using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
/*******************************************************************************
*Create By CG
*Function 可移动控制的示例图版
*******************************************************************************/
namespace ZXK.ZPS
{
    public class SampleCtrl : MonoBehaviour
    {
        [SerializeField]
        private GameObject _canvas = null;
        [SerializeField]
        private string _checkGeoName = null;
        //镜头拉近速度
        private float _zoomSpeed = 30.0f;

        private Vector2 _curPos = Vector2.zero;

        private Vector3 _orgPos = Vector3.one;

        private void OnEnable()
        {
            transform.localScale = Vector3.one;
            _orgPos = transform.localPosition;
        }
        private void OnDisable()
        {
            transform.localScale = Vector3.one;
            transform.localPosition = _orgPos;
        }
        private void Update()
        {
            if (_canvas != null && !string.IsNullOrEmpty(_checkGeoName))
            {
                GameObject selectGeo = GetOverUI();
                if (selectGeo!=null&& selectGeo.name.Equals(_checkGeoName))
                {
                    //缩放
                    transform.localScale += Vector3.one * Input.mouseScrollDelta.y * Time.deltaTime * _zoomSpeed;
                    if (transform.localScale.x < 0.3f)
                    {
                        transform.localScale = Vector3.one * 0.3f;
                    }
                    //位移
                    if (Input.GetMouseButtonDown(1))
                    {
                        _curPos = Input.mousePosition;
                        Debug.Log("Down:" + _curPos);
                    }
                    else if (Input.GetMouseButton(1))
                    {
                        Vector2 movePos = (Vector2)Input.mousePosition - _curPos;
                        transform.GetComponent<RectTransform>().anchoredPosition += movePos;
                        _curPos = Input.mousePosition;
                        Debug.Log("Ing:" + _curPos);
                    }
                }
            }
           
        }

        public GameObject GetOverUI()
        {
            PointerEventData pointerEventData = new PointerEventData(EventSystem.current);
            pointerEventData.position = Input.mousePosition;
            GraphicRaycaster gr = _canvas.GetComponent<GraphicRaycaster>();
            List<RaycastResult> results = new List<RaycastResult>();
            gr.Raycast(pointerEventData, results);
            if (results.Count != 0)
            {
                return results[0].gameObject;
            }
            return null;
        }
    }
}