ucreatehatchbrush.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit UCreateHatchBrush;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
   TheBrush: HBRUSH;    // holds the new brush
   HandleRgn: THandle;  // a region handle
begin
  {create the hatch brush}
  TheBrush := CreateHatchBrush(HS_DIAGCROSS, clRed);

  {create a region}
  HandleRgn := CreateEllipticRgnIndirect(ClientRect);

  {fill the region with the brush}
  FillRgn(Canvas.Handle, HandleRgn, TheBrush);

  {delete the brush and region}
  DeleteObject(TheBrush);
  DeleteObject(HandleRgn);
end;

end.