StandEnemy.cs

using UnityEngine;
using System.Collections;

public class StandEnemy : MonoBehaviour
{


    private Camera          cam;                //game camera
    private Transform       myTransform;            //transform cache
    public float            speed ;             //speed
    public Vector3          targetPosition;         //target
    private Vector3         tmpTarget;          //temporary target
    bool                hit;                //hit or not

    GameObject          ship;               //the ship object
    ShipControl             shipControl;            //the ship script
    GameObject          enemiesGenerator;       //the generator object
    Enemies             enemies;            //the generator script

    // Use this for initialization
    void Start ()
    {
        //getting variables from the ship
        ship = GameObject.Find ("Ship");
        shipControl = ship.GetComponent<ShipControl> ();

        //getting variables from the enemies generator
        enemiesGenerator = GameObject.Find ("Enemies Generator");
        enemies = enemiesGenerator.GetComponent<Enemies> ();

        //setting values
        myTransform = transform;
        speed = 5;
        targetPosition =
        new Vector3 (shipControl.myTransform.position.x,shipControl.myTransform.position.y, 0);
        hit = false;
        if (cam == null) {
            cam = Camera.main;

        }
    }


    /* TO-DO
     * move to target (player)
     * if hit another enemie
     * > > move to random target
     * if reach target
     * > > go back to previous target
     *
     * */


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

        //target position has reached the random target (keep reading you'll get it )
        if (targetPosition == tmpTarget)
        {
            hit = false;
        }
        //if there is a collision
        if (hit)
        {
            //move the targetPosition to the random target (tmpTarget)
            targetPosition = Vector3.MoveTowards (targetPosition, tmpTarget, speed * Time.deltaTime);
        }
            //if the targetPosition has reach the random target, then the player become the target
        else
        {
            targetPosition =Vector3.MoveTowards
                (targetPosition, shipControl.myTransform.position, speed * Time.deltaTime);
        }
        //move toward the target
        myTransform.position = Vector3.MoveTowards
                (myTransform.position, targetPosition, speed * Time.deltaTime);
        }

    void OnTriggerEnter (Collider collider)
    {

        //if get shot
        if (collider.gameObject.CompareTag ("Bullet"))
        {
            Destroy (gameObject);
            print (gameObject.name);
            enemies.standList.Remove (GameObject.Find (gameObject.name));
        }

        // if collide with another enemy
        if (collider.gameObject.CompareTag ("stand_enemy"))
        {
            hit = true;
            tmpTarget = new Vector3 (Random.Range (-10, 10), Random.Range (-5, 5), 0);
            Debug.Log (gameObject.name + ": " + targetPosition);
        }
    }
}