Adding gun to our Robot

         At first, part of the tutorial we learned how to give the ability to walk and jump with animation to our Robot, now we will give him a gun and shoot enemies with bullets, we will add also enemies that our robot will kill them, but we have to be sure our robot is stronger than other robots :P Now let's get started straight to work :D

 

FIRST STEP: ADD GUN TO OUR PLAYER AND SHOOT WITH IT

 

      Now the first thing we will do is create a script that will control our weapon, we will call it "Weapon" the script is below:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Weapon : MonoBehaviour
{
    public float offset;
    public GameObject projectile;
    public GameObject shotEffect;
    public Transform shotPoint;
    private float timeBtwShots;
    public float startTimeBtwShots;
    private void Update()
    {
        // Handles the weapon rotation
        Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        float rotZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;
        transform.rotation = Quaternion.Euler(0f, 0f, rotZ + offset);
        if (timeBtwShots <= 0)
        {
            if (Input.GetMouseButton(0))
            {
                Instantiate(shotEffect, shotPoint.position, Quaternion.identity);
                Instantiate(projectile, shotPoint.position, transform.rotation);
                timeBtwShots = startTimeBtwShots;
            }
        }
        else
        {
            timeBtwShots -= Time.deltaTime;
        }
    }
}

After we write this script we will drag it at Gun gameObject

After that, if you hit play, you will see that or gun faces our mouse cursor, like in the photo below, it looks cool, right?

 Now is time for the bullet script and object

    Firstly, let's write the bullet script

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class Bullet : MonoBehaviour

{

    public float speed;

    public float lifeTime;

    public float distance;

    public int damage;

    public LayerMask whatIsSolid;

    public GameObject destroyEffect;

    private void Start()

    {

        Invoke("DestroyProjectile", lifeTime);

    }

    private void Update()

    {

        RaycastHit2D hitInfo = Physics2D.Raycast(transform.position, transform.up, distance, whatIsSolid);

        if (hitInfo.collider != null)

        {

            if (hitInfo.collider.CompareTag("Enemy"))

            {

                

            }

            DestroyProjectile();

        }

        transform.Translate(Vector2.right * speed * Time.deltaTime);

    }

    void DestroyProjectile()

    {

        Instantiate(destroyEffect, transform.position, Quaternion.identity);

        Destroy(gameObject);

    }

}

After we create the bullet script is time to create a bullet gameObject, this is how to do it

You will see a circle, color it purple like the gun and add to the circle, Bullet script, circle collider and rigidbody 2d, it should look like below

 

 

 

 

 

 Now name the circle, bullet, and drag it to the project files, to make it prefab, and to remove it from scene

 

 

 

 

 Now at JMO assets you have very cool particle system, add them at shoot effect to weapon script and destroy effect to bullet script, and will look smth like this

 

 

 

 

 Now our player shoots with gun, now is time to add enemies, so that we have a target who to shoot, because shooting just in air is pointless

To add enemies, go to project ⇒ assets ⇒ enemy and there you will see enemy robot as a prefab

 

 Click on the robot and drag it to the scene, now is time to write code for the enemy, also we should add a line of code to bullet script, this line of code will make our enemy take damage when it will get hit by the bullet

Firstly, we will create a script called "Enemy" and we will drag it to our enemy, code is below

using System.Collections; using System.Collections.Generic; using UnityEngine; public class Enemy : MonoBehaviour {     public int health;     public GameObject deathEffect;     public GameObject explosion;     private void Update()     {         if (health <= 0)         {             Instantiate(deathEffect, transform.position, Quaternion.identity);             Destroy(gameObject);         }     }     public void TakeDamage(int damage)     {         Instantiate(explosion, transform.position, Quaternion.identity);         health -= damage;     } }

Add this script to EnemyRobot, and now our enemy with this script has a heath, and can die, but we also have to add that line of code at bullet script, to make it easier for you I will show you the full code, just copy and paste all the code to bullet script

 using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class Bullet : MonoBehaviour

{

    public float speed;

    public float lifeTime;

    public float distance;

    public int damage;

    public LayerMask whatIsSolid;

    public GameObject destroyEffect;

    private void Start()

    {

        Invoke("DestroyProjectile", lifeTime);

    }

    private void Update()

    {

        RaycastHit2D hitInfo = Physics2D.Raycast(transform.position, transform.up, distance, whatIsSolid);

        if (hitInfo.collider != null)

        {

            if (hitInfo.collider.CompareTag("Enemy"))

            {

                hitInfo.collider.GetComponent<Enemy>().TakeDamage(damage);

            }

            DestroyProjectile();

        }

        transform.Translate(Vector2.right * speed * Time.deltaTime);

    }

    void DestroyProjectile()

    {

        Instantiate(destroyEffect, transform.position, Quaternion.identity);

        Destroy(gameObject);

    }

}

Now make sure that our RobotEnemy inspector looks like this

 

 

 

 

 Also make sure that

 

 

 

 

 And we finally can aim at enemy with mouse, shoot with gun and kill the enemy robot, the demonstration of work is shown below

 

 

 

 

 

 

Now we just created a monster :P we can move, jump with animation and aim mouse, shoot and kill enemies >:) 

Now on the next tutorial we will polish it, we will add screen shake and ripple effect when our enemy dies, blood splatter, enemy corpses, adding sound effect etc

 

 See you in the next one, peace.

                                    Worked by Michael Shollaj