NewCircle x:Int, y:Int, radius:Int, [color:Int, tag:Int, expire:Int]
Create new circle drawing. The circle will be centered at x,y, and have the specified radius.
The color is an integer between 0 and 30, and selects the color. The tag is a value between 0 and 32767 you can use to identify your drawings, usually this value is created using Atom.
expire defines the time-of-expiry for the game as a turn number: if the current turn number is larger than this value, the drawing is automatically deleted. Thus, set expire=0 to make drawings only visible for the current session. expire=-1 is the default, drawings with this value never expire.
Since: PCC 1.0.5, PCC2 1.99.9
See also: NewLine, NewRectangle, NewMarker
