Unity Voeg vijanden toe aan een 2D-platformgame

Het maken van een platformgame in Unity is relatief eenvoudig, maar het toevoegen van functionele vijanden is misschien niet zo eenvoudig.

In dit bericht laat ik zien hoe je een 2D-platformgame maakt met een vijandelijke AI.

Over het algemeen kan de speler in 2D-platformgames alleen voor/achter lopen, springen en in sommige gevallen de ladder op/af klimmen, als de kaart uit meerdere niveaus bestaat. Wetende dat we een modulaire aanpak zouden kunnen gebruiken waarbij dezelfde controller wordt gedeeld tussen de speler en de AI.

Stap 1: Maak de scripts

Laten we beginnen met het maken van alle benodigde scripts. Controleer de broncode hieronder:

Ladder2D.cs

//Copyright @2018 sharpcoderblog.com
//You are free to use this script in free or commercial projects
//Selling the source code of this script is not allowed

using UnityEngine;

public class Ladder2D : MonoBehaviour
{
    Collider2D ladderCollider;
    [HideInInspector]
    public Vector3 boundsCenter;

    void Start()
    {
        //t = transform;
        ladderCollider = GetComponent<Collider2D>();
        if (ladderCollider)
        {
            ladderCollider.isTrigger = true;
            ladderCollider.gameObject.layer = 2; //Set ladder collider layer to IgnoreRaycast
        }
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Player"))
        {
            if (ladderCollider)
            {
                boundsCenter = ladderCollider.bounds.center;
            }
            other.SendMessage("AssignLadder", this, SendMessageOptions.DontRequireReceiver);
        }
    }

    void OnTriggerExit2D(Collider2D other)
    {
        if (other.CompareTag("Player"))
        {
            other.SendMessage("RemoveLadder", this, SendMessageOptions.DontRequireReceiver);
        }
    }
}

SpelerController2D.cs

//Copyright @2018 sharpcoderblog.com
//You are free to use this script in free or commercial projects
//Selling the source code of this script is not allowed

using System.Collections.Generic;
using UnityEngine;

public class PlayerController2D : MonoBehaviour
{
    //Move player in 2D space
    public float maxSpeed = 2.57f;
    public float jumpHeight = 6.47f;
    public float playerHP = 100;

    [HideInInspector]
    public bool facingRight = true;
    [HideInInspector]
    public float moveDirection = 0;
    [HideInInspector]
    public Rigidbody2D r2d;
    [HideInInspector]
    public Collider2D mainCollider;
    [HideInInspector]
    public Vector2 playerDimensions;
    [HideInInspector]
    public bool isGrounded = false;
    //Check every collider except Player and Ignore Raycast
    LayerMask layerMask = ~(1 << 2 | 1 << 8); //Make sure our player has Layer 8

    [HideInInspector]
    public Ladder2D currentLadder;
    List<Ladder2D> allLadders = new List<Ladder2D>();
    float moveDirectionY = 0;
    float distanceFromLadder;
    [HideInInspector]
    public bool isAttachedToLadder = false;
    bool ladderGoingDown = false;
    //bool isMovingOnLadder = false;
    [HideInInspector]
    public bool canGoDownOnLadder = false;
    [HideInInspector]
    public bool canClimbLadder = false;

    //Bot movement directions
    [HideInInspector]
    public bool isBot = false;
    [HideInInspector]
    public float botMovement = 0;
    [HideInInspector]
    public float botVerticalMovement = 0;
    [HideInInspector]
    public bool botJump = false;
    [HideInInspector]
    public Transform t;
    [HideInInspector]
    public int selectedWeaponTmp = 0;

    float gravityScale;

    // Use this for initialization
    void Start()
    {
        r2d = GetComponent<Rigidbody2D>();
        r2d.freezeRotation = true;
        mainCollider = GetComponent<Collider2D>();
        t = transform;

        gravityScale = r2d.gravityScale;
        selectedWeaponTmp = -100;

        facingRight = t.localScale.x > 0;

        //sr = GetComponent<SpriteRenderer>();
        playerDimensions = BotController2D.ColliderDimensions(GetComponent<Collider2D>());
    }

    void OnDisable()
    {
        r2d.bodyType = RigidbodyType2D.Static;
        r2d.velocity = Vector3.zero;
    }

