/// <summary>
/// Override the getMesh function to get data from Bing's REST API
/// </summary>
/// <param name="x">Unity units in direction x from origin</param>
/// <param name="z">Unity units in direction z from origin</param>
/// <returns>A list of elevation points</returns>
List <float> IMapResources.getMesh(float x, float z)
{
//Use x and z to offset the quadkey
int initx = 0;
int initz = 0;
int initChosenZoomLevel = 14;
QuadKeyFuncs.QuadKeyToTileXY(originQuadKey, out initx, out initz, out initChosenZoomLevel);
initx = initx + Convert.ToInt32(x) / 256;
initz = initz + Convert.ToInt32(z) / 256;
String newQuadKey = QuadKeyFuncs.TileXYToQuadKey(initx, initz, initChosenZoomLevel);
double ucLat;
double ucLong;
QuadKeyFuncs.QuadKeyToLatLong(newQuadKey, out ucLat, out ucLong);
double lcLat;
double lcLong;
//Get the lower right corner
int tilex = 0;
int tilez = 0;
int chosenZoomLevel;
QuadKeyFuncs.QuadKeyToTileXY(newQuadKey, out tilex, out tilez, out chosenZoomLevel);
tilex = tilex + 1;
tilez = tilez + 1;
String lcquadkey = QuadKeyFuncs.TileXYToQuadKey(tilex, tilez, chosenZoomLevel);
QuadKeyFuncs.QuadKeyToLatLong(lcquadkey, out lcLat, out lcLong);
//Get chunks from database if it exists
//Otherwise, get the mesh from Bing's REST API
List <float> mesh = ElevationRequest(ucLat, ucLong, lcLat, lcLong, 32, newQuadKey.Length);
return(mesh);
}
/// <summary>
/// This is an asynchronous version of the getElevFunction in BingMapResources.cs.
/// It gets an elevation chunk from BingMaps Rest API using an offset from the
/// starting latitude and longitude in globals.
/// </summary>
/// <param name="x">The Unity coordinate for X</param>
/// <param name="z">The Unity coordinate for Z</param>
/// <returns></returns>
async public Task <List <float> > getElevChunk(float x, float z)
{
String originQuadKey = QuadKeyFuncs.getQuadKey(Globals.latitude, Globals.longitude, 14);
int initx = 0;
int initz = 0;
int initChosenZoomLevel = 14;
QuadKeyFuncs.QuadKeyToTileXY(originQuadKey, out initx, out initz, out initChosenZoomLevel);
initx = initx + Convert.ToInt32(x) / 256;
initz = initz + Convert.ToInt32(z) / 256;
//Get the upper left corner
String newQuadKey = QuadKeyFuncs.TileXYToQuadKey(initx, initz, initChosenZoomLevel);
double ucLat;
double ucLong;
QuadKeyFuncs.QuadKeyToLatLong(newQuadKey, out ucLat, out ucLong);
double lcLat;
double lcLong;
//Get the lower right corner
int tilex = 0;
int tilez = 0;
int chosenZoomLevel;
QuadKeyFuncs.QuadKeyToTileXY(newQuadKey, out tilex, out tilez, out chosenZoomLevel);
tilex = tilex + 1;
tilez = tilez + 1;
String lcquadkey = QuadKeyFuncs.TileXYToQuadKey(tilex, tilez, chosenZoomLevel);
QuadKeyFuncs.QuadKeyToLatLong(lcquadkey, out lcLat, out lcLong);
//Request Bing API elevations using the corners as a bounding box
String requestString = "http://dev.virtualearth.net/REST/v1/Elevation/Bounds?bounds=" + (lcLat) + "," + (lcLong) + "," + (ucLat) + "," + (ucLong) + "&rows=32&cols=32&key=" + Globals.BingAPIKey;
HttpClient client = new HttpClient();
var content = "";
bool tooManyRequestFlag = false;
do
{
tooManyRequestFlag = false;
try
{
content = await client.GetStringAsync(requestString);
}
catch (HttpRequestException e)
{
if (e.Message == "429 (Too Many Requests)")
{
tooManyRequestFlag = true;
}
else
{
throw e;
}
}
} while (tooManyRequestFlag);
int i;
int j;
int k;
//Convert the retrieved elevations into a usable chunk
int start = content.IndexOf("\"elevations\"") + 14;
int end = content.IndexOf("\"zoomLevel\"") - 2;
String elevation_string = content.Substring(start, end - start);
List <String> elevation_strings = elevation_string.Split(',').ToList();
List <float> retrieved_chunk = new List <float>();
for (k = 0; k < elevation_strings.Count; k++)
{
retrieved_chunk.Add(Convert.ToSingle(elevation_strings[k]));
}
//Flip the values in the retrieved chunks so that it matches the order of satellite imagery
//Note that elevations in Bing go from the bottom up in a square while the imagery uses the
//top left corner as its baseline. We chose to change the order of the elevations
List <float> newElevChunk = new List <float>();
for (i = 0; i < Math.Sqrt(retrieved_chunk.Count); i++)
{
for (j = 0; j < Math.Sqrt(retrieved_chunk.Count); j++)
{
newElevChunk.Add(retrieved_chunk[(31 - j) * Convert.ToInt32(Math.Sqrt(retrieved_chunk.Count)) + (31 - i)]);
}
}
return(newElevChunk);
}