[游戏开发]根据经纬度，计算距离

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

public class UpdateDemo : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
{
    public RectTransform m_bg;
    public RectTransform m_center;
    private Vector2 m_localCursor;


    public float lat1;
    public float lon1;
    public float lat2;
    public float lon2;
    public char unit;

    private void Start()
    {
        double dis = DistanceBetweenPoint(lat1, lon1, lat2, lon2, unit);
        Debug.LogError("dis=" + dis);
    }

    // Update is called once per frame
    //void Update()
    //{
    //    Vector3 v1 = new Vector3(179.232f, 12.9f, 33.94835f);
    //    Vector3 v2 = new Vector3(179.232f, 14.9f, 33.94835f);
    //    Debug.LogError("dis=" + Vector3.Distance(v1, v2));

    //    //Debug.LogError("Update=" + Time.deltaTime);
    //}


	// 参考：https://www.geodatasource.com/developers/c-sharp
    public void OnPointerDown(PointerEventData eventData)
    {
        Debug.LogError("OnPointerDown");

        //if (RectTransformUtility.RectangleContainsScreenPoint(m_bg, Input.mousePosition, Camera.main))
        {
            Debug.LogError("in image");
            RectTransformUtility.ScreenPointToLocalPointInRectangle(m_bg, Input.mousePosition, Camera.main, out m_localCursor);
            m_center.anchoredPosition = m_localCursor;
        }
        //else
        //{
        //    Debug.LogError("out image");
        //}
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        //m_virtualJoystick.position = m_center.position;
        //m_content.rectTransform.anchoredPosition = Vector3.zero;
        Debug.LogError("OnPointerUp");

    }

    public double DistanceBetweenPoint(float lat1, float lon1, float lat2, float lon2, char unit)
    {
        if ((lat1 == lat2) && (lon1 == lon2))
        {
            return 0;
        }
        else
        {
            double theta = lon1 - lon2;
            double dist = Math.Sin(deg2rad(lat1)) * Math.Sin(deg2rad(lat2)) + Math.Cos(deg2rad(lat1)) * Math.Cos(deg2rad(lat2)) * Math.Cos(deg2rad(theta));
            dist = Math.Acos(dist);
            dist = rad2deg(dist);
            dist = dist * 60 * 1.1515;
            if (unit == 'K')
            {
                dist = dist * 1.609344;
            }
            else if (unit == 'N')
            {
                dist = dist * 0.8684;
            }
            return (dist);
        }
    }

    //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    //::  This function converts decimal degrees to radians             :::
    //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    private double deg2rad(double deg)
    {
        return (deg * Math.PI / 180.0);
    }

    //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    //::  This function converts radians to decimal degrees             :::
    //:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    private double rad2deg(double rad)
    {
        return (rad / Math.PI * 180.0);
    }
}

经纬度计算距离：
https://www.geodatasource.com/developers/c-sharp 代码
https://tool.box3.cn/lbs.html 经纬度计算距离
https://jingyan.baidu.com/article/f7ff0bfc7fed532e26bb1394.html 百度地图查询经纬度方法

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