Examples of com.badlogic.ashley.core.Engine.update()

com.badlogic.ashley.core.Engine.update()
Updates all the systems in this Engine. @param deltaTime The time passed since the last frame.

    engine.update(deltaTime);


    //When entity has OrderComponent, ComponentB and ComponentC
    e.add(new ComponentC());
    system.expectedNames.addLast("A");
    engine.update(deltaTime);


    //When entity has ComponentB and ComponentC
    e.remove(OrderComponent.class);
    e.add(new ComponentC());
    engine.update(deltaTime);

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    engine.update(deltaTime);


    //When entity has ComponentB and ComponentC
    e.remove(OrderComponent.class);
    e.add(new ComponentC());
    engine.update(deltaTime);
  }
  
  @Test
  public void entityRemovalWhileIterating(){
    Engine engine = new Engine();

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      e.add(in);
      
      engine.addEntity(e);
    }
    
    engine.update(deltaTime);
    
    assertEquals(numEntities / 2, entities.size());
    
    for (int i = 0; i < entities.size(); ++i) {
      Entity e = entities.get(i);

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      e.add(in);
      
      engine.addEntity(e);
    }
    
    engine.update(deltaTime);
    
    assertEquals(numEntities / 2, entities.size());
    
    for (int i = 0; i < entities.size(); ++i) {
      Entity e = entities.get(i);

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    engine.addEntity(b);
    engine.addEntity(c);
    system.expectedNames.addLast("A");
    system.expectedNames.addLast("B");
    system.expectedNames.addLast("C");
    engine.update(0);
    
    engine.addEntity(d);
    system.expectedNames.addLast("A");
    system.expectedNames.addLast("B");
    system.expectedNames.addLast("D");

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    engine.addEntity(d);
    system.expectedNames.addLast("A");
    system.expectedNames.addLast("B");
    system.expectedNames.addLast("D");
    system.expectedNames.addLast("C");
    engine.update(0);
    
    orderMapper.get(a).zLayer = 3;
    orderMapper.get(b).zLayer = 2;
    orderMapper.get(c).zLayer = 1;
    orderMapper.get(d).zLayer = 0;

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    system.forceSort();
    system.expectedNames.addLast("D");
    system.expectedNames.addLast("C");
    system.expectedNames.addLast("B");
    system.expectedNames.addLast("A");
    engine.update(0);
  }
  
  private static class OrderComparator implements Comparator<Entity> {


    @Override

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        IntervalSystemSpy intervalSystemSpy = new IntervalSystemSpy();
        
        engine.addSystem(intervalSystemSpy);


        for (int i = 1; i <= 10; ++i) {
          engine.update(deltaTime);
          assertEquals(i / 2, intervalSystemSpy.numUpdates);
        }
    }
}

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