using System;
using System.Collections;
using UnityEngine;
using Coolape;

public static class LBSUtl
{
    //将tile(瓦片)坐标系转换为LatLngt(地理)坐标系，pixelX，pixelY为图片偏移像素坐标
    public static LatLng TileXYToLatLng(int tileX, int tileY, int zoom, int pixelX = 0, int pixelY = 0)
    {
        double size = Math.Pow(2, zoom);
        double pixelXToTileAddition = pixelX / 256.0;
        double lng = (tileX + pixelXToTileAddition) / size * 360.0 - 180.0;

        double pixelYToTileAddition = pixelY / 256.0;
        double lat = Math.Atan(Math.Sinh(Math.PI * (1 - 2 * (tileY + pixelYToTileAddition) / size))) * 180.0 / Math.PI;
        return new LatLng(lng, lat);
    }

    //将LatLngt地理坐标系转换为tile瓦片坐标系，pixelX，pixelY为图片偏移像素坐标
    public static void LatLngToTileXY(LatLng latlng, int zoom, out int tileX, out int tileY, out int pixelX, out int pixelY)
    {
        double size = Math.Pow(2, zoom);
        double x = ((latlng.Longitude + 180) / 360) * size;
        double lat_rad = latlng.Latitude * Math.PI / 180;
        double y = (1 - Math.Log(Math.Tan(lat_rad) + 1 / Math.Cos(lat_rad)) / Math.PI) / 2;
        y = y * size;

        tileX = (int)x;
        tileY = (int)y;
        pixelX = (int)((x - tileX) * 256);
        pixelY = (int)((y - tileY) * 256);
    }

}


public class LatLng
{
    public double Longitude = 0;
    public double Latitude = 0;
    public LatLng(double Longitude, double Latitude)
    {
        this.Longitude = Longitude;
        this.Latitude = Latitude;
    }
    public override string ToString()
    {
        return "Longitude:" + Longitude + ", Latitude:" + Latitude;
    }
}