unit1.~pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    RadioButton2: TRadioButton;
    RadioButton1: TRadioButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure RadioButton1Click(Sender: TObject);
    procedure RadioButton2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
 Var

  
  FName:String;
{$R *.dfm}
Procedure  btile() ;
var
    Bitmap:TBitmap;
  begin
      Bitmap:=TBitmap.Create ;
      Bitmap.LoadFromFile(FName );
      Form1.Canvas.Brush.Bitmap :=Bitmap;
      Form1.Canvas.rectangle(0,0,Form1.width,Form1.height);
      Bitmap:=nil;
  end;
Procedure bStretch();
  var
    Picture:TPicture;
  begin
     Picture:=TPicture.Create ;
     Picture.LoadFromFile(FName );
     Form1.Canvas.Stretchdraw(Rect(0,0,Form1.width,Form1.height),Picture.Graphic );
     Picture:=nil;
  end;

procedure TForm1.Button1Click(Sender: TObject);
 begin
   If OpenDialog1.Execute then
      begin
          Fname:=OpenDialog1.FileName ;
          if RadioButton1.Checked then
              btile
           else
              bStretch;
      end;

end;

procedure TForm1.FormCreate(Sender: TObject);
var
  CurDir:String;
begin
  GetDir(0,CurDir);
  FName:=CurDir+'\Default.BMP';

  
end;

procedure TForm1.RadioButton1Click(Sender: TObject);
begin
   BTile;
end;

procedure TForm1.RadioButton2Click(Sender: TObject);
begin
  Bstretch;
end;

end.