Vector 2D

Vector.js

class Vector {
  constructor(x, y) {
    this.x = x || 0;
    this.y = y || 0;
  }

  toString = () => `(${this.x}, ${this.y})`;

  _limitApply = () => {
    if (this.limitValue && this.mag() > this.limitValue)
      this.setMag(this.limitValue);
  };

  add = v => {
    this.x += v.x;
    this.y += v.y;

    this._limitApply();
  };

  static add = (v1, v2) => new Vector(v1.x + v2.x, v1.y + v2.y);

  sub = v => {
    this.x -= v.x;
    this.y -= v.y;

    this._limitApply();
  };

  static sub = (v1, v2) => new Vector(v1.x - v2.x, v1.y - v2.y);

  div = v => {
    this.x /= value;
    this.y /= value;

    this._limitApply();
  };

  static div = (v, value) => new Vector(v.x / value, v.y / value);

  mult = value => {
    this.x *= value;
    this.y *= value;

    this._limitApply();
  };

  static mult = (v, value) => new Vector(v.x * value, v.y * value);

  mag = () => Math.sqrt(this.x * this.x + this.y * this.y);

  magSq = () => {
    let mag = this.mag();
    return mag * mag;
  };

  normalize = () => {
    let mag = this.mag();
    this.x /= mag;
    this.y /= mag;
  };

  setMag = value => {
    this.normalize();
    this.mult(value);
  };

  limit = value => {
    this.limitValue = value;

    this._limitApply();
  };

  clone = () => {
    let vector = new Vector(this.x, this.y);
    if (this.limit) vector.limit = this.limit;

    return vector;
  };
}