unity中实现百度本地瓦片地图生成地图与坐标转换

最新推荐文章于 2024-07-30 18:36:42 发布

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最新推荐文章于 2024-07-30 18:36:42 发布

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分类专栏： untiy

本文链接：https://blog.youkuaiyun.com/qq_35080168/article/details/106073143

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第一步, 获取百度瓦片地图,下载到本地

网上有很多相关的工具自行查找一个使用即可

实在懒得找的我把我用的分享出来:https://download.youkuaiyun.com/download/qq_35080168/12411438

然后查看本地的地图目录结构. 搞清楚目录接口之后, 之后加载图片的路径问题就搞定了

如下图大概的目录结构 1-18级地图每一级内的文件夹名称是行数打开进去的图名称是列数

也就是说每一片的瓦片地图层级+行数+列数是唯一的这就好办了

第二步,写一个读取本地地图的类

坐标的问题后边再说

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

/// <summary>
/// 地图图片管理
/// </summary>
public class MapTextureManager : MonoBehaviour
{
    //避免重复加载  搞一个缓存
    private Dictionary<string, Sprite> Sprites = new Dictionary<string, Sprite>();
    public MapAxesTransfer mapAxesTransfer;
    private List<LoadTextureInfo> LoadInfos = new List<LoadTextureInfo>();

    /// <summary>
    /// 图片地址拼接
    /// </summary>
    /// <param name="zoom">层级</param>
    /// <param name="pieceX">行数</param>
    /// <param name="pieceY">列数</param>
    /// <returns></returns>
    string StitchingPath(int zoom,float pieceX,float pieceY)
    {
        return @"file:///D:/TaiAnGround/maptile/" + zoom + "/" + (int)pieceX + "/" + (int)pieceY + ".png";
    }
    /// <summary>
    /// 预加载
    /// </summary>
    /// <param name="Pieces">加载中心的块坐标</param>
    public void Preload(Dictionary<int, List<Vector2>> Pieces)
    {
        //先加载小层级
        Dictionary<int, Vector4> zoomToLRPiece = mapAxesTransfer.ZoomToLRPiece(10, 15);
        foreach (var key in zoomToLRPiece.Keys)
        {
            Vector4 bound = zoomToLRPiece[key];
            Vector2 left = new Vector2(bound.x, bound.y);
            Vector2 right = new Vector2(bound.z, bound.w);
            for (int i = (int)left.x; i < right.x + 1; i++)
            {
                for (int j = (int)left.y; j < right.y + 1; j++)
                {
                    string path = StitchingPath(key, i, j);
                    LoadTextureInfo info = new LoadTextureInfo(path, null);
                    LoadInfos.Add(info);
                }
            }
        }
        //加载附近层级以及大层级
        foreach (int zoom in Pieces.Keys)
        {
            foreach (var piece in Pieces[zoom])
            {
                string path = StitchingPath(zoom, piece.x, piece.y);
                LoadTextureInfo info = new LoadTextureInfo(path,null);
                LoadInfos.Add(info);
            }
        }
        LoadSingle();
    }

    /// <summary>
    /// 队列内添加一个加载任务
    /// </summary>
    public void AddLoadTask(int zoom, float pieceX, float pieceY, Action<Sprite> setSprite)
    {
        string path = StitchingPath(zoom, pieceX, pieceY);
        if (Sprites.ContainsKey(path))
        {
            setSprite(Sprites[path]);
        }
        else
        {
            LoadTextureInfo info = new LoadTextureInfo(path, setSprite);
            if (LoadInfos.Count == 0)
            {
                if (!LoadInfos.Contains(info))
                {
                    LoadInfos.Add(info);
                    LoadSingle();
                }
            }
            else
            {
                LoadInfos.Add(info);
            }
        }
       

    }
    /// <summary>
    /// 开始加载
    /// </summary>
    void LoadSingle()
    {
        if (LoadInfos.Count > 0)
            StartCoroutine(LoadSpritebywww(LoadInfos[0]));
        else
            Resources.UnloadUnusedAssets();
    }

    private IEnumerator LoadSpritebywww(LoadTextureInfo info)
    {
        using (WWW www = new WWW(info.path))
        {
            yield return www;
            if (www.isDone)
            {
                if (string.IsNullOrEmpty(www.error))
                {
                    var sprite = Sprite.Create(www.texture, new Rect(0, 0, 256, 256), new Vector2(0, 0), 100);
                    if (info.setSprite != null)
                        info.setSprite(sprite);
                    Sprites[info.path] = sprite;
                }
                else
                {
                    WD_Debug._Print("错误:  "+www.error);
                }
                if (LoadInfos.Count > 0) LoadInfos.RemoveAt(0);
                LoadSingle();
            }
        }
        
      
    }
    public class LoadTextureInfo
    {
        public string path;
        public Action<Sprite> setSprite;
        public LoadTextureInfo(string path,Action<Sprite> act)
        {
            this.path = path;
            setSprite = act;
        }
    }
}

第三,坐标转换

这里要说到几个坐标系和他们之间的关系

经纬度坐标系

经线的定义:地球表面连接南北两极的大圆线上的半圆弧,任两根经线的长度相等
纬度的定义:地球表面某点随地球自转所形成的轨迹。任何一根纬线都是圆形而且两两平行。纬线的长度是赤道的周长乘以纬线的纬度的余弦，所以赤道最长，离赤道越远的纬线，周长越短，到了两极就缩为0

墨卡托坐标/平面坐标

百度提供了经纬度坐标和墨卡托坐标转换的方法我们拿来直接用,经纬度要先转换成墨卡托坐标才能拿来计算转换坐标,原因是经纬度表示的是个球,直接以经纬度去计算距离是肯定有偏差的.

