public void GenerateEuclideanOurNeoKruskalMST(int bucket)
{
if (VertexList.Count == 0)
{
return;
}
DateTime start = DateTime.Now;
NeoDisjointSet <Vertex> disjointSet = new NeoDisjointSet <Vertex>(VertexList);
EdgeSolution.Clear();
C5.IPriorityQueue <Edge>[] heap2 = new C5.IntervalHeap <Edge> [bucket];
C5.IPriorityQueue <Edge> heap = new C5.IntervalHeap <Edge>(new EdgeComparer());
for (int i = 0; i < heap2.Length; i++)
{
heap2[i] = new C5.IntervalHeap <Edge>(new EdgeComparer());
}
//this.VisitedVertex = VertexList.Count;
for (int i = 0; i < VertexList.Count - 1; i++)
{
for (int j = i + 1; j < VertexList.Count; j++)
{
Edge e = new Edge(VertexList[i], VertexList[j]);
heap.Add(e);
}
}
double max = heap.FindMax().Length;
double min = heap.FindMin().Length;
while (heap.Count > 0)
{
Edge s = heap.DeleteMin();
heap2[(int)Math.Floor((((s.Length - min) / (max - min)) * (bucket - 1)))].Add(s);
}
for (int i = 0; i < bucket && disjointSet.Count > 0; i++)
{
while (heap2[i].Count > 0 && disjointSet.Count > 0)
{
Edge s = heap2[i].DeleteMin();
if (!disjointSet.IsSameSet(s.VertexFirst, s.VertexSecond))
{
disjointSet.Union(s.VertexFirst, s.VertexSecond);
EdgeSolution.Add(s);
}
}
}
Debug.WriteLine((DateTime.Now - start).TotalMilliseconds + " ms");
//this.VisitedVertex = VertexList.Count;
}
J2KImage GetHighestPriorityImage()
{
J2KImage image = null;
lock (m_syncRoot)
{
if (m_priorityQueue.Count > 0)
{
try { image = m_priorityQueue.FindMax(); }
catch (Exception) { }
}
}
return(image);
}
private J2KImage GetHighestPriorityImage()
{
J2KImage image = null;
lock (m_priorityQueue)
{
if (!m_priorityQueue.IsEmpty)
{
try { image = m_priorityQueue.FindMax(); }
catch (Exception) { }
}
}
return(image);
}
private bool VertexGuidedSearch(int iv, int iw)
{
var v = _nodes[iv];
var w = _nodes[iw];
f.Clear();
b.Clear();
f.Add(w);
w.Value.InF = true;
b.Add(v);
v.Value.InB = true;
w.Value.OutEnum = w.Value.Outgoing.GetEnumerator();
w.Value.OutEnum.MoveNext();
v.Value.InEnum = v.Value.Incoming.GetEnumerator();
v.Value.InEnum.MoveNext();
var fl = new C5.IntervalHeap<SGTNode<HKMSTNode>>();
var bl = new C5.IntervalHeap<SGTNode<HKMSTNode>>();
if (w.Value.OutEnum.Current != null)
fl.Add(w);
if (v.Value.InEnum.Current != null)
bl.Add(v);
// For ease of notation, we adopt the convention that the
// minimum of an empty set is bigger than any other value and the maximum of an empty
// set is smaller than any other value.
