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

procedure TForm1.Button1Click(Sender: TObject);
 var
   pusat: array of TPoint;
   i: Integer;
 begin
   SetLength(pusat, 4);
   for i := Low(pusat) to High(pusat) do
   begin
     pusat[i].x := Random(Width);
     pusat[i].y := Random(Height);
   end;
   Canvas.PolyBezier(pusat);
 end;