unitfrmmain.pas

《Delphi实用程序100例》配套书源码盘

unit unitFrmMain;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Image1: TImage;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);

  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  newbmp: TBitmap;
  i, j, bmpheight, bmpwidth: integer;
begin
  newbmp := TBitmap.Create;
  newbmp.Width := image1.Width;
  newbmp.Height := image1.Height;
  bmpheight := image1.Height;
  bmpwidth := image1.Width;
  i := 0;

  while i <= bmpwidth do
    begin
      j := i;
      while j > 0 do
        begin
          newbmp.Canvas.CopyRect(Rect(j - 1, 0, j, bmpheight), image1.Canvas, Rect(bmpwidth - i + j - 1, 0, bmpwidth - i + j, bmpheight));
          newbmp.Canvas.CopyRect(Rect(bmpwidth - j, 0, bmpwidth - j + 1, bmpheight), image1.Canvas, Rect(i - j, 0, i - j + 1, bmpheight));
          j := j - 2;
        end;
      form1.Canvas.Draw(120, 100, newbmp);
      i := i + 2;
    end;
  newbmp.free;
end;


procedure TForm1.Button2Click(Sender: TObject);
var
  newbmp: TBitmap;
  i, j, bmpheight, bmpwidth: integer;
begin
  newbmp := TBitmap.Create;
  newbmp.Width := image1.Width;
  newbmp.Height := image1.Height;
  bmpheight := image1.Height;
  bmpwidth := image1.Width;
  i := bmpheight;
  while i > 0 do
    begin
      for j := 10 to i do
        begin
          newbmp.Canvas.CopyRect(Rect(0, j - 10, bmpwidth, j),
            image1.Canvas,
            Rect(0, i - 10, bmpwidth, i));
          form1.Canvas.Draw(120, 100, newbmp);
        end;
      i := i - 10;
    end;
  newbmp.free;
end;


end.