{Getasprt.PAS}
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 {Sample code for the GetAspectRatio procedure.}

  uses Graph;

 var
   Gd, Gm: Integer;
   Xasp, Yasp: Word;
   XSideLength, YSideLength: Integer;
 begin
   Gd := Detect;
   InitGraph(Gd, Gm, '');
   if GraphResult <> grOk then
     Halt(1);
   GetAspectRatio(Xasp, Yasp);
   XSideLength := 20;

   { Adjust Y length for aspect ratio }
   YSideLength := Round( (Xasp / Yasp) * XSideLength);

   { Draw a "square" rectangle on the screen }
   Rectangle(0, 0, XSideLength, YSideLength);
   Readln;
   CloseGraph;
 end.