*
* @param {number} x
* @param {number} y
* @param {number} width
* @param {number} height
*/
this.addDirtyRect = function(x, y, width, height) {
// Calculate out the rectangle edges
var left = x;
var right = x + width;
var top = y;
var bottom = y + height;
// Min of left and entity left
this.left = left < this.left left : this.left;
// Max of right and entity right
this.right = right > this.right right : this.right;
// Min of top and entity top
this.top = top < this.top top : this.top;
// Max of bottom and entity bottom
this.bottom = bottom > this.bottom bottom : this.bottom;
this.isDirty = true;
};
/**
* Clears the rectangle area if the manager is dirty
*
* @param {CanvasRenderingContext2D} context
*/
this.clearRect = function(context) {
