Simple quest system: from Update function to OnGUI? (javascript)

Hello all!

First time posting here :)

I've come across a simple quest system script (which can be seen here in Portuguese) to which I made some minor tweaks. However, being no programmer myself, I'm feeling way out of my league to convert the code I've got so far - which uses mostly the Update function - to an OnGUI function in order to make it more flexible for the use of the various GUI components.

The system so far uses 2 scripts that communicate to each other. Here's the first, which goes to my quest giver NPC:

 #pragma strict
 
 var questHelper : Missoes; //calls for the script Missoes.js, not the variable 
 var wizetteDistance : Vector3;
 var talk : GUIText;
 var questDesactivation : boolean;
 
 function Start () 
 {
     questDesactivation = false;
 }
 
 function Update () 
 {
     if(questDesactivation == false) 
     {
         wizetteDistance = GameObject.FindWithTag("Player").transform.position;
         wizetteDistance = wizetteDistance - transform.position;
         talk.text = "";
         if(wizetteDistance.magnitude < 2) 
         {
             talk.text = "Press Enter to accept the mission";
             if (Input.GetKeyDown(KeyCode.Return))
             {
                 questHelper = GameObject.FindWithTag("Player").AddComponent("Missoes");
                 questHelper.questText = talk;
                 questDesactivation = true;
                 
             }
         }
     }
     else if(Input.GetKeyDown(KeyCode.Escape))
     {
         questDesactivation = false;
         
     }
 }

The following script will then be added to the player:

 #pragma strict
 
 var currentObjective : int;
 var quests : String[];
 var questText : GUIText;
 var distance : float;
 var item : GameObject;
 var itemCreation : boolean;
 var itemPosition : Vector3;
 //var questName = "Retrieve the Bottle."
 
 
 function Start () 
 {
     
     currentObjective = 0;
     quests = new String[4];
     quests[0] = "Talk to the master ";
     quests[1] = "Go to the temple ";
     quests[2] = "Search for the bottle ";
     quests[3] = "Go back and deliver it to the master ";
 
 }
 
 /*
 function OnGUI () 
 {
     questWindow = GUI.Window(0, questWindow, Quest, "Quest: " + questName);
 }
 
 function Quest (windowID : int) 
 {
     GUI.DragWindow(Rect(0,0, 10000, 20));
     GUI.Label (Rect (10, 10, 300, 310), quests[currentObjective]);
     if (Input.GetKeyDown("z"))
     {
     }
 }
 */
 
 function Update () 
 {    
     questText.text = quests[currentObjective];
     if (Input.GetKeyDown("z"))
     {
         currentObjective++;
         if (currentObjective >= quests.Length)
         {
             currentObjective = 0;
         }
     }
     
     if (currentObjective == 0)
     {
         distance = Mathf.FloorToInt(Vector3.Distance(GameObject.Find("Master").transform.position, transform.position));
         questText.text += "Dis: "+ distance;
         if(distance <= 3) 
         {
             questText.text = "You must to go the temple and look for the golden vase [Press Enter to accept it].";
             if(Input.GetKeyDown(KeyCode.Return))
             {
                 currentObjective = 1;
             }
         }
     }
     if (currentObjective == 1)
     {
         distance = Mathf.FloorToInt(Vector3.Distance(GameObject.Find("MissionPoint").transform.position, transform.position));
         //distance = Mathf.FloorToInt(Vector3.Distance(GameObject.Find("MissionPoint").transform.position, transform.position / transform.lossyScale.magnitude));
         questText.text += "Dis: "+ distance;
         if(distance <= 3) 
         {
             currentObjective = 2;
             itemCreation = false;
         }
     }
     if (currentObjective == 2)
     {
         if(!itemCreation)
         {
             item = GameObject.Find("Bottle");
             if (Random.value < 0.5) 
             {
                 itemPosition = GameObject.Find("P1").transform.position;
             }
             else
             {
                 itemPosition = GameObject.Find("P2").transform.position;
             }
             item = Instantiate(item, itemPosition, item.transform.rotation);
             itemCreation = true;
         }
         else 
         {
             distance = Mathf.FloorToInt(Vector3.Distance(item.transform.position, transform.position));
             questText.text += "Dis: " + distance;
             if(distance <= 1) 
             {
                 questText.text = "Press Enter to get the bottle. ";
                 if(Input.GetKeyDown(KeyCode.Return))
                 {
                     currentObjective = 3;
                     Destroy(item);
                 }
             }
         }
     }
     if (currentObjective == 3)
     {
         distance = Mathf.FloorToInt(Vector3.Distance(GameObject.Find("Master").transform.position, transform.position));
         questText.text += "Dis: "+ distance;
         
         if(distance <= 3) 
         {
             questText.text = "Thank you for the bottle! [Press Enter to finish the quest].";
             if(Input.GetKeyDown(KeyCode.Return))
             {
                 currentObjective = 4;
                 questText.text = "";
                 Destroy(gameObject.GetComponent(Missoes));
             }
         }
     }
     if (Input.GetKeyDown(KeyCode.Escape))
     {
         questText.text = "You quit the quest! Talk to the dummie to get the quest again. ";
 yield WaitForSeconds(8); //Not working due to the constant refreshing :( 
         Destroy(gameObject.GetComponent(Missoes));
         
     }
 
 }

My biggest issue right now is the fact that for all of this to work, I need to keep the GUIText element for the communication of the 2, as far as I see it... :/ The mechanics of it are great, and fit my needs very well. I just need this all to be inside an OnGUI function rather than displayed as a GUIText.

Ideally, the visual outcome of it would be something such as seen on this tutorial, which uses somewhat the following code:

 #pragma strict
 static var activateQuest = false;
 var questWindow : Rect = Rect (((Screen.width / 2) - 100), ((Screen.height / 2) - 100), 512, 256);
 var questName = "Test";
 var questContent = "";
 var avatar = Texture;
 
 function OnGUI () 
 {
     if(activateQuest)
     {
     questWindow = GUI.DragWindow(0, questWindow, Quest, "Quest" + questName);
     }
 }
 
 function Quest (windowID : int) 
 {
     GUI.Label (Rect (10, 10, 300, 310), questContent);
     GUI.DrawTexture(Rect(a,b,c,d), avatar);
     if (GUI.Button(Rect(((questWindow.width / 2) - 50), (questWindow.height / 2) - 100), 512, 256), "Accept")
     {
         activateQuest = true;
     }
     if (GUI.Button(Rect(((questWindow.width / 2) - 30), (questWindow.height / 2) - 100), 512, 256), "Cancel")
     {
         activateQuest = false;
     }
 }
 
 function OnMouseDown () 
 {
     renderer.material.color = Color.red;
     activateQuest = true;
 }

Ugh, I hope I'm not being confusing!

This is for a game I'm creating as a graduation project in 2 weeks from now, so other than eternal gratitude, I'll also make sure to mention you in my project :)

Maaaaaaaaaaaaaaany many thanks in advance to anyone who can give me a helping hand!

• Laura