XNA 2D Cam Zoom不正确

Question

我根据http://www.david-amador.com/2009/10/xna-camera-2d-with-zoom-and-rotation/中的课程构建了一个摄像头。 我目前正在制作一种太空射击游戏（但带有故事和类似内容），并且希望相机能够首先正常工作。 但是Zoom并不能如我所愿。 我真的不知道为什么，但是希望您能对我有所帮助。^问题是，精灵在某个方向上移动了大约30像素。 可能我没有正确设置主太空船的位置，或者相机只是在窃听。 游戏正在全屏模式下运行。

Game1方法：

InputHandler.Update(gameTime, graphics.GraphicsDevice);
        World.Camera.Position = new Vector2(Player.Ship.Position.X + Player.Ship.Texture.Width/2, Player.Ship.Position.Y+Player.Ship.Texture.Height/2);
        World.Camera.Zoom = InputHandler.ZoomValue;

我将主太空船纹理的一半大小添加到了相机位置，以便纹理的中间应该在中间。 没有它也不起作用..

我如何设置全屏（我知道...这不是我应该做的方式，但不适用于普通代码。）

graphics.PreferredBackBufferHeight = 10000;
        graphics.PreferredBackBufferWidth = 10000;
        graphics.ToggleFullScreen();
        graphics.PreferMultiSampling = true;
        graphics.IsFullScreen = true;
        graphics.ApplyChanges(); 

InputHandler类：

 public static void Update(GameTime gameTime, GraphicsDevice graphics)
    {
        _oldKeyboardState = keyboardState;
        _oldMouseState = mouseState;
        keyboardState = Keyboard.GetState();
        mouseState = Mouse.GetState();
        MousePosition = new Vector2(mouseState.X, mouseState.Y);
        MatrixMousePosition = Vector2.Transform(MousePosition, Matrix.Invert(World.Camera.GetTransformation(graphics)));
        OldScrollWheelValue = ScrollWheelValue;
        ScrollWheelValue = mouseState.ScrollWheelValue;

        if (ScrollWheelValue > OldScrollWheelValue) ZoomValue += 0.1f;
        if (ScrollWheelValue < OldScrollWheelValue) ZoomValue -= 0.1f;

        ZoomValue = MathHelper.Clamp(ZoomValue, 0.5f, 1.5f);
    }

最后是相机类：

protected float _zoom; // Camera Zoom
    public Matrix _transform; // Matrix Transform
    public Vector2 _pos; // Camera Position
    protected float _rotation; // Camera Rotation

    public float Zoom
    {
        get { return _zoom; }
        set { _zoom = value; if (_zoom < 0.1f) _zoom = 0.1f; } 
    }

    public float Rotation
    {
        get { return _rotation; }
        set { _rotation = value; }
    }

    public Vector2 Position
    {
        get { return _pos; }
        set { _pos = value; }
    }

    public Camera()
    {
        _zoom = 1.0f;
        _rotation = 0.0f;
        _pos = Vector2.Zero;
    }

    public Matrix GetTransformation(GraphicsDevice graphicsDevice)
    {
        var viewport = graphicsDevice.Viewport;

        _transform =
          Matrix.CreateTranslation(new Vector3(-_pos.X*Zoom, -_pos.Y*Zoom, 0)) *
                                     Matrix.CreateRotationZ(Rotation) *
                                     Matrix.CreateScale(new Vector3(Zoom, Zoom, 1)) *
                                     Matrix.CreateTranslation(new Vector3(viewport.Width * 0.5f, viewport.Height * 0.5f, 0));
        return _transform;
    }

Answer 1

我看到你做错了，这一行：

transform = Matrix.CreateTranslation(new Vector3(-_pos.X*Zoom, -_pos.Y*Zoom, 0)) * ....

应该：

transform = Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) * ....

因为现在缩放时，还可以平移图像，这会导致移动的精灵。