public void PickObservation(out int index, out int pattern)
{
var topology = propagator.Topology;
var t = edgedPathView.PathSelectedTracker;
// Find cells that could potentially be paths, and are next to
// already selected path. In tileSpace
var tilePriority = Enumerable.Range(0, topology.IndexCount).Select(i =>
{
if (!topology.ContainsIndex(i))
{
return(-1);
}
var qs = t.GetQuadstate(i);
if (qs.IsYes())
{
return(2);
}
if (qs.IsNo())
{
return(0);
}
// Determine if any neighbours exit onto this tile
for (var d = 0; d < topology.DirectionsCount; d++)
{
if (topology.TryMove(i, (Direction)d, out var i2, out var inverseDirection, out var _))
{
if (edgedPathView.TrackerByExit.TryGetValue(inverseDirection, out var tracker))
{
var s2 = tracker.GetQuadstate(i2);
if (s2.IsYes())
{
return(1);
}
}
}
}
return(0);
}).ToArray();
var patternPriority = tileModelMapping.PatternCoordToTileCoordIndexAndOffset == null ? tilePriority : throw new NotImplementedException();
index = randomPicker.GetRandomIndex(randomDouble, patternPriority);
if (index == -1)
{
fallbackHeuristic.PickObservation(out index, out pattern);
propagator.Topology.GetCoord(index, out var x, out var y, out var z);
}
else
{
propagator.Topology.GetCoord(index, out var x, out var y, out var z);
pattern = randomPicker.GetRandomPossiblePatternAt(index, randomDouble);
}
}
private void Observe(out int index, out int pattern)
{
pickHeuristic.PickObservation(out index, out pattern);
if (index == -1)
{
return;
}
// Decide on the given cell
if (InternalSelect(index, pattern))
{
status = Resolution.Contradiction;
}
}