private void SetStateLoadedInfo(List <BspSegment> segments)
{
// We're just picking a random vertex, and taking some random segment that
// comes out of that vertex.
int randomVertexIndex = VertexMap.Keys.First();
ConvexTraversalPoint randomLinePoint = VertexMap[randomVertexIndex].First();
BspSegment startSegment = randomLinePoint.Segment;
States.CurrentEndpoint = randomLinePoint.Endpoint;
States.StartSegment = startSegment;
States.CurrentSegment = startSegment;
States.TotalSegs = segments.Count;
}
private void AddSegmentEndpoint(BspSegment segment, int index, Endpoint endpoint)
{
ConvexTraversalPoint linePoint = new ConvexTraversalPoint(segment, endpoint);
if (VertexMap.TryGetValue(index, out List <ConvexTraversalPoint> linePoints))
{
linePoints.Add(linePoint);
VertexTracker.Track(linePoints.Count);
}
else
{
List <ConvexTraversalPoint> newLinePoints = new List <ConvexTraversalPoint> {
linePoint
};
VertexMap.Add(index, newLinePoints);
VertexTracker.Track(newLinePoints.Count);
}
}
private bool IsProperlyConnectedEndpoint(BspSegment segment, Endpoint endpoint)
{
if (Traversal.Empty())
{
return(true);
}
ConvexTraversalPoint lastPoint = Traversal.Last();
BspSegment lastSeg = lastPoint.Segment;
Endpoint lastEndpoint = lastPoint.Endpoint;
if (ReferenceEquals(segment, lastSeg))
{
Debug.Assert(false, "Trying to add the same segment twice");
return(false);
}
// Because our traversal uses the first endpoint we reached, that
// means the last segment's opposite endpoint should match this
// segment's current endpoint. Graphically, this means:
//
// LastEndpoint Endpoint
// o-----------o------------o
// LastSeg Segment
//
// Notice that the opposite endpoint of LastEndpoint is equal to
// the middle vertex labeled Endpoint. This is what we want to make
// sure are equal since it is not a valid traversal if they do not
// match.
if (segment.IndexFrom(endpoint) != lastSeg.OppositeIndex(lastEndpoint))
{
Debug.Assert(false, "Expect a tail-to-head connection");
return(false);
}
return(true);
}