像素坐标

在18级地图下像素坐标等于墨卡托坐标,17级就要除以2 16级除以4以此类推,基于此就可以计算出经纬度对应的块坐标,

块坐标

就是下载的瓦片地图图片的行列数坐标, 我写的方法是以中心图块为基准查找周围图块的根据块坐标的原理查找周围图块就很简单了

世界坐标

图块在unity 的世界坐标,以块坐标左下角的那个图块作为000点.又知道每一块图块的unity内的长度,基于此可以计算出任意层级下任意图块的unity世界坐标

一个图块(使用的是spriterenderer组件) 的大小计算方式: 每单位像素量除以分辨率每单位像素量就是下边截图中的属性,分辨率是已知的

米坐标

同理的,在由一个点已知的经纬度坐标和米坐标以及偏移量计算出的坐标可以用来测距两点之间实际距离

好的搞清楚他们之间的关系一切都好办了

这是百度提供的坐标转换方法

里边有一堆乱七八糟的参数咱也不是很懂.但能用就行了

计算的时候大多数时候 float的精度是不够的所以下边定义了一个double类型的vector2

using System;
using System.Collections.Generic;

/// <summary>
/// 经纬度墨卡托转换
/// </summary>
public class MCObject
{
    public MCObject()
    {
        
    }
    //经纬度 偏移一定的像素量 取另一个经纬度
    public Vector2D Point_Offset(double lng, double lat, double offx, double offy, int zoom)
    {
        //经纬度转墨卡托
        var re = convertLL2MC(lng, lat);
        //转换到zoom级别下
        re.x *= Math.Pow(2, zoom - 18);
        re.y *= Math.Pow(2, zoom - 18);
        //像素坐标
        re.x += offx/*/2*/;//256
        re.y += offy/*/2*/;
        //转回平面坐标
        //像素坐标.
        re.x /= Math.Pow(2, zoom - 18);
        re.y /= Math.Pow(2, zoom - 18);
        //转回经纬度
        convertMC2LL(re.x, re.y);
        re.x = Longitude;
        re.y = Latitude;
        return re;
    }

    static double DEF_PI = 3.14159265359; // PI
    static double DEF_2PI = 6.28318530712; // 2*PI
    static double DEF_PI180 = 0.01745329252; // PI/180.0
    static double DEF_R = 6370693.5; // radius of earth

    //适用于近距离 求两个经纬度之间的实际距离
    public static double GetShortDistance(double lon1, double lat1, double lon2, double lat2)
    {
        double ew1, ns1, ew2, ns2;
        double dx, dy, dew;
        double distance;
        // 角度转换为弧度
        ew1 = lon1 * DEF_PI180;
        ns1 = lat1 * DEF_PI180;
        ew2 = lon2 * DEF_PI180;
        ns2 = lat2 * DEF_PI180;
        // 经度差
        dew = ew1 - ew2;
        // 若跨东经和西经180 度，进行调整
        if (dew > DEF_PI)
            dew = DEF_2PI - dew;
        else if (dew < -DEF_PI)
            dew = DEF_2PI + dew;
        dx = DEF_R * Math.Cos(ns1) * dew; // 东西方向长度(在纬度圈上的投影长度)
        dy = DEF_R * (ns1 - ns2); // 南北方向长度(在经度圈上的投影长度)
        // 勾股定理求斜边长
        distance = Math.Sqrt(dx * dx + dy * dy);
        return distance;
    }
    /// <summary>
    /// 经纬度坐标和墨卡托坐标互转 
    /// </summary>
    /// <param name="x"></param>
    /// <param name="y"></param>
    /// <param name="OutLongitudeAndLatitude">trueMC坐标转经纬度,false经纬度转MC坐标</param>
    public MCObject(double x, double y, bool OutLongitudeAndLatitude = false)
    {

        if (OutLongitudeAndLatitude)
        {
            _MCx = x;
            _MCy = y;

            convertMC2LL(_MCx, _MCy);
        }
        else
        {
            _Longitude = x;
            _Latitude = y;

            convertLL2MC(_Longitude, _Latitude);
        }

    }

    private double _MCx;
    private double _MCy;

    public double MCx
    {
        get
        {
            return _MCx;
        }
        set { _MCx = value; }
    }

    public double MCy
    {
        get
        {
            return _MCy;
        }
        set { _MCy = value; }
    }


    public double _Longitude;
    public double _Latitude;

    public double Longitude
    {
        get
        {

            if (_Longitude != null)
            {

                return _Longitude;
            }
            else
            {
                return 0;
            }
        }

        set { _Longitude = value; }
    }

    public double Latitude
    {
        get
        {

            if (_Latitude != null)
            {

                return _Latitude;
            }
            else
            {
                return 0;
            }
        }
        set { _Latitude = value; }
    }

    private List<List<double>> LL2MC = new List<List<double>>(){new List<double>(){-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5},
       new List<double>() {0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167,  -5124939663.577472, 913311935.9512032, 67.5},
       new List<double>() {0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5},
       new List<double>() {0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5},
       new List<double>() {-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5},
       new List<double>() {-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45}
            };
    private List<List<double>> MC2LL = new List<List<double>>() { new List<double>() { 1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2 }, new List<double>() { -7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86 }, new List<double>() { -3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37 }, new List<double>() { -1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06 }, new List<double>() { 3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4 }, new List<double>() { 2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5 } };
    private Double[] MCBAND = { 12890594.86, 8362377.87, 5591021d, 3481989.83, 1678043.12, 0d };
    private int[] LLBAND = { 75, 60, 45, 30, 15, 0 };
    private double getRange(double cf, double ce, double t)
    {
        if (ce != 0)
        {
            cf = cf > ce ? cf : ce;
        }
        if (t != 0)
        {
            cf = cf > t ? t : cf;
        }
        return cf;
    }

