/// <summary>
/// Replaces the P or Q vertices of the actualLayer with their
/// segment on the next layer.
/// </summary>
/// <param name="alternatingLayer">The actual alternating layer. It will be modified.</param>
/// <param name="straightSweep">If true, we are sweeping down else we're sweeping up.</param>
private void AppendSegmentsToAlternatingLayer(AlternatingLayer alternatingLayer, bool straightSweep)
{
var type = straightSweep ? VertexTypes.PVertex : VertexTypes.QVertex;
for (int i = 1; i < alternatingLayer.Count; i += 2)
{
var vertex = alternatingLayer[i] as SugiVertex;
if (vertex.Type == type)
{
var precedingContainer = alternatingLayer[i - 1] as SegmentContainer;
var succeedingContainer = alternatingLayer[i + 1] as SegmentContainer;
precedingContainer.Append(vertex.Segment);
precedingContainer.Join(succeedingContainer);
//remove the vertex and the succeeding container from the alternating layer
alternatingLayer.RemoveRange(i, 2);
i -= 2;
}
}
}
/// <summary>
/// Replaces the P or Q vertices of the <paramref name="alternatingLayer"/> with their segment on the next layer.
/// </summary>
/// <param name="alternatingLayer">The actual alternating layer. It will be modified.</param>
/// <param name="straightSweep">If true, we are sweeping down else we're sweeping up.</param>
private static void AppendSegmentsToAlternatingLayer(
[NotNull, ItemNotNull] AlternatingLayer alternatingLayer,
bool straightSweep)
{
Debug.Assert(alternatingLayer != null);
VertexTypes type = straightSweep ? VertexTypes.PVertex : VertexTypes.QVertex;
for (int i = 1; i < alternatingLayer.Count; i += 2)
{
var vertex = (SugiVertex)alternatingLayer[i];
if (vertex.Type == type)
{
var precedingContainer = (SegmentContainer)alternatingLayer[i - 1];
var succeedingContainer = (SegmentContainer)alternatingLayer[i + 1];
precedingContainer.Append(vertex.Segment);
precedingContainer.Join(succeedingContainer);
// Remove the vertex and the succeeding container from the alternating layer
alternatingLayer.RemoveRange(i, 2);
i -= 2;
}
}
}
