I want to have the enemy AI to shoot the player as well as dodging the projectile from the player. I can get the enemy to chase the player but I can’t get it to shoot and dodge the projectile.
using UnityEngine;
using System.Collections;
public class EnemyControllerBasic : MonoBehaviour {
// The reference to the bullet prefab for Enemies
public Projectile EnemyBullet;
// The game object which spawn us
private ShipPlayerController PlayerShipCtrl;
// The speed to use when in "ramming" mode
[SerializeField] float RamSpeed = 5.0f;
// The different IDs for the AI states
enum AIMode { Normal, Ramming, SteerTowards };
// The variable which holds the current AI state
private AIMode CurrentAIState;
// list of pickup Types to spawn
[SerializeField] GameObject[] PickupTypes;
// Used to control how fast the game object moves
[SerializeField] float MoveSpeed = 5.0f;
// Use this for initialization
void Start () {
Destroy(gameObject, 5.0f);
// find the player ship game object by name
GameObject playerShip = GameObject.Find("PlayerShip");
// Acess the player ship's script component by type
PlayerShipCtrl = playerShip.GetComponent<ShipPlayerController>();
// Always start in the normal state
CurrentAIState = AIMode.Normal;
}
// Update is called once per frame
void Update () {
transform.position +=
transform.up * Time.deltaTime * MoveSpeed;
// Decides which AI state should be currently active
DetermineAIState();
// Depending on the current AI mode, call the update function
switch (CurrentAIState)
{
// Normal State
case AIMode.Normal:
UpdateNormal();
break;
// Ramming State
case AIMode.Ramming:
UpdateNormal();
break;
// Steer sowards the player
case AIMode.SteerTowards:
UpdateSteerTowards();
break;
}
}
// Called by the engine when this object collides
// with another object containing collision
void OnTriggerEnter(Collider other) {
// Hit the player's projectile?
if (other.tag == "PlayerProjectile")
{
// Projectile instant kills us
Destroy(gameObject);
// Drop a pickup
SpawnPickup();
}
// Hit the player ship?
else if (other.tag == "PlayerShip")
{
// Wrecking with the player kills us
Destroy(gameObject);
// Remove the points from the player for hitting this enemy
PlayerShipCtrl.ModScore(-1);
}
}
void SpawnPickup() {
// Randomly choose an index in the pickup array
int randIndex = Random.Range(0, PickupTypes.Length);
// use the random index to select one of the enemy
Instantiate(PickupTypes[randIndex],
transform.position, transform.rotation);
}
// Update the enemy when in "Normal" state
void UpdateNormal() {
// Move the object in the direction it is facing
transform.position +=
transform.up * Time.deltaTime * MoveSpeed;
}
// Applies the AI ramming movement
void UpdateRamming() {
// Move the object in the direction it is facing over a peroid amount of time
transform.position +=
transform.up * Time.deltaTime * RamSpeed;
}
void DetermineAIState() {
// Use our helper function to determine if the player
// ship is in the line of the sight of this enemy ship
bool canSee = CanSeeTarget("PlayerShip");
// Subtract the enemy's current position from the player's location
Vector3 directionToplayer =
PlayerShipCtrl.transform.position - transform.position;
// Store the normalized version of the direction to remove its length
Vector3 DirToPlayerNorm = directionToplayer.normalized;
// Not products of two vectors represent a cosine angle between them
float product = Vector3.Dot(transform.up, DirToPlayerNorm);
// Convert to cosine to a radiant angle
float angle = Mathf.Acos(product);
// Convert the radian angle into a degree angle
angle = angle * Mathf.Rad2Deg;
// Check if the player ship is close enough
// to be considered in front of the player
if (canSee)
{
// if so, change the ramming mode
CurrentAIState = AIMode.Ramming;
// Add a little visual feedback and change it to red
renderer.material.color = Color.red;
}
// Check if the player ship is outside the enemy's vision
else if (product > 0 && angle < 90)
{
// Change the state to steertoward
CurrentAIState = AIMode.SteerTowards;
// Change its color to green to denote
// that it found the player
renderer.material.color = Color.green;
}
else
{
// if not, return to the normal state
CurrentAIState = AIMode.Normal;
// Restore the color back to normal
renderer.material.color = Color.white;
}
}
// Determines if the this AI can "See" the player
bool CanSeeTarget(string _targetTag)
{
// Contains data about collision
RaycastHit hitInfo;
// Performs a ray cast
bool hitAny = Physics.Raycast(transform.position, transform.up, out hitInfo);
if (hitAny)
{
if (hitInfo.collider.gameObject.tag == _targetTag)
{
return true;
}
}
return false;
}
// Handles the movement and rotation towards the player
void UpdateSteerTowards() {
// Subtact the enemy's current position form the player's
Vector3 directionToplayer =
PlayerShipCtrl.transform.position - transform.position;
// Rotate the enemy's movement direction towards the player
transform.up = Vector3.RotateTowards(transform.up,
directionToplayer,
Time.deltaTime * MoveSpeed,
0.0f);
UpdateNormal();
}
}
