/// <summary>
/// Assumes the halfedges of the given graph are correctly sorted around each vertex.
/// </summary>
/// <typeparam name="UV"></typeparam>
/// <typeparam name="UE"></typeparam>
/// <param name="graph"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
/// <returns></returns>
public TM CreateFromGraph <UV, UE>(HeGraph <UV, UE> graph, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
// TODO implement
throw new NotImplementedException();
}
/// <summary>
/// Appends a deep copy of the given graph to this graph.
/// Allows projection of element data to a different form.
/// </summary>
/// <typeparam name="UE"></typeparam>
/// <typeparam name="UV"></typeparam>
/// <param name="other"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
public void Append <UV, UE>(HeGraph <UV, UE> other, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
var vertsB = other.Vertices;
var hedgesB = other.Halfedges;
int nvA = Vertices.Count;
int nhA = Halfedges.Count;
// cache in case of appending to self
int nvB = vertsB.Count;
int nhB = hedgesB.Count;
// append new elements
for (int i = 0; i < nvB; i++)
{
AddVertex();
}
for (int i = 0; i < nhB; i += 2)
{
AddEdge();
}
// set vertex refs
for (int i = 0; i < nvB; i++)
{
var v0 = vertsB[i];
var v1 = Vertices[i + nvA];
// transfer attributes
setVertex?.Invoke(v1, v0);
if (v0.IsUnused)
{
continue;
}
v1.First = Halfedges[v0.First.Index + nhA];
}
// set halfedge refs
for (int i = 0; i < nhB; i++)
{
var he0 = hedgesB[i];
var he1 = Halfedges[i + nhA];
// transfer attributes
setHedge?.Invoke(he1, he0);
if (he0.IsUnused)
{
continue;
}
he1.Previous = Halfedges[he0.Previous.Index + nhA];
he1.Next = Halfedges[he0.Next.Index + nhA];
he1.Start = Vertices[he0.Start.Index + nvA];
}
}
/// <summary>
///
/// </summary>
/// <param name="path"></param>
/// <param name="graph"></param>
/// <param name="setVertexAttributes"></param>
/// <param name="setHedgeAttributes"></param>
public static void ReadFromJson <V, E, VA, EA>(string path, HeGraph <V, E> graph, Action <V, VA> setVertexAttributes = null, Action <E, EA> setHedgeAttributes = null)
where V : HeGraph <V, E> .Vertex
where E : HeGraph <V, E> .Halfedge
{
var buffer = CoreIO.DeserializeJson <HeGraphJsonBuffer <VA, EA> >(path);
buffer.ReadTo(graph, setVertexAttributes, setHedgeAttributes);
}
/// <summary>
///
/// </summary>
/// <typeparam name="UV"></typeparam>
/// <typeparam name="UE"></typeparam>
/// <param name="graph"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
/// <returns></returns>
public TG CreateCopy <UV, UE>(HeGraph <UV, UE> graph, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
var copy = Create(graph.Vertices.Capacity, graph.Halfedges.Capacity);
copy.Append(graph, setVertex, setHedge);
return(copy);
}
/// <summary>
///
/// </summary>
/// <typeparam name="V"></typeparam>
/// <typeparam name="E"></typeparam>
public static void WriteToJson <V, E, VA, EA>(HeGraph <V, E> graph, string path, Func <V, VA> getVertexAttributes = null, Func <E, EA> getHedgeAttributes = null)
where V : HeGraph <V, E> .Vertex
where E : HeGraph <V, E> .Halfedge
{
var buffer = new HeGraphJsonBuffer <VA, EA>();
buffer.WriteFrom(graph, getVertexAttributes, getHedgeAttributes);
CoreIO.SerializeJson(buffer, path);
}
/// <summary>
/// Writes the given graph to this buffer.