    private double getLoop(double cf, double ce, double t)
    {
        while (cf > t)
        {
            cf -= t - ce;
        }
        while (cf < ce)
        {
            cf += t - ce;
        }
        return cf;
    }

    private Vector2D convertor(double longitude, double latitude, double[] cg)
    {
        if (cg == null)
        {
            return null;
        }
        double t = cg[0] + cg[1] * longitude;
        double ce = Math.Abs(latitude) / cg[9];
        double ch = cg[2] + cg[3] * ce + cg[4] * Math.Pow(ce, 2) + cg[5] * Math.Pow(ce, 3) + cg[6] * Math.Pow(ce, 4) + cg[7] * Math.Pow(ce, 5) + cg[8] * Math.Pow(ce, 6);
        t = t * (longitude < 0 ? -1 : 1);
        ch = ch * (latitude < 0 ? -1 : 1);

        var re = new Vector2D(t,ch);
        //re.Item1 = t;
        //re.Item2 = ch;
        return re;
    }

    //经纬度转墨卡托坐标
    public Vector2D convertLL2MC(double longitude, double latitude)
    {
        try
        {
            longitude = getLoop(longitude, -180, 180);
            latitude = getRange(latitude, -74, 74);

            int countLLBAND = 7;
            double[] cg = null;
            for (int cf = 0; cf < countLLBAND; cf++)
            {
                if (latitude >= LLBAND[cf])
                {
                    cg = LL2MC[cf].ToArray();
                    break;
                }
            }
            if (cg == null)
            {
                for (int cf = countLLBAND - 1; cf >= 0; cf--)
                {
                    if (longitude <= -LLBAND[cf])
                    {
                        cg = LL2MC[cf].ToArray();
                        break;
                    }
                }
            }

            Vector2D result = convertor(longitude, latitude, cg);
            _MCx = result.x;
            _MCy = result.y;
            return result;
        }
        catch (System.Exception ex)
        {
            Vector2D result = new Vector2D(); ;
            //result.Item1 = 0;
            //result.Item2 = 0;
            return result;

        }
    }

    //墨卡托坐标转经纬度坐标
    public Vector2D convertMC2LL(double x, double y)
    {
        try
        {
            double[] cF = null;
            x = Math.Abs(x);
            y = Math.Abs(y);

            for (int cE = 0; cE < MCBAND.Length; cE++)
            {
                if (y >= MCBAND[cE])
                {
                    cF = MC2LL[cE].ToArray();
                    break;
                }
            }
            Vector2D result = convertor(x, y, cF);
            _Longitude = result.x;
            _Latitude = result.y;
            return result;
        }
        catch (System.Exception ex)
        {
            _Longitude = 0;
            _Latitude = 0;
            return new Vector2D();
        }
    }
}

/// <summary>
/// double类型的一个vector2
/// </summary>
public class Vector2D
{
    /// <summary>
    /// 如果是经纬度  lat值
    /// </summary>
    public double x;
    /// <summary>
    /// 如果是经纬度  lng值
    /// </summary>
    public double y;

    public Vector2D()
    {
        x = 0;
        y = 0;
    }
    public Vector2D(double X, double Y)
    {
        x = X;
        y = Y;
    }
}

然后是各种坐标之间的转换

需要拿到下载地图的时候左下角和右上角的经纬度,

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

//地图坐标轴转换
public class MapAxesTransfer : MonoBehaviour
{
    public static MapAxesTransfer ins;
  //  public MapPicData mapPicData = new MapPicData();
    MCObject MC = new MCObject();
    public int zoom = 17;
    /// <summary>
    /// 图片大小 分辨率
    /// </summary>
    public Vector2 picSize = new Vector2(256, 256);
    /// <summary>
    /// 图片的每单位像素  图片资源的设置
    /// </summary>
    public int PixelsPerUnit = 100;
    #region 初始坐标
    public Vector2D InitleftLL
    {
        get
        {
            return new Vector2D()
            {
                x = 左下角经度,
                y = 左下角纬度,
            };
        }
    }
    public Vector2D rightLL
    {
        get
        {
            return new Vector2D()
            {
                x = 右上角经度,
                y = 右上角纬度,
            };
        }
    }
    public double 左下角经度 = 117.811422d, 左下角纬度 = 36.655215d;//117.811422d, 36.655215d
    public double 右上角经度 = 118.214941d, 右上角纬度 = 36.888737d;//118.214941d, 36.888737d
    #endregion



    public Vector2D leftLL = new Vector2D();
    //左下角的MC坐标
    public Vector2D leftDownMC = new Vector2D();
    //全图左下角块坐标
    public Vector2 leftPiece;
    public Vector2 rightPiece;
    /// <summary>
    /// 单个图块unity世界坐标的长度
    /// </summary>
    public float pixel;
    /// <summary>
    /// 单块平面坐标长度
    /// </summary>
    double pieceLengh;
    public Vector3 GetRightPos()
    {
        return new Vector3(rightPiece.x - leftPiece.x, 20, rightPiece.y - leftPiece.y) * pixel;
    }
    public void Init()
    {
        ins = this;
        pixel = picSize.x / PixelsPerUnit;
        leftDownMC = MC.convertLL2MC(InitleftLL.x, InitleftLL.y);
        leftPiece = LLToPiece(InitleftLL, zoom);
        rightPiece = LLToPiece(rightLL, zoom);
        ChangeLayer(zoom);
        WD_Debug._Print(Math.Pow(2, zoom - 18));
        //MCToWorld(null);
        TestSet();
    }
    //更换层级 一些东西要重新计算定义
    public void ChangeLayer(int zoom)
    {
        this.zoom = zoom;
        leftPiece = LLToPiece(InitleftLL, zoom);
        rightPiece = LLToPiece(rightLL, zoom);
        pieceLengh = picSize.x / Math.Pow(2, zoom - 18);

