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您如何查看密钥是否已被释放？

我想例如，当用户释放Left键时，角色的动画停止并停留在他正在看/面向左的框架上

这是我的播放器类：

public class Player
{
    #region Animation
    int currentFrame;
    int frameWidth;
    int frameHeight;

    float timer;
    float interval = 65;
    #endregion

    private Texture2D texture;
    private Vector2 position = new Vector2(64, 200);
    private Vector2 velocity;
    private Rectangle rectangle;
    private bool isMoving;

    KeyboardState keyState;

    public enum playerStates
    {
        RIGHT,
        LEFT,
        WALKINGRIGHT,
        WALKINGLEFT
    }

    playerStates currentPlayerState = playerStates.LEFT;

    private bool hasJumped = false;

    public Vector2 Position
    {
        get { return position; }
    }

    public Player(Texture2D newTexture, Vector2 newPosition, int newFrameWidth, int newFrameHeight)
    {
        texture = newTexture;
        position = newPosition;
        frameWidth = newFrameWidth;
        frameHeight = newFrameHeight;

        isMoving = false;
    }

    public void LoadContent(ContentManager Content)
    {
        texture = Content.Load<Texture2D>("Mario/full");
    }

    public void Update(GameTime gameTime)
    {
        rectangle = new Rectangle(currentFrame * frameWidth, 0, frameWidth, frameHeight);
        position = position + velocity;

        #region Key Presses

        KeyboardState lastKeyState = keyState;

        keyState = Keyboard.GetState();

        if (keyState.IsKeyDown(Keys.Left))
        {
            //position.X -= 1;
            AnimateLeft(gameTime);
            currentPlayerState = playerStates.LEFT;
            isMoving = true;
        }

        if (keyState.IsKeyDown(Keys.Right))
        {
            //position.X -= 1;
            AnimateRight(gameTime);
            currentPlayerState = playerStates.RIGHT;
            isMoving = true;
        }


        //Check for last keypresses

        #endregion
    }

    public void Draw(SpriteBatch spriteBatch)
    {
        spriteBatch.Draw(texture, position, rectangle, Color.White, 0f, Vector2.Zero, 1.0f, SpriteEffects.None, 1);
    }

    #region DrawAnimation

    public void AnimateLeft(GameTime gameTime)
    {
        timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;
        if (timer > interval)
        {
            currentFrame++;
            timer = 0;
            if (currentFrame > 3 || currentFrame < 2)
            {
                currentFrame = 2;
            }
        }
    }

    public void AnimateRight(GameTime gameTime)
    {
        timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;
        if (timer > interval)
        {
            currentFrame++;
            timer = 0;
            if (currentFrame > 5 || currentFrame < 3)
            {
                currentFrame = 4;
            }
        }
    }

    #endregion
}
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1 回答 1

2

如果要检查某个键是否“切换”或按下，则需要使用两个KeyboardStates，一个用于当前帧，一个用于最后一帧。看起来你已经经历了一些这样的事情，但我会从这里开始

public static KeyboardState CurrentKeyboardState;
public static KeyboardState LastKeyboardState;

在您的更新方法中，您需要设置这些

LastKeyboardState = CurrentKeyboardState;
CurrentKeyboardState = Keyboard.GetState();

为了检查一个键是否被按下，它必须向下一帧，然后向上一帧。所以我们可以检查一下。

if (LastKeyboardState.IsKeyDown(Keys.Left) && !CurrentKeyboardState.IsKeyDown(Keys.Left))
     //Do Stuff

你可以做我做过的事情，并做一个方便的扩展方法，这样你就可以简单地做if (Keys.Left.IsKeyToggled). 如果您以前没有使用过扩展方法，可以在此处阅读它们。您将需要一个静态类

  public static class Extensions
  {
  }

并且只需使用具有我们上面使用的代码的方法，将“类”替换为具有键盘状态的任何类。

   public static bool IsKeyToggled(this Keys key)
   {
        return Class.LastKeyboardState.IsKeyDown(key) && !Class.CurrentKeyboardState.IsKeyDown(key)
   }
于 2013-08-31T18:07:18.220 回答