Nhận diện cử chỉ (Swipe, Pinch, Tap)

using UnityEngine;
using UnityEngine.Events;

public class SwipeInput : MonoBehaviour
{
    public UnityEvent OnSwipeLeft, OnSwipeRight, OnSwipeUp, OnSwipeDown;
    public UnityEvent<float> OnPinch; // Gửi đi giá trị delta
    public UnityEvent OnTap;

    private Vector2 touchStartPos;
    private Vector2 touchEndPos;
    private float minSwipeDistance = 50f;

    void Update()
    {
        // Xử lý Tap & Swipe
        if (Input.touchCount == 1)
        {
            Touch touch = Input.GetTouch(0);
            if (touch.phase == TouchPhase.Began) {
                touchStartPos = touch.position;
            }
            else if (touch.phase == TouchPhase.Ended) {
                touchEndPos = touch.position;
                float distance = Vector2.Distance(touchStartPos, touchEndPos);

                if (distance < minSwipeDistance) {
                    OnTap?.Invoke();
                } else {
                    HandleSwipe();
                }
            }
        }

        // Xử lý Pinch to Zoom
        if (Input.touchCount == 2)
        {
            Touch touchZero = Input.GetTouch(0);
            Touch touchOne = Input.GetTouch(1);

            Vector2 touchZeroPrevPos = touchZero.position - touchZero.deltaPosition;
            Vector2 touchOnePrevPos = touchOne.position - touchOne.deltaPosition;

            float prevMagnitude = (touchZeroPrevPos - touchOnePrevPos).magnitude;
            float currentMagnitude = (touchZero.position - touchOne.position).magnitude;

            float difference = currentMagnitude - prevMagnitude;
            OnPinch?.Invoke(difference);
        }
    }

    void HandleSwipe()
    {
        float swipeX = touchEndPos.x - touchStartPos.x;
        float swipeY = touchEndPos.y - touchStartPos.y;

        if (Mathf.Abs(swipeX) > Mathf.Abs(swipeY)) // Swipe ngang
        {
            if (swipeX > 0) OnSwipeRight?.Invoke();
            else OnSwipeLeft?.Invoke();
        }
        else // Swipe dọc
        {
            if (swipeY > 0) OnSwipeUp?.Invoke();
            else OnSwipeDown?.Invoke();
        }
    }
}