public static void Swap(ref SortedVertex v1, ref SortedVertex v2)
{
var temp = v1;
v1 = v2;
v2 = temp;
}
private static Triangle CreateTriangle(SortedVertex v1, SortedVertex v2, SortedVertex v3)
{
FixWindingOrder(ref v1, ref v2, v3);
var triangle = new Triangle(v1.InitialIndex, v2.InitialIndex, v3.InitialIndex);
return(triangle);
}
private static void FixWindingOrder(ref SortedVertex edgeV1, ref SortedVertex edgeV2, SortedVertex v1)
{
var crossProduct = TriangulationHelper.CrossProduct(edgeV2.Vertex - edgeV1.Vertex, v1.Vertex - edgeV2.Vertex);
if (crossProduct > 0)
{
TriangulationHelper.Swap(ref edgeV1, ref edgeV2);
}
}
private static void AddTriangle(SortedVertex v1, SortedVertex v2, SortedVertex v3, ISet <Triangle> existingTriangles,
IEnumerable <IEnumerable <int> > holeVertices)
{
var triangle = CreateTriangle(v1, v2, v3);
if (triangle != null)
{
AddTriangleIfNeeded(existingTriangles, triangle, holeVertices);
}
}
private static void AddQuad(SortedVertex v1, SortedVertex v2, SortedVertex v3, SortedVertex v4,
ISet <Triangle> existingTriangles, IReadOnlyCollection <IEnumerable <int> > holeVertices)
{
AddTriangle(v1, v2, v3, existingTriangles, holeVertices);
AddTriangle(v2, v1, v4, existingTriangles, holeVertices);
}