    // Update is called once per frame
    void Update()
    {
        if (!isBot)
        {
            if ((Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.D)) &&
                (isGrounded || r2d.velocity.x > 0.01f || isAttachedToLadder))
            {
                moveDirection = Input.GetKey(KeyCode.A) ? -1 : 1;
            }
            else
            {
                if (isGrounded || r2d.velocity.magnitude < 0.01f)
                    moveDirection = 0;
            }
        }
        else
        {
            if (botMovement != 0 && (isGrounded || r2d.velocity.x > 0.01f))
            {
                moveDirection = botMovement < 0 ? -1 : 1;
            }
            else
            {
                if (isGrounded || r2d.velocity.magnitude < 0.01f)
                    moveDirection = 0;
            }
        }

        //Change facing position
        if (moveDirection != 0)
        {
            if (moveDirection > 0 && !facingRight)
            {
                facingRight = true;
            }
            if (moveDirection < 0 && facingRight)
            {
                facingRight = false;
            }
        }

        if (facingRight)
        {
            if (t.localScale.x < 0)
            {
                t.localScale = new Vector3(Mathf.Abs(t.localScale.x), t.localScale.y, transform.localScale.z);
            }
        }
        else
        {
            if (t.localScale.x > 0)
            {
                t.localScale = new Vector3(-Mathf.Abs(t.localScale.x), t.localScale.y, t.localScale.z);
            }
        }

        //Vector2 velocityTmp = r2d.velocity;
        bool canGoDownTmp = false;

        // LADDER CONTROL START
        if (currentLadder)
        {
            distanceFromLadder = Mathf.Abs(currentLadder.boundsCenter.x - t.position.x);
            canClimbLadder = distanceFromLadder < 0.34f;
            if (!isAttachedToLadder)
            {
                if (canClimbLadder)
                {
                    if (currentLadder.boundsCenter.y > t.position.y)
                    {
                        if (!isBot)
                        {
                            if (Input.GetKey(KeyCode.W))
                            {
                                isAttachedToLadder = true;
                            }
                        }
                        else
                        {
                            if (botVerticalMovement > 0)
                            {
                                isAttachedToLadder = true;
                            }
                        }
                    }
                    if (currentLadder.boundsCenter.y < t.position.y)
                    {
                        if (!isBot)
                        {
                            if (Input.GetKey(KeyCode.S))
                            {
                                isAttachedToLadder = true;
                            }
                        }
                        else
                        {
                            if (botVerticalMovement < 0)
                            {
                                isAttachedToLadder = true;
                            }
                        }

                        canGoDownTmp = true;
                    }
                }

                if (isAttachedToLadder)
                {
                    r2d.gravityScale = 0;
                    moveDirection = 0;
                    moveDirectionY = 0;
                }
            }
            else
            {
                //Make our collider trigger if we stand on top of the ladder (To prevent collision with the ground while going down)
                mainCollider.isTrigger = currentLadder.boundsCenter.y < t.position.y; 

                //Ladder movement
                if ((!isBot && Input.GetKey(KeyCode.W)) || (isBot && botVerticalMovement > 0))
                {
                    moveDirectionY = 3.97f;
                    ladderGoingDown = false;
                    //For sound controller
                    //isMovingOnLadder = true;
                }
                else if ((!isBot && Input.GetKey(KeyCode.S)) || (isBot && botVerticalMovement < 0))
                {
                    moveDirectionY = -3.97f;
                    ladderGoingDown = true;
                    if (!mainCollider.isTrigger && isGrounded)
                    {
                        //RemoveLadder(currentLadder);
                        isAttachedToLadder = false;
                        mainCollider.isTrigger = false;
                        r2d.gravityScale = gravityScale;
                        moveDirectionY = 0;
                    }
                    //For sound controller
                    //isMovingOnLadder = true;
                }
                else
                {
                    //isMovingOnLadder = false;
                    moveDirectionY = 0;
                }
            }

            if (distanceFromLadder > playerDimensions.x * 2)
            {
                RemoveLadder(currentLadder);
            }
        }
        canGoDownOnLadder = canGoDownTmp;
        // LADDER CONTROL END

        if (!isBot)
        {
            //Jumping
            if (Input.GetKeyDown(KeyCode.W))
            {
                Jump();
            }
        }
        else
        {
            if (botJump)
            {
                botJump = false;
                Jump();
            }
        }

        if (!isBot)
        {
            //Weapon firing
            if (Input.GetKeyDown(KeyCode.LeftControl))
            {
                Attack();
            }
        }
    }

    void FixedUpdate()
    {
        Bounds colliderBounds = mainCollider.bounds;
        Vector3 groundCheckPos = colliderBounds.min + new Vector3(colliderBounds.size.x * 0.5f, 0.1f, 0);
        //Check if player is grounded
        isGrounded = Physics2D.OverlapCircle(groundCheckPos, 0.25f, layerMask);