        WD_Debug._Print("左下角1  " + leftPiece + "  单块平面坐标的长度" + pieceLengh + "   左下角MC   " + leftDownMC.x);
        //下边两行先后顺序不能变 否则计算有误差  计算的时候是以leftDownMC为基准计算的   leftDownMC必须由修正后的经纬度计算
        ReSetLL();//修正经纬度
        TestSet();
    }
    //测试 更换层级之后的参考点位置
    GameObject g;
    void TestSet()
    {
        Vector2D mcpos = MC.convertLL2MC(referencePointLngLat.x, referencePointLngLat.y);
        Vector3 world = MCToWorld(mcpos);
        if (g == null)
            g = new GameObject("参考点");

        g.transform.position = world;
    }

    //修正经纬度到左下角 原因 : 在网页上取的经纬度 和实际上左下角块坐标的经纬度肯定是有偏差的, 需要重新计算
    private void ReSetLL()
    {
        //块坐标转平面坐标  块坐标乘以ppu
        Vector2D mcPos = new Vector2D()
        {
            x = leftPiece.x * picSize.x + 1,
            y = leftPiece.y * picSize.x + 1
        };
        mcPos.x /= Math.Pow(2, zoom - 18);
        mcPos.y /= Math.Pow(2, zoom - 18);
        //MC坐标转经纬度
        leftLL = MC.convertMC2LL(mcPos.x, mcPos.y);
    }

    //取层级对应的所有块坐标的左下角和右上角
    public Dictionary<int, Vector4> ZoomToLRPiece(int startZoom, int endZoom)
    {
        Dictionary<int, Vector4> zoomtoPiece = new Dictionary<int, Vector4>();
        for (int i = startZoom; i < endZoom; i++)
        {
            zoomtoPiece[i] = new Vector4()
            {
                x = LLToPiece(InitleftLL, i).x,
                y = LLToPiece(InitleftLL, i).y,
                z = LLToPiece(rightLL, i).x,
                w = LLToPiece(rightLL, i).y,
            };
        }
        // WD_Debug._Error(zoomtoPiece.Count);
        return zoomtoPiece;
    }
    //取一个坐标附近各个层级的块坐标
    public Dictionary<int, List<Vector2>> PieceToZoom(Vector2 CenterPiece, int zoom)
    {
        Dictionary<int, List<Vector2>> zoomtoPiece = new Dictionary<int, List<Vector2>>();
        for (int i = 15; i < 18 + 1; i++)
        {
            float coe = (float)Math.Pow(2, zoom - i);
            Vector2 newPiece = new Vector2((int)(CenterPiece.x / coe),
                (int)(CenterPiece.y / coe));
            //  WD_Debug._Print(zoom + "   " + i + "   新中点" + newPiece + "系数?   " + (float)Math.Pow(2, zoom - i));
            zoomtoPiece[i] = GetDic(newPiece, new Vector2(10, 10));
        }
        return zoomtoPiece;
    }
    List<Vector2> GetDic(Vector2 CenterPiece, Vector2 colraw)
    {
        List<Vector2> ListPieces = new List<Vector2>();
        for (int i = 1; i < ((int)(colraw.x / 2)) + 1; i++)
        {
            for (int j = 1; j < ((int)(colraw.y / 2)) + 1; j++)
            {
                ListPieces.Add(CenterPiece + new Vector2(i, j));
                ListPieces.Add(CenterPiece + new Vector2(i, -j));
                ListPieces.Add(CenterPiece + new Vector2(-i, -j));
                ListPieces.Add(CenterPiece + new Vector2(-i, j));
                ListPieces.Add(CenterPiece + new Vector2(-i, 0));
                ListPieces.Add(CenterPiece + new Vector2(i, 0));
                ListPieces.Add(CenterPiece + new Vector2(0, -j));
                ListPieces.Add(CenterPiece + new Vector2(0, j));

            }
        }
        return ListPieces;
    }

    /// <summary>
    /// 经纬度取块坐标
    /// </summary>
    public Vector2 LLToPiece(Vector2D LL, int Zoom)
    {
        //先转墨卡托坐标
        Vector2D piece = MC.convertLL2MC(LL.x, LL.y);
        //转换到zoom级别下
        piece.x *= Math.Pow(2, Zoom - 18);
        piece.y *= Math.Pow(2, Zoom - 18);
        //墨卡托取块坐标
        return new Vector2((int)(piece.x / picSize.x), (int)(piece.y / picSize.x));
    }

    /// <summary>
    /// 世界坐标转经纬度
    /// </summary>
    /// <returns></returns>
    public Vector2D WorldToLL(Vector3 worldPos)
    {
        //计算偏移像素量 世界坐标乘以ppu 
        Vector2D MCOffset = new Vector2D()
        {
            x = worldPos.x * PixelsPerUnit,
            y = worldPos.z * PixelsPerUnit,
        };
        return MC.Point_Offset(leftLL.x, leftLL.y, MCOffset.x, MCOffset.y, zoom);
    }

