Traffic Light Script

Hello! I'm new on this forum.
I wanted to ask you how can I create a script for a traffic light on my roller coasters.

Thank You!
Bye.

Welcome! Our members can help you do that.

Not to be rude but this is the theme park news and construction section of the forum!

Ops...excuse me.
But...How i can create a Traffic Light on a roller coaster???

[herman116]

If you want to make a traffic light, you should create a traffic light 3D model, after it's created you'll have to attach lights to it in the NoLimits editor and then you'll have to make a script that will switch the lights on or off.

[TTD03]

Moved to NoLimits 2 Scripting forum.

Ok. Thank You.
My problem is: how can I create a script???

I need a tutorial to create a traffic light script

[herman116]

If you allready have a 3D model and have the lights configured in NoLimits, it's actually pretty easy. Below is a small script which I made to turn on the lights of my coaster The Big Race. I made it a bit simpler so it's easier to understand but if you're not having any problems understanding this, maybe you could take a look at the original script.

Code: Select all

public class LightScript
{
   private SceneObjectLight redLight;
   private SceneObjectLight yellowLight;
   private SceneObjectLight greenLight;
   
   public void Init(Simulator sim)
   {
      SceneObject light = sim.getSceneObject("Light");
      redLight = light.getLightForName("red");
      yellowLight = light.getLightForName("yellow");
      greenLight = light.getLightForName("green");
   }
   
   public void Red()
   {
      redLight.setEnabled(true);
   }
   
   public void Yellow()
   {
      redLight.setEnabled(false);
      yellowLight.setEnabled(on);
   }
   
   public void Green()
   {
      yellowLight.setEnabled(false);
      greenLight.setEnabled(on);
   }
   
   public void Off()
   {
      greenLight.setEnabled(false);
   }
}


In the init method, it will search for an object called "light". In this object, it searches for three lights called "red", "yellow" and "green".

When the function Red() is called, the red light will go on.
When the function Yellow() is called, the red light will go off and the yellow light will go on.
When the function Green() is called, the yellow light will go off and the green light will go on.
When the function Off() is called, the green light will go off.

You'll have to make something that will trigger the functions in the right time though. At my coaster I called the Red() function when the car arrived at the launch section, the Yellow() function when the car went backward a small bit and the green light when the coaster launched. The Off() function was called a second after the launch was started.

Thank you very Much!!!

[herman116]

You're welcome!

Help me!!!!! I've an another problem!!!
How can i set up the lights and the script on they in the traffic light mode??????

^ Herman just above you, will help you again! Thanks for posting!

[herman116]

Do you want to run them in a cycle? Or on a specific moment like a launch? If you want them to change on a specific moment, when should it be green, yellow and red?

I want run them in a specific moment (as the launch).

And... How can i set the lights in the traffic light model?

[herman116]

This can become quite complicated if you don't have much experience with scripting. The script below will change the traffic light from green, to yellow, to red and back to green again, to yellow again etc.. This will be done every 2000 milliseconds (2 seconds) this time can be changed in the top of the script. The function onNextFrame() should be called every frame. Most object scripts need this function so that it can update itself.

In the onNextFrame() function, the program will look in which state it currently is (green, red or yellow) and will call the functions from the traffic light script. The function will also call the wait() function which will check if the time is over to switch to another light. It will save the current time in its first call and will check every frame if the saved time + the time it should wait is bigger than the now current time.

Code: Select all

private static final double TimeRed = 2000;
private static final double TimeYellow = 2000;
private static final double TimeGreen = 2000;

private static final int STATE_GREEN = 0;
private static final int STATE_YELLOW= 1;
private static final int STATE_RED = 2;

private double TimeStartDelay = 0;

private byte state = STATE_GREEN;

// Put the traffic light code in here

public void onNextFrame(float tick)
{
  switch (state)
  {
    case STATE_GREEN:
      Green();
      if (wait(TimeGreen))
      {
        state = STATE_YELLOW;
      }
      break;

    case STATE_YELLOW:
      Yellow();
      if (wait(TimeYellow))
      {
        state = STATE_Red;
      }
      break;

    case STATE_Red:
      Red();
      if (wait(TimeRed))
      {
        state = STATE_Green;
      }
      break;
  }
}

private bool wait(double time)
{
  if (TimeStartDelay == 0) {
    TimeStartDelay = System.currentTimeMillis();
  }
  if (TimeStartDelay + time < System.currentTimeMillis()) {
    TimeStartDelay = 0;
    return true;
  }
  return false;
}


The easiest way to add a track trigger for you light is by looking into the door script. This shows how the door looks up the track 5 meters in front of the object and checks if it sees a train. I've copied the most important parts down here.

Code: Select all

  private TrackTrigger beforeDoorTrigger;
  private TrackTrigger behindDoorTrigger;
 
  private static final String scriptName = "DoorScript";
 
  public bool onInit()
  {
    sco = sim.getSceneObjectForEntityId(getParentEntityId());
    if (sco == null)
    {
      System.err.println(scriptName + ": the script is not part of a scene object");
      return false;
    }

    Vector3f pos = new Vector3f();

    sco.getTranslation(pos);

    final float range = 10;

    // create triggers...
    TrackPos trackPos = sim.findNearestCoasterTrack(pos, range);
    if (trackPos == null)
    {
      System.err.println(scriptName + ": no coaster found within a range of "+ range + " meters");
      return false;
    }
    else
    {
      Coaster coaster = trackPos.getCoaster();
     
      System.out.println(scriptName + ": Coaster found: " + coaster);

      System.out.println("Coaster Style is: " + coaster.getCoasterStyleId());
     
      // create a trigger 5 meters in front of the track pos
      beforeDoorTrigger = TrackTrigger.createTrackTriggerAtOffset(trackPos, -5.0);
     
      // create a trigger 5 meters after the track pos
      behindDoorTrigger = TrackTrigger.createTrackTriggerAtOffset(trackPos, +5.0);
     
      // tell the triggers that they should call our onTrainEntering/onTrainLeaving methods
      // We have to implement the TrackTriggerListener interface
      beforeDoorTrigger.addTrackTriggerListener(this);
      behindDoorTrigger.addTrackTriggerListener(this);
    }

    return true;
  }

  /**
   * This method is part of the TrackTriggerListener Interface implementation
   *
   * It will be called if the interface is registered for a trigger using the
   * addTrackTriggerListener method.
   */
  public void onTrainEntering(TrackTrigger trigger, Train train)
  {
    if (trigger == beforeDoorTrigger)
    {
      //train is seen before the door
    }
    else if (trigger == behindDoorTrigger)
    {
      //train is seen behind the door
    }
  }


When it sees the train, you could change the trafficlight state to STATE_GREEN and let it run the cycle once.

^ Thanks for making impressive and informative posts, always!