Question

Hello stackoverflow！

我正在使用MonoGame在C＃上制作2D sidescroller冒险游戏，我遇到了一个特殊的问题。

简而言之：玩家实例已经指定了一个包含玩家纹理的Texture2D（在本例中是一个带有2px绿色边框的蓝色框）当玩家移动时，纹理“保持原位”，当玩家离开纹理所在的空间时，玩家逐渐变为绿色。这当然不应该发生，因为每次调用Draw（）时都应该在Player的确切位置重新绘制纹理。

换句话说 - 无论移动到哪里，玩家仍然应该是一个带有2px绿色边框的蓝框。

图片以便更好地说明：

原始状态

玩家向下移动，留下纹理。

直到他完全变绿。

当他回到原来的位置时，正确的纹理再次开始显示

我已经将代码减少到它的骨干，但问题仍然存在。

Game.cs没有任何有趣的内容，播放器初始化和Draw方法在这里：

//inside of Initialize()
player = new Player(GraphicsDevice, Vector2.Zero);


protected override void Draw(GameTime gameTime) {
        GraphicsDevice.Clear(Color.CornflowerBlue);

        levelSpriteBatch.Begin();
        player.Draw(gameTime, levelSpriteBatch);
        levelSpriteBatch.End();

        base.Draw(gameTime);
    }

Player.cs（整个文件）：

    class Player {
        public Vector2 Position
        {
            get { return position; }
        }
        Vector2 position;

    public Texture2D Texture { get; private set; }

    public const int Width = 32;
    public const int Height = 32;

    // Input configuration
    private const Keys leftButton = Keys.A;
    private const Keys rightButton = Keys.D;
    private const Keys upButton = Keys.W;
    private const Keys downButton = Keys.S;


    //Current state
    private float LRmovement;
    private float UDmovement;

    public Player(GraphicsDevice graphicsDevice, Vector2 position) {
        this.position = position;
        CreateTexture(graphicsDevice, Width, Height);
    }

    public void Update(GameTime gameTime, KeyboardState keyboardState) {
        GetInput(keyboardState);

        position.X += LRmovement;
        position.Y += UDmovement;

        LRmovement = 0.0f;
        UDmovement = 0.0f;
    }

    private void CreateTexture(GraphicsDevice graphicsDevice, int width, int height) {
        Texture = new Texture2D(graphicsDevice, width, height);

        GraphicsHelper.FillRectangle(Texture, Color.Red);
        GraphicsHelper.OutlineRectangle(Texture, Color.Green, 2);
    }

    private void GetInput(KeyboardState keyboardState) {
        LRmovement = 0;
        UDmovement = 0;

        if (Math.Abs(LRmovement) < 0.5f)
            LRmovement = 0.0f;

        if (Math.Abs(UDmovement) < 0.5f)
            UDmovement = 0.0f;

        if (keyboardState.IsKeyDown(leftButton))
            LRmovement = -1.0f;
        else if (keyboardState.IsKeyDown(rightButton))
            LRmovement = 1.0f;

        if (keyboardState.IsKeyDown(upButton))
            UDmovement = -1.0f;
        else if (keyboardState.IsKeyDown(downButton))
            UDmovement = 1.0f;
    }

    public void Draw(GameTime gameTime, SpriteBatch spriteBatch) {
        spriteBatch.Draw(Texture, position, new Rectangle((int)Position.X, (int)Position.Y, Width, Height), Color.White);
    }
}

和GraphicsHelper.cs：

class GraphicsHelper {
    public static void FillRectangle(Texture2D texture, Color fill) {
        Color[] color = new Color[texture.Width * texture.Height];
        texture.GetData(color);

        for (int i = 0; i < texture.Width * texture.Height; ++i)
            color[i] = fill;

        texture.SetData(color);
    }

    public static void OutlineRectangle(Texture2D texture, Color outline, int outlineWidth) {
        Color[] color = new Color[texture.Width * texture.Height];
        texture.GetData(color);

        int index = 0;
        for (int y = 0; y < texture.Height; ++y) {
            for (int x = 0; x < texture.Width; ++x) {
                if (y < outlineWidth || x < outlineWidth || y > texture.Height - outlineWidth || x > texture.Width - outlineWidth)
                    color[index] = outline;
                ++index;
            }
        }
        texture.SetData(color);
    }
}

这是所有代码。说实话，我真的没有想法。

Answer 1

这是有问题的一行：

spriteBatch.Draw(Texture, position, new Rectangle((int)Position.X, (int)Position.Y, Width, Height), Color.White);

第三个参数（矩形）定义要绘制的纹理部分。而你总是想要绘制纹理的相同部分，因此你应该传递一个恒定的矩形。

实际上，如果您只想绘制整个纹理，请传递null：

spriteBatch.Draw(Texture, position, null, Color.White);

玩家移动时纹理保持不变

1 个答案: