3rdpartylibs/fastreports.wpf/FastReport.BaseExt/Map/CoordinateConverter.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace FastReport.Map
{
    internal static class CoordinateConverter
    {
        private const double MaxLat = 85.0511287798066;

        public static float GetX(double x, double minX, float scale)
        {
            return (float)((x - minX) * scale);
        }

        public static float GetY(double y, double maxY, float scale, bool mercator)
        {
            if (mercator)
            {
                y = ConvertMercator(y);
                maxY = ConvertMercator(maxY);
            }
            return (float)(-(y - maxY) * scale);
        }

        public static double ConvertMercator(double value)
        {
            if (value > MaxLat)
                value = MaxLat;
            else if (value < -MaxLat)
                value = -MaxLat;

            double sinLat = Math.Sin((Math.PI / 180) * value);
            return (90 / Math.PI) * Math.Log((1 + sinLat) / (1 - sinLat));
        }
    }
}