[Unity]在TileMap上控制Camera移动、缩放

环境：

1. unity2021.3.14f1c1
2. Camera类型Orthographic
3. TileMap为XY方向摆放

功能：

1. 单点触摸或鼠标操作移动Camera。
2. 使用BoxCollider2D控制地图范围。
3. 鼠标滚轮或多点触摸控制缩放。
4. 缩放维持中心点在屏幕的固定位置。

代码：

using System;
using UnityEngine;

public class TileMapCameraController : MonoBehaviour
{
    [SerializeField]
    GameObject targetMap;
    [SerializeField]
    Camera targetCam;

    private bool enableControl = true;
    private float camInitSize = 20;
    private float camMinSize = 5;
    private float camMaxSize = 30;
    private float camSizeScrollWheelV = 10;

    private Vector2 firstTouchPos;
    private Vector2 cameraFirstPos;
    private bool isMoving = false;
    private bool isBegan = false;
    private bool isOnScale = false;
    private float camOriginZ = 0;
    private Vector3 mapMin;
    private Vector3 mapMax;
    private Vector3 camNewPos = new Vector3();

    // 双触点初始距离
    private float baseDis;
    // 双触点初始中心
    private Vector2 baseMidScreen;
    // 双触点初始中心
    private Vector3 baseMidWorld;
    // 双触点初始镜头size
    private float baseSize;
    private float baseScale = 1;

    void Awake()
    {
        Init();
    }

    private void Init()
    {
        if (targetMap)
        {
            var bounds = targetMap.GetComponent<BoxCollider2D>().bounds;
            mapMax = bounds.max;
            mapMin = bounds.min;
        }
        if (targetCam)
        {
            targetCam.orthographicSize = camInitSize;
            c