        Debug.DrawLine(groundCheckPos, groundCheckPos - new Vector3(0, 0.25f, 0), isGrounded ? Color.green : Color.red);

        //Apply player velocity
        r2d.velocity = new Vector2((moveDirection) * maxSpeed, isAttachedToLadder ? moveDirectionY : r2d.velocity.y);
    }

    void AssignLadder(Ladder2D ladderTmp)
    {
        currentLadder = ladderTmp;
        allLadders.Add(ladderTmp);
    }

    void RemoveLadder(Ladder2D ladderTmp)
    {
        //print("On trigger out");
        allLadders.Remove(ladderTmp);
        if (currentLadder == ladderTmp)
        {
            currentLadder = null;

            if (allLadders.Count > 0)
            {
                currentLadder = allLadders[allLadders.Count - 1];
            }
        }

        if (isAttachedToLadder && !currentLadder)
        {
            isAttachedToLadder = false;
            //r2d.bodyType = RigidbodyType2D.Dynamic;
            mainCollider.isTrigger = false;

            r2d.gravityScale = gravityScale;
            r2d.velocity = Vector3.zero;

            if (!ladderGoingDown)
            {
                r2d.velocity = new Vector2(r2d.velocity.x, 1.47f);
            }
            ladderGoingDown = false;
        }
    }

    public void Jump()
    {
        if (isGrounded && !isAttachedToLadder)
        {
            r2d.velocity = new Vector2(r2d.velocity.x, jumpHeight);
            //Tip: Play jump sound here
        }
    }

    public void Attack()
    {
        print(gameObject.name + " is Attacking");

        //Tip: Write your attack function here (ex. Raycast toward the enemy to inflict the damage)
    }
}

CameraFollow2D.cs

//Copyright @2018 sharpcoderblog.com
//You are free to use this script in free or commercial projects
//Selling the source code of this script is not allowed

using UnityEngine;

public class CameraFollow2D : MonoBehaviour
{
    public Transform target;
    public Vector3 offset = new Vector3(0, 2.8f, 0);
    public bool smoothFollow = true;

    Vector2 moveToPos;
    bool beginMove = false;
    float distanceTmp = 0f;

    // Update is called once per frame
    void LateUpdate()
    {
        if (!target)
            return;

        if (smoothFollow)
        {
            distanceTmp = ((target.position + offset) - transform.position).sqrMagnitude;
            if (beginMove)
            {
                moveToPos = Vector3.Lerp(moveToPos, target.position + offset, Time.fixedDeltaTime * 7.75f);
                transform.position = new Vector3(moveToPos.x, moveToPos.y, -10);

                if (distanceTmp < 0.05f * 0.05f)
                {
                    beginMove = false;
                }
            }
            else
            {
                if (distanceTmp > 0.5f * 0.5f)
                {
                    beginMove = true;
                }
            }
        }
        else
        {
            transform.position = new Vector3(target.position.x, target.position.y, -10);
        }

    }

    void StopFollowing()
    {
        beginMove = false;
    }
}

BotController2D.cs

//Copyright @2018 sharpcoderblog.com
//You are free to use this script in free or commercial projects
//Selling the source code of this script is not allowed

using System.Collections;
using UnityEngine;

public class BotController2D : MonoBehaviour
{
    //This script will handle bot control
    public enum BotType { Enemy, Friendly }
    public BotType botType = BotType.Enemy;
    public enum BotDifficulty { Easy, Medium, Hard }
    public BotDifficulty botDifficulty = BotDifficulty.Medium;
    public enum InitialState { Idle, Explore }
    public InitialState initialState = InitialState.Idle; //Should the Bot stand in place until approached or begin exploring the level right away
    public bool canJump = true; //Can this bot jump?

