Move & Shoot on MobileTutorial on Creating A Mobile Joystick Controller in Unity

Source Code for joystickShoot.cs

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

public class joystickShoot : MonoBehaviour {
    public Transform player;
    public float speed = 15.0f;
    public GameObject bulletPrefab;

    public Transform circle;
    public Transform outerCircle;

    private Vector2 startingPoint;
    private int leftTouch = 99;

    
    // Update is called once per frame
    void Update () {
        int i = 0;
        while(i < Input.touchCount){
            Touch t = Input.GetTouch(i);
            Vector2 touchPos = getTouchPosition(t.position); // * -1 for perspective cameras
            if(t.phase == TouchPhase.Began){
                if(t.position.x > Screen.width / 2){
                    shootBullet();
                }else{
                    leftTouch = t.fingerId;
                    startingPoint = touchPos;
                }
            }else if(t.phase == TouchPhase.Moved && leftTouch == t.fingerId){
                Vector2 offset = touchPos - startingPoint;
                Vector2 direction = Vector2.ClampMagnitude(offset, 1.0f);

                moveCharacter(direction);

                circle.transform.position = new Vector2(outerCircle.transform.position.x + direction.x, outerCircle.transform.position.y + direction.y);

            }else if(t.phase == TouchPhase.Ended && leftTouch == t.fingerId){
                leftTouch = 99;
                circle.transform.position = new Vector2(outerCircle.transform.position.x, outerCircle.transform.position.y);
            }
            ++i;
        }

    }
    Vector2 getTouchPosition(Vector2 touchPosition){
        return GetComponent<Camera>().ScreenToWorldPoint(new Vector3(touchPosition.x, touchPosition.y, transform.position.z));
    }

    void moveCharacter(Vector2 direction){
        player.Translate(direction * speed * Time.deltaTime);
    }
    void shootBullet(){
        GameObject b = Instantiate(bulletPrefab) as GameObject;
        b.transform.position = player.transform.position;
    }
}

Source Code for bullet.cs

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

public class bullet : MonoBehaviour {
    public float speed = 50.0f;
    private Rigidbody2D rb;
    private Vector2 screenBounds;

    public GameObject explosion;

    // Use this for initialization
    void Start () {
        rb = this.GetComponent<Rigidbody2D>();
        rb.velocity = new Vector2(speed, 0);
        screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
    }

    // Update is called once per frame
    void Update () {
        if(transform.position.x > screenBounds.x * -2){
            Destroy(this.gameObject);
        }
    }
    private void OnTriggerEnter2D(Collider2D other){
        if(other.tag == "asteroid"){
            GameObject e = Instantiate(explosion) as GameObject;
            e.transform.position = transform.position;
            Destroy(other.gameObject);
            Destroy(this.gameObject);
        }
    }
}

Resources

• Unity Remote App
• Desktop Move & Shoot Tutorial
• Joystick Tutorial
• Keep Object in Bounds Tutorial
• Deploy Asteroids Tutorial
• Download Bullet Asset