unit2.pas

有关多媒体的各个细节

unit Unit2;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    CanMoveFlag:Boolean;
    Move_X,Move_Y:Integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

//移动的开始或停止
procedure TForm1.Button1Click(Sender: TObject);
begin
 if CanMoveFlag then
  begin
   CanMoveFlag:=False;
   Button1.Caption:='开始';
  end
 else
  begin
   CanMoveFlag:=True;
   Button1.Caption:='停止';
  end;
end;

//初始化变量
procedure TForm1.FormCreate(Sender: TObject);
begin
 CanMoveFlag:=False;
 Move_X:=Form1.Width;
 Move_Y:=100;
end;

//使用TextOut方式实现
procedure TForm1.Timer1Timer(Sender: TObject);
begin
 if CanMoveFlag then
  begin
   Form1.Canvas.Pen.Color:=clWhite;//设置画笔颜色
   Form1.Canvas.FillRect(Rect(0,0,Form1.Width,Form1.Height));//清屏
   if Move_X<0 then
     Move_X:=Form1.Width//超过左边屏幕,重新赋值
   else
     Move_X:=Move_X-10;//递减横坐标
     Form1.Canvas.TextOut(Move_X,Move_Y,'TextOut 方式');
  end;
end;

end.