    public enum CurrentState { Idle, MovingLeft, MovingRight, GoinUPLadder, GoingDownLadder, Attack }
    CurrentState currentState;
    InitialState appliedState;
    PlayerController2D pc2d;
    RaycastHit2D hitLeft;
    RaycastHit2D hitRight;
    RaycastHit2D groundHit;
    Vector3 leftOrigin;
    Vector3 rightOrigin;
    float distanceLeft = -1;
    float distanceRight = -1;

    int encounteredLadders = 0;
    int encounteredLaddersCacche = 0;
    Ladder2D previousLadder;
    Ladder2D lastAttachedLadder;
    bool previousCanGoDownOnLadder = false;
    bool previousCanClimbLadder = false;

    //Everything except "Player" and "IgnoreRaycast" layers
    LayerMask layerMask = ~(1 << 2 | 1 << 8);
    //Only "Player" layer
    LayerMask playerLayerMask = 1 << 8;

    float timeMotionless = 0.0f;
    bool statePause = false;

    float trVelocity;
    Vector3 previousPos;

    Collider2D[] detectedPlayers = new Collider2D[0];
    Collider2D[] previousDetectedPlayers = new Collider2D[0];
    PlayerController2D enemyToFollow;
    int followPriority = 0; //0 = Easy, 1 = Medium (This player inflicted the damage)

    [HideInInspector]
    public Transform t;

    bool checkingTotalEnemies = false;
    bool runAway = false;

    int attackingFromLeft = 0;
    int attackingFromRight = 0;

    //Limit attack rate for easy bots
    float attackTimer = 0;
    float nextAttackTime = 0;

    Camera mainCamera;
    float cameraWidth; //Horizontal size of camera view

    // Use this for initialization
    void Start()
    {
        pc2d = GetComponent<PlayerController2D>();
        pc2d.isBot = true;
        t = transform;
        appliedState = initialState;

        if (Random.Range(-10, 10) > 0)
        {
            StartCoroutine(StatePause(CurrentState.Idle, true));
        }
    }

    // Update is called once per frame
    void FixedUpdate()
    {
        //Draw rays back and forth

        if (!mainCamera)
        {
            mainCamera = Camera.main;
            cameraWidth = mainCamera.aspect * mainCamera.orthographicSize;
        }

        rightOrigin = t.position + t.right * (pc2d.playerDimensions.x / 2f);
        hitRight = Physics2D.Raycast(rightOrigin, t.right, cameraWidth, layerMask);
        if (hitRight)
        {
            Debug.DrawLine(rightOrigin, hitRight.point, Color.red);
            distanceRight = hitRight.distance;
        }
        else
        {
            Debug.DrawLine(rightOrigin, rightOrigin + t.right * cameraWidth, Color.cyan);
            distanceRight = -1;
        }

        leftOrigin = t.position - t.right * (pc2d.playerDimensions.x / 2f);
        hitLeft = Physics2D.Raycast(leftOrigin, -t.right, cameraWidth, layerMask);
        if (hitLeft)
        {
            Debug.DrawLine(leftOrigin, hitLeft.point, Color.red);
            distanceLeft = hitLeft.distance;
        }
        else
        {
            Debug.DrawLine(leftOrigin, leftOrigin - t.right * cameraWidth, Color.cyan);
            distanceLeft = -1;
        }

        if (appliedState == InitialState.Explore)
        {
            if (currentState == CurrentState.Idle)
            {
                if (!statePause)
                {
                    //Decide which direction to move
                    if (distanceRight == -1 && distanceLeft == -1)
                    {
                        //Decide random direaction
                        currentState = Random.Range(-10, 10) > 0 ? CurrentState.MovingRight : CurrentState.MovingLeft;
                    }
                    else if (distanceRight == -1 && distanceLeft >= 0)
                    {
                        currentState = CurrentState.MovingRight;
                    }
                    else if (distanceRight >= 0 && distanceLeft == -1)
                    {
                        currentState = CurrentState.MovingLeft;
                    }
                    else if (distanceRight > distanceLeft)
                    {
                        currentState = CurrentState.MovingRight;
                    }
                    else if (distanceRight < distanceLeft)
                    {
                        currentState = CurrentState.MovingLeft;
                    }
                }
            }
            else if (currentState == CurrentState.MovingLeft)
            {
                if (!statePause && pc2d.isGrounded)
                {
                    pc2d.botMovement = -1;
                    float jumpHeightTmp = pc2d.jumpHeight * 0.25f;

                    if (distanceLeft > 0 && distanceLeft < pc2d.playerDimensions.x)
                    {
                        if (hitLeft && canJump &&
                            !Physics2D.Linecast(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) - t.right * pc2d.playerDimensions.x * 2, layerMask) &&
                            Random.Range(-2, 10) > 0
                        )
                        {
                            StartCoroutine(DoJump());
                        }
                        else
                        {
                            if (!enemyToFollow)
                            {
                                StartCoroutine(StatePause(CurrentState.Idle, true));
                            }
                        }
                    }

