using NetTopologySuite.Geometries;

namespace LY.App.Common
{
    public static class CoordConvert
    {

        /// <summary>
        /// 经纬度转Web墨卡托（单位：米）
        /// </summary>
        /// <param name="longitude">经度</param>
        /// <param name="latitude">纬度</param>
        /// <returns>转换后的位置</returns>
        public static CoordPoint WGS84ToMercator(double lon, double lat)
        {
            var x = lon * Math.PI / 180 * Parameters.LongRadius;
            var param = lat * Math.PI / 180;
            var y = Parameters.LongRadius / 2 * Math.Log((1.0 + Math.Sin(param)) / (1.0 - Math.Sin(param)));
            return new CoordPoint(x, y);
        }
        /// <summary>
        /// 经纬度转Web墨卡托（单位：米）
        /// </summary>
        /// <param name="longitude">经度</param>
        /// <param name="latitude">纬度</param>
        /// <returns>转换后的位置</returns>
        public static CoordPoint WGS84ToMercator(Coordinate coord)
        {
            return WGS84ToMercator(coord.Lon, coord.Lat);
        }

        /// <summary>
        /// Web墨卡托转经纬度
        /// </summary>
        /// <param name="x">X坐标值（单位：米）</param>
        /// <param name="y">Y坐标值（单位：米）</param>
        /// <returns>转换后的位置</returns>
        public static Coordinate MercatorToWGS84(double x, double y)
        {
            var lon = x / Parameters.MercatorLength * 180;
            var lat = y / Parameters.MercatorLength * 180;
            lat = 180 / Math.PI * (2 * Math.Atan(Math.Exp(lat * Math.PI / 180)) - Math.PI / 2);
            return new Coordinate(lon, lat);
        }

        /// <summary>
        /// Web墨卡托转经纬度
        /// </summary>
        /// <param name="x">X坐标值（单位：米）</param>
        /// <param name="y">Y坐标值（单位：米）</param>
        /// <returns>转换后的位置</returns>
        public static Coordinate MercatorToWGS84(CoordPoint point)
        {
            return MercatorToWGS84(point.X, point.Y);
        }
    }
}