NSPoint pointD = NSMakePoint( (ch / 2) , ch );
NSPoint lCtr = NSMakePoint( (ch / 2) , (ch / 2) );
NSPoint rCtr = NSMakePoint( (cw - (ch / 2)) , (ch / 2) );
NSPoint pointD = NSMakePoint( (ch / 2) , ch );
NSPoint lCtr = NSMakePoint( (ch / 2) , (ch / 2) );
NSPoint rCtr = NSMakePoint( (cw - (ch / 2)) , (ch / 2) );