protected void AddVertex(Face face, Vertex vertex)
{
base.AddVertex(vertex);
Faces.Remove(face);
HalfEdge h1 = face.HalfEdge;
HalfEdge h2 = h1.Next;
HalfEdge h3 = h2.Next;
HalfEdge h4 = new HalfEdge(h1.Origin);
HalfEdge h5 = new HalfEdge(h2.Origin);
HalfEdge h6 = new HalfEdge(h3.Origin);
HalfEdge h7 = new HalfEdge(vertex);
HalfEdge h8 = new HalfEdge(vertex);
HalfEdge h9 = new HalfEdge(vertex);
HalfEdges.AddRange(new List<HalfEdge> {h4, h5, h6, h7, h8, h9});
h4.Twin = h7;
h7.Twin = h4;
h5.Twin = h8;
h8.Twin = h5;
h6.Twin = h9;
h9.Twin = h6;
// Set all next
h1.Next = h5;
h5.Prev = h1;
h5.Next = h7;
h7.Prev = h5;
h7.Next = h1;
h1.Prev = h7;
h2.Next = h6;
h6.Prev = h2;
h6.Next = h8;
h8.Prev = h6;
h8.Next = h2;
h2.Prev = h8;
h3.Next = h4;
h4.Prev = h3;
h4.Next = h9;
h9.Prev = h4;
h9.Next = h3;
h3.Prev = h9;
Triangle t1 = new Triangle(h1);
Triangle t2 = new Triangle(h2);
Triangle t3 = new Triangle(h3);
Faces.Add(t1);
Faces.Add(t2);
Faces.Add(t3);
Tree.Add(vertex, t1, t2, t3);
LogEntry logEntry = new LogEntry("Adding edges.", this);
logEntry.Objects.Add(vertex);
Log.Add(logEntry);
}
public override bool AddVertex(Vertex vertex)
{
Triangle face = FindFace(vertex) as Triangle;
if (face == null)
return false;
AddVertex(face, vertex);
// Find halfedges of triangle
HalfEdge h1 = face.HalfEdge;
HalfEdge h2 = face.HalfEdge.Next.Twin.Next;
HalfEdge h3 = face.HalfEdge.Next.Twin.Next.Next.Twin.Next;
// Log registration for playback
LogEntry logEntry = new LogEntry("Select edges for delauney check", this);
logEntry.Objects.Add(vertex);
logEntry.Objects.Add(new Edge(h1.Origin, h1.Next.Origin));
logEntry.Objects.Add(new Edge(h2.Origin, h2.Next.Origin));
logEntry.Objects.Add(new Edge(h3.Origin, h3.Next.Origin));
Log.Add(logEntry);
// Flip if needed
LegalizeEdge(vertex, h1, h1.Face as Triangle);
LegalizeEdge(vertex, h2, h2.Face as Triangle);
LegalizeEdge(vertex, h3, h3.Face as Triangle);
return true;
}
public virtual bool AddVertex(Vertex vertex)
{
Vertices.Add(vertex);
LogEntry logEntry = new LogEntry("Adding vertex.", this);
logEntry.Objects.Add(vertex);
Log.Add(logEntry);
return true;
}
private void Flip(HalfEdge h)
{
HalfEdge h1 = h;
HalfEdge h2 = h1.Next;
HalfEdge h3 = h2.Next;
HalfEdge h4 = h.Twin;
HalfEdge h5 = h4.Next;
HalfEdge h6 = h5.Next;
if (h1.Face == null || h4.Face == null)
return;
LogEntry logEntry = new LogEntry("Flipping edge", this);
logEntry.Objects.Add(new Edge(h.Origin, h.Next.Origin));
Log.Add(logEntry);
// Remove old faces
Faces.Remove(h.Face);
Faces.Remove(h.Twin.Face);
h1.Next = h6;
h6.Prev = h1;
h6.Next = h2;
h2.Prev = h6;
h2.Next = h1;
h1.Prev = h2;
h1.Origin = h3.Origin;
h4.Next = h3;
h3.Prev = h4;
h3.Next = h5;
h5.Prev = h3;
h5.Next = h4;
h4.Prev = h5;
h4.Origin = h6.Origin;
Faces.Add(new Triangle(h1));
Faces.Add(new Triangle(h1.Twin));
}
private void LegalizeEdge(Vertex vertex, HalfEdge halfEdge, Triangle triangle)
{
if (vertex == null) throw new ArgumentNullException(nameof(vertex));
if (triangle == null)
return;
LogEntry logEntry = new LogEntry("Checking edge", this);
//logEntry.objects.Add(vertex);
logEntry.Objects.Add(halfEdge.Face);
logEntry.Objects.Add(new Edge(halfEdge.Origin, halfEdge.Next.Origin));
Log.Add(logEntry);
// Points to test
Vertex v1 = halfEdge.Twin.Next.Next.Origin;
Vertex v2 = halfEdge.Next.Twin.Next.Next.Origin;
Vertex v3 = halfEdge.Next.Next.Twin.Next.Next.Origin;
logEntry.Objects.Add(v1);
logEntry.Objects.Add(v2);
logEntry.Objects.Add(v3);
if (triangle.InsideCircumcenter(v1))
{
logEntry = new LogEntry("Found point Inside circumcenter", this);
logEntry.Objects.Add(v1);
logEntry.Objects.Add(halfEdge.Face);
Log.Add(logEntry);
}
if (triangle.InsideCircumcenter(v2))
{
logEntry = new LogEntry("Found point Inside circumcenter", this);
logEntry.Objects.Add(v2);
logEntry.Objects.Add(halfEdge.Face);
Log.Add(logEntry);
}
if (triangle.InsideCircumcenter(v3))
{
logEntry = new LogEntry("Found point Inside circumcenter", this);
logEntry.Objects.Add(v3);
logEntry.Objects.Add(halfEdge.Face);
Log.Add(logEntry);
}
if (triangle.InsideCircumcenter(v1) || triangle.InsideCircumcenter(v2) || triangle.InsideCircumcenter(v3))
{
HalfEdge h1 = halfEdge.Twin.Next.Twin;
HalfEdge h2 = halfEdge.Twin.Prev.Twin;
Flip(halfEdge);
logEntry = new LogEntry("Select recursive flip edges", this);
logEntry.Objects.Add(new Edge(h1.Origin, h1.Next.Origin));
logEntry.Objects.Add(new Edge(h2.Origin, h2.Next.Origin));
Log.Add(logEntry);
LegalizeEdge(vertex, h1.Twin, h1.Twin.Face as Triangle);
LegalizeEdge(vertex, h2.Twin, h2.Twin.Face as Triangle);
}
}
