How Do you Count time in Scripting?

I want an enemy AI.

So the enemy starts of at standy.
There should be a time counter which counts some random time.
At that random time enemy should decide to or not decide to start walking.

That's one example.
The other example is if a character sets up a bomb.
Let's say he grabs a bomb and then goes put it next to an enemy building and TUrns it on. At the time he turns it on...a TIMER should start counting time( From some value down to zero or from zero up a value)
and when the TIME is up...an explosion should start.

Anyways, how do you create these kind of Timers?

 

You need to use Time.time to do what you want. Time.time increases in real world time. if you do a Debug.Log(Time.time) you will see it is going up in seconds so you can use this to do what you want.

http://docs.unity3d.com/ScriptReference/Time-time.html

If you look at nextFire = Time.time + fireRate; on Unity website, it is taking the time since the game was first started for example lets say its 15 seconds and it is adding fire rate which is 0.5f so the bullet will be fired and the next bullet will not be fired until Time.time is more than 15.5 seconds.

 

Or use your own timer variable and increment or decrement by Time.deltaTime

http://docs.unity3d.com/ScriptReference/Time-deltaTime.html

in your update function.

Code (CSharp):

1. bombTimer += Time.deltaTime;
2.  
3. if(bombTimer > detonationTime)
4.        Debug.Log("BOOM!");

 

Thank you. So if i use Time.time, is this gonna work??


public void start(){
myTime = Time.time + somerandomtime;
}

public void update(){
if STATE = WAITING{
if( myTime <= 0){
If decide to walk
STATE = WALK
//create random amount of time to keep walking
myTime = Time.time + somerandomtime;
}
else{
//count down
myTime = myTime - 1;
}
if STATE = WALK{
(if myTime <= 0)
STATE = WAITING;
//Create random amount of time to keep waiting
myTime = Time.time + somerandomtime;
else{
myTime -= 1;
}
}
}

 

Thank you so much. That sounds easy