Idle in Finite State Machine

Hi, I'm trying to make a simple finite state machine for my ai and I'm having a problem to make idle state. What I want for my idle state is if my state machine is in idle, it will wait for random range from 3-5 seconds then go to another state, but the wait can be interrupt when the something trigger. I have no Idea how to make script that wait for certain number of seconds. So here is what I have so far for my state machine.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class AI : MonoBehaviour
5. {
6.     public enum State
7.     {
8.         Idle,
9.         Wander,
10.         Moving,
11.         Follow,
12.         Attack
13.     }
14.  
15.     SphereCollider sphere;
16.     NavMeshAgent agent;
17.  
18.     float walkRadius;
19.     State _state;
20.  
21.     void Awake()
22.     {
23.         sphere = GetComponent<SphereCollider> ();
24.         agent = GetComponent<NavMeshAgent> ();
25.  
26.         walkRadius = sphere.radius;
27.  
28.         _state = State.Idle;
29.         StartCoroutine ("FSM");
30.     }
31.    
32.  
33.     IEnumerator FSM()
34.     {
35.         while(true)
36.         {
37.             switch(_state)
38.             {
39.             case State.Idle:
40.                 Idle();
41.                 break;
42.  
43.             case State.Wander:
44.                 Wander();
45.                 break;
46.  
47.             case State.Moving:
48.                 Moving();
49.                 break;
50.  
51.             case State.Follow:
52.                 break;
53.  
54.             case State.Attack:
55.                 break;
56.             }
57.             yield return null;
58.         }
59.     }
60.  
61.     void Idle()
62.     {
63.         Debug.Log ("Idle");
64.         _state = State.Wander;
65.     }
66.  
67.     void Wander()
68.     {
69.         Vector3 randomDirection = Random.insideUnitSphere * walkRadius;
70.         randomDirection += transform.position;
71.  
72.         NavMeshHit hit;
73.         NavMesh.SamplePosition(randomDirection, out hit, walkRadius, 1);
74.         agent.SetDestination(hit.position);
75.  
76.         _state = State.Moving;
77.         Debug.Log ("Moving");
78.     }
79.  
80.     void Moving()
81.     {
82.         if (agent.remainingDistance <= agent.stoppingDistance)
83.         {
84.             Debug.Log("Done moving, going to idle");
85.             _state = State.Idle;
86.         }
87.     }
88.  
89.  
90. }
91.  

 

http://docs.unity3d.com/ScriptReference/WaitForSeconds.html

 

thanks, I came up with this and add a randomness to my ai but it seems the wait never works.

Code (CSharp):

1. void Idle()
2.     {
3.         Debug.Log ("Idle");
4.         StartCoroutine ("Waiting");
5.     }
6.  
7.     IEnumerator Waiting()
8.     {
9.         float wanderOrIdle = Random.Range (0, 100);
10.    
11.         if (wanderOrIdle >= 50)
12.         {
13.             yield return new WaitForSeconds (3);
14.             _state = State.Wander;
15.         }
16.         else
17.         {
18.             _state = State.Wander;
19.         }
20.  
21.         StopCoroutine ("Waiting");
22.     }

i make a 50-50 change to either wait or wander, but it always go on wonder even if the random is greater than 50

 

never mind, i solve it. the problem is the state idle is never change, so every frame called, it start a new coroutine and never wait

 

why not use built in state machne and state machine behaviours and transitions?

http://docs.unity3d.com/Manual/StateMachineBehaviours.html

 

How on earth did I miss this one? Thanks. Off to refractor.

 

i thought this is only for controlling animation, does this work with navmesh?

 

"Basically, anything that requires some kind of StateMachine logic in your game – with or without animation – can use this."
http://blogs.unity3d.com/2014/06/26/shiny-new-animation-features-in-unity-5-0/