private IEnumerable <NeighbourInfo> CalculateNeighbours(KeyValuePair <Parcel, ISubdivisionContext> subject, NeighbourSet <ISubdivisionContext> nodes)
{
foreach (var edge in subject.Key.Edges)
{
var query = new LineSegment2(edge.Start, edge.End);
var neighbours = nodes.Neighbours(query, MathHelper.ToRadians(5), 1);
foreach (var neighbour in neighbours)
{
//Do not add self as a neighbour!
if (neighbour.Value.Equals(subject.Value))
{
continue;
}
yield return(new NeighbourInfo(
neighbour.Value,
neighbour.Segment.Transform(WorldTransformation),
neighbour.SegmentOverlapStart,
neighbour.SegmentOverlapEnd,
query.Transform(WorldTransformation),
neighbour.QueryOverlapStart,
neighbour.QueryOverlapEnd
));
}
}
}
public void AssertThat_OverlappingLineSegments_AreNeighbours()
{
_set.Add(new LineSegment2(new Vector2(0, 0), new Vector2(10, 0)), 1);
_set.Add(new LineSegment2(new Vector2(5, 0), new Vector2(15, 0)), 2);
var neighbours = _set.Neighbours(new LineSegment2(new Vector2(0, 0), new Vector2(10, 0)), 0, 0).ToArray();
// ReSharper disable once ExceptionNotDocumented
Assert.AreEqual(1, neighbours.Length);
Assert.AreEqual(new LineSegment2(new Vector2(5, 0), new Vector2(15, 0)), neighbours.Single().Segment);
Assert.AreEqual(0f, neighbours.Single().SegmentOverlapStart);
Assert.AreEqual(0.5f, neighbours.Single().SegmentOverlapEnd);
Assert.AreEqual(0.5f, neighbours.Single().QueryOverlapStart);
Assert.AreEqual(1.0f, neighbours.Single().QueryOverlapEnd);
Assert.AreEqual(2, neighbours.Single().Value);
}