using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
/********************************************************************************
*Create By CG
*Function 摄像机环绕某个物体旋转展示
*********************************************************************************/
namespace ZXK.UTility
{
    public class CameraAroundCtrl : MonoBehaviour
    {
        /// <summary>
        /// 需要围绕的物体
        /// </summary>
        public Transform _CenObj;

        //private float _disCen;

        private void Update()
        {
            if (!EventSystem.current.IsPointerOverGameObject())
            {
                SetCamDistance();
                SetCamRotation();
            }
        }
        /// <summary>
        /// 设置摄像机距离物体远近
        /// </summary>
        private void SetCamDistance()
        {
            if(Input.GetAxis("Mouse ScrollWheel") > 0)
            {
                transform.Translate(Vector3.forward * 0.5f);
            }
            if (Input.GetAxis("Mouse ScrollWheel") < 0)
            {
                transform.Translate(Vector3.forward * -0.5f);
            }
        }
        /// <summary>
        /// 设置摄像机围绕物体旋转
        /// </summary>
        private void SetCamRotation()
        {
            float mouse_x = Input.GetAxis("Mouse X");
            float mouse_y = Input.GetAxis("Mouse Y");

            if (Input.GetKey(KeyCode.Mouse1))
            {
                transform.RotateAround(_CenObj.position, transform.up, mouse_x * 5);
                transform.RotateAround(_CenObj.position, transform.right, -mouse_y * 5);
            }
        }
    }
}