Draw Polygon in Form

Type

PtsType = array [0..15, 0..1] of Integer;

const

Pts: PtsType = ((0, 0), (800, 0), (800, 600),

(200, 600), (200, 220), (300, 280),

(265, 205), (350, 117), (205, 170),

(120, 90), (130, 200), (60, 350), (200, 220),

(200, 600), (0, 600), (0, 0));

procedure TForm1.Button1Click(Sender: TObject);

var

HRegion1: THandle;

begin

HRegion1 := CreatePolygonRgn(Pts, SizeOf(Pts) div 8, alternate);

SetWindowRgn(Handle, HRegion1, True);

end;