using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[RequireComponent(typeof(Image))]
public class ImageOp : MonoBehaviour, IBeginDragHandler, IDragHandler
{
    // Start is called before the first frame update
    public bool dragOnSurfaces = true;
    public float scaleSpeed = 0.01f;
    public float moveScale = 0.01f;

    private Vector2 startPostion;

    void Update()
    {
        float offset = Input.GetAxis("Mouse ScrollWheel");
        if (Input.GetAxis("Mouse ScrollWheel") != 0)
        {
            Debug.Log("ScrollWheel<0");
            float scale = transform.localScale.x + offset * scaleSpeed;
            ScaleImage(scale);
        }
    }
    public void OnBeginDrag(PointerEventData eventData)
    {
        startPostion = eventData.position;
    }

    public void OnDrag(PointerEventData eventData)
    {
        //if (m_DraggingIcons[eventData.pointerId] != null)
        //    SetDraggedPosition(eventData);
        transform.position += new Vector3(eventData.delta.x, eventData.delta.y,0) * moveScale;
    }

    public void AddScale(float offset)
    {
        float scale = transform.localScale.x + offset;
        ScaleImage(scale);
    }

    private void ScaleImage(float s)
    {
        float scale = Mathf.Clamp(s, 0.3f, 10);
        transform.localScale = new Vector3(scale, scale, scale);
    }
}