                    /*if(!Physics2D.Linecast(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) - t.right * pc2d.playerDimensions.x * 2)){
                        Debug.DrawLine(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) - t.right * pc2d.playerDimensions.x * 2, Color.yellow);
                    }
                    else
                    {
                        Debug.DrawLine(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) - t.right * pc2d.playerDimensions.x * 2, Color.red);
                    }*/

                    //Jump if there is no groun in front
                    groundHit = Physics2D.Raycast(leftOrigin, -t.up, pc2d.playerDimensions.y * 2.1f, layerMask);
                    if (groundHit)
                    {
                        Debug.DrawLine(leftOrigin, groundHit.point, Color.red);
                    }
                    else
                    {
                        Debug.DrawLine(leftOrigin, leftOrigin - t.up * (pc2d.playerDimensions.y * 2.1f), Color.blue);
                        if (canJump)
                        {
                            StartCoroutine(DoJump());
                        }
                        else
                        {
                            //StartCoroutine(StatePause(CurrentState.MovingRight, true));
                            StartCoroutine(CheckEnemiesEnumerator(1, 0, false));
                        }
                    }
                }
            }
            else if (currentState == CurrentState.MovingRight)
            {
                if (!statePause && pc2d.isGrounded)
                {
                    pc2d.botMovement = 1;
                    float jumpHeightTmp = pc2d.jumpHeight * 0.25f;

                    if (distanceRight > 0 && distanceRight < pc2d.playerDimensions.x)
                    {
                        if (hitRight && canJump &&
                            !Physics2D.Linecast(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) + t.right * pc2d.playerDimensions.x * 2, layerMask) &&
                            Random.Range(-2, 10) > 0
                        )
                        {
                            StartCoroutine(DoJump());
                        }
                        else
                        {
                            if (!enemyToFollow)
                            {
                                StartCoroutine(StatePause(CurrentState.Idle, true));
                            }
                        }
                    }

                    /*if (!Physics2D.Linecast(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) + t.right * pc2d.playerDimensions.x * 2))
                    {
                        Debug.DrawLine(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) + t.right * pc2d.playerDimensions.x * 2, Color.yellow);
                    }
                    else
                    {
                        Debug.DrawLine(t.position + t.up * jumpHeightTmp, (t.position + t.up * jumpHeightTmp) + t.right * pc2d.playerDimensions.x * 2, Color.red);
                    }*/

                    //Jump if there is no groun in front
                    groundHit = Physics2D.Raycast(rightOrigin, -t.up, pc2d.playerDimensions.y * 2.1f, layerMask);
                    if (groundHit)
                    {
                        Debug.DrawLine(rightOrigin, groundHit.point, Color.red);
                    }
                    else
                    {
                        Debug.DrawLine(rightOrigin, rightOrigin - t.up * (pc2d.playerDimensions.y * 2.1f), Color.blue);
                        if (canJump)
                        {
                            StartCoroutine(DoJump());
                        }
                        else
                        {
                            //StartCoroutine(StatePause(CurrentState.MovingLeft, true));
                            StartCoroutine(CheckEnemiesEnumerator(0, 1, false));
                        }
                    }
                }
            }
            else if (currentState == CurrentState.GoinUPLadder)
            {
                if (!statePause)
                {
                    pc2d.botVerticalMovement = 1;
                    if (!pc2d.currentLadder)
                    {
                        StartCoroutine(StatePause(CurrentState.Idle, true));
                    }
                }
            }
            else if (currentState == CurrentState.GoingDownLadder)
            {
                if (!statePause)
                {
                    pc2d.botVerticalMovement = -1;
                    if (!pc2d.currentLadder)
                    {
                        StartCoroutine(StatePause(CurrentState.Idle, true));
                    }
                }
            }
            else if (currentState == CurrentState.Attack)
            {
                if (!statePause)
                {
                    if (!enemyToFollow)
                    {
                        StartCoroutine(StatePause(CurrentState.Idle, true));
                    }
                    else
                    {
                        //Firing weapon
                        if (attackTimer >= nextAttackTime)
                        {
                            //Check if player is above us and jump
                            if (enemyToFollow.t.position.y > t.position.y && enemyToFollow.t.position.y - t.position.y > pc2d.playerDimensions.y * 0.95f)
                            {
                                if (Random.Range(-5, 10) > 0)
                                {
                                    StartCoroutine(DoJump());
                                }
                            }
                            //

