void AddTile(WayTile tile)
{
if (_tiles.Any(t => t.Id == tile.Id))
{
return;
}
_tiles.Add(tile);
var(lon0, lat0, lon1, lat1) = TileMath.GetTileBounds(tile.Id, Zoom);
foreach (var node in tile.Nodes)
{
node.TileId = tile.Id;
node.VisitCount = 0;
if (_nodeLut.TryGetValue(node.Id, out WayTileNode existingNode))
{
// It is possible that both nodes are inside their own tile if they are exactly on the border. Which one wins doesn't matter.
var insideNode = existingNode.Inside.HasValue ? existingNode : node;
var outsideNode = existingNode.Inside.HasValue ? node : existingNode;
// Node id already exists. This is a link between two tiles. The existing node should be outside its tile
// and the new one should be inside. Otherwise something is wrong.
// 1) Let the node inside its own tile inherit the connections of the other
var tileLinkConnections = outsideNode.Conn.Where(id => insideNode.Conn.Any(idOther => idOther == id)).ToList();
insideNode.Conn.AddRange(tileLinkConnections);
// 2) Overwrite the old one with the new one in the LUT.
_nodeLut[node.Id] = insideNode;
}
else
{
_nodeLut[node.Id] = node;
}
}
var outside = _nodeLut.Values.Where(v => !v.Inside.HasValue).ToList();
int loaded = 0;
int notLoaded = 0;
foreach (var n in outside)
{
if (!n.Inside.HasValue)
{
long tileId = TileMath.GetTileId(n.Point.Lon, n.Point.Lat, Zoom);
if (_tiles.Any(t => t.Id == tileId))
{
loaded++;
}
else
{
notLoaded++;
}
}
// all outside nodes should be in tiles NOT loaded.
}
}
async Task LoadTileAtPoint(GeoCoord point)
{
long tileId = TileMath.GetTileId(point.Lon, point.Lat, Zoom);
await LoadTile(tileId);
}
