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Delphi source code for Components >> Make a Hole in a form


Category: Components
Title: Make a Hole in a form
Date added: 15.03.2006
Hits: 9613



procedure TForm1.Button1Click(Sender: TObject);
var
  region1, region2: hrgn;
begin
  region1 := CreateRectRgn(0, 0, Width, Height);
  region2 := CreateEllipticRgn(30, 30, 200, 200);
  CombineRgn(region1, region1, region2, RGN_DIFF);
  SetWindowRgn(Handle, region1, True);
end;


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