Повернуть 2D точку

Оформил: DeeCo

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*)