private static void PruneBrainLinks_Remove(TriangleIndexed triangle, TriangleEdge edge, List<Tuple<int[], int[]>> links)
{
int index1 = triangle.GetIndex(edge, true);
int index2 = triangle.GetIndex(edge, false);
Tuple<int[], int[]> existing = null;
bool? is1in1 = null;
// Find and remove the link that contains this edge
for (int cntr = 0; cntr < links.Count; cntr++)
{
if (links[cntr].Item1.Contains(index1) && links[cntr].Item2.Contains(index2))
{
is1in1 = true;
}
else if (links[cntr].Item1.Contains(index2) && links[cntr].Item2.Contains(index1))
{
is1in1 = false;
}
else
{
continue;
}
existing = links[cntr];
links.RemoveAt(cntr);
break;
}
if (existing == null)
{
//throw new ArgumentException("Didn't find the link");
// A neighbor triangle probably removed it
return;
}
// Add back if there were more than 2 involved
if (existing.Item1.Length == 1 && existing.Item2.Length == 1)
{
// This link only holds one item on each side. It's already removed from the list, so there is nothing left to do
return;
}
int[] newItem1 = PruneBrainLinks_Remove_Reduce(existing.Item1, index1, index2, is1in1.Value);
int[] newItem2 = PruneBrainLinks_Remove_Reduce(existing.Item2, index2, index1, is1in1.Value);
links.Add(Tuple.Create(newItem1, newItem2));
}
private static void PruneBrainLinks_Merge(TriangleIndexed triangle, TriangleEdge edge, List<Tuple<int[], int[]>> links)
{
// Figure out which indexes to look for
int[] pair = new[] { triangle.GetIndex(edge, true), triangle.GetIndex(edge, false) };
int other = triangle.IndexArray.First(o => !pair.Contains(o));
// Extract the affected links out of the list
List<Tuple<int[], int[]>> affected = new List<Tuple<int[], int[]>>();
int index = 0;
while (index < links.Count)
{
var current = links[index];
if (current.Item1.Contains(other) && current.Item2.Any(o => pair.Contains(o)))
{
affected.Add(current);
links.RemoveAt(index);
}
else if (current.Item2.Contains(other) && current.Item1.Any(o => pair.Contains(o)))
{
affected.Add(Tuple.Create(current.Item2, current.Item1)); // reversing them so that Item1 is always other
links.RemoveAt(index);
}
else
{
index++;
}
}
// Combine the affected links (there shouldn't be more than two)
var merged = Tuple.Create(
affected.SelectMany(o => o.Item1).Distinct().ToArray(),
affected.SelectMany(o => o.Item2).Distinct().ToArray());
links.Add(merged);
}