    /// <summary>
    /// 经纬度转世界坐标
    /// </summary>
    public Vector3 LLToWorld(Vector2D LL)
    {
        Vector2D TempMC = MC.convertLL2MC(LL.x, LL.y);
        Vector3 world = MCToWorld(TempMC);
        return world;
    }

    /// <summary>
    /// 世界坐标转墨卡托坐标  
    /// </summary>
    public Vector2D WorldToMC(Vector3 worldPos)
    {
        Vector2D LL = WorldToLL(worldPos);
        Vector2D leftDownMCs = MC.convertLL2MC(LL.x, LL.y);
        return leftDownMCs;
    }

    /// <summary>
    /// 墨卡托转世界坐标
    /// </summary>
    public Vector3 MCToWorld(Vector2D MC)
    {
        string[] X = (MC.x / pieceLengh).ToString().Split('.');
        string[] Y = (MC.y / pieceLengh).ToString().Split('.');
        //小数点之前的是块坐标
        long pieceX = long.Parse(X[0]);
        long pieceY = long.Parse(Y[0]);
        Vector2 piecePos = new Vector2(pieceX, pieceY);
        double s = MC.x / pieceLengh;
        //小数点之后的是偏移量
        float ratioX = float.Parse("0." + X[1]);
        float ratioY = float.Parse("0." + Y[1]);
        //块偏移量 
        Vector2 offsettt = (piecePos - leftPiece);
        Vector3 center = new Vector3(ratioX + offsettt.x, 0, ratioY + offsettt.y);
        center *= pixel;
        return center;

    }

    /// <summary>
    /// 墨卡托转块
    /// </summary>
    public Vector2 MCToPiece(Vector2D centerMC)
    {

        WD_Debug._Print("zoom = " + zoom + "   " + Math.Pow(2, zoom - 18) + "    " + centerMC.x);

        centerMC.x *= Math.Pow(2, zoom - 18);
        centerMC.y *= Math.Pow(2, zoom - 18);
        //墨卡托取块坐标
        return new Vector2((int)(centerMC.x / picSize.x), (int)(centerMC.y / picSize.x));
    }


    /// <summary>
    /// 米坐标转世界坐标
    /// </summary>
    public Vector3 CMToWorld(float x, float y)
    {
        //转经纬度
        Vector2D LL = CMToLatLng(x, y);
        //经纬度转世界坐标
        Vector2D MCs = MC.convertLL2MC(LL.x, LL.y);
        if (MCs.x == 0) return new Vector3();

        return MCToWorld(MCs);
    }

    //参考点
    private Vector2D referencePointLngLat = new Vector2D()
    {
        x = 118.050357d,
        y = 36.860605d
    };
    //米坐标
    private Vector2D referencePointXY = new Vector2D()
    {
        x = -3576280,
        y = -1258750,
    };

    /// <summary>
    /// 米坐标 转经纬度
    /// </summary>
    public Vector2D CMToLatLng(float x, float y)
    {
        double Dx = x * 10.0f - referencePointXY.x / 1000.0f;
        double Dy = y * 10.0f - referencePointXY.y / 1000.0f;

        double c = 6371393f * 2f * Math.PI;
        double ss = c * Math.Cos(referencePointLngLat.y * Mathf.Deg2Rad);//当前纬度的周长
        double d_m = 360f / ss;//度每米

        double cd = 360f / c;//赤道度每米
        Vector2D LL = new Vector2D()
        {
            //经度
            x = Dx * d_m + referencePointLngLat.x,
            //纬度
            y = Dy * cd + referencePointLngLat.y
        };
        return LL;
    }
}

转换的方法写好了终于要到了使用的时候了

上代码

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

public class MapManager : MonoBehaviour
{
    public static MapManager ins;
    [Header("是否打开日志")]
    public bool isDebug = false;
    public Dictionary<Vector2, TempPic> tempPics = new Dictionary<Vector2, TempPic>();
    public int zoom = 15;
    private MCObject MC = new MCObject();
    public MapAxesTransfer mapAxesTransfer;
    private MapTextureManager LoadTexture;
    /// <summary>
    /// 尺寸
    /// </summary>
    private Vector2 numSize;

    [Header("初始化后视角是否在中心")]
    public bool iscenter;

    void Start()
    {
        WD_Debug.ins = isDebug;
        ins = this;
        mapAxesTransfer = GetComponentInChildren<MapAxesTransfer>();
        LoadTexture = GetComponent<MapTextureManager>();
        mapAxesTransfer.Init();
        int sizes = (int)(1920 / mapAxesTransfer.picSize.x);
        numSize = new Vector2(sizes + 3, sizes + 3);//决定地图几圈的地方
        WD_Debug._Print("计算排列  " + numSize + "   " + Screen.width);
        //InitMap();
        InitMap(iscenter);
    }

    Vector2D CameraLL;
    //更换层级
    public void ChangeLayer(int zoom)
    {
        Vector3 Screensize = new Vector3(Screen.width / 2, Screen.height / 2);
        ray = Camera.main.ScreenPointToRay(Screensize);
        if (Physics.Raycast(ray, out hit)) //
        {
            //换之前先记录下当前中心位置的平面坐标   换之后 没有正确的块坐标不好找
            Vector2D centerMC = mapAxesTransfer.WorldToMC(hit.point);
            CameraLL = mapAxesTransfer.WorldToLL(hit.point);
            //WD_Debug._Print("换之前的MC坐标" + centerMC.x + "   " + centerMC.y);
            this.zoom = zoom;
            mapAxesTransfer.ChangeLayer(zoom);//这里已经将左下角块坐标重新计算了
            tempPics.Remove(centerTemppic.PieceCoordinates);//这里删除之前的中心位置  后边设置得是新的中心块
            centerTemppic.PieceCoordinates = mapAxesTransfer.MCToPiece(centerMC);

