How to use

getUserData

method

in

com.jme3.effect.ParticleEmitter

private void removeUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    return;
  }
  //removing the given Track to the TrackInfo.
  data.getTracks().remove(effectTrack);
}

@Override
public void cleanUp() {
  TrackInfo t = (TrackInfo) emitter.getUserData("TrackInfo");
  t.getTracks().remove(this);
  if (t.getTracks().isEmpty()) {
    emitter.setUserData("TrackInfo", null);
  }
}

private void setUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    data = new TrackInfo();
    effectTrack.emitter.setUserData("TrackInfo", data);
  }
  //adding the given Track to the TrackInfo.
  data.addTrack(effectTrack);
}

/**
 * recursive function responsible for finding the newly cloned Emitter
 *
 * @param spat
 * @return
 */
private ParticleEmitter findEmitter(Spatial spat) {
  if (spat instanceof ParticleEmitter) {
    //spat is a PArticleEmitter
    ParticleEmitter em = (ParticleEmitter) spat;
    //getting the UserData TrackInfo so check if it should be attached to this Track
    TrackInfo t = (TrackInfo) em.getUserData("TrackInfo");
    if (t != null && t.getTracks().contains(this)) {
      return em;
    }
    return null;
  } else if (spat instanceof Node) {
    for (Spatial child : ((Node) spat).getChildren()) {
      ParticleEmitter em = findEmitter(child);
      if (em != null) {
        return em;
      }
    }
  }
  return null;
}

/**
 * Sets the Emitter to use in this track
 *
 * @param emitter
 */
public void setEmitter(ParticleEmitter emitter) {
  if (this.emitter != null) {
    TrackInfo data = (TrackInfo) emitter.getUserData("TrackInfo");
    data.getTracks().remove(this);
  }
  this.emitter = emitter;
  //saving particles per second value
  this.particlesPerSeconds = emitter.getParticlesPerSec();
  //setting the emmitter to not emmit.
  this.emitter.setParticlesPerSec(0);
  setUserData(this);
}

private void removeUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    return;
  }
  //removing the given Track to the TrackInfo.
  data.getTracks().remove(effectTrack);
}

private void removeUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    return;
  }
  //removing the given Track to the TrackInfo.
  data.getTracks().remove(effectTrack);
}

public void cleanUp() {
  TrackInfo t = (TrackInfo) emitter.getUserData("TrackInfo");
  t.getTracks().remove(this);
  if (t.getTracks().isEmpty()) {
    emitter.setUserData("TrackInfo", null);
  }
}

public void cleanUp() {
  TrackInfo t = (TrackInfo) emitter.getUserData("TrackInfo");
  t.getTracks().remove(this);
  if (t.getTracks().isEmpty()) {
    emitter.setUserData("TrackInfo", null);
  }
}

private void setUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    data = new TrackInfo();
    effectTrack.emitter.setUserData("TrackInfo", data);
  }
  //adding the given Track to the TrackInfo.
  data.addTrack(effectTrack);
}

private void setUserData(EffectTrack effectTrack) {
  //fetching the UserData TrackInfo.
  TrackInfo data = (TrackInfo) effectTrack.emitter.getUserData("TrackInfo");
  //if it does not exist, we create it and attach it to the emitter.
  if (data == null) {
    data = new TrackInfo();
    effectTrack.emitter.setUserData("TrackInfo", data);
  }
  //adding the given Track to the TrackInfo.
  data.addTrack(effectTrack);
}

/**
 * recursive function responsible for finding the newly cloned Emitter
 *
 * @param spat
 * @return
 */
private ParticleEmitter findEmitter(Spatial spat) {
  if (spat instanceof ParticleEmitter) {
    //spat is a PArticleEmitter
    ParticleEmitter em = (ParticleEmitter) spat;
    //getting the UserData TrackInfo so check if it should be attached to this Track
    TrackInfo t = (TrackInfo) em.getUserData("TrackInfo");
    if (t != null && t.getTracks().contains(this)) {
      return em;
    }
    return null;
  } else if (spat instanceof Node) {
    for (Spatial child : ((Node) spat).getChildren()) {
      ParticleEmitter em = findEmitter(child);
      if (em != null) {
        return em;
      }
    }
  }
  return null;
}

/**
 * recursive function responsible for finding the newly cloned Emitter
 *
 * @param spat
 * @return
 */
private ParticleEmitter findEmitter(Spatial spat) {
  if (spat instanceof ParticleEmitter) {
    //spat is a PArticleEmitter
    ParticleEmitter em = (ParticleEmitter) spat;
    //getting the UserData TrackInfo so check if it should be attached to this Track
    TrackInfo t = (TrackInfo) em.getUserData("TrackInfo");
    if (t != null && t.getTracks().contains(this)) {
      return em;
    }
    return null;
  } else if (spat instanceof Node) {
    for (Spatial child : ((Node) spat).getChildren()) {
      ParticleEmitter em = findEmitter(child);
      if (em != null) {
        return em;
      }
    }
  }
  return null;
}

/**
 * Sets the Emitter to use in this track
 *
 * @param emitter
 */
public void setEmitter(ParticleEmitter emitter) {
  if (this.emitter != null) {
    TrackInfo data = (TrackInfo) emitter.getUserData("TrackInfo");
    data.getTracks().remove(this);
  }
  this.emitter = emitter;
  //saving particles per second value
  this.particlesPerSeconds = emitter.getParticlesPerSec();
  //setting the emmitter to not emmit.
  this.emitter.setParticlesPerSec(0);
  setUserData(this);
}

/**
 * Sets the Emitter to use in this track
 *
 * @param emitter
 */
public void setEmitter(ParticleEmitter emitter) {
  if (this.emitter != null) {
    TrackInfo data = (TrackInfo) emitter.getUserData("TrackInfo");
    data.getTracks().remove(this);
  }
  this.emitter = emitter;
  //saving particles per second value
  this.particlesPerSeconds = emitter.getParticlesPerSec();
  //setting the emmitter to not emmit.
  this.emitter.setParticlesPerSec(0);
  setUserData(this);
}