using UnityEngine;
using UnityEngine.UI;

public class PinchToZoom : MonoBehaviour
{
    public float minScale = 0.5f; // Minimum scale of the image
    public float maxScale = 3f;   // Maximum scale of the image

    private Vector2 initialTouch1;
    private Vector2 initialTouch2;
    private float initialDistance;
    private Vector3 initialScale;

    void Update()
    {
        // Check for two touches
        if (Input.touchCount == 2)
        {
            Touch touch1 = Input.GetTouch(0);
            Touch touch2 = Input.GetTouch(1);

            // Handle the initial touch points
            if (touch1.phase == TouchPhase.Began || touch2.phase == TouchPhase.Began)
            {
                initialTouch1 = touch1.position;
                initialTouch2 = touch2.position;
                initialDistance = Vector2.Distance(initialTouch1, initialTouch2);
                initialScale = transform.localScale;
            }
            // Handle the pinch gesture
            else if (touch1.phase == TouchPhase.Moved || touch2.phase == TouchPhase.Moved)
            {
                Vector2 currentTouch1 = touch1.position;
                Vector2 currentTouch2 = touch2.position;
                float currentDistance = Vector2.Distance(currentTouch1, currentTouch2);

                // Calculate the scale factor
                float scaleFactor = currentDistance / initialDistance;

                // Apply the scale factor
                Vector3 newScale = initialScale * scaleFactor;

                // Clamp the scale to min and max values
                newScale.x = Mathf.Clamp(newScale.x, minScale, maxScale);
                newScale.y = Mathf.Clamp(newScale.y, minScale, maxScale);
                newScale.z = 1f; // Ensure the Z scale remains unchanged

                // Apply the new scale to the image
                transform.localScale = newScale;
            }
        }
    }
}