            //计算出下一个中心快的坐标之后  在计算其位置 以左下角为00点结算
            Vector2 offset = centerTemppic.PieceCoordinates - mapAxesTransfer.leftPiece;
            Vector3 InitPosition = new Vector3(offset.x, 0, offset.y);
            InitPosition *= mapAxesTransfer.pixel;
           // WD_Debug._Print("转换之后的块坐标" + centerTemppic.PieceCoordinates + " 坐标差 " + offset + "  位置" + InitPosition);
            centerTemppic.transform.position = InitPosition;
            centerTemppic.isUpdate = true;
            centerPos = centerTemppic.PieceCoordinates;
            InitMap(true,true);
        }
    }
    Camera cameramain;

    public void SetMapEnable(bool isEnable)
    {
        foreach (var map in tempPics.Values)
            map.SetEnable(isEnable);
    }
    void Update()
    {
        TileUpdate();
    }
    /// <summary>
    /// 中心图块周围坐标对应图块的信息
    /// </summary>
    private Dictionary<Vector2, Vector3> Groundpoints;
    /// <summary>
    /// 中心图块
    /// </summary>
    public TempPic centerTemppic;
    private Ray ray;
    private RaycastHit hit;

    //刷新地图
    void TileUpdate()
    {
        ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (!EventSystem.current.IsPointerOverGameObject())
        {
            if (Physics.Raycast(ray, out hit, 1000, 1 << 8)) //
            {
                if (Input.GetMouseButtonUp(0))
                {
                    mapAxesTransfer.WorldToMC(hit.point);
                }
            }
        }
        if (Input.GetMouseButtonUp(2)|| Input.GetMouseButtonUp(1))
        {
            //找新的中心图 并刷新其周围图块 新的中心块一定是距离相机最近的一个 需要计算
            UpdateCamera();
        }
    }

    public void UpdateCamera()
    {
        Vector3 Screensize = new Vector3(Screen.width / 2, Screen.height / 2);
        ray = Camera.main.ScreenPointToRay(Screensize);
        if (Physics.Raycast(ray, out hit))//
        {
            if (hit.transform.gameObject.layer == 8)
            {
                if (hit.transform != centerTemppic.transform)
                {
                    Groundpoints[centerTemppic.PieceCoordinates] = centerTemppic.transform.position;
                    centerTemppic = hit.transform.GetComponent<TempPic>();
                    centerTemppic.isUpdate = true;
                    Groundpoints.Remove(centerTemppic.PieceCoordinates);
                    MapUpdate();
                }
            }
        }
    }

    [Header("是否使用输入得到中心点位置")]
    public bool IsInputCenter = false;
    [Header("输入的中心点经纬度")]
    public double inputlat = 118.050357d, inputlng = 36.860605d;
    void GetInputCenter()
    {
       centerPos = mapAxesTransfer.LLToPiece(new Vector2D(inputlat, inputlng), zoom);
    }
    public Vector2 centerPos;//中心块的块坐标
    //临时存储要删掉的图 
    public List<GameObject> TempDeleteMaps = new List<GameObject>();
    /// <summary>
    /// 初始化地图 以平面坐标左下角的图块的世界坐标为000;
    /// </summary>
    /// <param name="Center"></param>
    void InitMap(bool Center,bool isRefresh = false)
    {
        Vector3 InitPosition = Vector3.zero;
        var TempPicPre = Resources.Load<GameObject>("prefabgis/mapresources/TempPic");

        if (Center)
        {
            if (centerPos == Vector2.zero) //调用之前 赋值中心点.则 是更新地图层级.
                centerPos = new Vector2(Convert.ToInt32((mapAxesTransfer.leftPiece.x + mapAxesTransfer.rightPiece.x) / 2),
                    Convert.ToInt32((mapAxesTransfer.leftPiece.y + mapAxesTransfer.rightPiece.y) / 2));
            if (IsInputCenter) GetInputCenter();
            Vector2 offset = centerPos - mapAxesTransfer.leftPiece;
          
           // Debug.Log(offset);
            InitPosition = new Vector3(/*(int)numSize.x / 2 + 1 + */offset.x, 0, /*(int)numSize.y / 2 + 1 +*/ offset.y);
            InitPosition *= mapAxesTransfer.pixel;
        }
        else
        {
            //新的初始化 以图块左下角的图为原点  旧的是全图块中间的图作为原点
            //中心图块的块坐标   x是列数 y是行数
            centerPos = new Vector2(Convert.ToInt32((mapAxesTransfer.leftPiece.x + numSize.x / 2 + 1)), Convert.ToInt32((mapAxesTransfer.leftPiece.y + numSize.y / 2 + 1)));
            //初始化生成 具体数量是否要可变得 ?
            InitPosition = new Vector3((int)numSize.x / 2 + 1, 0, (int)numSize.x / 2 + 1);
            InitPosition *= mapAxesTransfer.pixel;
            //设置相机
        }
        //初始位置放到目标点
        if (isRefresh)
            RefreshMapLayer();
        else
            SetMap(TempPicPre, centerPos, InitPosition);
        Vector3 cameraPos;
        if (isRefresh)
            cameraPos = mapAxesTransfer.LLToWorld(CameraLL);
        else
            cameraPos = new Vector3(InitPosition.x + mapAxesTransfer.pixel / 2, 20, InitPosition.z + mapAxesTransfer.pixel / 2);
        Camera.main.transform.position = new Vector3(cameraPos.x, 20, cameraPos.z);

    }
    /// <summary>
    /// 以左下角为零点计算地图
    /// </summary>
    void SetMap(GameObject TempPicPre, Vector2 centerPos, Vector3 InitPosition)
    {
        WD_Debug._Print("初始化");
        //新的初始化 以图块左下角的图为原点  旧的是全图块中间的图作为原点
        GameObject centerTemp = Instantiate(TempPicPre, InitPosition, Quaternion.Euler(90, 0, 0)) as GameObject;
        centerTemp.transform.SetParent(transform);
        centerTemp.name = centerPos.ToString();
        centerTemppic = centerTemp.GetComponent<TempPic>();
        centerTemppic.PieceCoordinates = centerPos;
        LoadTexture.AddLoadTask(zoom, (int)centerPos.x, (int)centerPos.y, tex =>
        {
            centerTemppic.SetSprite(tex);
        });
        tempPics[centerPos] = centerTemppic;
        Groundpoints = centerTemppic.BoundsMapPos(numSize, mapAxesTransfer.pixel);
        foreach (var pos in Groundpoints.Keys)
        {
            GameObject temp = Instantiate(TempPicPre, Groundpoints[pos], Quaternion.Euler(90, 0, 0)) as GameObject;
            temp.transform.SetParent(transform);
            TempPic temppic = temp.GetComponent<TempPic>();
            LoadTexture.AddLoadTask(zoom, (int)pos.x, (int)pos.y, tex =>
            {
                temppic.SetSprite(tex);
            });
           // temppic.LoadPicSingleInit(GetPathZoom(pos));
            temppic.name = pos.ToString();
            temppic.PieceCoordinates = pos;
            tempPics[pos] = temppic;
        }
        LoadTexture.Preload(mapAxesTransfer.PieceToZoom(centerPos, zoom));
    }

    /// <summary>
    /// 中心图片更换之后调用 刷新周围 算法需要优化
    /// </summary>
    void MapUpdate()
    {
        Dictionary<Vector2, Vector3> newGroundpoints = centerTemppic.BoundsMapPos(numSize, mapAxesTransfer.pixel);
        List<Vector2> SamePoint = new List<Vector2>();//相同的点
        foreach(var pos in Groundpoints.Keys)
        {
            foreach (var poss in newGroundpoints.Keys)
            {
                if (!SamePoint.Contains(pos) && !SamePoint.Contains(poss))
                {
                    if (!newGroundpoints.ContainsKey(pos) && !Groundpoints.ContainsKey(poss))
                    {
                        SamePoint.Add(poss);
                        SamePoint.Add(pos);
                        if(tempPics.ContainsKey(pos))
                        {
                            TempPic temp = tempPics[pos];
                            temp.transform.position = newGroundpoints[poss];
                            temp.PieceCoordinates = poss;
                            temp.name = poss.ToString();
                            LoadTexture.AddLoadTask(zoom, (int)poss.x, (int)poss.y, tex =>
                            {
                                temp.SetSprite(tex);
                            });
                            //temp.LoadPicSingleInit(GetPathZoom(poss));
                            tempPics[poss] = temp;
                            tempPics.Remove(pos);
                        }
                    }
                }
            }
        }
        SamePoint.Clear();
        Groundpoints = newGroundpoints;
    }

    /// <summary>
    /// 刷新地图层级
    /// </summary>
    void RefreshMapLayer()
    {
        Dictionary<Vector2, TempPic> Vec_Temps = new Dictionary<Vector2, TempPic>();
        Vec_Temps[centerTemppic.PieceCoordinates] = centerTemppic;
        centerTemppic.name = centerTemppic.PieceCoordinates.ToString();
        LoadTexture.AddLoadTask(zoom, (int)centerTemppic.PieceCoordinates.x, (int)centerTemppic.PieceCoordinates.y, tex =>
        {
            centerTemppic.SetSprite(tex);
        });
        Dictionary<Vector2, Vector3> newGroundpoints = centerTemppic.BoundsMapPos(numSize, mapAxesTransfer.pixel);
        int index = 0;
        foreach (var poss in newGroundpoints.Keys)
        {
            var obj = tempPics.ElementAt(index);
            index++;
            TempPic temp = obj.Value;
            if (temp.transform.position != newGroundpoints[poss])//刷层级的时候其实,15级以下不会有重复  
                temp.transform.position = newGroundpoints[poss];
            temp.PieceCoordinates = poss;
            temp.name = poss.ToString();

            LoadTexture.AddLoadTask(zoom, (int)poss.x, (int)poss.y, tex =>
            {
                temp.SetSprite(tex);
            });
            Vec_Temps[poss] = temp;
        }
        tempPics = Vec_Temps;
    }
  
}

还有一个类图片预制体上需要挂的

主要用来计算周围图块的坐标

using UnityEngine;
using System.Collections.Generic;

public class TempPic : MonoBehaviour 
{
    public bool isUpdate = true;//是否需要刷新位置
    /// <summary>
    /// 块坐标
    /// </summary>
    public Vector2 PieceCoordinates;

