public virtual void Init(TilePropagator propagator)
{
changeTracker = propagator.CreateChangeTracker();
var p = propagator;
var topology = propagator.Topology;
// Ban any tiles which don't have a symmetry
foreach (var i in topology.GetIndices())
{
if (TryMapIndex(p, i, out var i2))
{
topology.GetCoord(i, out var x, out var y, out var z);
propagator.Select(x, y, z, propagator.TileModel.Tiles
.Where(tile => TryMapTile(tile, out var _)));
}
}
// Ban tiles that interact badly with their own symmetry
foreach (var i in topology.GetIndices())
{
if (TryMapIndex(p, i, out var i2))
{
topology.GetCoord(i, out var x, out var y, out var z);
if (i2 == i)
{
// index maps to itself, so only allow tiles that map to themselves
var allowedTiles = propagator.TileModel.Tiles
.Where(tile => TryMapTile(tile, out var tile2) && tile == tile2);
propagator.Select(x, y, z, allowedTiles);
continue;
}
// TODO: Support overlapped model?
if (propagator.TileModel is AdjacentModel adjacentModel)
{
for (var d = 0; d < topology.DirectionsCount; d++)
{
if (topology.TryMove(i, (Direction)d, out var dest) && dest == i2)
{
// index maps adjacent to itself, so only allow tiles that can be placed adjacent to themselves
var allowedTiles = propagator.TileModel.Tiles
.Where(tile => TryMapTile(tile, out var tile2) && adjacentModel.IsAdjacent(tile, tile2, (Direction)d))
.ToList();
propagator.Select(x, y, z, allowedTiles);
continue;
}
}
}
if (propagator.TileModel is GraphAdjacentModel graphAdjacentModel)
{
var sentinel = new Tile(new object());
for (var d = 0; d < topology.DirectionsCount; d++)
{
if (topology.TryMove(i, (Direction)d, out var dest, out var _, out var edgeLabel) && dest == i2)
{
// index maps adjacent to itself, so only allow tiles that can be placed adjacent to themselves
var allowedTiles = propagator.TileModel.Tiles
.Where(tile => TryMapTile(tile, out var tile2) && graphAdjacentModel.IsAdjacent(tile, tile2, edgeLabel));
propagator.Select(x, y, z, allowedTiles);
continue;
}
}
}
topology.GetCoord(i2, out var x2, out var y2, out var z2);
}
}
}
