Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

const
 PIDiv180 = 0.017453292519943295769236907684886;

 procedure Rotate(RotAng: Double; x, y: Double; var Nx, Ny: Double);
 var
 SinVal: Double;
 CosVal: Double;
 begin
 RotAng := RotAng * PIDiv180;
 SinVal := Sin(RotAng);
 CosVal := Cos(RotAng);
 Nx := x * CosVal - y * SinVal;
 Ny := y * CosVal + x * SinVal;
 end;
 (* End Of Rotate Cartesian Point*)