efficient sequencer

Hi I'm trying to find a better way to sequence functions in script.
essentially I have my mainCharacter going across the screen when he triggers the scene end the scene is de-activated and the next scene becomes active. (also the mainCharacter resets to the beginning) It requires me to have a list of if statements. How would I do this in a better way? Arrays? enums maybe? Or should I use events? Thanks for your input.

if (mainCharacter.transform.position.x > scene.end) {sceneNum = sceneNum +1;}

if (sceneNum == 1) scene.one.SetActive(true); else scene.one.SetActive(false);
if (sceneNum == 2) scene.two.SetActive(true); else scene.two.SetActive(false);
if (sceneNum == 3) scene.three.SetActive(true); else scene.three.SetActive(false);
if (sceneNum == 4) scene.four.SetActive(true); else scene.four.SetActive(false);
if (sceneNum == 5) scene.five.SetActive(true); else scene.five.SetActive(false);

 

Maybe a switch statement is what you're looking for?

http://unity3d.com/learn/tutorials/modules/beginner/scripting/switch

 

Or just put your scenes into array and use code like this:

Code (csharp):

1.  
2. for (int i = 0; i < scenes.Length; i++) {
3.   scenes[i].SetActive(i == sceneNum);
4. }
5.  

 

Ah, I got it to work. Thats the pro solution I was looking for. Thanks mholub!

 

I wonder if there is a way to sequence like this for functions too?

 

What do you mean? To call a function stored inside collection?

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections.Generic;
4. using System;
5.  
6. public class SequencedFunctionCaller : MonoBehaviour {
7.     private List<Action> actions = new List<Action>(); // Action is a callable type without arguments
8.     // Use this for initialization
9.     void Start () {
10.         actions.Add(() => Debug.Log("hello world")); // lambda function
11.         actions.Add(someFunction);
12.  
13.         actions[1](); // calls someFunction
14.         call (1); // same
15.     }
16.  
17.     void someFunction() {
18.         Debug.Log("some function");
19.     }
20.  
21.     void call(int i) {
22.         actions[i]();
23.     }
24.  
25.     // Update is called once per frame
26.     void Update () {
27.  
28.     }
29. }
30.  
31.  

https://msdn.microsoft.com/en-us/library/system.action(v=vs.110).aspx

And please look at UnityEvent:
http://docs.unity3d.com/ScriptReference/Events.UnityEvent.html

It can be added as public field into MonoBehaviour and it has nice GUI. You can store UnityEvents into List too. And invoke them with event.Invoke() call;

 

A switch may be the better choice here as I need to add custom functions everytime the scene changes. I want to figure out how events work but I'm using js and the docs and examples are fairly confusing or just broken.
Perhaps next project I'll switch to C#. I'm still just a 6 months noob at scripting.

 

It's same in UnityScript.

Code (csharp):

1.  
2. #pragma strict
3.  
4. import UnityEngine.Events;
5.  
6. var events : UnityEvent[];
7.  
8. // this code will invoke all events on Start which you can specify by Inspector
9. // just put the component on some gameobject and add some events
10. function Start () {
11.     for (var i = 0; i < events.Length; i++) {
12.         events[i].Invoke();
13.     }
14. }
15.  
16.  

 

Oh wow, this is amazing! Thank You. This would have saved me so much trouble if I knew of it months ago.

 

One last thing, Let say the main character.position.x is greater than scene.position.x. When its true i invoke an event. I check for this in an if statement in update. When it becomes true it sends and event just once until it resets. Whats the best way to do this? I keep reading to use co-routine but haven't found an example of how it would work.

 

I usually use just simple boolean flag for such task.

Code (csharp):

1.  
2. #pragma strict
3.  
4. import UnityEngine.Events;
5.  
6. var Character : Transform;
7. var Scene : Transform;
8.  
9. var OnPositionEvent : UnityEvent;
10.  
11. private var eventFired : boolean;
12.  
13. function Start () {
14. }
15.  
16. function Update () {
17.     if (!eventFired && Character.position.x > Scene.position.x) {
18.         OnPositionEvent.Invoke();
19.         eventFired = true;
20.     }
21. }
22.  
23. function Reset() {
24.     eventFired = false;
25. }
26.  
27. function OnGUI() {
28.   if (GUILayout.Button("Reset")) {
29.     Reset();
30.   }
31. }
32.  

I don't know how to use coroutine for this. If you can point me into some link you read about it I will be thankful.

 

I just googled "call function once from update" there are a lot of postings but a boolean flag seems to be the only way. Others keep saying to use co-routine without giving an example. There must be a simpler and more elegant way to do this. I guess this isn't terrible.

 

I would love to know anymore useful programming tricks mholub. Thanks!