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Attempt at optimizing focus point calc

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Mark Tolmacs 2024-09-27 20:27:10 +02:00
parent 5cbd6e63a0
commit 34ec751501
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3 changed files with 63 additions and 24 deletions
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14
packages/math/point.ts
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@ -46,8 +46,11 @@ export function pointFromPair<Point extends GenericPoint>(
* @param v The vector to convert
* @returns The point the vector points at with origin 0,0
*/
export function pointFromVector<P extends GenericPoint>(v: Vector): P {
return v as unknown as P;
export function pointFromVector<P extends GenericPoint>(
v: Vector,
offset: P = point(0, 0),
): P {
return point<P>(offset[0] + v[0], offset[1] + v[1]);
}
/**
@ -96,9 +99,12 @@ export function pointRotateRads<Point extends GenericPoint>(
[cx, cy]: Point,
angle: Radians,
): Point {
const cos = Math.cos(angle);
const sin = Math.sin(angle);
return point(
(x - cx) * Math.cos(angle) - (y - cy) * Math.sin(angle) + cx,
(x - cx) * Math.sin(angle) + (y - cy) * Math.cos(angle) + cy,
(x - cx) * cos - (y - cy) * sin + cx,
(x - cx) * sin + (y - cy) * cos + cy,
);
}

15
packages/math/vector.ts
View file

@ -1,4 +1,4 @@
import type { GenericPoint, Vector } from "./types";
import type { GenericPoint, Radians, Vector } from "./types";
/**
* Create a vector from the x and y coordiante elements.
@ -139,3 +139,16 @@ export const vectorNormalize = (v: Vector): Vector => {
return vector(v[0] / m, v[1] / m);
};
/**
* Rotate a vector by the given radians
* @param v Target vector
* @param a Angle to rotate in radians
* @returns The rotated vector
*/
export const vectorRotate = (v: Vector, a: Radians): Vector => {
const cos = Math.cos(a);
const sin = Math.sin(a);
return vector(v[0] * cos - v[1] * sin, v[0] * sin + v[1] * cos);
};