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feat: Elbow arrow segment fixing & positioning (#8952)

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Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>
Co-authored-by: David Luzar <5153846+dwelle@users.noreply.github.com>
This commit is contained in:
Márk Tolmács 2025-01-17 18:07:03 +01:00 • committed by GitHub
parent 8551823da9
commit 91ebf8b0ea
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33 changed files with 3282 additions and 1716 deletions
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40
packages/math/line.ts
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@ -1,4 +1,4 @@
import { pointCenter, pointRotateRads } from "./point";
import { pointCenter, pointFrom, pointRotateRads } from "./point";
import type { GlobalPoint, Line, LocalPoint, Radians } from "./types";
/**
@ -38,8 +38,16 @@ export function lineFromPointArray<P extends GlobalPoint | LocalPoint>(
: undefined;
}
// return the coordinates resulting from rotating the given line about an origin by an angle in degrees
// note that when the origin is not given, the midpoint of the given line is used as the origin
/**
* Return the coordinates resulting from rotating the given line about an
* origin by an angle in degrees note that when the origin is not given,
* the midpoint of the given line is used as the origin
*
* @param l
* @param angle
* @param origin
* @returns
*/
export const lineRotate = <Point extends LocalPoint | GlobalPoint>(
l: Line<Point>,
angle: Radians,
@ -50,3 +58,29 @@ export const lineRotate = <Point extends LocalPoint | GlobalPoint>(
pointRotateRads(l[1], origin || pointCenter(l[0], l[1]), angle),
);
};
/**
* Determines the intersection point (unless the lines are parallel) of two
* lines
*
* @param a
* @param b
* @returns
*/
export const linesIntersectAt = <Point extends GlobalPoint | LocalPoint>(
a: Line<Point>,
b: Line<Point>,
): Point | null => {
const A1 = a[1][1] - a[0][1];
const B1 = a[0][0] - a[1][0];
const A2 = b[1][1] - b[0][1];
const B2 = b[0][0] - b[1][0];
const D = A1 * B2 - A2 * B1;
if (D !== 0) {
const C1 = A1 * a[0][0] + B1 * a[0][1];
const C2 = A2 * b[0][0] + B2 * b[0][1];
return pointFrom<Point>((C1 * B2 - C2 * B1) / D, (A1 * C2 - A2 * C1) / D);
}
return null;
};