java Ashley ECS迭代系统未处理实体族

Question

不知何故，我无法让IteratingSystem工作。在更新过程中，我仔细检查是否存在实体，它返回的值大于0。但这意味着processEntity会被调用，但它永远不会运行

//...
import net.madmenyo.teststuff.AshleyTest.components.MovementComponent;
import net.madmenyo.teststuff.AshleyTest.components.PositionComponent;
//...

public class MovementSystem extends IteratingSystem {
    private ComponentMapper<PositionComponent> pm;
    private ComponentMapper<MovementComponent> mm;

    public MovementSystem () {
        super(Family.all(PositionComponent.class, MovementComponent.class).get());
        pm = ComponentMapper.getFor(PositionComponent.class);
        mm = ComponentMapper.getFor(MovementComponent.class);
    }

    @Override
    public void processEntity (Entity entity, float deltaTime) {
        System.out.println("Process moveSystem");
        PositionComponent position = pm.get(entity);
        MovementComponent movement = mm.get(entity);

        position.x += movement.velocityX * deltaTime;
        position.y += movement.velocityY * deltaTime;
    }

    @Override
    public void update(float deltaTime) {
        Engine engine = getEngine();

        int count = engine.getEntitiesFor(Family.all(PositionComponent.class, MovementComponent.class).get()).size();
    }
}

好的，对于更新方法中的每个计数，它应该在每次更新引擎时运行ProcessEntity。因为update被调用，所以引擎被更新，因为count > 0它应该是处理实体的，但是它从来没有被调用过。通过在运行时检查引擎，它还包含我定义的族的多个实体

Answer 1

processEntity(...)由我没有调用的父更新方法调用。容易修复一旦我再看一遍，我就把它放在这里以防万一

@Override
public void update(float deltaTime) {
    super.update(deltaTime); // <  call parent update
}