/// </summary>
public void WriteFrom <V, E>(HeGraph <V, E> graph, Func <V, VA> getVertexAttributes = null, Func <E, EA> getHedgeAttributes = null)
where V : HeGraph <V, E> .Vertex
where E : HeGraph <V, E> .Halfedge
{
var verts = graph.Vertices;
var hedges = graph.Halfedges;
_vertexRefs = new int[verts.Count];
_hedgeRefs = new int[hedges.Count][];
// write vertex topology
for (int i = 0; i < verts.Count; i++)
{
var v = verts[i];
_vertexRefs[i] = v.First ?? -1;
}
// write halfedge topology
for (int i = 0; i < hedges.Count; i++)
{
var he = hedges[i];
_hedgeRefs[i] = new int[]
{
he.Previous ?? -1,
he.Next,
he.Start
};
}
// write vertex attributes
if (getVertexAttributes != null)
{
_vertexAttributes = new VA[verts.Count];
for (int i = 0; i < verts.Count; i++)
{
_vertexAttributes[i] = getVertexAttributes(verts[i]);
}
}
// write halfedge attributes
if (getHedgeAttributes != null)
{
_hedgeAttributes = new EA[hedges.Count];
for (int i = 0; i < hedges.Count; i++)
{
_hedgeAttributes[i] = getHedgeAttributes(hedges[i]);
}
}
}
/// <summary>
///
/// </summary>
/// <typeparam name="UV"></typeparam>
/// <typeparam name="UE"></typeparam>
/// <param name="graph"></param>
/// <param name="componentIndices"></param>
/// <param name="edgeIndices"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
/// <returns></returns>
public TG[] CreateConnectedComponents <UV, UE>(HeGraph <UV, UE> graph, out int[] componentIndices, out int[] edgeIndices, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
int ne = graph.Edges.Count;
componentIndices = new int[ne];
edgeIndices = new int[ne];
return(CreateConnectedComponents(
graph,
Halfedge <UE> .CreateEdgeProperty(componentIndices),
Halfedge <UE> .CreateEdgeProperty(edgeIndices),
setVertex,
setHedge
));
}
/// <summary>
/// Throws an exception if the topology of the given mesh is not valid.
/// </summary>
/// <typeparam name="TV"></typeparam>
/// <typeparam name="TE"></typeparam>
/// <typeparam name="TF"></typeparam>
/// <param name="mesh"></param>
internal static void CheckTopology <TV, TE>(HeGraph <TV, TE> graph)
where TV : HeGraph <TV, TE> .Vertex
where TE : HeGraph <TV, TE> .Halfedge
{
var verts = graph.Vertices;
var hedges = graph.Halfedges;
// ensure halfedges are reciprocally linked
foreach (var he in hedges)
{
if (he.IsUnused)
{
continue;
}
if (he.Previous.Next != he && he.Next.Previous != he)
{
Throw();
}
if (he.Start.IsUnused)
{
Throw();
}
}
// ensure consistent start vertex during circulation
foreach (var v in verts)
{
foreach (var he in v.OutgoingHalfedges)
{
if (he.Start != v)
{
Throw();
}
}
}
void Throw()
{
throw new Exception("The topology of the given mesh is invalid");
}
}
/// <summary>
///
/// </summary>
/// <typeparam name="UV"></typeparam>
/// <typeparam name="UE"></typeparam>
/// <param name="graph"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
/// <returns></returns>
public TG[] CreateConnectedComponents <UV, UE>(HeGraph <UV, UE> graph, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
return(CreateConnectedComponents(graph, out int[] compIds, out int[] edgeIds, setVertex, setHedge));
}
/// <summary>
///
/// </summary>
/// <typeparam name="UV"></typeparam>
/// <typeparam name="UE"></typeparam>
/// <param name="graph"></param>
