یه لرزاننده فرم - shake Form

procedure WindowShake(wHandle: THandle) ;
const   MAXDELTA = 4;
        SHAKETIMES = 500;
   var
     oRect, wRect :TRect;
     deltax : integer;
     deltay : integer;
     cnt : integer;
     dx, dy : integer;
   begin
 
GetWindowRect(wHandle,wRect) ;
oRect := wRect;
Randomize;
   for cnt := 0 to SHAKETIMES do
     begin     deltax := Round(Random(MAXDELTA)) ;
    deltay := Round(Random(MAXDELTA)) ;
    dx := Round(1 + Random(2)) ;
     if dx = 2 then dx := -1;
     dy := Round(1 + Random(2)) ;
      if dy = 2 then dy := -1;
       OffsetRect(wRect,dx * deltax, dy * deltay) ;
MoveWindow(wHandle, wRect.Left,wRect.Top,wRect.Right - wRect.Left,wRect.Bottom - wRect.Top,true) ;
      end;

MoveWindow(wHandle, oRect.Left,oRect.Top,oRect.Right - oRect.Left,oRect.Bottom - oRect.Top,true) ;
end;