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Question

我試圖用C＃和XNA框架構建一個突破遊戲。我已經將磚塊放入一個單獨的類中，並創建了一個可載入10塊磚的數組。但是，當我運行遊戲時，實際上沒有出現磚塊，並且我似乎無法找到該錯誤，因爲Visual Studio沒有標記任何東西。

磚類：

class bricks 
{ 
    Texture2D brickimg; 
    Rectangle rectangle; 
    int[] brickXPos = new int[50]; 
    int[] brickYPos = new int[50]; 

    public bricks(Texture2D NewTexture, Rectangle newRectangle) 
    { 
     brickimg = NewTexture; 
     rectangle = newRectangle; 
    } 

    public void Initialize() 
    { 
     for (int i = 0; i < 50; i++) 
     { 
      brickXPos[i] = 300 + i * 60; 
      brickYPos[i] = 100; 
     } 
    } 

    public void Update() 
    { 
    } 

    public void Draw(SpriteBatch spritebatch) 
    { 
     for (int i = 0; i < 50; i++) 
     { 
      spritebatch.Draw(brickimg, new Vector2(brickXPos[i], brickYPos[i]), rectangle, Color.White); 
     } 
    } 
} 

主程序：

/// <summary> 
/// This is the main type for your game 
/// </summary> 
public class Breakout : Microsoft.Xna.Framework.Game 
{ 
    GraphicsDeviceManager graphics; 
    SpriteBatch spriteBatch; 
    Texture2D BackgroundImg; 
    bricks bricks; 

    public Breakout() 
    { 
     graphics = new GraphicsDeviceManager(this); 

     graphics.PreferredBackBufferWidth = 1024; 
     graphics.PreferredBackBufferHeight = 768; 
     graphics.ApplyChanges(); 
     Content.RootDirectory = "Content"; 
    } 

    /// <summary> 
    /// Allows the game to perform any initialization it needs to before starting to run. 
    /// This is where it can query for any required services and load any non-graphic 
    /// related content. Calling base.Initialize will enumerate through any components 
    /// and initialize them as well. 
    /// </summary> 
    protected override void Initialize() 
    { 
     // TODO: Add your initialization logic here 

     base.Initialize(); 
    } 

    /// <summary> 
    /// LoadContent will be called once per game and is the place to load 
    /// all of your content. 
    /// </summary> 
    protected override void LoadContent() 
    { 
     // Create a new SpriteBatch, which can be used to draw textures. 
     spriteBatch = new SpriteBatch(GraphicsDevice); 
     BackgroundImg = Content.Load<Texture2D>("starfield"); 
     bricks = new bricks(Content.Load<Texture2D>("redbrick"),new Rectangle()); 
     // TODO: use this.Content to load your game content here 
    } 

    /// <summary> 
    /// UnloadContent will be called once per game and is the place to unload 
    /// all content. 
    /// </summary> 
    protected override void UnloadContent() 
    { 
     // TODO: Unload any non ContentManager content here 
    } 

    /// <summary> 
    /// Allows the game to run logic such as updating the world, 
    /// checking for collisions, gathering input, and playing audio. 
    /// </summary> 
    /// <param name="gameTime">Provides a snapshot of timing values.</param> 
    protected override void Update(GameTime gameTime) 
    { 
     // Allows the game to exit 
     if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) 
      this.Exit(); 

     // TODO: Add your update logic here 

     base.Update(gameTime); 
    } 

    /// <summary> 
    /// This is called when the game should draw itself. 
    /// </summary> 
    /// <param name="gameTime">Provides a snapshot of timing values.</param> 
    protected override void Draw(GameTime gameTime) 
    { 
     GraphicsDevice.Clear(Color.CornflowerBlue); 

     // TODO: Add your drawing code here 

     base.Draw(gameTime); 
     spriteBatch.Begin(); 
      spriteBatch.Draw(BackgroundImg, Vector2.Zero, Color.White); 
      bricks.Draw(spriteBatch); 
      spriteBatch.End(); 
    } 
} 

Answer 1

你從來沒有初始化的對象磚。
您需要在某處調用bricks.Initialise();函數（最好在Breakout類的初始化函數中）。

我也建議你使用一點清潔的代碼標準。
類名通常以大寫字母開頭，即：Bricks而不是bricks，在您的情況下，類和類的實例具有相同的名稱（bricks），這可能會造成混淆，甚至應該創建編譯器錯誤（我認爲？）。
（brick類的構造函數中的'NewTexture'變量也會受到錯誤命名的影響，或許應該命名爲newTexture，特別是由於Rect被稱爲newRectangle的事實 - 但這不是代碼審閱站點，所以生病了，現在就離開這個問題！）。

Answer 2

嘗試將null轉換成您磚類中的spriteBatch.Draw的參數sourceRectangle。我認爲你傳遞的矩形是不好的。

spritebatch.Draw(brickimg, new Vector2(brickXPos[i], brickYPos[i]), null, Color.White);