Question

我正在开发太空船游戏。

我有一个EnemyFactory类用这个方法创建敌人：

   public void createPattern(String patternJson, final String enemyJson, final Vector2 position) {
    System.out.println(TAG + "- Entering pattern creation..");
    Json json = new Json();
    final ObjectMap objectMap = json.fromJson(ObjectMap.class, Gdx.files.internal(patternJson));

    new Thread(new Runnable() {
        @Override
        public void run() {
            float count = Float.parseFloat(objectMap.get("count").toString());
            float interval = Float.parseFloat(objectMap.get("interval").toString());
            float intervalDelta = 0;

            System.out.println(TAG + "- Running thread..");

            for(int i = 0; i < count; i++) {
                do{
                    intervalDelta += Gdx.graphics.getDeltaTime();
                    System.out.println(TAG + "- interval => " + intervalDelta);
                }while(intervalDelta < interval);

                Gdx.app.postRunnable(new Runnable() {
                    @Override
                    public void run() {
                        System.out.println(TAG + "- creating enemy ship..");
                        createEnemy(enemyJson, position);
                    }
                });

                intervalDelta = 0;
            }
        }
    }).start();
}

这个想法是在一个时间间隔（0.5秒）内创建5个敌人，但是当我运行应用程序时，它会运行for循环5次，然后创建5个敌人但没有时间间隔。

有什么建议吗？

编辑：

我做了另一个版本的功能：

    public void createPattern(String patternJson, final String enemyJson, final Vector2 position) {
    System.out.println(TAG + "- Entering pattern creation..");
    Json json = new Json();
    final ObjectMap objectMap = json.fromJson(ObjectMap.class, Gdx.files.internal(patternJson));
    float count = Float.parseFloat(objectMap.get("count").toString());
    float interval = Float.parseFloat(objectMap.get("interval").toString());
    float intervalDelta = 0;

    Timer timer = Timer.instance();
    timer.scheduleTask(new Timer.Task() {
        @Override
        public void run() {
            createEnemy(enemyJson, position);
        }
    },0,interval,(int) count);
}

这就是发生的事情，仍然不是理想的行为：

test

Answer 1

这是您的任务代码。

注意 TimeUnit 类，对延迟任务非常有用。

public class ScheduledExecution {

    public void createEnemyByPattern() {

        EnemyActivator factory = new EnemyActivator(5, 500);

        new Thread(factory).start();

    }

}

class EnemyActivator implements Runnable {

    private final int enemyCount;
    private final long creationDelay;

    EnemyActivator(int enemyCount, long creationDelay) {
        this.enemyCount = enemyCount;
        this.creationDelay = creationDelay;
    }

    @Override
    public void run() {

        for(int i=0; i<enemyCount; ++i) {
            activateEnemy();
            try {
                TimeUnit.MILLISECONDS.sleep(creationDelay);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    private void activateEnemy() {
        // create and send enemy code here
    }


}

Answer 2

从您提供的代码中无法分辨出错误 - 它可能是代码之外的内容。但是，遵循良好的游戏编程习惯，我建议您使用以下内容：

public class MyGameClass <extends Game|implements ApplicationListener|whatever> {
  // ...
  float totalDelta=0;
  float mechanicsDelta= // your interval here
  float shipCount=0, totalShips= // count goes here
  public void render(){
    totalDelta+=Gdx.graphics.getDeltaTime();
    int mechanicsFrames=0;
    while(totalDelta>mechanicsDelta){
      if(shipCount<totalShips){
        // spawn ship
        shipCount++;
      }
      // more game mechanics here
      if(mechanicsFrames>4){
        System.out.println("Warning: FPS is too low! Skipping frames...");
        // on a normal system this shouldn't happen
        // but in case it does we can't have your game freeze
        // insert some graceful error out here
        break;
      }
      mechanicsFrames++;
    }
    // render here
  }

  // ...
}

同时考虑将Pool<...>用于敌舰，因为实例化/垃圾收集对象很慢。

无法在Libgdx中创建具有间隔的对象

2 个答案: