Unity3D鼠标拖拽播放循环序列

鼠标拖拽，通过计算鼠标坐标和按下时的坐标判断播放的序列帧，一定时间无操作自动播放序列。

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

public class RotateBuildnew : MonoBehaviour
{
   
    //序列载体
    public Image image;
    //序列
    public Sprite[] sprit_arr;
    //当前序列位置
    private int index;
    private float oriX;
    private int offset;
    private int currentIndex = 0;

    //速度控制
    private int delta = 10;

    //无操作时间
    private float noOperate = 0;
    //是否开始计时
    private