public virtual void AddToDownloadQueue(CameraBase camera, GeoSpatialDownloadRequest newRequest)
{
QuadTile key = newRequest.QuadTile;
key.WaitingForDownload = true;
lock (m_downloadRequests.SyncRoot)
{
if (m_downloadRequests.Contains(key))
{
return;
}
m_downloadRequests.Add(key, newRequest);
if (m_downloadRequests.Count >= m_maxQueueSize)
{
//remove spatially farthest request
GeoSpatialDownloadRequest farthestRequest = null;
Angle curDistance = Angle.Zero;
Angle farthestDistance = Angle.Zero;
foreach (GeoSpatialDownloadRequest curRequest in m_downloadRequests.Values)
{
curDistance = MathEngine.SphericalDistance(
curRequest.QuadTile.CenterLatitude,
curRequest.QuadTile.CenterLongitude,
camera.Latitude,
camera.Longitude);
if (curDistance > farthestDistance)
{
farthestRequest = curRequest;
farthestDistance = curDistance;
}
}
farthestRequest.Dispose();
farthestRequest.QuadTile.DownloadRequest = null;
m_downloadRequests.Remove(farthestRequest.QuadTile);
}
}
ServiceDownloadQueue();
}
/// <summary>
/// Updates this layer (background)
/// </summary>
public virtual void Update(DrawArgs drawArgs)
{
if (m_isResetingCache)
{
return;
}
try {
double tileSize = North - South;
if (!isInitialized)
{
if (DrawArgs.Camera.ViewRange * 0.5f < Angle.FromDegrees(QuadTileSet.TileDrawDistance * tileSize) && MathEngine.SphericalDistance(CenterLatitude, CenterLongitude, DrawArgs.Camera.Latitude, DrawArgs.Camera.Longitude) < Angle.FromDegrees(QuadTileSet.TileDrawSpread * tileSize * 1.25f) &&
DrawArgs.Camera.ViewFrustum.Intersects(BoundingBox))
{
Initialize();
}
}
if (isInitialized && World.Settings.VerticalExaggeration != verticalExaggeration || m_CurrentOpacity != QuadTileSet.Opacity ||
QuadTileSet.RenderStruts != renderStruts)
{
CreateTileMesh();
}
if (isInitialized)
{
if (DrawArgs.Camera.ViewRange < Angle.FromDegrees(QuadTileSet.TileDrawDistance * tileSize) && MathEngine.SphericalDistance(CenterLatitude, CenterLongitude, DrawArgs.Camera.Latitude, DrawArgs.Camera.Longitude) < Angle.FromDegrees(QuadTileSet.TileDrawSpread * tileSize) &&
DrawArgs.Camera.ViewFrustum.Intersects(BoundingBox))
{
if (northEastChild == null || northWestChild == null || southEastChild == null ||
southWestChild == null)
{
ComputeChildren(drawArgs);
}
if (northEastChild != null)
{
northEastChild.Update(drawArgs);
}
if (northWestChild != null)
{
northWestChild.Update(drawArgs);
}
if (southEastChild != null)
{
southEastChild.Update(drawArgs);
}
if (southWestChild != null)
{
southWestChild.Update(drawArgs);
}
}
else
{
if (northWestChild != null)
{
northWestChild.Dispose();
northWestChild = null;
}
if (northEastChild != null)
{
northEastChild.Dispose();
northEastChild = null;
}
if (southEastChild != null)
{
southEastChild.Dispose();
southEastChild = null;
}
if (southWestChild != null)
{
southWestChild.Dispose();
southWestChild = null;
}
}
}
if (isInitialized)
{
if (DrawArgs.Camera.ViewRange / 2 > Angle.FromDegrees(QuadTileSet.TileDrawDistance * tileSize * 1.5f) ||
MathEngine.SphericalDistance(CenterLatitude, CenterLongitude, DrawArgs.Camera.Latitude, DrawArgs.Camera.Longitude) > Angle.FromDegrees(QuadTileSet.TileDrawSpread * tileSize * 1.5f))
{
if (Level != 0 ||
(Level == 0 && !QuadTileSet.AlwaysRenderBaseTiles))
{
this.Dispose();
}
}
}
}
catch {}
}
