@fimbul-works/vec
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A comprehensive TypeScript vector math library providing 2D, 3D, and 4D vector operations with a focus on performance and type safety.
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JavaScript
import { dot4D } from "./dot-4d.js";
import { magnitude4D } from "./magnitude-4d.js";
/**
* Projects one 4D vector onto another.
* @param {ArrayVector4D} xyzw1 - First vector as `[x, y, z, w]`
* @param {ArrayVector4D} xyzw2 - Second vector as `[x, y, z, w]` to project onto
* @param {number} [m1] - Optional current magnitude (default: `magnitude4D(xyzw1)`)
* @param {number} [m2] - Optional current magnitude (default: `magnitude4D(xyzw2)`)
* @returns {ArrayVector4D} The projected vector
*/
export const project4D = (xyzw1, xyzw2, m1 = magnitude4D(xyzw1), m2 = magnitude4D(xyzw2)) => {
const f = m1 * Math.cos(Math.acos(dot4D(xyzw1, xyzw2) / (m1 * m2)));
return [(xyzw2[0] / m2) * f, (xyzw2[1] / m2) * f, (xyzw2[2] / m2) * f, (xyzw2[3] / m2) * f];
};