using DG.Tweening;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEngine;

public class ScrollImage : MonoBehaviour
{
    [SerializeField]
    private float m_PerImageSize;

    [SerializeField]
    private float m_PerImageSpace;

    [SerializeField]
    private int m_ImageCount;

    private int nowImageIndex = 0;

    private float jumpTime = 3;
    private float realTime = 3;

    private RectTransform m_RectTrans;

    private float m_TargetPosX = 0;
    // Start is called before the first frame update
    void Start()
    {
        realTime = Time.time;
        m_RectTrans = GetComponent<RectTransform>(); 
    }

    // Update is called once per frame
    void Update()
    {
        float a = Time.time - realTime;
        if(a >= jumpTime)
        {
            realTime = Time.time;
            //切换
            nowImageIndex++;
            if(nowImageIndex >= m_ImageCount)
            {
                nowImageIndex = 0;
            }
            JumpToIndex();
        }
    }

    /// <summary>
    /// 跳转到对应的章节
    /// </summary>
    private void JumpToIndex()
    {
        float posY = m_RectTrans.anchoredPosition.x;//当前尺寸
        m_TargetPosX = posY - m_PerImageSize - m_PerImageSpace;
        if(m_TargetPosX < -(m_PerImageSize * m_ImageCount))
        {
            m_TargetPosX = 0;
        }
        m_RectTrans.DOAnchorPosX(m_TargetPosX, 0.6f);
    }
}