                            pc2d.Attack();

                            if (botDifficulty == BotDifficulty.Easy)
                            {
                                attackTimer = 0;
                                nextAttackTime = Random.Range(0.25f, 0.95f);
                            }
                            if (botDifficulty == BotDifficulty.Medium)
                            {
                                attackTimer = 0;
                                nextAttackTime = Random.Range(0.01f, 0.37f);
                            }
                            if (botDifficulty == BotDifficulty.Hard)
                            {
                                attackTimer = 0;
                                nextAttackTime = Random.Range(0.01f, 0.24f);
                            }
                        }
                        else
                        {
                            attackTimer += Time.deltaTime;
                        }


                        if (enemyToFollow && !checkingTotalEnemies)
                        {
                            if (enemyToFollow.t.position.x > t.position.x && !pc2d.facingRight)
                            {
                                pc2d.facingRight = true;
                            }
                            if (enemyToFollow.t.position.x < t.position.x && pc2d.facingRight)
                            {
                                pc2d.facingRight = false;
                            }

                            attackingFromLeft = 0;
                            attackingFromRight = 0;

                            //Check if there too many player attacking us and run away
                            for (int i = 0; i < detectedPlayers.Length; i++)
                            {
                                if (detectedPlayers[i])
                                {
                                    BotController2D bcTmp = detectedPlayers[i].GetComponent<BotController2D>();
                                    if (bcTmp && bcTmp.botType != botType && bcTmp.enemyToFollow == pc2d && bcTmp.currentState == CurrentState.Attack)
                                    {
                                        if (bcTmp.t.position.x > t.position.x)
                                        {
                                            attackingFromRight++;
                                        }
                                        else
                                        {
                                            attackingFromLeft++;
                                        }
                                    }
                                }
                            }

                            //If the value playerHP from PlayerController2D get too low, and the bot is being attacked, increase the probability to run away
                            if (attackingFromRight >= 2 || attackingFromLeft >= 2 || (pc2d.playerHP < 70 && botDifficulty == BotDifficulty.Hard && (attackingFromRight > 0 || attackingFromLeft > 0)) || (pc2d.playerHP < 40 && botDifficulty == BotDifficulty.Medium && (attackingFromRight > 0 || attackingFromLeft > 0)))
                            {
                                StartCoroutine(CheckEnemiesEnumerator(attackingFromLeft, attackingFromRight, false));
                            }
                        }
                    }
                }
            }
        }

        if (pc2d.currentLadder && (previousLadder != pc2d.currentLadder || previousCanGoDownOnLadder != pc2d.canGoDownOnLadder || previousCanClimbLadder != pc2d.canClimbLadder))
        {
            previousLadder = pc2d.currentLadder;
            previousCanGoDownOnLadder = pc2d.canGoDownOnLadder;
            previousCanClimbLadder = pc2d.canClimbLadder;

            if (!pc2d.isAttachedToLadder)
            {
                if (pc2d.canClimbLadder)
                {
                    encounteredLadders++;

                    if ((lastAttachedLadder != pc2d.currentLadder || encounteredLadders > 1) && !statePause)
                    {
                        if (Random.Range(-10, 10) > 0)
                        {
                            if (pc2d.canGoDownOnLadder)
                            {
                                StartCoroutine(StatePause(CurrentState.GoingDownLadder, true));
                            }
                            else
                            {
                                StartCoroutine(StatePause(CurrentState.GoinUPLadder, true));
                            }
                        }
                    }
                }
            }
            else
            {
                encounteredLadders = 0;
                lastAttachedLadder = pc2d.currentLadder;
            }
        }

        trVelocity = ((t.position - previousPos).magnitude) / Time.deltaTime;
        previousPos = t.position;

        if (trVelocity < 0.01f && !statePause)
        {
            timeMotionless += Time.deltaTime;

            if (timeMotionless > 0.5f)
            {
                StartCoroutine(StatePause(CurrentState.Idle, true));
            }
        }
        else
        {
            timeMotionless = 0;
        }

