/// <summary>
/// Loads visible place names from one file.
/// If cache files are appropriately named only files in view are hit
/// </summary>
void UpdateNames(WorldWindWFSPlacenameFile placenameFileDescriptor, ArrayList tempPlacenames, DrawArgs drawArgs)
{
// TODO: Replace with bounding box frustum intersection test
double viewRange = drawArgs.WorldCamera.TrueViewRange.Degrees;
double north = drawArgs.WorldCamera.Latitude.Degrees + viewRange;
double south = drawArgs.WorldCamera.Latitude.Degrees - viewRange;
double west = drawArgs.WorldCamera.Longitude.Degrees - viewRange;
double east = drawArgs.WorldCamera.Longitude.Degrees + viewRange;
//TODO: Implement GML parsing
if (placenameFileDescriptor.north < south)
{
return;
}
if (placenameFileDescriptor.south > north)
{
return;
}
if (placenameFileDescriptor.east < west)
{
return;
}
if (placenameFileDescriptor.west > east)
{
return;
}
WorldWindPlacename[] tilednames = placenameFileDescriptor.PlaceNames;
if (tilednames == null)
{
return;
}
tempPlacenames.Capacity = tempPlacenames.Count + tilednames.Length;
WorldWindPlacename curPlace = new WorldWindPlacename();
for (int i = 0; i < tilednames.Length; i++)
{
if (m_placeNames != null && curPlaceNameIndex < m_placeNames.Length)
{
curPlace = m_placeNames[curPlaceNameIndex];
}
WorldWindPlacename pn = tilednames[i];
float lat = pn.Lat;
float lon = pn.Lon;
// for easier hit testing
float lonRanged = lon;
if (lonRanged < west)
{
lonRanged += 360; // add a revolution
}
if (lat > north || lat < south || lonRanged > east || lonRanged < west)
{
continue;
}
float elevation = 0;
if (m_parentWorld.TerrainAccessor != null && drawArgs.WorldCamera.Altitude < 300000)
{
elevation = (float)m_parentWorld.TerrainAccessor.GetElevationAt(lat, lon);
}
float altitude = (float)(m_parentWorld.EquatorialRadius + World.Settings.VerticalExaggeration * m_altitude + World.Settings.VerticalExaggeration * elevation);
pn.cartesianPoint = MathEngine.SphericalToCartesian(lat, lon, altitude);
float distanceSq = Vector3.LengthSq(pn.cartesianPoint - drawArgs.WorldCamera.Position);
if (distanceSq > m_maximumDistanceSq)
{
continue;
}
if (distanceSq < m_minimumDistanceSq)
{
continue;
}
if (!drawArgs.WorldCamera.ViewFrustum.ContainsPoint(pn.cartesianPoint))
{
continue;
}
tempPlacenames.Add(pn);
}
}
WorldWindWFSPlacenameFile[] GetWFSFiles(double north, double south, double west, double east)
{
double tileSize = 0;
//base the tile size on the max viewing distance
double maxDistance = Math.Sqrt(m_maximumDistanceSq);
double factor = maxDistance / m_parentWorld.EquatorialRadius;
// True view range
if (factor < 1)
{
tileSize = Angle.FromRadians(Math.Abs(Math.Asin(maxDistance / m_parentWorld.EquatorialRadius)) * 2).Degrees;
}
else
{
tileSize = Angle.FromRadians(Math.PI).Degrees;
}
tileSize = (180 / (int)(180 / tileSize));
if (tileSize == 0)
{
tileSize = 0.1;
}
//Log.Write(Log.Levels.Debug, string.Format("TS: {0} -> {1}", name, tileSize));
//not working for some reason...
//int startRow = MathEngine.GetRowFromLatitude(south, tileSize);
//int endRow = MathEngine.GetRowFromLatitude(north, tileSize);
//int startCol = MathEngine.GetColFromLongitude(west, tileSize);
//int endCol = MathEngine.GetColFromLongitude(east, tileSize);
ArrayList placenameFiles = new ArrayList();
double currentSouth = -90;
//for (int row = 0; row <= endRow; row++)
while (currentSouth < 90)
{
double currentNorth = currentSouth + tileSize;
if (currentSouth > north || currentNorth < south)
{
currentSouth += tileSize;
continue;
}
double currentWest = -180;
while (currentWest < 180)
// for (int col = startCol; col <= endCol; col++)
{
double currentEast = currentWest + tileSize;
if (currentWest > east || currentEast < west)
{
currentWest += tileSize;
continue;
}
WorldWindWFSPlacenameFile placenameFile = new WorldWindWFSPlacenameFile(
m_name, m_placenameBaseUrl, m_typename, m_labelfield, currentNorth, currentSouth, currentWest, currentEast, m_parentWorld, m_cache);
int key = placenameFile.GetHashCode();
if (!m_fileHash.Contains(key))
{
m_fileHash.Add(key, placenameFile);
}
else
{
placenameFile = (WorldWindWFSPlacenameFile)m_fileHash[key];
}
placenameFiles.Add(placenameFile);
currentWest += tileSize;
}
currentSouth += tileSize;
}
return((WorldWindWFSPlacenameFile[])placenameFiles.ToArray(typeof(WorldWindWFSPlacenameFile)));
}
