private void Form1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
Close();
}
switch (state)
{
case State.START:
ChangeState(State.PLAYING);
break;
case State.PLAYING:
player.keyDown(e.KeyCode);
break;
case State.END:
init();
ChangeState(State.START);
break;
}
}