/// <summary>
 /// puckが塗りつぶす色を変更する
 /// </summary>
 /// <param name="pad">puckに当たったpad</param>
 /// <param name="puck">対象のpuck</param>
 public void ChangeColor(GameObject pad, Puck puck)
 {
     if (pad == humanPadObj)
     {
         puck.UpdateLastCollisionPlayer(PlayerType.Human);
     }
     else if (pad == aiPadObj)
     {
         puck.UpdateLastCollisionPlayer(PlayerType.Ai);
     }
     else
     {
         puck.UpdateLastCollisionPlayer(PlayerType.None);
     }
 }