Vector JS

by Sam Fereday

JavaScript

var vector = {

	_x: 1,
  _y: 0,

	//
  create: function(x, y) {
  		var obj = Object.create(this);
      obj.setX(x);
      obj.setY(y);
      return obj;
  },

  // Starts of as a unit vector, this is a vector with a length of 1.
  setX: function(n){
  	this._x = n;
  },
  setY: function(n){
  	this._y = n;
  },
  
  //
  getX: function(){
  	return this._x;
  },
  getY: function(){
  	return this._y;
  },
  getAll: function(){
  	return this._x + " : " + this._y;
  },
  
  //
  setAngle: function(angle){
  		var length = this.getLength();
      this._x = Math.cos(angle) * length;
      this._y = Math.sin(angle) * length;
  },
  getAngle: function(){
  		return Math.atan2(this._y, this._x);
  },
  setLength: function(length) {
  		var angle = this.getAngle();
    	this._x = Math.cos(angle) * length;
    	this._y = Math.sin(angle) * length;
  },
  getLength: function(){
  	return Math.sqrt(this._x * this._x + this._y * this._y);
  },
  
  //
  add: function(v2) {
  	return vector.create(this._x + v2.getX(), this._y + v2.getY());
  },
  subtract: function(v2) {
  	return vector.create(this._x - v2.getX(), this._y - v2.getY());
  },
  multiply: function(val){
  	return vector.create(this._x * val, this._y * val);
  },
  divide: function(val){
  	return vector.create(this._x / val, this._y / val);
  },
  
  //
  addTo: function(v2) {
  	this._x += v2.getX();
    this._y += v2.getY();
  },
  subtractTo: function(v2) {
  	this._x -= v2.getX();
    this._y -= v2.getY();
  },
  multiplyTo: function(val) {
  	this._x *= val;
    this._y *= val;
  },
  divideTo: function(val) {
  	this._x /= val;
    this._y /= val;
  }
  
}

// Do some stuff with it.
var v1 = vector.create(10, 5);
var v2 = vector.create(3, 4);
var v3 = v1.multiply();

console.log(v3.getAll());