// Initialize the private variables of the object before using it (acts
// like a constructor).
public void Initialize(int zoom)
{
// read file as a basic xml file
XDocument myGPX = XDocument.Load(_gpxFileName);
// manager for the .gpx file format
XmlNamespaceManager r = new XmlNamespaceManager(new NameTable());
r.AddNamespace("p", "http://www.topografix.com/GPX/1/1");
// create gpx reader and retrieve coordinate and elevation data
var gPXReader = new GPXReaderLib.GPXReader(myGPX, r);
_coordinates = gPXReader.GetGPXCoordinates();
_elevation = gPXReader.GetGPXAltimetry().Altimetries.Select(c => c.Elevation).ToList();
// Find the corner OSM tiles (bottom left, top rigth) based on the
// gpx coordinates and the desired zoom level.
var coords = ComputeTrackCoordinates(_coordinates);
_leftBottom = AwesomeTiles.Tile.CreateAroundLocation(coords.minLat,
coords.minLon, zoom);
_rightTop = AwesomeTiles.Tile.CreateAroundLocation(coords.maxLat,
coords.maxLon, zoom);
}
// get the corner (Lon, Lat) coordinates of the GPX track.
public CornerCoordinates ComputeTrackCoordinates(GPXCoordinateList coords)
{
var coord = new CornerCoordinates();
coord.maxLon = coords.Max(c => c.Longitude);
coord.maxLat = coords.Max(c => c.Latitude);
coord.minLon = coords.Min(c => c.Longitude);
coord.minLat = coords.Min(c => c.Latitude);
return(coord);
}