GDI+ 库

uses Winapi.GDIPAPI, Winapi.GDIPOBJ{, Winapi.GDIPUTIL};

procedure TForm1.FormPaint(Sender: TObject);
var
  graphics: TGPGraphics;
  pen: TGPPen;
begin
  graphics := TGPGraphics.Create(Canvas.Handle);
  pen := TGPPen.Create(MakeColor(255,0,0));
  graphics.DrawRectangle(pen, MakeRect(11, 22, 33, 44));
  pen.Free;
  graphics.Free;
end;

http://www.cnblogs.com/del/category/113557.html