unit1.pas

Delphi7应用编程150例 附书源码

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
    pt: array [0..4] of TPoint;
	m_rgn: HRGN;
begin
	pt[0].x:=self.Width div 2;
	pt[0].y:=0;
	pt[1].x:=0;
	pt[1].y:=self.Height div 2;
	pt[2].x:=self.Width div 2;
	pt[2].y:=self.Height;
	pt[3].x:=self.Width;
	pt[3].y:=self.Height div 2;
    pt[4].x:=self.Width;
    pt[4].y:=0;

	m_rgn:=CreatePolygonRgn(pt,5,WINDING);
	SetWindowRgn(self.Handle,m_rgn,TRUE);
end;

end.