WinAPI: CreatePolygonRgn - 建立多边形区域

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;

type
TForm1 = class(TForm)
procedure FormPaint(Sender: TObject);
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormPaint(Sender: TObject);
var
ps: array[0..9] of TPoint;
Rgn: HRGN;
begin
ps[0] := Point(120, 5);
ps[1] := Point(140, 70);
ps[2] := Point(210, 70);
ps[3] := Point(150, 100);
ps[4] := Point(180, 175);
ps[5] := Point(120, 120);
ps[6] := Point(60, 175);
ps[7] := Point(90, 100);
ps[8] := Point(30, 70);
ps[9] := Point(100, 70);

{建立多边形区域}
Rgn := CreatePolygonRgn(ps, Length(ps), WINDING);

{填充区域}
Canvas.Brush.Color := clSilver;
Canvas.Brush.Style := bsCross;
FillRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle);

{绘制区域边界}
Canvas.Brush.Color := clRed;
Canvas.Brush.Style := bsSolid;
FrameRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle, 2, 2);
DeleteObject(Rgn);
end;

end.