dabbjs/dist/lib/vec2d.js

general javascript library

//inspired by
//https://evanw.github.io/lightgl.js/docs/vector.html
export class Vector2D {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }
    /**
     * returns the length of the vector
     */
    length() { return Math.sqrt(this.dot(this)); }
    /**
     * returns DOT product of these vectors
     * @param v vector 2d
     */
    dot(v) { return this.x * v.x + this.y * v.y; }
    /**
     * returns the Determinant of these vectors
     * @param v vector 2d
     */
    det(v) { return this.x * v.y - this.y * v.x; }
    /**
     * returns the angle between these two vectors
     * @param v vector 2d
     */
    angleTo(v) { return Math.atan2(this.det(v), this.dot(v)); }
    /**
     * returns the vector addition
     * @param v vector2d or number
     */
    add(v) {
        if (typeof v === "number")
            return new Vector2D(this.x + v, this.y + v);
        else
            return new Vector2D(this.x + v.x, this.y + v.y);
    }
    /**
     * returns the vector subtraction
     * @param v vector2d or number
     */
    sub(v) {
        if (typeof v === "number")
            return new Vector2D(this.x - v, this.y - v);
        else
            return new Vector2D(this.x - v.x, this.y - v.y);
    }
    /**
     * returns the vector multiplication
     * @param v vector2d or number
     */
    mul(v) {
        if (typeof v === "number")
            return new Vector2D(this.x * v, this.y * v);
        else
            return new Vector2D(this.x * v.x, this.y * v.y);
    }
    /**
     * returns the vector division
     * @param v vector2d or number
     */
    div(v) {
        if (typeof v === "number")
            return new Vector2D(this.x / v, this.y / v);
        else
            return new Vector2D(this.x / v.x, this.y / v.y);
    }
    /**
     * returns the Unit vector
     */
    unit() { return this.div(this.length()); }
    /**
     * returns a clone of this vector
     */
    clone() { return new Vector2D(this.x, this.y); }
    /**
     * returns the XY plane origin/empty vector
     */
    static empty() { return new Vector2D(0, 0); }
}