8 directional shooting for top down 2D shooter?

Hello all,
Currently in a 2D top down shooter, I am using the following script on an touchscreen joystick to shoot in whichever direction the player presses the stick. This works perfectly, but I've noticed it can be a bit tricky to aim like this when using a touchpad instead of a physical joystick.

What I would like to do is sacrifice a bit of precision to help the player become more accurate, by only allowing the player to fire in 8 directions instead of any angle.

My current code looks like this:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityStandardAssets.CrossPlatformInput;
4.  
5. public class NewBehaviourScript : MonoBehaviour
6. {
7.  
8.     public float attackSpeed = 0.5f;
9.     public float coolDown;
10.     public float projectileSpeed = 500;
11.  
12.     public ObjectPooler projectilePool;      
13.  
14.     void Update ()
15.     {
16.         transform.eulerAngles = new Vector3(transform.eulerAngles.x, transform.eulerAngles.y, Mathf.Atan2(CrossPlatformInputManager.GetAxisRaw ("HorizontalShoot"),CrossPlatformInputManager.GetAxisRaw ("VerticalShoot")) * Mathf.Rad2Deg);
17.  
18.         if(CrossPlatformInputManager.GetAxisRaw ("HorizontalShoot") > 0.5f ||CrossPlatformInputManager.GetAxisRaw ("HorizontalShoot") < -0.5f)
19.         {  
20.             if(Time.time >= coolDown)
21.             {
22.                     Fire();
23.             }
24.         }
25.         if(CrossPlatformInputManager.GetAxisRaw ("VerticalShoot") > 0.5f ||CrossPlatformInputManager.GetAxisRaw ("VerticalShoot") < -0.5f)
26.         {
27.            
28.  
29.             if(Time.time >= coolDown)
30.             {              
31.                     Fire();
32.             }
33.         }
34.     }
35.  
36.     void Fire()
37.     {
38.         GameObject newProjectile = projectilePool.GetPooledObject();
39.         newProjectile.transform.position = transform.position + transform.up *1f;
40.         newProjectile.transform.rotation = transform.rotation;
41.         newProjectile.GetComponent<DestroyOverTime>().lifetime = newProjectile.GetComponent<DestroyOverTime>().lifeTimeStore;
42.         newProjectile.SetActive(true);
43.         newProjectile.GetComponent<Rigidbody2D>().AddForce(transform.up * projectileSpeed);
44.  
45.         coolDown = Time.time + attackSpeed;
46.     }
47. }

What do you think would be the best way to accomplish this? Thanks!

 

bump

 

Get angle in degrees, divide by 45 and cast the result to int then multiply back up or something? should snap.

 

That sounds good, I just wasn't sure whether I needed to approach this from a different angle (no pun intended) rather that add to what I already have here. I'll see if I can figure out how to do this; this is my first time using the atan2 and rad2deg, so I'm still trying to wrap my head around that bit of trig.