手势控制相机平移缩放功能

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

/*************************************************************
* 场景相关
*************************************************************/
public class TileCamera : MonoBehaviour
{
    public static bool isMove = false;
    private static Touch oldTouch1;  //上次触摸点1(手指1)
    private static Touch oldTouch2;  //上次触摸点2(手指2)

    /// <summary>
    /// 相机平移
    /// </summary>
    public static void MoveView(Camera Camera)
    {
        if (Input.touchCount == 1)
        {
            var deltaposition = Input.GetTouch(0).deltaPosition;
            Camera.transform.Translate(-deltaposition.x * Time.deltaTime, -deltaposition.y * Time.deltaTime, 0, Space.World);
            Camera.transform.position = new Vector3(Mathf.Clamp(Camera.transform.position.x, -20f, 20f), Mathf.Clamp(Camera.transform.position.y, -1f, 20f), Camera.transform.position.z);
        }
    }


    /// <summary>
    /// 处理视野的拉近和拉远效果
    /// </summary>
    public static void ScrollView()
    {
        //没有触摸，就是触摸点为0
        if (Input.touchCount <= 0)
        {
            return;
        }

        if (Input.touchCount == 2)
        {
            //多点触摸, 放大缩小
            Touch newTouch1 = Input.GetTouch(0);
            Touch newTouch2 = Input.GetTouch(1);
            //第2点刚开始接触屏幕, 只记录，不做处理
            if (newTouch2.phase == TouchPhase.Began)
            {
                oldTouch2 = newTouch2;
                oldTouch1 = newTouch1;
                return;
            }
            //计算老的两点距离和新的两点间距离，变大要放大模型，变小要缩放模型
            float oldDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);
            float newDistance = Vector2.Distance(newTouch1.position, newTouch2.position);
            //两个距离之差，为正表示放大手势， 为负表示缩小手势
            float offset = newDistance - oldDistance;
            //放大因子， 一个像素按 0.01倍来算(100可调整)
            float scaleFactor = offset / 100f;
            //在什么情况下进行缩放
            Camera.main.orthographicSize -= scaleFactor;
            Camera.main.orthographicSize = Mathf.Clamp(Camera.main.orthographicSize, 2f, 10f);

            //记住最新的触摸点，下次使用
            oldTouch1 = newTouch1;
            oldTouch2 = newTouch2;
        }
    }



}