使用XNA和C＃在X和Y軸上進行2D視差背景

Question

我正在使用XNA從事太空射擊游戲，並已按照多個教程來創建視差背景。 到目前為止，我可以使它沿X軸或Y軸移動，但不能同時沿兩個軸移動。 我有一個跟隨玩家的攝像機類，它隨玩家移動（而不是“世界”），因為我認為僅移動玩家會比在玩家周圍移動其他物體容易。

到目前為止，背景還不能跟上播放器的步伐，也無法同時理解兩個軸。 我想到了一個圖塊引擎，但這不會讓我視差不同的層次嗎？

誰能幫助我了解我需要做什么，或者推薦一個可以同時做兩個軸的教程？ 這次我似乎找不到自己的答案。

這是我的背景課的代碼：

class Background
{
    // Textures to hold the two background images
    Texture2D spaceBackground, starsParallax;

    int backgroundWidth = 2048;
    int backgroundHeight = 2048;

    int parallaxWidth = 2048;
    int parallaxHeight = 2048;

    int backgroundWidthOffset;
    int backgroundHeightOffset;

    int parallaxWidthOffset;
    int parallaxHeightOffset;

    public int BackgroundWidthOffset
    {
        get { return backgroundWidthOffset; }
        set
        {
            backgroundWidthOffset = value;
            if (backgroundWidthOffset < 0)
            {
                backgroundWidthOffset += backgroundWidth;
            }
            if (backgroundWidthOffset > backgroundWidth)
            {
                backgroundWidthOffset -= backgroundWidth;
            }
        }
    }

    public int BackgroundHeightOffset
    {
        get { return backgroundHeightOffset; }
        set
        {
            backgroundHeightOffset = value;
            if (backgroundHeightOffset < 0)
            {
                backgroundHeightOffset += backgroundHeight;
            }
            if (backgroundHeightOffset > backgroundHeight)
            {
                backgroundHeightOffset -= backgroundHeight;
            }
        }
    }

    public int ParallaxWidthOffset
    {
        get { return parallaxWidthOffset; }
        set
        {
            parallaxWidthOffset = value;
            if (parallaxWidthOffset < 0)
            {
                parallaxWidthOffset += parallaxWidth;
            }
            if (parallaxWidthOffset > parallaxWidth)
            {
                parallaxWidthOffset -= parallaxWidth;
            }
        }
    }

    public int ParallaxHeightOffset
    {
        get { return parallaxHeightOffset; }
        set
        {
            parallaxHeightOffset = value;
            if (parallaxHeightOffset < 0)
            {
                parallaxHeightOffset += parallaxHeight;
            }
            if (parallaxHeightOffset > parallaxHeight)
            {
                parallaxHeightOffset -= parallaxHeight;
            }
        }
    }

    // Constructor when passed a Content Manager and two strings
    public Background(ContentManager content,
                      string sBackground, string sParallax)
    {
        spaceBackground = content.Load<Texture2D>(sBackground);
        backgroundWidth = spaceBackground.Width;
        backgroundHeight = spaceBackground.Height;

        starsParallax = content.Load<Texture2D>(sParallax);
        parallaxWidth = starsParallax.Width;
        parallaxHeight = starsParallax.Height;
    }

    public void Draw(SpriteBatch spriteBatch)
    {
        // Draw the background panel, offset by the player's location
        spriteBatch.Draw(
            spaceBackground,
            new Rectangle(-1 * backgroundWidthOffset,
                          -1 * backgroundHeightOffset, 
                          backgroundWidth,
                          backgroundHeight),
            Color.White);

        // If the right edge of the background panel will end 
        // within the bounds of the display, draw a second copy 
        // of the background at that location.
        if (backgroundWidthOffset > backgroundWidth)
        {
            spriteBatch.Draw(
                spaceBackground,
                new Rectangle(
                  (-1 * backgroundWidthOffset) + backgroundWidth, 0,
                  backgroundWidth, backgroundHeight),
                Color.White);
        }
        else //(backgroundHeightOffset > backgroundHeight - viewportHeight)
        {
            spriteBatch.Draw(
                spaceBackground,
                new Rectangle(
                  0, (-1 * backgroundHeightOffset) + backgroundHeight,
                  backgroundHeight, backgroundHeight),
                Color.White);
        }

        // Draw the parallax star field
        spriteBatch.Draw(
            starsParallax,
            new Rectangle(-1 * parallaxWidthOffset,
                            0, parallaxWidth,
                            parallaxHeight),
            Color.SlateGray);
        // if the player is past the point where the star 
        // field will end on the active screen we need 
        // to draw a second copy of it to cover the 
        // remaining screen area.
        if (parallaxWidthOffset > parallaxWidth)
        {
            spriteBatch.Draw(
                starsParallax,
                new Rectangle(
                    (-1 * parallaxWidthOffset) + parallaxWidth,
                    0,
                    parallaxWidth,
                    parallaxHeight),
                Color.White);
        }
    }
}

然后，主游戲與玩家一起打結來移動背景。

background.BackgroundWidthOffset -= 2;
background.ParallaxWidthOffset -= 1;

從外觀上看，背景有點跳躍，並且似乎隨機跳過或重疊背景圖塊。

Answer 1

我過去使用過這種方法，效果很好：

http://www.david-gouveia.com/scrolling-textures-with-zoom-and-rotation/

它使用着色器來實現效果，從而實現了快速的實現。

Answer 2

有一個完整的例子在這里 。