public static Windows.Foundation.Point LocationToGlobalPixel(BasicGeoposition location, double zoom)
#endif
{
double x = (location.Longitude + 180) / 360;
double sinLatitude = Math.Sin(SpatialTools.ToRadians(location.Latitude));
double y = 0.5 - Math.Log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI);
double mapSize = MapSize(zoom);
#if WINDOWS_APP || WINDOWS_PHONE_APP
return(new Windows.Foundation.Point((int)(x * mapSize), (int)(y * mapSize)));
#elif WPF || WINDOWS_PHONE
return(new System.Windows.Point((int)(x * mapSize), (int)(y * mapSize)));
#endif
}
/// <summary>
/// Calculates the Ground resolution at a specific degree of latitude in the specified units per pixel.
/// </summary>
/// <param name="latitude">Degree of latitude to calculate resolution at</param>
/// <param name="zoom">Zoom level to calculate resolution at</param>
/// <param name="unitType">Distance unit type to calculate resolution in</param>
/// <returns>Ground resolution in distance unit per pixels</returns>
public static double GroundResolution(double latitude, double zoom, DistanceUnits units)
{
double earthRadius = SpatialTools.GetEarthRadius(units);
return((Math.Cos(SpatialTools.ToRadians(latitude)) * 2 * Math.PI * earthRadius) / MapSize(zoom));
}
