Creates a circular game object.
		
		
			Example
			
				cfg.Game;
				
				function OnLoad()
				{
				    circle = gfx.CreateCircle( 0.4, 0xff1133, 6, 0x7799ff );
				}
				
				function OnReady()
				{
				    gfx.AddGraphic( circle, 0.3, 0.2 );
				    gfx.Play();
				}
			
			
		 
		Methods
		The following methods are available on the Circle object:
		alpha → 
number: fraction (0..1) 
		angle → 
number: fraction (0..1) 
		
		
		
		
		height → 
number: fraction (0..1) 
		pivotX → 
number: fraction (0..1) 
		pivotY → 
number: fraction (0..1) 
		
		
		
		
		
		
	 
	string
	number: hexadecimal 0xrrggbb
	number: fraction (0..1)
	number: pixel
	
	The objects alpha value
	The rotation fraction of the object
	cir.Contains
Checks if a point is contained in the sprite
	An object for saving individual extra properties.
	
	The objects group identifier
	The height of the object
	The x pivot for rotations
	The y pivot for rotations
	The horizontal scaling
	The vertical scaling
	cir.SetMatrix
Set the individual 2d transformation
	cir.Update
Updates internal properties
	Indicates the objects visibility state
	The obects width