public TilePyramid(Geometry.GridRectangle bounds)
{
Bounds = bounds;
}
protected void UpdateTiles(Rect visRect, double downsample)
{
System.Diagnostics.Trace.WriteLine("UpdateTiles()");
if (visRect.Width == 0 || visRect.Height == 0)
return;
//Find which tiles changed
//Rect visRect = this.VisibleRect;
Geometry.GridRectangle visibleGridRect = new Geometry.GridRectangle(visRect.Left, visRect.Right, visRect.Top, visRect.Bottom);
TilePyramid oldTilePyramid = this.TilePyramid;
Trace.WriteLine(TileMapping.ToString());
TilePyramid newTilePyramid = TileMapping.VisibleTiles(visibleGridRect, downsample);
if (oldTilePyramid != null)
{
if (false == oldTilePyramid.Bounds.Intersects(newTilePyramid.Bounds))
Tiles.Clear();
else
{
//Might be able to really speed up culling dead tiles with QuadTrees
//Sort out which of the old tiles are no longer visible
for (int iTile = 0; iTile < Tiles.Count; iTile++)
{
TileViewModel t = Tiles[iTile];
if (false == visibleGridRect.Intersects(t.Bounds))
{
Tiles.RemoveAt(iTile);
iTile--;
}
else
{
//SortedDictionary<string, Tile> tilesForLevel = newTilePyramid.GetTilesForLevel(t.Downsample);
}
}
}
}
//Create tiles which are new
for(int iLevel = newTilePyramid.AvailableLevels.Length -1; iLevel >= 0; iLevel--)
//for (int iLevel = 0; iLevel >= 0; iLevel--)
//for (int iLevel = 0; iLevel < newTilePyramid.AvailableLevels.Length; iLevel++)
{
int level = newTilePyramid.AvailableLevels[iLevel];
SortedDictionary<string, Tile> tiles = newTilePyramid.GetTilesForLevel(level);
bool IgnoreOldPyramid = oldTilePyramid == null;
//Don't check the old pyramid if it doesn't have the downsample level we are looking at
if (false == IgnoreOldPyramid)
{
if (oldTilePyramid.AvailableLevels.Length == 0)
{
IgnoreOldPyramid = true;
}
else
{
IgnoreOldPyramid = level < oldTilePyramid.AvailableLevels.Min();
if (false == IgnoreOldPyramid)
{
IgnoreOldPyramid = level > oldTilePyramid.AvailableLevels.Max();
}
}
}
foreach (Tile t in tiles.Values)
{
//We already loaded this one
// if (!IgnoreOldPyramid && oldTilePyramid.Bounds.Intersects(t.Bounds))
// continue;
// else
{
TileViewModel tileViewModel = null;
tileViewModel = TileCache.Fetch(t.UniqueKey);
if (tileViewModel == null)
{
tileViewModel = new TileViewModel(t, TileMapping.TilePath);
TileCache.Add(t.UniqueKey, tileViewModel);
}
// else
// {
//Don't add it to the collection again
if (Tiles.Contains(tileViewModel))
continue;
//}
this.Tiles.Add(tileViewModel);
}
}
}
//This is horrible, but I do it to trigger the Dependancy property listeners because 3D collections don't subribe to the collection change notifications
ObservableCollection<TileViewModel> newTiles = new ObservableCollection<TileViewModel>(this.Tiles);
this.Tiles = newTiles;
TilePyramid = newTilePyramid;
}
