java - Box2D Libgdx黑屏

Question

我是 Box2D 的新手。我只是想遵循一个简单的教程，但试图将它集成到我的代码中:

我开始创建我的 Libgdx 游戏:

public void create() {
   float w = Gdx.graphics.getWidth();
   float h = Gdx.graphics.getHeight();
   camera = new OrthographicCamera(w, h, 0);
   camera.position.set(camera.viewportWidth * .5f, camera.viewportHeight * .5f, 0f);
   camera.update();
   batch = new SpriteBatch();
   viewSwitcher("GameScreen",null);
  }

对 viewSwitcher 的调用，创建了一个新的对象，它创建了一个新的 Screen:

public GameScreenController(SomeGame t, String id) {
   somegame = t;
   db = t.getDB();
   world = new World(new Vector2(0, -20), true);
   screen = new GameScreen(this);
   [. . .]
 }

在 Game Screen(它扩展了 Screen 类)中我有渲染方法:

 @Override
 public void render(float delta) {
    debugRenderer.render(world, camera.combined);  
    world.step(BOX_STEP, BOX_VELOCITY_ITERATIONS, BOX_POSITION_ITERATIONS);
    stage.act(delta);
   //stage.draw();
 }

最后，一个定时器，周期性地创建新的对象。在这些对象的构造函数中，我创建了 bodyDef:

 public void createBodyLetter() {
     BodyDef bodyDef = new BodyDef();
     bodyDef.type = BodyType.DynamicBody;
     bodyDef.position.set(200, 200);
     Body body = controller.getWorld().createBody(bodyDef);

     PolygonShape dynamicBox = new PolygonShape();
     dynamicBox.setAsBox(1.0f, 1.0f);

     FixtureDef fixtureDef = new FixtureDef();
     fixtureDef.shape = dynamicBox;
     fixtureDef.density = 1.0f;
     fixtureDef.friction = 0.3f;
     body.createFixture(fixtureDef);

     dynamicBox.dispose();

}

当我启动程序时，结果只是黑屏。有谁知道问题出在哪里？

谢谢

Answer 1

将相机初始化为

camera = new OrthographicCamera(w, h);

你给出的第三个参数是菱形角度，这会给你带来问题

检查此链接上的 javadoc http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/OrthographicCamera.html#OrthographicCamera(float , float , float )