FilterTwirl unhandled exception

[BubikolRamios]

I guess it is not anticipated anything < 0 (results looks to me not opposite of positive numbers)

Project project1 raised exception class 'External: FLT INVALID OPERATION'.

Code: Pascal  [Select][+][-]

1.  function FilterTwirl(ABounds: TRect; ACenter: TPoint; ARadius: Single; ATurn: Single=1; AExponent: Single=3; ACopyProperties: Boolean=False): TBGRABitmap; overload; override;                        
2.  

                     

at AExponent = -17, going from 0,-1,-2, .... just fine. Positive numbers are as it seems all ok.