Question

我正在尝试制作一个多敌阵列，每30秒就有一个新的子弹来自一个随机点。如果点击子弹，它应该消失，并且应该出现像爆炸一样的爆炸声。如果子弹击中球，则球弹出。因此子弹应该变为不同的精灵或纹理。与流行音乐相同。

但所有发生的事情都是子弹，如果触及弹出而没有其他事情发生。如果修改了，那么子弹会一直闪烁，因为更新太多了。

我在代码中添加了COMMENTS来解释有关问题的更多信息。

下面是代码。如果需要更多代码，我将提供。

谢谢

public class GameRenderer {

private GameWorld myWorld;
private OrthographicCamera cam;
private ShapeRenderer shapeRenderer;
private SpriteBatch batcher;

// Game Objects
private Ball ball;
private ScrollHandler scroller;
private Background background;
private Bullet bullet1;
private BulletPop bPop;

private Array<Bullet> bullets;

    // This is for the delay of the bullet coming one by one every 30 seconds.
/** The time of the last shot fired, we set it to the current time in nano when the object is first created */
double lastShot = TimeUtils.nanoTime();
  /** Convert 30 seconds into nano seconds, so 30,000 milli = 30 seconds */
 double shotFreq = TimeUtils.millisToNanos(30000);

// Game Assets
private TextureRegion bg, bPop;
private Animation bulletAnimation, ballAnimation;
private Animation ballPopAnimation;

public GameRenderer(GameWorld world) {
    myWorld = world;
    cam = new OrthographicCamera();
    cam.setToOrtho(true, 480, 320);

    batcher = new SpriteBatch();
    // Attach batcher to camera
    batcher.setProjectionMatrix(cam.combined);

    shapeRenderer = new ShapeRenderer();
    shapeRenderer.setProjectionMatrix(cam.combined);

            // This is suppose to produce 10 bullets at random places on the background.
    bullets = new Array<Bullet>();
    Bullet bullet = null;
    float bulletX = 00.0f;
    float bulletY = 00.0f;
    for (int i = 0; i < 10; i++) {
        bulletX = MathUtils.random(-10, 10);
        bulletY = MathUtils.random(-10, 10);
        bullet = new Bullet(bulletX, bulletY);

        AssetLoader.bullet1.flip(true, false);
        AssetLoader.bullet2.flip(true, false);

        bullets.add(bullet);
    }

    // Call helper methods to initialize instance variables
    initGameObjects();
    initAssets();
}

private void initGameObjects() {
    ball = GameWorld.getBall();
    bullet1 = myWorld.getBullet1();
    bPop = myWorld.getBulletPop();
    scroller = myWorld.getScroller();
}

private void initAssets() {
    bg = AssetLoader.bg;
    ballAnimation = AssetLoader.ballAnimation;
    bullet1Animation = AssetLoader.bullet1Animation;
    ballPopAnimation = AssetLoader.ballPopAnimation;
}

    // This is to take the bullet away when clicked or touched.
public void onClick() {
    for (int i = 0; i < bullets.size; i++) {
        if (bullets.get(i).getBounds().contains(0, 0))
            bullets.removeIndex(i);
    }
}

private void drawBackground() {
    batcher.draw(bg1, background.getX(), background.getY(), background.getWidth(), backgroundMove.getHeight());
}

public void render(float runTime) {

    Gdx.gl.glClearColor(0, 0, 0, 1);
    Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT);

    batcher.begin();
    // Disable transparency 
    // This is good for performance when drawing images that do not require
    // transparency.
    batcher.disableBlending();

    drawBackground();

    batcher.enableBlending();

            // when the bullet hits the ball, it should be disposed or taken away and a ball pop sprite/texture should be put in its place
    if (bullet1.collides(ball)) {
                    // draws the bPop texture but the bullet does not go just keeps going around, and the bPop texture goes.
        batcher.draw(AssetLoader.bPop, 195, 273);
    }

    batcher.draw(AssetLoader.ballAnimation.getKeyFrame(runTime), ball.getX(), ball.getY(), ball.getWidth(), ball.getHeight());

           // this is where i am trying to make the bullets come one by one, and if removed via the onClick() then bPop animation 
           // should play but does not???
    if(TimeUtils.nanoTime() - lastShot > shotFreq){
         // Create your stuff
        for (int i = 0; i < bullets.size; i++) {
            bullets.get(i);
            batcher.draw(AssetLoader.bullet1Animation.getKeyFrame(runTime), bullet1.getX(), bullet1.getY(), bullet1.getOriginX(), bullet1.getOriginY(), bullet1.getWidth(), bullet1.getHeight(), 1.0f, 1.0f, bullet1.getRotation());
            if (bullets.removeValue(bullet1, false)) {
                batcher.draw(AssetLoader.ballPopAnimation.getKeyFrame(runTime), bPop1.getX(), bPop1.getY(), bPop1.getWidth(), bPop1.getHeight());
            }
        }
         /* Very important to set the last shot to now, or it will mess up and go full auto */
         lastShot = TimeUtils.nanoTime();
      }

    // End SpriteBatch
    batcher.end();
}
}

谢谢

Answer 1

嗯......你为什么要从if里面添加新子弹来绘制图形？这样你所绘制的每30秒只会淹没一帧。在if内，您应该只添加/删除对象并将它们全部绘制到外面。 if内没有绘图！

Answer 2

除了MilanG的回答

the bullets.get（i）; line什么也没做。你想把返回的Bullet存储到一个变量中，你似乎创建了bullet1 var。

此外，在循环播放数组时，您确实不应该添加元素或从数组中删除元素。考虑使用第二个数组来添加/删除元素，并使用它来改变主数组或使用迭代器。

[编辑] 在这种特殊情况下，你也可以这样做，虽然它只适用于每次点击一个子弹

int index = -1;
for (int i = 0; i < bullets.size; i++) {
    if (bullets.get(i).getBounds().contains(0, 0)) {
        index = i;
        break;
    }
}
if(index > -1) bullets.removeIndex(index);

您的.contains（）似乎也应该通过点击的位置而不是0,0？

LibGDX中的多个敌人数组

2 个答案: