玩家移动时纹理保持原位

Question

你好Whosebug！

我正在使用 MonoGame 在 C# 中开发一款 2D sidescroller 冒险游戏，我遇到了一个特殊问题。

简而言之：Player 实例已经分配了一个包含玩家纹理的 Texture2D（在这个例子中是一个带有 2px 绿色边框的蓝色框）当玩家移动时，纹理 "stays in place" 和玩家离开纹理所在的 space 时逐渐变为绿色。这当然不应该发生，因为纹理应该在每次调用 Draw() 时在 Player 的确切位置重新绘制。

换句话说 - 玩家无论移动到哪里都应该仍然是一个带有 2px 绿色边框的蓝色框。

为了更好地说明图片：

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

我已将代码缩减到最基本的部分，但问题仍然存在。

Game.cs没有什么有趣的东西，Player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）在这里：

    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);
    }
}

这就是全部代码。老实说，我没有想法。

Answer 1

这是有问题的行：

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

第三个参数（矩形）定义绘制纹理的哪一部分。而且你总是想绘制纹理的相同部分，因此你应该传递一个常量矩形。

实际上，如果你只是想绘制整个纹理，通过null:

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

玩家移动时纹理保持原位

Texture stays in place while player moves

c#

textures

monogame

texture2d