function Coord(x, y) {
	this.x = (!x)?0:x;
	this.y = (!y)?0:y;

	this.toString = objToString;
	this.equals = equalsCoord;
}

function objToString() {
	var ret = "{";
	for(p in this ) {
		if (typeof this[p] == "function" || typeof this[p] == "object") continue;
		if(ret.length > 1)
			ret += ",";
		ret += p + ":" + this[p];
	}
	return ret + "}";
}

function Canvas(x, y, width, height) {
	this.width = (!width)?0:width;
	this.height = (!height)?0:height;

	this.Coord = Coord;
	this.Coord(x, y);

	this.equalsCoord = this.equals;
	this.equals = equalsCanvas;
}

function equalsCoord(c) {
	return (this.x == c.x && this.y == c.y);
}
function equalsCanvas(c) {
	return ( this.equalsCoord == c.equalsCoord && this.width == c.width && this.height == c.height);
}