function Point(e, offset) {
	if (typeof e == "number" && typeof offset == "number") {
		this.x = e;
		this.y = offset;
	}
	else if (! e) {
		this.x = 0;
		this.y = 0;
	}
	else if ('x' in e && 'y' in e) {
		this.x = e.x;
		this.y = e.y;
	}
	else if ('pageX' in e && 'pageX' in e) {
		this.x = e.pageX;
		this.y = e.pageY;
	}
	if (typeof offset == "object") {
		this.subtract({
			x: offset.left,
			y: offset.top
		});
	}
}
Point.prototype.add = function(p) {
	this.x += p.x;
	this.y += p.y;
	return this;
}
Point.prototype.subtract = function(p) {
	this.x -= p.x;
	this.y -= p.y;
	return this;
}
Point.prototype.quantize = function(x, y) {
	this.x = Math.floor( this.x / x ) * x;
	this.y = Math.floor( this.y / y ) * y;
	return this;
}
Point.prototype.scale = function(x, y) {
	this.x *= x;
	this.y *= y;
	return this;
}
Point.prototype.floor = function(){
	this.x = Math.floor(this.x);
	this.y = Math.floor(this.y);
	return this;
}
Point.prototype.ceil = function(){
	this.x = Math.ceil(this.x);
	this.y = Math.ceil(this.y);
	return this;
}
Point.prototype.round = function(){
	this.x = Math.round(this.x);
	this.y = Math.round(this.y);
	return this;
}