Joystick moves unexpectedly in Unity

Question

Context: I am using the FixedJoystick in Joystick Pack by Fenerax Studios on Unity asset store in my project.

The problem is whenever I touch the joystick (without even moving it), the handle immediately shifts to the upper right corner and my model moves downwards as a result.

Below is the image illustrating joystick issue:

[1]: /storage/temp/133489-joystick-bug.png

The red cross in the image indicates where the user touches the joystick, the handle doesn't move there as expected but jumps upwards instead.

Here is the code:

 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;
 
 public class FixedJoystick : Joystick
 {
     Vector2 joystickPosition = Vector2.zero;
     public GameObject heldDownBlockRegion;
     private Camera cam = new Camera();
     private bool inARMode = true;
 
 
 
 void Start()
 {
     joystickPosition = RectTransformUtility.WorldToScreenPoint(cam, background.position);
     gameObject.SetActive(false);
 
 }
 
 
 public override void OnDrag(PointerEventData eventData)
 {
     Vector2 direction = eventData.position - joystickPosition;
     inputVector = (direction.magnitude > background.sizeDelta.x / 2f) ? direction.normalized : direction / (background.sizeDelta.x / 2f);
     ClampJoystick();
     handle.anchoredPosition = (inputVector * background.sizeDelta.x / 2f) * handleLimit;
 }
 
 public override void OnPointerDown(PointerEventData eventData)
 {
     heldDownBlockRegion.SetActive(true);
     OnDrag(eventData);
 }
 
 public override void OnPointerUp(PointerEventData eventData)
 {
     heldDownBlockRegion.SetActive(false);
     inputVector = Vector2.zero;
     handle.anchoredPosition = Vector2.zero;
 }
 
 public void changeToAR()
 {
     showJoyStick(false);
     inARMode = true;
 }
 
 public void changeToNonAR()
 {
     inARMode = false;
 }
 
 public void showJoyStick(bool action)
 {
     if (!inARMode)
     {
         if (action == false)
         {
             heldDownBlockRegion.SetActive(false);
             inputVector = Vector2.zero;
             handle.anchoredPosition = Vector2.zero;
         }
         gameObject.SetActive(action);
     }
 }
 }

I am pretty new to this and would really appreciate any help. Thanks!

Answer 1

Answer by mauriciomb · Jul 02, 2020 at 06:09 PM

@cho_yangxuan I had this same problem but with the floating joystick. The first touch down would move my player object down left until release. I figured out a solution to simulate a pointer down and up at the Start method in the Joystick class. Here is the code:

     var pointer = new PointerEventData(EventSystem.current);
     ExecuteEvents.Execute(gameObject, pointer, ExecuteEvents.pointerDownHandler);
     ExecuteEvents.Execute(gameObject, pointer, ExecuteEvents.pointerUpHandler);

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goodos_ · Jun 12, 2021 at 05:05 PM 0

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Thx u so much!

mohamedkaram09 · Jan 16 at 12:12 PM 0

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That's actually pretty smart. I had the same problem and tried everything to fix it from my code until I finally came to the conclusion that the joystick package itself is bugged for some reason (I may be wrong though)

anyways, your solution worked perfectly for me but with a $$anonymous$$or change since I had a problem with dragging not tapping. Here is the code for any future lost developers as myself!

  var pointer = new PointerEventData(EventSystem.current);
         ExecuteEvents.Execute(gameObject, pointer, ExecuteEvents.dragHandler);
         ExecuteEvents.Execute(gameObject, pointer, ExecuteEvents.pointerUpHandler);

Joystick moves unexpectedly in Unity

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