HEADING_RIGHT;
} else if (x <= -absY) {
return HEADING_LEFT;
} else if (y > absX) {
return HEADING_DOWN;
}
return HEADING_UP;
};
export const headingForPoint = <P extends GlobalPoint | LocalPoint>(
p: P,
o: P,
) => vectorToHeading(vectorFromPoint<P>(p, o));
export const headingForPointIsHorizontal = <P extends GlobalPoint | LocalPoint>(
p: P,
o: P,
) => headingIsHorizontal(headingForPoint<P>(p, o));
export const compareHeading = (a: Heading, b: Heading) =>
a[0] === b[0] && a[1] === b[1];
export const headingIsHorizontal = (a: Heading) =>
compareHeading(a, HEADING_RIGHT) || compareHeading(a, HEADING_LEFT);
export const headingIsVertical = (a: Heading) => !headingIsHorizontal(a);
// Gets the heading for the point by creating a bounding box around the rotated
// close fitting bounding box, then creating 4 search cones around the center of
// the external bbox.
export const headingForPointFromElement = <
Point extends GlobalPoint | LocalPoint,
>(
element: Readonly<ExcalidrawBindableElement>,
aabb: Readonly<Bounds>,
p: Readonly<Point>,
): Heading => {
const SEARCH_CONE_MULTIPLIER = 2;
const midPoint = getCenterForBounds(aabb);
if (element.type === "diamond") {
if (p[0] < element.x) {
return HEADING_LEFT;
} else if (p[1] < element.y) {
return HEADING_UP;
} else if (p[0] > element.x + element.width) {
return HEADING_RIGHT;
} else if (p[1] > element.y + element.height) {
return HEADING_DOWN;
}
const top = pointRotateRads(
pointScaleFromOrigin(
pointFrom(element.x + element.width / 2, element.y),
midPoint,
SEARCH_CONE_MULTIPLIER,
),
midPoint,
element.angle,
);
const right = pointRotateRads(
pointScaleFromOrigin(
pointFrom(element.x + element.width, element.y + element.height / 2),
midPoint,
SEARCH_CONE_MULTIPLIER,
),
midPoint,
element.angle,
);
const bottom = pointRotateRads(
pointScaleFromOrigin(
pointFrom(element.x + element.width / 2, element.y + element.height),
midPoint,
SEARCH_CONE_MULTIPLIER,
),
midPoint,
element.angle,
);
const left = pointRotateRads(
pointScaleFromOrigin(
pointFrom(element.x, element.y + element.height / 2),
midPoint,
SEARCH_CONE_MULTIPLIER,
),
midPoint,
element.angle,
);
if (
triangleIncludesPoint<Point>([top, right, midPoint] as Triangle<Point>, p)
) {
return headingForDiamond(top, right);
} else if (
triangleIncludesPoint<Point>(
[right, bottom, midPoint] as Triangle<Point>,
p,
)
) {
return headingForDiamond(right, bottom);
} else if (
triangleIncludesPoint<Point>(
[bottom, left, midPoint] as Triangle<Point>,
p,
)
) {
return headingForDiamond(bottom, left);
}
return headingForDiamond(left, top);
}
const topLeft = pointScaleFromOrigin(
pointFrom(aabb[0], aabb[1]),
midPoint,
SEARCH_CONE_MULTIPLIER,
) as Point;
const topRight = pointScaleFromOrigin(
pointFrom(aabb[2], aabb[1]),
midPoint,
SEARCH_CONE_MULTIPLIER,
) as Point;
const bottomLeft = pointScaleFromOrigin(
pointFrom(aabb[0], aabb[3]),
midPoint,
SEARCH_CONE_MULTIPLIER,
) as Point;
const bottomRight = pointScaleFromOrigin(
pointFrom(aabb[2], aabb[3]),
midPoint,
SEARCH_CONE_MULTIPLIER,
) as Point;
return triangleIncludesPoint<Point>(
[topLeft, topRight, midPoint] as Triangle<Point>,
p,
)
? HEADING_UP
: triangleIncludesPoint<Point>(
[topRight, bottomRight, midPoint] as Triangle<Point>,
p,
)
? HEADING_RIGHT
: triangleIncludesPoint<Point>(
[bottomRight, bottomLeft, midPoint] as Triangle<Point>,
p,
)
? HEADING_DOWN
: HEADING_LEFT;
};
export const flipHeading = (h: Heading): Heading =>
[
h[0] === 0 ? 0 : h[0] > 0 ? -1 : 1,
h[1] === 0 ? 0 : h[1] > 0 ? -1 : 1,
] as Heading;
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