我需要碰撞，使一個對象坐在另一個AndEngine

Question

我有一個遊戲，與陀螺儀，我控制幾塊。現在問題是我已經在我的andengine代碼中使用了box2d，但是這些物體似乎並沒有對另一個做出反應，導致它們重疊，而不是真正做物理的東西。

在我onCreateScene我有這樣的：

@Override 
protected Scene onCreateScene() { 
    this.mMainScene = new Scene(); 
    backgroundSprite = new Sprite(0, 0, this.mBackgroundTextureRegion, getVertexBufferObjectManager()); 

physicsWorld = new PhysicsWorld(new Vector2(0, 0), false); 

final Player oPlayer = new Player(centerX, centerY, this.goodTiledTextureRegion, this.getVertexBufferObjectManager(), MainActivity.this, playerID, 0); 
    player_fix = PhysicsFactory.createFixtureDef(10.0f, 0.2f, 1.0f); 
    body = PhysicsFactory.createBoxBody(physicsWorld, oPlayer, BodyType.DynamicBody, player_fix); 
    oPlayer.setBody(body); 
    playerID++; 
    players.add(oPlayer); 
    for (Player player : players) { 
     player.setPlayers(players); 
     mMainScene.attachChild(player); 
     physicsWorld.registerPhysicsConnector(new PhysicsConnector(player, body, true, false)); 
     mMainScene.registerTouchArea(player); 
    } 

this.mMainScene.registerUpdateHandler(physicsWorld); 
this.mMainScene.registerUpdateHandler(new TimerHandler(0.1f, true, new ITimerCallback() { 
     @Override 
     public void onTimePassed(final TimerHandler pTimerHandler) { 
         Player player = new Player(random, 5, goodTiledTextureRegion, getVertexBufferObjectManager(), MainActivity.this, playerID, 0); 
       body = PhysicsFactory.createBoxBody(physicsWorld, player, BodyType.DynamicBody, player_fix); 
          player.setBody(body); 
          players.add(player); 
mMainScene.detachChildren(); 
        mMainScene.attachChild(backgroundSprite); 
        for (Player player : players) { 
         player.setPlayers(players); 
         mMainScene.attachChild(player); 
         player.body.setLinearVelocity(AccelerometerHelper.TILTX * 5, AccelerometerHelper.TILTY * 5); 
         physicsWorld.registerPhysicsConnector(new PhysicsConnector(player, body, true, false)); 
         mMainScene.registerTouchArea(player); 
        } 
} 

return this.mMainScene; 

} 

現在，我創建了現場，我創建了物理世界。 然後我創建我的第一個「玩家」，（這是一個精靈，我移動）。我爲它創建了一個body，並且在我的Player.class（entity）中設置了這個body。從其實體訪問每個玩家身體。然後在每一次更新中（代碼稍微長一點，但是我拿出了與物理學沒有關係的東西），我創建了一個新玩家。然後對於我的數組列表中的每個玩家（玩家），我在加速度計之後設置線速度，以使其移動。問題是，如果一個玩家擊中另一個玩家，它們會重疊，並且不會對此產生反應。

玩家夾具到處都是一樣的player_fix = PhysicsFactory.createFixtureDef(10.0f, 0.2f, 1.0f); BodyType總是DynamicBody。有人能告訴我我缺少什麼嗎？

Answer 1

您可以從http://code.google.com/p/andenginephysicsbox2dextension/下載。

我使用Eclipse，並將其添加爲項目。然後我將其納入我的項目。 我也推薦項目AndEngineExamples，它向你展示各種漂亮的工具。

下面是我添加牆：

final Rectangle wall = new Rectangle(pX, pY, pWidth, pHeight, pVman); // pvman is the ObjectVertexBufferManager 
wall.setIgnoreUpdate(true); 


Body body = PhysicsFactory.createBoxBody(
    pParent.mPhysicsWorld, 
    wall, 
    BodyType.StaticBody, 
    Environment.WALL_FIXTURE_DEF 
); 
    pScene.getFirstChild().attachChild(wall); 
    pParent.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(wall, body, true, true)); 
    // pParent is of type GameActivity. 