        //Detect and attack enemy players
        detectedPlayers = Physics2D.OverlapCircleAll(t.position, cameraWidth, playerLayerMask);

        if (!enemyToFollow)
        {
            if (!runAway)
            {
                if (previousDetectedPlayers.Length != detectedPlayers.Length || (previousDetectedPlayers.Length > 0 && detectedPlayers.Length > 0 && previousDetectedPlayers[0] != detectedPlayers[0]))
                {
                    previousDetectedPlayers = detectedPlayers;

                    for (int i = 0; i < detectedPlayers.Length; i++)
                    {
                        BotController2D bcTmp = detectedPlayers[i].GetComponent<BotController2D>();
                        PlayerController2D pc2dTmp = null;
                        if (!bcTmp)
                        {
                            pc2dTmp = detectedPlayers[i].GetComponent<PlayerController2D>();
                        }
                        if ((pc2dTmp && botType == BotType.Enemy) || (bcTmp && bcTmp.botType != botType))
                        {
                            Vector3 enemyPos = bcTmp ? bcTmp.t.position : pc2dTmp.t.position;
                            float yDistance = Mathf.Abs(enemyPos.y - t.position.y);
                            if (yDistance < pc2d.playerDimensions.y * 2)
                            {
                                if (!enemyToFollow || Mathf.Abs(enemyPos.x - t.position.x) < Mathf.Abs(enemyToFollow.t.position.x - t.position.x))
                                {
                                    enemyToFollow = bcTmp ? bcTmp.pc2d : pc2dTmp;
                                    appliedState = InitialState.Explore;
                                }
                            }

                        }
                    }
                }
            }
        }
        else
        {
            float yDistance = enemyToFollow.t.position.y - t.position.y;
            float xDistance = enemyToFollow.t.position.x - t.position.x;
            if (Mathf.Abs(yDistance) >= pc2d.playerDimensions.y * 2 || Mathf.Abs(xDistance) > cameraWidth || !enemyToFollow.enabled)
            {
                enemyToFollow = null;
            }
            else
            {
                if (Mathf.Abs(xDistance) > pc2d.playerDimensions.x * 1.45f)
                {
                    if (!statePause && pc2d.botVerticalMovement == 0)
                    {
                        if (xDistance > 0)
                        {
                            if (currentState != CurrentState.MovingRight)
                            {
                                statePauseCoroutine = StartCoroutine(StatePause(CurrentState.MovingRight, false));
                            }
                        }
                        else if (xDistance < 0)
                        {
                            if (currentState != CurrentState.MovingLeft)
                            {
                                statePauseCoroutine = StartCoroutine(StatePause(CurrentState.MovingLeft, false));
                            }
                        }
                    }
                    else
                    {
                        StopPauseCoroutine();
                    }
                }
                else
                {
                    if (pc2d.botVerticalMovement == 0)
                    {
                        if (currentState != CurrentState.Attack)
                        {
                            if (!statePause)
                            {
                                statePauseCoroutine = StartCoroutine(StatePause(CurrentState.Attack, true));
                            }
                        }
                        else
                        {
                            if (Mathf.Abs(xDistance) < pc2d.playerDimensions.x / 3 && !checkingTotalEnemies)
                            {
                                //print("Enemies are too close!!!");
                                StartCoroutine(CheckEnemiesEnumerator(attackingFromLeft, attackingFromRight, true));
                            }
                        }
                    }
                }
            }
        }
    }

    Coroutine statePauseCoroutine = null;

    void StopPauseCoroutine()
    {
        if (statePauseCoroutine != null)
        {
            StopCoroutine(statePauseCoroutine);
            statePauseCoroutine = null;
            statePause = false;
        }
    }

