Question

我和我的朋友决定为自己制作游戏。这是一个口袋妖怪和旧的Harvest Moon图形样式。我正在做一些动画测试，我让它工作。我的播放器Sprite Sheet有八个图像（每个方向2个）。

但是，当我按住向上箭头键和向左或向右或向下箭头键以及向左或向右键时，它会尝试同时执行两个动画。我知道必须有办法解决这个问题我只需要有人告诉我如何。

这是我的播放器动画类：

public class Animation
{
    Texture2D texture;
    Rectangle rectangle;
    public Vector2 position;
    Vector2 origin;
    Vector2 velocity;

    int currentFrame;
    int frameHeight;
    int frameWidth;

    float timer;
    float interval = 75;

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

    public void Update(GameTime gameTime)
    {
        rectangle = new Rectangle(currentFrame * frameWidth, 0, frameWidth, frameHeight);
        origin = new Vector2(rectangle.Width / 2, rectangle.Height / 2);
        position = position + velocity;

        // Comment Out For Camera!!!!
        if (position.X <= 0 + 10) position.X = 0 + 10;
        if (position.X >= 1920 - rectangle.Width + 5) position.X = 1920 - rectangle.Width + 5;
        if (position.Y <= 0 + 10) position.Y = 0 + 10;
        if (position.Y >= 1080 - rectangle.Height + 7) position.Y = 1080 - rectangle.Height + 7;

        if (Keyboard.GetState().IsKeyDown(Keys.Right))
        {
            AnimateRight(gameTime);
            velocity.X = 2;
        }
        else if (Keyboard.GetState().IsKeyDown(Keys.Left))
        {
            AnimateLeft(gameTime);
            velocity.X = -2;
        }
        else velocity = Vector2.Zero;

        if (Keyboard.GetState().IsKeyDown(Keys.Up))
        {
            AnimateUp(gameTime);
            velocity.Y = -2;
        }
        if (Keyboard.GetState().IsKeyDown(Keys.Down))
        {
            AnimateDown(gameTime);
            velocity.Y = 2;
        }
    }

    public void AnimateRight(GameTime gameTime)
    {
            timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;
            if (timer > interval)
            {
                currentFrame++;
                timer = 0;
                if (currentFrame > 1)
                    currentFrame = 0;
            }
    }

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

    public void AnimateDown(GameTime gameTime)
    {
            timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;
            if (timer > interval)
            {
                currentFrame++;
                timer = 0;
                if (currentFrame > 7 || currentFrame < 6)
                    currentFrame = 6;
            }
    }

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

Answer 1

这样可以一次只在一个方向上移动（如果你遵循口袋妖怪的游戏风格，我相信这就是你想要的）：

    if (Keyboard.GetState().IsKeyDown(Keys.Right))
    {
        AnimateRight(gameTime);
        velocity.X = 2;
    }
    else if (Keyboard.GetState().IsKeyDown(Keys.Left))
    {
        AnimateLeft(gameTime);
        velocity.X = -2;
    }       
    else if (Keyboard.GetState().IsKeyDown(Keys.Up))
    {
        AnimateUp(gameTime);
        velocity.Y = -2;
    }
    else if (Keyboard.GetState().IsKeyDown(Keys.Down))
    {
        AnimateDown(gameTime);
        velocity.Y = 2;
    }
    else velocity = Vector2.Zero;

如果您想同时移动两个方向，例如：

    bool animated = false;
    if (Keyboard.GetState().IsKeyDown(Keys.Right))
    {
        AnimateRight(gameTime);
        velocity.X = 2;
        animated = true;
    }
    else if (Keyboard.GetState().IsKeyDown(Keys.Left))
    {
        AnimateLeft(gameTime);
        velocity.X = -2;
        animated = true;
    }    
    else
    {
         velocity.X = 0;
    }  

    if (Keyboard.GetState().IsKeyDown(Keys.Up))
    {
        if(animated == false)
        {   AnimateUp(gameTime); }

        velocity.Y = -2;
    }
    else if (Keyboard.GetState().IsKeyDown(Keys.Down))
    {
        if(animated == false)
        { AnimateDown(gameTime); }
        velocity.Y = 2;
    }
    else velocity.Y = 0;

Answer 2

我知道这有点旧了，但是在这种情况下，如果同时按下两个键，则播放器无法控制影响其移动方向的顺序优先级。更好的解决方案是：

velocity = Vector2.Zero;

if (Keyboard.GetState().IsKeyDown(Keys.Right))
    velocity.X += 2;
if (Keyboard.GetState().IsKeyDown(Keys.Left))
    velocity.X -= 2;

if (Keyboard.GetState().IsKeyDown(Keys.Up))
    velocity.Y -= 2;
if (Keyboard.GetState().IsKeyDown(Keys.Down))
    velocity.Y += 2;

if (velocity.X > 0)
    AnimateRight(gameTime);
else if (velocity.X < 0)
    AnimateLeft(gameTime);

// Animate Up/Down only if Left/Right does not... 
// not sure if needed but will follow the style.
if (velocity.X == 0) 
{
    if (velocity.Y > 0)
        AnimateDown(gameTime);
    else if (velocity.Y < 0)
        AnimateUp(gameTime);
}

这样，我们将输入和逻辑分开，这使得事情更加清晰，我们不会优先于某些输入（xept用于向上/向下......但是w / e）如果玩家尝试在同一时间左右移动，该动作将被取消。

XNA / C＃2D播放器动画问题

2 个答案: