WaterFlush/Assets/Scripts/UI/Tools/CoordinateConverter.cs

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


public static class CoordinateConverter
{
    // 计算两个经纬度之间的距离，返回值为公里
    public static double Haversine(double lat1, double lon1, double lat2, double lon2)
    {
        // 将纬度和经度从度转换为弧度
        double R = 6371.0; // 地球半径，单位为公里
        double dLat = ToRadians(lat2 - lat1);
        double dLon = ToRadians(lon2 - lon1);

        lat1 = ToRadians(lat1);
        lat2 = ToRadians(lat2);

        // Haversine 公式
        double a = Mathf.Sin((float)dLat / 2) * Mathf.Sin((float)dLat / 2) +
                   Mathf.Cos((float)lat1) * Mathf.Cos((float)lat2) *
                   Mathf.Sin((float)dLon / 2) * Mathf.Sin((float)dLon / 2);
        double c = 2 * Mathf.Atan2(Mathf.Sqrt((float)a), Mathf.Sqrt((float)(1 - a)));

        // 计算距离
        double distance = R * c;
        return distance;
    }

    // 将角度转换为弧度
    private static double ToRadians(double angle)
    {
        return angle * Mathf.Deg2Rad;
    }


    // 将经纬度转换为Unity坐标
    public static Vector3 GeoToUnity(double longitude, double latitude)
    {

        float x = (float)(96151.617 * longitude - 10938527.4823);
        float z = (float)(111468.3949 * latitude - 3339986.2697); 

        return new Vector3(x, 0, z);
    }

    // 将Unity坐标转换为经纬度
    public static (double Longitude, double Latitude) UnityToGeo(Vector3 unityCoord)
    {

        double longitude = (unityCoord.x + 10938527.4823)/ 96151.617;

        double latitude = (unityCoord.z + 3339986.2697)/ 111468.3949;

        // 这里我们忽略了截距，因为我们假设Unity坐标的原点对应于经纬度的截距
        // 如果需要考虑截距，可以在这里添加相应的计算

        return (longitude, latitude);
    }


    public static Vector3 GeoToUGUI(double longitude, double latitude)
    {

        float x = (float)(355.53f * longitude - 40339.8622f);
        float y = (float)(409.37f * latitude - 12420.05f);

        return new Vector3(x, y, 0);
    }


    public static Vector3 GeoToUGUISmall(double longitude,double latitude)
    {

        float x = (float)(75.642f * longitude - 8607.658f);
        float y = (float)(87.990f * latitude - 2640.548f);

        return new Vector3(x, y, -0.400f);
    }

    
    public static (double longitude, double latitude) UGUISmallToGeo(Vector3 uiCoord)
    {

        double longitude = (uiCoord.x + 8607.658) / 75.642;

        double latitude = (uiCoord.y + 2640.548) / 87.990;

        // 这里我们忽略了截距，因为我们假设Unity坐标的原点对应于经纬度的截距
        // 如果需要考虑截距，可以在这里添加相应的计算

        return (longitude, latitude);
    }

    public static (double latitude, double longitude) UGUIToGeo(Vector3 ugui)
    {
        float x = ugui.x;
        float y = ugui.y;

        double latitude = (x + 40339.8622f) / 355.53f;
        double longitude = (y + 12420.05f) / 409.37f;

        return (latitude, longitude);
    }
}