public void GeneratorTreeCotree(TriMesh mesh, out DynamicTree <TriMesh.Vertex> primalTree, out DynamicTree <TriMesh.Face> dualTree)
{
TreeNode <TriMesh.Vertex>[] primalFlags = null;
TreeNode <TriMesh.Face>[] dualFlags = null;
primalTree = BuildPrimalSpanningTree(mesh, out primalFlags);
dualTree = BuildDualSpanningCoTree(mesh, primalFlags, out dualFlags);
}
public List <List <TriMesh.HalfEdge> > ExtractHonologyGenerator(TriMesh mesh)
{
TreeNode <TriMesh.Vertex>[] primalFlags = null;
TreeNode <TriMesh.Face>[] dualFlags = null;
DynamicTree <TriMesh.Vertex> primalTree = BuildPrimalSpanningTree(mesh, out primalFlags);
DynamicTree <TriMesh.Face> dualTree = BuildDualSpanningCoTree(mesh, primalFlags, out dualFlags);
List <List <TriMesh.HalfEdge> > cycles = BuildCycle(mesh, primalFlags, dualFlags);
ColorCycle(cycles);
return(cycles);
}
public List <TriMesh.Edge> BuildCoTree(DynamicTree <TriMesh.Face> cotree)
{
if (cotree == null)
{
return(null);
}
List <TriMesh.Edge> cotreeMarks = new List <HalfEdgeMesh.Edge>();
Vector3D[] bycenters = new Vector3D[mesh.Faces.Count];
cotreeMarks = new List <HalfEdgeMesh.Edge>();
TreeNode <TriMesh.Face> currentCoNode = cotree.Root;
Queue <TreeNode <TriMesh.Face> > coQueue = new Queue <TreeNode <TriMesh.Face> >();
coQueue.Enqueue(currentCoNode);
do
{
currentCoNode = coQueue.Dequeue();
bycenters[currentCoNode.Attribute.Index] = TriMeshUtil.GetMidPoint(currentCoNode.Attribute);
TreeNode <TriMesh.Face> currentChild = currentCoNode.LeftMostChild;
while (currentChild != null)
{
//Mark edge
TriMesh.Face f1 = currentCoNode.Attribute;
TriMesh.Face f2 = currentChild.Attribute;
foreach (TriMesh.HalfEdge hf in f1.Halfedges)
{
if (hf.Opposite.Face == f2)
{
cotreeMarks.Add(hf.Edge);
break;
}
}
coQueue.Enqueue(currentChild);
currentChild = currentChild.RightSibling;
}
} while (coQueue.Count > 0);
return(cotreeMarks);
}
public List <TriMesh.Edge> BuildTree(DynamicTree <TriMesh.Vertex> tree)
{
if (tree == null)
{
return(null);
}
List <TriMesh.Edge> treeMarks = new List <HalfEdgeMesh.Edge>();
treeMarks = new List <HalfEdgeMesh.Edge>();
TreeNode <TriMesh.Vertex> currentNode = tree.Root;
Queue <TreeNode <TriMesh.Vertex> > queue = new Queue <TreeNode <TriMesh.Vertex> >();
queue.Enqueue(currentNode);
do
{
currentNode = queue.Dequeue();
TreeNode <TriMesh.Vertex> currentChild = currentNode.LeftMostChild;
while (currentChild != null)
{
//Mark edge
TriMesh.Vertex v1 = currentNode.Attribute;
TriMesh.Vertex v2 = currentChild.Attribute;
foreach (TriMesh.HalfEdge hf in v1.HalfEdges)
{
if (hf.ToVertex == v2)
{
treeMarks.Add(hf.Edge);
break;
}
}
queue.Enqueue(currentChild);
currentChild = currentChild.RightSibling;
}
} while (queue.Count > 0);
return(treeMarks);
}
public DynamicTree <TriMesh.Vertex> BuildPrimalSpanningTree(TriMesh mesh, out TreeNode <TriMesh.Vertex>[] primalFlags)
{
DynamicTree <TriMesh.Vertex> primalSpanningTree = new DynamicTree <HalfEdgeMesh.Vertex>();
TreeNode <TriMesh.Vertex>[] flags = new TreeNode <HalfEdgeMesh.Vertex> [mesh.Vertices.Count];
foreach (TriMesh.Vertex v in mesh.Vertices)
{
if (!v.OnBoundary)
{
TreeNode <TriMesh.Vertex> root = new TreeNode <HalfEdgeMesh.Vertex>(v);
primalSpanningTree.Root = root;
flags[v.Index] = root;
break;
}
}
//Iterate verties to get spanning tree
Queue <TreeNode <TriMesh.Vertex> > queue = new Queue <TreeNode <TriMesh.Vertex> >();
queue.Enqueue(primalSpanningTree.Root);
do
{
TreeNode <TriMesh.Vertex> currentNode = queue.Dequeue();
TriMesh.Vertex currentVertex = currentNode.Attribute;
TriMesh.HalfEdge he = currentVertex.HalfEdge;
do
{
TriMesh.Vertex to = he.Opposite.FromVertex;
if (flags[to.Index] == null &&
!to.OnBoundary &&
to != primalSpanningTree.Root.Attribute)
{
TreeNode <TriMesh.Vertex> node = new TreeNode <HalfEdgeMesh.Vertex>(to);
flags[to.Index] = node;
currentNode.AddChild(node);
queue.Enqueue(node);
}
he = he.Opposite.Next;
} while (he != currentVertex.HalfEdge);
} while (queue.Count != 0);
primalFlags = flags;
return(primalSpanningTree);
}
public DynamicTree <TriMesh.Face> BuildDualSpanningCoTree(TriMesh mesh,
TreeNode <TriMesh.Vertex>[] primalFlags,
out TreeNode <TriMesh.Face>[] dualFlags)
{
DynamicTree <TriMesh.Face> dualSpanningTree = new DynamicTree <HalfEdgeMesh.Face>();
TreeNode <TriMesh.Face>[] flags = new TreeNode <HalfEdgeMesh.Face> [mesh.Faces.Count];
TreeNode <TriMesh.Face> root = new TreeNode <HalfEdgeMesh.Face>(mesh.Faces[0]);
dualSpanningTree.Root = root;
flags[mesh.Faces[0].Index] = root;
Queue <TreeNode <TriMesh.Face> > queue = new Queue <TreeNode <TriMesh.Face> >();
queue.Enqueue(dualSpanningTree.Root);
do
{
TreeNode <TriMesh.Face> currentNode = queue.Dequeue();
TriMesh.Face currentFace = currentNode.Attribute;
TriMesh.HalfEdge he = currentFace.HalfEdge;
do
{
TriMesh.Face toFace = he.Opposite.Face;
if (toFace != null &&
flags[toFace.Index] == null &&
toFace != dualSpanningTree.Root.Attribute &&
!InPrimalSpanningTree(he, primalFlags)
)
{
TreeNode <TriMesh.Face> node = new TreeNode <HalfEdgeMesh.Face>(toFace);
flags[toFace.Index] = node;
currentNode.AddChild(node);
queue.Enqueue(node);
}
he = he.Next;
} while (he != currentFace.HalfEdge);
} while (queue.Count != 0);
dualFlags = flags;
return(dualSpanningTree);
}
