private ProjectedVectorTile ComputeChild(DrawArgs drawArgs, double childSouth, double childNorth, double childWest, double childEast, double tileSize)
{
ProjectedVectorTile child = new ProjectedVectorTile(
new GeographicBoundingBox(childNorth, childSouth, childWest, childEast),
m_parentProjectedLayer);
return(child);
}
public virtual void ComputeChildren(DrawArgs drawArgs)
{
float tileSize = (float)(0.5 * (m_geographicBoundingBox.North - m_geographicBoundingBox.South));
//TODO: Stop children computation at some lower level
if (tileSize > 0.0001)
{
double CenterLat = 0.5f * (m_geographicBoundingBox.North + m_geographicBoundingBox.South);
double CenterLon = 0.5f * (m_geographicBoundingBox.East + m_geographicBoundingBox.West);
if (m_NorthWestChild == null && m_NwImageLayer != null && m_Initialized)
{
m_NorthWestChild = ComputeChild(drawArgs, CenterLat, m_geographicBoundingBox.North, m_geographicBoundingBox.West, CenterLon, tileSize);
m_NorthWestChild.Level = Level++;
m_NorthWestChild.Row = 2 * Row + 1;
m_NorthWestChild.Col = 2 * Col;
m_NorthWestChild.Initialize(drawArgs);
}
if (m_NorthEastChild == null && m_NeImageLayer != null && m_Initialized)
{
m_NorthEastChild = ComputeChild(drawArgs, CenterLat, m_geographicBoundingBox.North, CenterLon, m_geographicBoundingBox.East, tileSize);
m_NorthEastChild.Level = Level++;
m_NorthEastChild.Row = 2 * Row + 1;
m_NorthEastChild.Col = 2 * Col + 1;
m_NorthEastChild.Initialize(drawArgs);
}
if (m_SouthWestChild == null && m_SwImageLayer != null && m_Initialized)
{
m_SouthWestChild = ComputeChild(drawArgs, m_geographicBoundingBox.South, CenterLat, m_geographicBoundingBox.West, CenterLon, tileSize);
m_SouthWestChild.Level = Level++;
m_SouthWestChild.Row = 2 * Row;
m_SouthWestChild.Col = 2 * Col;
m_SouthWestChild.Initialize(drawArgs);
}
if (m_SouthEastChild == null && m_SeImageLayer != null && m_Initialized)
{
m_SouthEastChild = ComputeChild(drawArgs, m_geographicBoundingBox.South, CenterLat, CenterLon, m_geographicBoundingBox.East, tileSize);
m_SouthEastChild.Level = Level++;
m_SouthEastChild.Row = 2 * Row;
m_SouthEastChild.Col = 2 * Col + 1;
m_SouthEastChild.Initialize(drawArgs);
}
}
}
private void UpdateRootTiles()
{
int numberRows = (int)(180.0f / m_lzts);
System.Collections.ArrayList tileList = new System.Collections.ArrayList();
int istart = 0;
int iend = numberRows;
int jstart = 0;
int jend = numberRows * 2;
for (int i = istart; i < iend; i++)
{
for (int j = jstart; j < jend; j++)
{
double north = (i + 1) * m_lzts - 90.0f;
double south = i * m_lzts - 90.0f;
double west = j * m_lzts - 180.0f;
double east = (j + 1) * m_lzts - 180.0f;
ProjectedVectorTile newTile = new ProjectedVectorTile(
new GeographicBoundingBox(
north,
south,
west,
east),
this);
newTile.Level = 0;
newTile.Row = i;
newTile.Col = j;
tileList.Add(newTile);
}
}
m_rootTiles = (ProjectedVectorTile[])tileList.ToArray(typeof(ProjectedVectorTile));
}
public void Update(DrawArgs drawArgs)
{
try
{
double centerLatitude = 0.5 * (m_geographicBoundingBox.North + m_geographicBoundingBox.South);
double centerLongitude = 0.5 * (m_geographicBoundingBox.West + m_geographicBoundingBox.East);
double tileSize = m_geographicBoundingBox.North - m_geographicBoundingBox.South;
if (!m_Initialized)
{
if (drawArgs.WorldCamera.ViewRange * 0.5f < Angle.FromDegrees(ShapeTileArgs.TileDrawDistance * tileSize) &&
MathEngine.SphericalDistance(Angle.FromDegrees(centerLatitude), Angle.FromDegrees(centerLongitude),
drawArgs.WorldCamera.Latitude, drawArgs.WorldCamera.Longitude) < Angle.FromDegrees(ShapeTileArgs.TileSpreadFactor * tileSize * 1.25f) &&
drawArgs.WorldCamera.ViewFrustum.Intersects(BoundingBox)
)
{
Initialize(drawArgs);
}
}
if (m_Initialized)
{
if (m_LastUpdate < m_parentProjectedLayer.LastUpdate)
{
UpdateImageLayers(drawArgs);
}
if (m_NwImageLayer != null)
{
m_NwImageLayer.Update(drawArgs);
}
if (m_NeImageLayer != null)
{
m_NeImageLayer.Update(drawArgs);
}
if (m_SwImageLayer != null)
{
m_SwImageLayer.Update(drawArgs);
}
if (m_SeImageLayer != null)
{
m_SeImageLayer.Update(drawArgs);
}
if (
drawArgs.WorldCamera.ViewRange < Angle.FromDegrees(ShapeTileArgs.TileDrawDistance * tileSize) &&
MathEngine.SphericalDistance(Angle.FromDegrees(centerLatitude), Angle.FromDegrees(centerLongitude),
drawArgs.WorldCamera.Latitude, drawArgs.WorldCamera.Longitude) < Angle.FromDegrees(ShapeTileArgs.TileSpreadFactor * tileSize) &&
drawArgs.WorldCamera.ViewFrustum.Intersects(BoundingBox)
)
{
if (m_NorthEastChild == null && m_NorthWestChild == null && m_SouthEastChild == null && m_SouthWestChild == null)
{
ComputeChildren(drawArgs);
}
else
{
if (m_NorthEastChild != null)
{
m_NorthEastChild.Update(drawArgs);
}
if (m_NorthWestChild != null)
{
m_NorthWestChild.Update(drawArgs);
}
if (m_SouthEastChild != null)
{
m_SouthEastChild.Update(drawArgs);
}
if (m_SouthWestChild != null)
{
m_SouthWestChild.Update(drawArgs);
}
}
}
else
{
if (m_NorthWestChild != null)
{
m_NorthWestChild.Dispose();
m_NorthWestChild = null;
}
if (m_NorthEastChild != null)
{
m_NorthEastChild.Dispose();
m_NorthEastChild = null;
}
if (m_SouthEastChild != null)
{
m_SouthEastChild.Dispose();
m_SouthEastChild = null;
}
if (m_SouthWestChild != null)
{
m_SouthWestChild.Dispose();
m_SouthWestChild = null;
}
}
}
if (m_Initialized)
{
if (drawArgs.WorldCamera.ViewRange > Angle.FromDegrees(ShapeTileArgs.TileDrawDistance * tileSize * 1.5f) ||
MathEngine.SphericalDistance(Angle.FromDegrees(centerLatitude), Angle.FromDegrees(centerLongitude), drawArgs.WorldCamera.Latitude, drawArgs.WorldCamera.Longitude) > Angle.FromDegrees(ShapeTileArgs.TileSpreadFactor * tileSize * 1.5f))
{
if (this.Level != 0)
{
//{
Dispose();
}
//}
}
}
}
catch (Exception ex)
{
Log.Write(ex);
}
}