    /// <summary>
    /// 四周八个相邻图片的位置  图位置 对应块坐标
    /// </summary>
    /// <returns></returns>
    public Dictionary<Vector2, Vector3> BoundsMapPos(Vector2 pieceNum,float size)
    {
        if (isUpdate || _boundsMapPos.Count == 0)
        {
            isUpdate = false;
            _boundsMapPos.Clear();
            GetDic(pieceNum, size);
        }
        return _boundsMapPos;
    }
    private readonly Dictionary<Vector2, Vector3> _boundsMapPos = new Dictionary<Vector2, Vector3>();

    public void SetColor(Color col)
    {
        if (spriterender == null)
            spriterender = GetComponent<SpriteRenderer>();
        spriterender.color = col;
    }
    void GetDic(Vector2 colraw, float size)
    {
        for (int i = 1; i < ((int)(colraw.x / 2))+1; i++)
        {
            for (int j = 1; j < ((int)(colraw.y / 2))+1; j++)
            {
                _boundsMapPos[PieceCoordinates + new Vector2(i, j)] = transform.position + new Vector3(size*i, 0, size*j);
                _boundsMapPos[PieceCoordinates + new Vector2(i, -j)] = transform.position + new Vector3(size * i, 0, -size * j);
                _boundsMapPos[PieceCoordinates + new Vector2(-i, -j)] = transform.position + new Vector3(-size * i, 0, -size * j);
                _boundsMapPos[PieceCoordinates + new Vector2(-i, j)] = transform.position + new Vector3(-size * i, 0, size * j);
                _boundsMapPos[PieceCoordinates + new Vector2(-i, 0)] = transform.position + new Vector3(-size * i, 0, 0);
                _boundsMapPos[PieceCoordinates + new Vector2(i, 0)] = transform.position + new Vector3(size * i, 0, 0);
                _boundsMapPos[PieceCoordinates + new Vector2(0, -j)] = transform.position + new Vector3(0, 0, -size * j);
                _boundsMapPos[PieceCoordinates + new Vector2(0, j)] = transform.position + new Vector3(0, 0, size * j);
            }
        }
    }

    private bool isshow = true;
    public void SetEnable(bool enable)
    {
        isshow = enable;
        spriterender.enabled = enable;
    }
    private SpriteRenderer spriterender;
    public void SetSprite(Sprite sp)
    {
        if (spriterender == null)
            spriterender = GetComponent<SpriteRenderer>();
        spriterender.sprite = sp;
        if (!spriterender.enabled && isshow)
            spriterender.enabled = true;
        if (GetComponent<BoxCollider>() == null)
        {
            BoxCollider box = gameObject.AddComponent<BoxCollider>();
            box.isTrigger = false;
        }
    }
}

再来一个相机上挂的

主要就是移动和范围控制以防拖动到了范围外的地方去

using UnityEngine;
using UnityEngine.EventSystems;

public class CameraMove : MonoBehaviour
{
    public float speed = 2;
    private Camera cameraMain;
    private Vector2 screenSize;
    public Vector3 oldpos;
    void Start ()
	{
	    cameraMain = Camera.main;
	    oldpos = cameraMain.transform.position;
	}
	void LateUpdate ()
    {
        ControlCamera();
    }
    /// <summary>
    /// 控制相机
    /// </summary>
    void ControlCamera() 
    {
        //视角拉伸
        if (Input.GetAxis("Mouse ScrollWheel") != 0&&!EventSystem.current.IsPointerOverGameObject())
        {
            cameraMain.orthographicSize += Input.GetAxis("Mouse ScrollWheel") * -1;

            if (MapManager.ins == null) return;

            if (cameraMain.orthographicSize<3f)
            {
                if (MapManager.ins.zoom<18)
                {
                    cameraMain.orthographicSize = 5f;
                    MapManager.ins.ChangeLayer(MapManager.ins.zoom + 1);
                }
                else
                {
                    if (cameraMain.orthographicSize < 2f) cameraMain.orthographicSize = 2f;
                }
            }
            if (cameraMain.orthographicSize>6f)
            {
                if (MapManager.ins.zoom > 13)
                {
                    cameraMain.orthographicSize = 4f;
                    MapManager.ins.ChangeLayer(MapManager.ins.zoom - 1);
                }
                else
                {
                    if (cameraMain.orthographicSize > 7f) cameraMain.orthographicSize = 7f;
                }
            }
        }
        //视角滑动
        //非精准移动
        if (Input.GetMouseButton(2)||Input.GetMouseButton(1))
        {
            //调用

            float x = Input.GetAxis("Mouse X");
            float y = Input.GetAxis("Mouse Y");
            transform.Translate(new Vector3(-x, -y, 0) * Time.deltaTime * 90 * speed);
            //范围圈定
            GetOffset();
            MaxPos = MapManager.ins.mapAxesTransfer.GetRightPos();
            if (transform.position.x > MaxPos.x- Screenoffset.x)
            {
                transform.position = new Vector3(MaxPos.x - Screenoffset.x, 20, transform.position.z);
            }
            if (transform.position.z > MaxPos.z- Screenoffset.z)
            {
                transform.position = new Vector3(transform.position.x, 20, MaxPos.z - Screenoffset.z);
            }
            if (transform.position.x < Screenoffset.x)
            {
                transform.position = new Vector3(Screenoffset.x, 20, transform.position.z);
            }
            if (transform.position.z < Screenoffset.z)
            {
                transform.position = new Vector3(transform.position.x, 20, Screenoffset.z);
            }
        }
      
    }
    public Vector3 MaxPos;
    private Vector3 Screenoffset;
    RaycastHit hit;
    Ray ray;
    void GetOffset()
    {
        ray = Camera.main.ScreenPointToRay(screenSize);
        if(Physics.Raycast(ray,out hit))
        {
            Screenoffset = transform.position- hit.point;
        }
    }
}

ok 到这里呢就基本大功告成了

效果图的话录得gif太大了这里超出了限制上传了资源可以下载看下https://download.youkuaiyun.com/download/qq_35080168/12411872