的WALL_FIXTURE_DEF是：

 /* The categories. */ 
public static final short CATEGORYBIT_WALL = 1; 
public static final short CATEGORYBIT_MONNING = 2; 
public static final short CATEGORYBIT_WHEEL = 4; 

/* And what should collide with what. */ 
public static final short MASKBITS_WALL = CATEGORYBIT_WALL + CATEGORYBIT_MONNING + CATEGORYBIT_WHEEL; 
public static final short MASKBITS_MONNING = CATEGORYBIT_WALL; 
public static final short MASKBITS_WHEEL = CATEGORYBIT_WALL; 

public static final FixtureDef WALL_FIXTURE_DEF = PhysicsFactory.createFixtureDef(0, 0f, 0.9f, false, CATEGORYBIT_WALL, MASKBITS_WALL, (short)0); 
public static final FixtureDef MONNING_FIXTURE_DEF = PhysicsFactory.createFixtureDef(10, 0f, 0f, false, CATEGORYBIT_MONNING, MASKBITS_MONNING, (short)0); 
public static final FixtureDef WHEEL_FIXTURE_DEF = PhysicsFactory.createFixtureDef(20, 0f, 10f, false, CATEGORYBIT_WHEEL, MASKBITS_WHEEL, (short)0); 
public static final float GRAVITY_MONNINGS = 2*SensorManager.GRAVITY_EARTH; 

這也處理使用MASK_BITS碰撞。 Monnings和Wheels不應該相互碰撞，但它們應該與Walls碰撞。

的物理世界，因爲這在createScene函數創建：

this.mPhysicsWorld = new FixedStepPhysicsWorld(Environment.FPS, new Vector2(0, Environment.GRAVITY_MONNINGS), false); 

再次AndEngineExamples項目（http://code.google.com/p/andengineexamples/）是安裝必須的。

這可能是您需要的代碼。請注意，我還沒有運行該代碼，所以它可能包含的錯誤，但我希望你能明白我的意思：（對不起，縮進）

@Override 
protected Scene onCreateScene() { 
    this.mMainScene = new Scene(); 
    backgroundSprite = new Sprite(0, 0, this.mBackgroundTextureRegion, getVertexBufferObjectManager()); 

    physicsWorld = new PhysicsWorld(new Vector2(0, 0), false); 

    final Player oPlayer = new Player(centerX, centerY, this.goodTiledTextureRegion, this.getVertexBufferObjectManager(), MainActivity.this, playerID, 0); 
    player_fix = PhysicsFactory.createFixtureDef(10.0f, 0.2f, 1.0f); 

    oPlayer.setBody(body); 
    playerID++; 
    players.add(oPlayer); 
    for (Player player : players) { 

     Body body = PhysicsFactory.createBoxBody(physicsWorld, oPlayer, BodyType.DynamicBody, player_fix); 
     player.setPlayers(players); 
     mMainScene.attachChild(player); 
     physicsWorld.registerPhysicsConnector(new PhysicsConnector(player, body, true, false)); 
     mMainScene.registerTouchArea(player); 
} 

this.mMainScene.registerUpdateHandler(physicsWorld); 
this.mMainScene.registerUpdateHandler(new TimerHandler(0.1f, true, new ITimerCallback() { 
    @Override 
    public void onTimePassed(final TimerHandler pTimerHandler) { 
      Player player = new Player(random, 5, goodTiledTextureRegion, getVertexBufferObjectManager(), MainActivity.this, playerID, 0); 
      Body body = PhysicsFactory.createBoxBody(physicsWorld, player, BodyType.DynamicBody, player_fix); 
      player.setBody(body); 
      players.add(player); 
      player.setPlayers(players); 
      mMainScene.attachChild(player); 

      /* This might have to be in the loop */ 
      player.body.setLinearVelocity(AccelerometerHelper.TILTX * 5, AccelerometerHelper.TILTY * 5); 
      physicsWorld.registerPhysicsConnector(new PhysicsConnector(player, body, true, false)); 
      mMainScene.registerTouchArea(player); 
     } 
    } 

return this.mMainScene; 

}