    IEnumerator StatePause(CurrentState newState, bool stopMovement)
    {
        //print("State pause");
        statePause = true;
        if (stopMovement)
        {
            pc2d.botMovement = 0;
            pc2d.botVerticalMovement = 0;
        }
        currentState = newState;

        if (newState == CurrentState.Attack && botDifficulty == BotDifficulty.Hard)
        {
            yield return new WaitForSeconds(Random.Range(0.15f, 0.45f));
        }
        else
        {
            yield return new WaitForSeconds(Random.Range(0.45f, 0.75f));
        }


        statePause = false;
    }

    IEnumerator DoJump()
    {
        //print("Do jump");
        statePause = true;
        pc2d.botJump = true;

        yield return new WaitForSeconds(0.65f);

        statePause = false;
    }

    IEnumerator CheckEnemiesEnumerator(int attackingFromLeft, int attackingFromRight, bool doNotRunAway)
    {
        checkingTotalEnemies = true;

        //print("CHECKING FOR TOTAL ENEMIES");

        yield return new WaitForSeconds(Random.Range(0.27f, 0.75f));

        if (Random.Range(-10, 10) > 0)
        {
            runAway = true;
            enemyToFollow = null;

            if (attackingFromLeft > attackingFromRight)
            {
                currentState = CurrentState.MovingRight;
            }
            else
            {
                currentState = CurrentState.MovingLeft;
            }
        }

        checkingTotalEnemies = false;

        if (runAway)
        {
            if (doNotRunAway)
            {
                //Simply walk away a bit
                yield return new WaitForSeconds(Random.Range(0.37f, 0.75f));
            }
            else
            {
                //Run away
                yield return new WaitForSeconds(Random.Range(1.57f, 2.45f));
            }


            runAway = false;
        }
    }

    public static Vector2 ColliderDimensions(Collider2D sp)
    {
        return new Vector2(sp.bounds.max.x - sp.bounds.min.x, sp.bounds.max.y - sp.bounds.min.y);
    }
}

Stap 2: Stel de speler en de vijanden in

Nu is het tijd om onze speler en de AI van de vijand in te stellen met behulp van de bovenstaande scripts.

Onze Player-instantie instellen

• Maak een nieuw GameObject en geef het een naam "Player"
• Wijzig de tag van dat object in "Player"
• Wijzig de laag van het object in 8 (als er geen laag 8 in de selectie zit, voeg er dan een toe door op Laag toevoegen... te klikken, noem deze "Player")
• Maak nog een GameObject, noem het "Body" en voeg een SpriteRenderer-component toe
• Wijs uw speler-Sprite toe aan een "Body" en verplaats deze binnen het "Player"-object
• Selecteer het object "Player" en voeg de componenten CapsuleCollider2D, Rigidbody2D en PlayerController2D toe
• Schaal de CapsuleCollider2D totdat deze in de speler-Sprite past

Zoals je kunt zien heeft PlayerController2D een aantal variabelen, de meeste spreken voor zich, maar één ervan heeft wat uitleg nodig:

PlayerHP - deze waarde wordt gebruikt in BotController2D om te beslissen of de AI moet wegrennen als de HP te laag is.

Gebruik de PlayerHP-variabele bij het implementeren van de aanvalsfunctie (controleer void Attack() aan het einde van het PlayerController2D.cs-script).

Spelercamera instellen

• Selecteer de hoofdcamera en voeg de component CameraFollow2D toe
• Wijs de speler toe aan de doelvariabele
• Optioneel kunt u de Offset-variabele aanpassen (als u niet wilt dat de camera precies in het midden wordt gecentreerd)

Een ladder opzetten

PlayerController2D ondersteunt ook beklimbare ladders.

Een nieuwe ladder opzetten is heel eenvoudig:

• Maak een nieuw GameObject en roep het aan "Ladder"
• Verander de laag naar "IgnoreRaycast"
• Maak een ander spelobject met een SpriteRenderer en wijs een sprite van je ladder toe en verplaats deze binnen het Ladder-object
• Voeg BoxCollider2D- en Ladder2D-componenten toe aan het "Ladder"-object
• Schaal de afmetingen van de botsing zodat deze overeenkomen met de ladder-Sprite en markeer deze als Trigger

De vijandelijke AI instellen

• Ga eerst naar het Physics2D-paneel en schakel een botsing tussen de Speler-laag uit, zodat de bots en spelers niet tussen elkaar vast komen te zitten.

• Dupliceer de Player-instantie
• Voeg een BotController2D-component toe
• De bot is nu klaar

Bekijk de onderstaande video om de vijandelijke AI in actie te zien (de witte instantie is onze speler, de rode instanties worden bestuurd door de AI):