/**
 * Flade - Flash Dynamics Engine
 * Release 0.4 alpha 
 * Vector class
 * Copyright 2004, 2005 Alec Cove
 * 
 * This file is part of Flade. The Flash Dynamics Engine. 
 *	
 * Flade is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Flade is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Flade; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Flash is a registered trademark of Macromedia
 */

Vector = function(x,y) {
	this.x = x;
	this.y = y;
}

Vector.prototype.dot = function(v) {
	return this.x * v.x + this.y * v.y;
}

Vector.prototype.cross = function(v) {
	return this.x * v.y - this.y * v.x;
}

Vector.prototype.plus = function(v) {
	this.x += v.x;
	this.y += v.y;
	return this;
}

Vector.prototype.plusNew = function(v) {
	return new Vector(this.x + v.x, this.y + v.y); 
}

Vector.prototype.minus = function(v) {
 	this.x -= v.x;
	this.y -= v.y;
	return this;
}

Vector.prototype.minusNew = function(v) {
 	return new Vector(this.x - v.x, this.y - v.y);    
}

Vector.prototype.mult = function(s) {
	this.x *= s;
	this.y *= s;
	return this;
}

Vector.prototype.multNew = function(s) {
	return new Vector (this.x * s, this.y * s);
}

Vector.prototype.distance = function(p) {
    var dx = this.x - p.x;
    var dy = this.y - p.y;
    return Math.sqrt(dx * dx + dy * dy);
}

Vector.prototype.normalize = function() {
   var mag = Math.sqrt(this.x * this.x + this.y * this.y);
   this.x /= mag;
   this.y /= mag;
   return this;
}