If this works right, setting Angle (yeah, yeah) switches between an aura circle and a drawn circle. aura is scaled at size 100 being 100% - 200, 200% etc.
/* SDLMain.m - main entry point for our Cocoa-ized SDL app
Initial Version: Darrell Walisser <dwaliss1@purdue.edu>
Non-NIB-Code & other changes: Max Horn <max@quendi.de>
Feel free to customize this file to suit your needs
*/
#ifndef _SDLMain_h_
#define _SDLMain_h_
#import <Cocoa/Cocoa.h>
@interface SDLMain : NSObject
@end
#endif /* _SDLMain_h_ */