private static bool SideIsNeighbor(this Side side, Level level, Side possibleNeighbor, bool left, out bool neighborFlowsOutward)
{
var line = level.Lines[side.LineIndex];
var endpointIndex = side.EndpointIndex(level, line, left);
var endpointLines = level.EndpointLines[endpointIndex];
foreach (var neighborLine in endpointLines)
{
if (neighborLine == line)
{
continue;
}
neighborFlowsOutward = neighborLine.EndpointIndexes[0] == endpointIndex;
var neighborIsClockwise = neighborFlowsOutward != left;
var neighborSide = neighborLine.Side(level, neighborIsClockwise);
if (neighborSide == null)
{
continue;
}
if (neighborSide == possibleNeighbor)
{
return(true);
}
}
neighborFlowsOutward = false;
return(false);
}