public PointF getlatlong2xy (double longitude, double latitude) {
          var radians = Math.PI / 180;
          longitude = longitude * radians;
          latitude = latitude * radians;

          return new PointF(Convert.ToSingle(longitude), Convert.ToSingle(Math.Log(Math.Tan(Math.PI / 4 + 0.5 * latitude))));
}

public Image getImage(PointF[] points, int width, int height, int padding = 10)
        {
            if (points.Length == 0)
                return null;

            Image img = new Bitmap(width, height);

            PointF min = new PointF(points[0].X, points[0].Y);
            PointF max = new PointF(points[0].X, points[0].Y);

            foreach (PointF p in points)
            {
                min.X = (p.X < min.X) ? p.X : min.X;
                min.Y = (p.Y < min.Y) ? p.Y : min.Y;

                max.X = (p.X > max.X) ? p.X : max.X;
                max.Y = (p.Y > max.Y) ? p.Y : max.Y;
            }

            min = getlatlong2xy(min.X, min.Y);
            max = getlatlong2xy(max.X, max.Y);

            PointF XYlength = new PointF(max.X - min.X, max.Y - min.Y);

            int mapWidth = img.Width - padding * 2;
            int mapHeight = img.Height - padding * 2;

            float widthRatio = mapWidth / XYlength.X;
            float heightRatio = mapHeight / XYlength.Y;

            float globalRatio = Math.Min(widthRatio, heightRatio);

            int widthPadding = Convert.ToInt32((width - (XYlength.X * globalRatio)) / 2);
            int heightPadding = Convert.ToInt32((height - (XYlength.Y * globalRatio)) / 2);

            List<PointF> dpoints = new List<PointF>();

            foreach (PointF p in points)
            {
                PointF p1 = getlatlong2xy(p.X, p.Y);
                p1.X -= min.X;
                p1.Y -= min.Y;

                float x = widthPadding + p1.X * globalRatio;
                float y = img.Height - heightPadding - (p1.Y * globalRatio);

                dpoints.Add(new PointF(x, y));
            }

            Graphics g = Graphics.FromImage(img);
            g.FillPolygon(Brushes.Blue, dpoints.ToArray(), System.Drawing.Drawing2D.FillMode.Alternate);

            return img;
        }

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