CODEWITHSUNDEEP
c#unity-game-engine
muttley91
muttley91

Reputation: 12684

Boss Battle State Machine in Unity

I'm trying to build a boss enemy using a simple state machine for his different behaviours. I'm trying to build an Attacking and Waiting state as it is, but I'm running into some issues.

How can I make the states switch automatically? Ideally, I'd like the boss to be attacking for a specified amount of time, then waiting (at which time he is vulnerable) for another amount of time. But the waiting is the issue I'm running into. Is there a good way to go about this?

EDIT: The State machine I'm writing currently looks like this:

public class BossStateMachine : MonoBehaviour
{

    /* TODO: Figure out WAITING for state changes */

    private delegate void State(); //create delegate
    private State stateMethod; //create holder for delegate

    bool canBeAttacked = false;
    public int bossHealth = 5; //takes 5 hits

    /*
     * States:
     * Attacking - boss is attacking, is not vulnerable
     * Waiting - boss is not attacking, is vulnerable
     */

    // Use this for initialization
    void Start ()
    {
        stateMethod = new State(EnterStateAttacking);
    }

    // Update is called once per frame
    void Update ()
    {

    }

    void FixedUpdate()
    {
        stateMethod();
    }

    private void EnterStateAttacking()
    {
        canBeAttacked=false;
        stateMethod = new State(Attacking);
        stateMethod(); //start in same frame (comment out to delay)
    }

    private void Attacking()
    {
        FireBlast(); //method of attack
    }

    private void EnterStateWaiting()
    {
        canBeAttacked=true;
        stateMethod = new State(Waiting);
        stateMethod();
    }

    private void Waiting()
    {
        //wait (open to attack from player)
        //do laughing or something
    }
}

I'd like to have both the Waiting state and the Attacking state enter and exit on their own. Even through the update function, how can I do this?

Upvotes: 0

Views: 4936

Answers (1)

Simon Whitehead
Simon Whitehead

Reputation: 65087

In it's simplest form, you could have it switch backwards and forwards between states.. something like this:

private TimeSpan timeToWait = TimeSpan.FromMilliseconds(5000); // 5 seconds
private TimeSpan lastStateCheck;

public void Update(GameTime gameTime) {
    if (lastStateCheck + timeToWait < gameTime.TotalGameTime) {
        // switch states after 5 seconds..
        /* Switch state code here */
        lastStateCheck = gameTime.TotalGameTime;
    }
}

A more advanced AI would perform a lot more checks, such as whether the player has been seen, or whether it should continue to attack if the player is directly in front of it.

PS: I didn't vote to close (thought I should mention that)

Upvotes: 1

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