/// <summary>
/// Converts GoogleImageFormat enum value to parameter string
/// </summary>
/// <param name="format">The image format enum value.</param>
/// <returns>Parameter string for the given format</returns>
public static string GetGoogleFormatString(GoogleImageFormat format)
{
switch (format)
{
case (GoogleImageFormat.PNG):
{
return("png");
}
case (GoogleImageFormat.PNG32):
{
return("png32");
}
case (GoogleImageFormat.GIF):
{
return("gif");
}
case (GoogleImageFormat.JPG):
{
return("jpg");
}
case (GoogleImageFormat.JPGBaseline):
{
return("jpg-baseline");
}
default:
{
return("jpg-baseline");
}
}
}
public string GetMapUri(float latitude, float longitude, int zoom, int scale, int width, int height, GoogleMapType mapType, GoogleImageFormat format, IList <TrackCoordinate> trackCoordinates)
{
var requestUri = string.Empty;
for (int i = _resolutionModifierStep; i <= _maxResolutionModifierStep; i++)
{
if (i > _resolutionModifierStep)
{
_logger.LogTrace($"Attempting to build Track Map requestUri at resolution of {i}");
}
string pathParameter = BuildMapPath(trackCoordinates, i);
requestUri = string.Format(
"https://maps.googleapis.com/maps/api/staticmap?center={0}&zoom={1}&size={2}&maptype={3}&format={4}{5}&key={6}",
$"{latitude},{longitude}",
zoom,
$"{width}x{height}",
GoogleMapHelper.GetGoogleMapTypeString(mapType),
GoogleMapHelper.GetGoogleFormatString(format),
pathParameter,
GoogleMapHelper.ApiKey);
if (requestUri.Length < 8192)
{
break;
}
else if (requestUri.Length > 8192 && i >= _maxResolutionModifierStep)
{
throw new InvalidOperationException($"requestUri too long: {requestUri.Length}");
}
}
return(requestUri);
}
public string GetMapUri(float latitude, float longitude, int zoom, int scale, int width, int height, GoogleMapType mapType, GoogleImageFormat format)
{
return(GetMapUri(latitude, longitude, zoom, scale, width, height, mapType, format, null));
}
public async Task <byte[]> GetMapAsync(float latitude, float longitude, int zoom, int scale, int width, int height, GoogleMapType mapType, GoogleImageFormat format, IList <TrackCoordinate> trackCoordinates)
{
byte[] bitmap = null;
try
{
var requestUri = string.Empty;
for (int i = _resolutionModifierStep; i <= _maxResolutionModifierStep; i++)
{
if (i > _resolutionModifierStep)
{
_logger.LogTrace($"Attempting to build Track Map requestUri at resolution of {i}");
}
string pathParameter = BuildMapPath(trackCoordinates, i);
requestUri = string.Format(
"https://maps.googleapis.com/maps/api/staticmap?&scale=1center={0}&zoom={1}&size={2}&maptype={3}&format={4}&key={5}{6}",
$"{latitude},{longitude}",
zoom,
$"{width}x{height}",
GoogleMapHelper.GetGoogleMapTypeString(mapType),
GoogleMapHelper.GetGoogleFormatString(format),
GoogleMapHelper.ApiKey,
pathParameter);
if (requestUri.Length < 8192)
{
break;
}
else if (requestUri.Length > 8192 && i >= _maxResolutionModifierStep)
{
throw new InvalidOperationException($"requestUri too long: {requestUri.Length}");
}
}
_logger.LogTrace($"Google Maps requestUri: {requestUri}");
using (WebClient wc = new WebClient())
{
bitmap = await wc.DownloadDataTaskAsync(new Uri(requestUri));
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Exception in GetMapAsync");
throw;
}
return(bitmap);
}
