unit Unit1;

interface

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

type
  //이동 방향 타입
  TDirect = (mvLeft, mvRight);
  TForm1 = class(TForm)
    Timer1: TTimer;
    Image1: TImage;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
    Direct: TDirect default mvRight;
  public
    { Public declarations }
  end;

//한번에 이동할 크기
const
  MoveSize = 10;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  if Direct = mvRight then begin
  //우측 이동시
    if Image1.Left + Image1.Width >= self.Width then begin
    //오른쪽 끝에 다왔을 경우.
      Direct := mvLeft;
    end
    else begin
      Image1.Left := Image1.Left + MoveSize;
    end;
  end
  else begin
    //좌측 이동시
    if Image1.Left <= 0 then begin
    //왼쪽 끝에 다왔을 경우
      Direct := mvRight;
    end
    else begin
      Image1.Left := Image1.Left - MoveSize;
    end;
  end;
end;

end.