Joystick ảo trên màn hình cảm ứng

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class TouchJoystick : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
{
    public Image joystickBackground;
    public Image joystickHandle;

    private Vector2 inputVector;
    public Vector2 InputVector => inputVector; // Dùng để các script khác lấy giá trị

    public void OnPointerDown(PointerEventData eventData)
    {
        OnDrag(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        Vector2 pos;
        if (RectTransformUtility.ScreenPointToLocalPointInRectangle(joystickBackground.rectTransform, eventData.position, eventData.pressEventCamera, out pos))
        {
            pos.x = (pos.x / joystickBackground.rectTransform.sizeDelta.x);
            pos.y = (pos.y / joystickBackground.rectTransform.sizeDelta.y);

            inputVector = new Vector2(pos.x * 2 - 1, pos.y * 2 - 1);
            inputVector = (inputVector.magnitude > 1.0f) ? inputVector.normalized : inputVector;

            // Di chuyển handle của joystick
            joystickHandle.rectTransform.anchoredPosition = new Vector2(inputVector.x * (joystickBackground.rectTransform.sizeDelta.x / 2.5f), 
                                                                        inputVector.y * (joystickBackground.rectTransform.sizeDelta.y / 2.5f));
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        inputVector = Vector2.zero;
        joystickHandle.rectTransform.anchoredPosition = Vector2.zero;
    }
}