/// <param name="componentIndex"></param>
/// <param name="edgeIndex"></param>
/// <param name="setVertex"></param>
/// <param name="setHedge"></param>
/// <returns></returns>
public TG[] CreateConnectedComponents <UV, UE>(HeGraph <UV, UE> graph, Property <UE, int> componentIndex, Property <UE, int> edgeIndex, Action <TV, UV> setVertex = null, Action <TE, UE> setHedge = null)
where UV : HeGraph <UV, UE> .Vertex
where UE : HeGraph <UV, UE> .Halfedge
{
var vertices = graph.Vertices;
var hedges = graph.Halfedges;
int ncomp = graph.GetEdgeComponentIndices(componentIndex.Set);
var comps = new TG[ncomp];
// initialize components
for (int i = 0; i < comps.Length; i++)
{
comps[i] = Create();
}
// create component halfedges
for (int i = 0; i < hedges.Count; i += 2)
{
var heA = hedges[i];
if (heA.IsUnused)
{
continue;
}
var comp = comps[componentIndex.Get(heA)];
var heB = comp.AddEdge();
edgeIndex.Set(heA, heB.Index >> 1);
}
// set component halfedge->halfedge refs
for (int i = 0; i < hedges.Count; i++)
{
var heA0 = hedges[i];
if (heA0.IsUnused)
{
continue;
}
// the component to which heA0 was copied
var compHedges = comps[componentIndex.Get(heA0)].Halfedges;
var heA1 = heA0.NextAtStart;
// set refs
var heB0 = compHedges[(edgeIndex.Get(heA0) << 1) + (i & 1)];
var heB1 = compHedges[(edgeIndex.Get(heA1) << 1) + (heA1.Index & 1)];
heB0.MakeConsecutive(heB1);
// transfer attributes
setHedge?.Invoke(heB0, heA0);
}
// create component vertices
for (int i = 0; i < vertices.Count; i++)
{
var vA = vertices[i];
if (vA.IsUnused)
{
continue;
}
var heA = vA.First;
var comp = comps[componentIndex.Get(heA)];
var heB = comp.Halfedges[(edgeIndex.Get(heA) << 1) + (heA.Index & 1)];
// set vertex refs
var vB = comp.AddVertex();
vB.First = heB;
foreach (var he in heB.CirculateStart)
{
he.Start = vB;
}
// transfer attributes
setVertex?.Invoke(vB, vA);
}
return(comps);
}
/// <summary>
/// Reads this buffer to the given graph.
/// </summary>
public void ReadTo <V, E>(HeGraph <V, E> graph, Action <V, VA> setVertexAttributes = null, Action <E, EA> setHedgeAttributes = null)
where V : HeGraph <V, E> .Vertex
where E : HeGraph <V, E> .Halfedge
{
var verts = graph.Vertices;
var hedges = graph.Halfedges;
int nv = verts.Count;
int nhe = hedges.Count;
// add new vertices
for (int i = 0; i < _vertexRefs.Length; i++)
{
graph.AddVertex();
}
// add new halfedges
for (int i = 0; i < _hedgeRefs.Length; i += 2)
{
graph.AddEdge();
}
// link up vertices
for (int i = 0; i < _vertexRefs.Length; i++)
{
var v = verts[i + nv];
var first = _vertexRefs[i];
if (first > -1)
{
v.First = hedges[first + nhe];
}
}
// link up halfedges
for (int i = 0; i < _hedgeRefs.Length; i++)
{
var he = hedges[i + nhe];
var refs = _hedgeRefs[i];
var prev = refs[0];
if (prev != -1)
{
he.Previous = hedges[prev + nhe];
}
he.Next = hedges[refs[1] + nhe];
var start = refs[2];
if (start > -1)
{
he.Start = verts[start + nhe];
}
}
// TODO validate topology?
// set vertex attributes
if (setVertexAttributes != null)
{
for (int i = 0; i < _vertexAttributes.Length; i++)
{
setVertexAttributes(verts[i + nv], _vertexAttributes[i]);
}
}
// set vertex attributes
if (setHedgeAttributes != null)
{
for (int i = 0; i < _hedgeAttributes.Length; i++)
{
setHedgeAttributes(hedges[i + nhe], _hedgeAttributes[i]);
}
}
}
