public Point GetRandomPoint(TilePropagator propagator, TilePropagatorTileSet tileSet) { var topology = propagator.Topology; var points = new List <Point>(); for (var z = 0; z < topology.Depth; z++) { for (var y = 0; y < topology.Height; y++) { for (var x = 0; x < topology.Width; x++) { if (topology.Mask != null) { var index = topology.GetIndex(x, y, z); if (!topology.Mask[index]) { continue; } } propagator.GetBannedSelected(x, y, z, tileSet, out var isBanned, out var _); if (isBanned) { continue; } points.Add(new Point(x, y, z)); } } } // Choose a random point to select if (points.Count == 0) { throw new System.Exception($"No legal placement of {tileSet}"); } var i = (int)(propagator.RandomDouble() * points.Count); return(points[i]); }
public void Init(TilePropagator propagator) { tileSet = propagator.CreateTileSet(Tiles); countTracker = new CountTracker(propagator.Topology); selectedChangeTracker = propagator.CreateSelectedChangeTracker(tileSet, countTracker); if (Eager) { // Naive implementation /* * // Pick Count random indices * var topology = propagator.Topology; * var pickedIndices = new List<int>(); * var remainingIndices = new List<int>(topology.Indicies); * for (var c = 0; c < Count; c++) * { * var pickedIndexIndex = (int)(propagator.RandomDouble() * remainingIndices.Count); * pickedIndices.Add(remainingIndices[pickedIndexIndex]); * remainingIndices[pickedIndexIndex] = remainingIndices[remainingIndices.Count - 1]; * remainingIndices.RemoveAt(remainingIndices.Count - 1); * } * // Ban or select tiles to ensure an appropriate count * if(Comparison == CountComparison.AtMost || Comparison == CountComparison.Exactly) * { * foreach (var i in remainingIndices) * { * topology.GetCoord(i, out var x, out var y, out var z); * propagator.Ban(x, y, z, tileSet); * } * } * if (Comparison == CountComparison.AtLeast || Comparison == CountComparison.Exactly) * { * foreach (var i in pickedIndices) * { * topology.GetCoord(i, out var x, out var y, out var z); * propagator.Select(x, y, z, tileSet); * } * } */ var topology = propagator.Topology; var width = topology.Width; var height = topology.Height; var depth = topology.Depth; var pickedIndices = new List <int>(); var remainingIndices = new List <int>(topology.GetIndices()); while (true) { var noCount = 0; var yesCount = 0; var maybeList = new List <int>(); for (var z = 0; z < depth; z++) { for (var y = 0; y < height; y++) { for (var x = 0; x < width; x++) { var index = topology.GetIndex(x, y, z); if (topology.ContainsIndex(index)) { var selected = selectedChangeTracker.GetQuadstate(index); if (selected.IsNo()) { noCount++; } if (selected.IsMaybe()) { maybeList.Add(index); } if (selected.IsYes()) { yesCount++; } } } } } var maybeCount = maybeList.Count; if (Comparison == CountComparison.AtMost) { if (yesCount > Count) { // Already got too many, just fail propagator.SetContradiction(); return; } if (yesCount == Count) { // We've reached the limit, ban any more and exit Check(propagator); return; } var pickedIndex = maybeList[(int)(propagator.RandomDouble() * maybeList.Count)]; topology.GetCoord(pickedIndex, out var x, out var y, out var z); propagator.Select(x, y, z, tileSet); } else if (Comparison == CountComparison.AtLeast || Comparison == CountComparison.Exactly) { if (yesCount + maybeCount < Count) { // Already got too few, just fail propagator.SetContradiction(); return; } if (yesCount + maybeCount == Count) { // We've reached the limit, ban any more and exit Check(propagator); return; } var pickedIndex = maybeList[(int)(propagator.RandomDouble() * maybeList.Count)]; topology.GetCoord(pickedIndex, out var x, out var y, out var z); propagator.Ban(x, y, z, tileSet); } } } }