{Setwrtmd.PAS}
  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
 {Sample code for the SetWriteMode procedure.}

  uses Crt, Graph;

 var
   Driver, Mode, I: Integer;
   X1, Y1, Dx, Dy: Integer;
   FillInfo: FillSettingsType;
 begin
   DirectVideo := False;    { Turn off screen write }
   Randomize;
   Driver := Detect;     { Put in graphics mode }
   InitGraph(Driver, Mode, '');
   if GraphResult < 0 then
     Halt(1);
   { Fill screen with background pattern }
   GetFillSettings(FillInfo);    { Get current settings }
   SetFillStyle(WideDotFill, FillInfo.Color);
   Bar(0, 0, GetMaxX, GetMaxY);
   Dx := GetMaxX div 4;    { Determine rectangle's dimensions }
   Dy := GetMaxY div 4;
   SetLineStyle(SolidLn, 0, ThickWidth);
   SetWriteMode(XORPut);        { XOR mode for rectangle }
   repeat                       { Draw until a key is pressed }
     X1 := Random(GetMaxX - Dx);
     Y1 := Random(GetMaxY - Dy);
     Rectangle(X1, Y1, X1 + Dx, Y1 + Dy);   { Draw it }
     Delay(10);                             { Pause briefly }
     Rectangle(X1, Y1, X1 + Dx, Y1 + Dy);   { Erase it }
   until KeyPressed;
   Readln;
   CloseGraph;
 end.