java - 如何在libgdx中移动背景屏幕？

Question

我正在 Libgdx 中制作一个游戏，其中我想让一个球从上字落到下字，并将背景向上字移动并根据它更新相机。我的代码如下...

    public WorldRenderer(SpriteBatch spriteBatch, World world){
  this.world = world;
  this.camera = new OrthographicCamera(FRUSTUM_WIDTH, FRUSTUM_HEIGHT);
  this.camera.position.set(FRUSTUM_WIDTH/2, FRUSTUM_HEIGHT/2, 0);
  this.spriteBatch = spriteBatch;
  positionBGY1 = 0;
  positionBGY2 = 0;

 }
 public void render(World world, float deltaTime){
  if(world.ball.position.y > - camera.position.y){
    camera.position.y = world.ball.position.y;

  }

  if(camera.position.y<0)
   camera.position.y=world.ball.position.y;

  camera.update();
  spriteBatch.setProjectionMatrix(camera.combined);
  renderBackground();
  renderObjects(world, deltaTime);
 }


 private void calculateBGPosition(){
  positionBGY2 = positionBGY1 + (int)FRUSTUM_HEIGHT;
  if(camera.position.y >= positionBGY2){
   positionBGY1 = positionBGY2;
  }
 }
 private void renderBackground() {
  spriteBatch.disableBlending();
  spriteBatch.begin();
  spriteBatch.draw(Assets.gamebackgroundRegion, camera.position.x - FRUSTUM_WIDTH / 2, positionBGY1 - FRUSTUM_HEIGHT / 2, FRUSTUM_WIDTH, 1.5f * FRUSTUM_HEIGHT);
  spriteBatch.draw(Assets.gamebackgroundRegion2, camera.position.x - FRUSTUM_WIDTH / 2, positionBGY2 - FRUSTUM_HEIGHT / 2, FRUSTUM_WIDTH, 1.5f * FRUSTUM_HEIGHT);
  calculateBGPosition();
  spriteBatch.end();
  }

我的代码的问题是背景屏幕没有移动，并且相机没有随着球的移动而更新，并且球从屏幕上掉下来。

Answer 1

嗯，您需要做的第一件事是更改一个 bg 变量，因此在渲染中执行如下操作:

float speed = 1;
positionBGY1+=deltaTime*speed;
positionBGY2+=deltaTime*speed;

就相机随球移动而言，我会这样做:

camera.position.y = Math.min(ball.y,0);

我会依次忽略所有这些:

if(world.ball.position.y > - camera.position.y){
    camera.position.y = world.ball.position.y;
}

if(camera.position.y<0)
    camera.position.y=world.ball.position.y;