public static async Task BuildForTile(uint tile, string folder, Func <uint, IEnumerable <OsmGeo> > getTile,
Func <TagsCollectionBase, bool> isBarrier)
{
// wait until tile is removed from queue.
while (true)
{
if (_tiles.ContainsKey(tile))
{
await Task.Delay(200);
}
else
{
_tiles[tile] = tile;
break;
}
}
try
{
var file = Path.Combine(folder, $"{tile}.tile.graph.zip");
if (File.Exists(file))
{
return;
}
// load data for tile.
var graph = new TiledBarrierGraph();
graph.LoadForTile(tile, getTile, isBarrier);
// run face assignment for the tile.
var result = graph.AssignFaces(tile);
while (!result.success)
{
// extra tiles need loading.-
graph.AddTiles(result.missingTiles, getTile, isBarrier);
// try again.
result = graph.AssignFaces(tile);
}
// assign landuse.
IEnumerable <(Polygon polygon, string type)> GetLanduse(
((double longitude, double latitude)topLeft, (double longitude, double latitude)bottomRight) box)
{
return(LandusePolygons.GetLandusePolygons(box, graph.Zoom, getTile, t =>
{
if (DefaultMergeFactorCalculator.Landuses.TryCalculateValue(t, out var type))
{
return type;
}
return null;
}));
}
graph.AssignLanduse(tile, GetLanduse);
await using var stream = File.Open(file, FileMode.Create);
await using var compressedStream = new GZipStream(stream, CompressionLevel.Fastest);
graph.WriteTileTo(compressedStream, tile);
}
finally
{
_tiles.Remove(tile, out _);
}
}