/// <summary>
/// Reverse the order of the vertices. Only operates on the outer boundary
/// </summary>
public void Reverse()
{
// This is used in the process of combining triangles and therefore will work only with the face without holes
List <int> revIdxOuter = IndexOuterBoundary.ToList();
revIdxOuter.Reverse();
OuterAndInnerBoundaries.Clear();
BoundaryLinesDict.Clear();
SetupEdges(revIdxOuter, 0);
}
void SetupEdges(IList <int> vertxIndices, int idxOffset)
{
int boundLinesDictOffset = 0;
if (BoundaryLinesDict == null)
{
IEqualityComparer <IndexSegment> segCompare = new SegmentComparer(false /*compareBothDirections*/);
BoundaryLinesDict = new Dictionary <IndexSegment, int>(segCompare);
}
else
{
boundLinesDictOffset = BoundaryLinesDict.Count();
}
int prevIdx = 0;
int idx = 0;
int vertCount = vertxIndices.Count;
foreach (int vIdx in vertxIndices)
{
IndexSegment segm = null;
if (idx > 0)
{
segm = new IndexSegment(prevIdx, vIdx);
OuterAndInnerBoundaries.Add(idx - 1 + idxOffset, segm);
BoundaryLinesDict.Add(segm, (idx - 1 + boundLinesDictOffset)); // boundaryLinesDict is a dictionary for the combined outer and inner boundaries, the values should be sequential
}
if (idx == vertCount - 1) // The last index. Close the loop by connecing it to the first index
{
segm = new IndexSegment(vIdx, vertxIndices[0]);
OuterAndInnerBoundaries.Add((idx + idxOffset), segm);
BoundaryLinesDict.Add(segm, (idx + boundLinesDictOffset)); // boundaryLinesDict is a dictionary for the combined outer and inner boundaries, the values should be sequential
}
prevIdx = vIdx;
idx++;
}
}