public override Uri GetUri(int x, int y, int zoomLevel)
{
Uri uri = null;
if (UriTemplate != null)
{
var tileSize = 360d / (1 << zoomLevel); // tile width in degrees
var west = MapProjection.Wgs84MeterPerDegree * (x * tileSize - 180d);
var east = MapProjection.Wgs84MeterPerDegree * ((x + 1) * tileSize - 180d);
var south = MapProjection.Wgs84MeterPerDegree * (180d - (y + 1) * tileSize);
var north = MapProjection.Wgs84MeterPerDegree * (180d - y * tileSize);
if (UriTemplate.Contains("{bbox}"))
{
uri = new Uri(UriTemplate.Replace("{bbox}",
string.Format(CultureInfo.InvariantCulture, "{0:F2},{1:F2},{2:F2},{3:F2}", west, south, east, north)));
}
else
{
uri = new Uri(UriTemplate
.Replace("{west}", west.ToString("F2", CultureInfo.InvariantCulture))
.Replace("{south}", south.ToString("F2", CultureInfo.InvariantCulture))
.Replace("{east}", east.ToString("F2", CultureInfo.InvariantCulture))
.Replace("{north}", north.ToString("F2", CultureInfo.InvariantCulture)));
}
}
return(uri);
}