Switching between cache states

EaselJS cache switching

Circle.prototype._collidingCacheCanvas = null;
Circle.prototype._normalCacheCanvas = null;
Circle.prototype._draw = function()
{
	if(this.isColliding)
	{
		if(this._collidingCacheCanvas)
		{
			this.cacheCanvas = this._collidingCacheCanvas;
			return;
		}
	}
	else
	{
		if(this._normalCacheCanvas)
		{
			this.cacheCanvas = this._normalCacheCanvas;
			return;
		}
	}
	
	var g = this.graphics;
	
	g.clear();
	g.setStrokeStyle(1);
	g.beginStroke("#000000");
	
	if(this.isColliding)
	{
		g.beginFill("FF0000");
	}
	else
	{
		g.beginFill("FFFFFF");
	}
	
	g.drawCircle(this.radius, this.radius, this.radius);
	this.uncache();
	this.cache(-1,-1, this.width + 2, this.height + 2);

	if(this.isColliding)
	{
		this._collidingCacheCanvas = this.cacheCanvas;
	}
	else
	{
		this._normalCacheCanvas = this.cacheCanvas;
	}
}