Touch Thumbstick Maths

I made this touch thumbstick script, my maths is pretty subpar so it took me a while, everything seems to be working except for one issue, when I release the thumbstick and it's axis is supposed to be 0, 0 the x axis becomes some weird number with letters but the y goes back to 0.

Why?

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using UnityEngine.EventSystems;
4.  
5. public class ThumbStick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
6. {
7.  
8.     [SerializeField]
9.     private Vector2 originalStickPosition;
10.  
11.     private Vector2 initialContactPoint;
12.  
13.     public Vector2 Axis;
14.  
15.     private float radius;
16.  
17.  
18.     void Start()
19.     {
20.         originalStickPosition = this.transform.position;
21.  
22.         radius = this.gameObject.GetComponentInParent<Image>().sprite.rect.width * 2.5f;
23.  
24.     }
25.  
26.  
27.     void Update()
28.     {
29.  
30.         Axis = (-originalStickPosition + (Vector2)this.transform.position) / radius;
31.  
32.     }
33.  
34.  
35.     public void OnDrag(PointerEventData eventData)
36.     {
37.         Vector2 realPosition = eventData.position - initialContactPoint;
38.  
39.         float distance = Vector3.Distance(realPosition, originalStickPosition);
40.  
41.         if (distance > radius)
42.         {
43.             Vector3 fromOriginToObject = realPosition - originalStickPosition;
44.             fromOriginToObject *= radius / distance;
45.             this.transform.position = originalStickPosition + (Vector2)fromOriginToObject;
46.         }
47.         else this.transform.position = realPosition;
48.  
49.     }
50.  
51.     public void OnPointerDown(PointerEventData eventData)
52.     {
53.    
54.         initialContactPoint = eventData.position - originalStickPosition;
55.     }
56.  
57.     public void OnPointerUp(PointerEventData eventData)
58.     {
59.      
60.         this.transform.position = originalStickPosition;
61.     }
62.  
63.  
64. }
65.  

 

Got it working, this is the updated script if the answer is ever needed.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using UnityEngine.EventSystems;
4.  
5. public class ThumbStick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
6. {
7.  
8.     [SerializeField]
9.     private Vector2 originalStickPosition;
10.  
11.     private Vector2 initialContactPoint;
12.  
13.     public Vector2 Axis;
14.  
15.     private float radius;
16.  
17.  
18.     void Start()
19.     {
20.         originalStickPosition = this.transform.position;
21.         radius = this.gameObject.GetComponentInParent<Image>().sprite.rect.width * 2.5f;
22.     }
23.  
24.  
25.     void Update()
26.     {
27.         Vector2 moveVector = -originalStickPosition + (Vector2)this.transform.position;
28.         moveVector = moveVector.normalized;
29.         Axis = (moveVector);
30.     }
31.  
32.  
33.     public void OnDrag(PointerEventData eventData)
34.     {
35.         Vector2 realPosition = eventData.position - initialContactPoint;
36.  
37.         float distance = Vector3.Distance(realPosition, originalStickPosition);
38.  
39.         if (distance > radius)
40.         {
41.             Vector3 fromOriginToObject = realPosition - originalStickPosition;
42.             fromOriginToObject *= radius / distance;
43.             this.transform.position = originalStickPosition + (Vector2)fromOriginToObject;
44.         }
45.         else this.transform.position = realPosition;
46.  
47.     }
48.  
49.     public void OnPointerDown(PointerEventData eventData)
50.     {
51.    
52.         initialContactPoint = eventData.position - originalStickPosition;
53.     }
54.  
55.     public void OnPointerUp(PointerEventData eventData)
56.     {
57.        
58.         this.transform.position = originalStickPosition;
59.     }
60.  
61.  
62. }

 

You're welcome to look at my VAButton class, which is a virtual analog button. Works for mouse and/or multitouch. You can get it here in my proximity_buttons package:

proximity_buttons is presently hosted at these locations:

https://bitbucket.org/kurtdekker/proximity_buttons

https://github.com/kurtdekker/proximity_buttons

https://gitlab.com/kurtdekker/proximity_buttons

https://sourceforge.net/projects/proximity-buttons/