Camera.js

/**
 * Camera class keeps track of the current 
 * drawing position
 */


define(['./jo','./Point'], 
        function(jo, 
        		Point){

	jo.Camera = Point.extend({
		init: function(){
			this._super(0,0);
		},
		toScreen: function(p){
			if(typeof p =='undefined'){
				return this.neg();
			}
			return (p.minus(this)).floor();
		},
		toWorld: function(p){
			if(typeof p =='undefined'){
				return this;
			}
			return (p.plus(this)).floor();
		},

		toMap: function(p, tilesize){
			if(typeof p === 'undefined'){
				return null;
			}
			if(! tilesize){
				tilesize = 64;
			}
			var tw = th = tilesize;
			p = this.toWorld(p);
			p.x/=tw;
			p.y/=th;
			return p.floor();
		},
		parrallax: function(val, width, height){
			var para = this.mul(val);
			para.x = para.x % width;
			para.y = para.y % height;
			return para.negate();
		},
		snap: function(amount){
			
		}
	});
	return jo.Camera;
});