SGTNode<HKMSTNode> u = null;
SGTNode<HKMSTNode> z = null;
if(fl.Count > 0)
u = fl.FindMin();
if(bl.Count > 0)
z = bl.FindMax();
while (fl.Count > 0 && bl.Count > 0 && (u == z || _nodeOrder.Query(z, u)))
{
// SEARCH-STEP(vertex u, vertex z)
var x = u.Value.OutEnum.Current;
var y = z.Value.InEnum.Current;
u.Value.OutEnum.MoveNext();
z.Value.InEnum.MoveNext();
if (u.Value.OutEnum.Current == null)
fl.DeleteMin();
if (z.Value.InEnum.Current == null)
bl.DeleteMax();
if(x.Value.InB)
{
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
return false; // Pair(uz.from, x.Current);
}
else if (y.Value.InF)
{
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
return false; // Pair(y.Current, uz.to);
}
if (!x.Value.InF)
{
f.Add(x);
x.Value.InF = true;
x.Value.OutEnum = x.Value.Outgoing.GetEnumerator();
x.Value.OutEnum.MoveNext();
if (x.Value.OutEnum.Current != null)
fl.Add(x);
}
if (!y.Value.InB)
{
b.Add(y);
y.Value.InB = true;
y.Value.InEnum = y.Value.Incoming.GetEnumerator();
y.Value.InEnum.MoveNext();
if (y.Value.InEnum.Current != null)
bl.Add(y);
}
// End of SEARCH-STEP(vertex u, vertex z)
if (fl.Count > 0)
u = fl.FindMin();
if (bl.Count > 0)
z = bl.FindMax();
}
// let t = min({v}∪{x ∈ F|out(x) = null} and reorder the vertices in F< and B> as discussed previously.
var vAndf = f.FindAll(item => item.Value.OutEnum.Current != null);
vAndf.Add(v);
var t = vAndf.Min();
// Let F< = { x ∈ F | x < t} and
var fb = f.FindAll(item => item.Label < t.Label);
// B > = { y ∈ B | y > t}.
var bf = b.FindAll(item => item.Label > t.Label);
if(t == v)
{
// move all vertices in fb just after t ... bf is empty
foreach (var node in fb)
_nodeOrder.Remove(node);
if(fb.Count > 1)
fb = TopoSort(fb);
if (fb.Count > 0)
{
var prev = _nodeOrder.insertAfter(t, fb[0]);
for (int i = 1; i < fb.Count; i++)
prev = _nodeOrder.insertAfter(prev, fb[i]);
}
}
if (t.Label < v.Label)
{
// move all vertices in fb just before t and all vertices in bf just before all vertices in fb
// This is required as the articles states
if (bf.Count > 1)
bf = TopoSort(bf);
if (fb.Count > 1)
fb = TopoSort(fb);
foreach (var node in bf)
_nodeOrder.Remove(node);
foreach (var node in fb)
_nodeOrder.Remove(node);
foreach (var item in fb)
bf.Add(item);
if (bf.Count > 0)
{
var prev = _nodeOrder.insertBefore(t, bf[bf.Count-1]);
if(bf.Count > 1)
{
for (int i = bf.Count - 2; i >= 0; i--)
prev = _nodeOrder.insertBefore(prev, bf[i]);
}
}
}
// reset bools
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
// all done add to Outgoing and Incoming
_nodes[iv].Value.Outgoing.Add(_nodes[iw]);
_nodes[iw].Value.Incoming.Add(_nodes[iv]);
return true;
}
public void GenerateEuclideanOurNeoKruskalMST(int bucket)
{
if (VertexList.Count == 0)
return;
DateTime start = DateTime.Now;
NeoDisjointSet<Vertex> disjointSet = new NeoDisjointSet<Vertex>(VertexList);
EdgeSolution.Clear();
C5.IPriorityQueue<Edge>[] heap2 = new C5.IntervalHeap<Edge>[bucket];
C5.IPriorityQueue<Edge> heap = new C5.IntervalHeap<Edge>(new EdgeComparer());
for (int i = 0; i < heap2.Length; i++)
{
heap2[i] = new C5.IntervalHeap<Edge>(new EdgeComparer());
}
//this.VisitedVertex = VertexList.Count;
for (int i = 0; i < VertexList.Count - 1; i++)
for (int j = i + 1; j < VertexList.Count; j++)
{
Edge e = new Edge(VertexList[i], VertexList[j]);
heap.Add(e);
}
double max = heap.FindMax().Length;
double min = heap.FindMin().Length;
while (heap.Count > 0)
{
Edge s = heap.DeleteMin();
heap2[(int)Math.Floor((((s.Length - min) / (max - min)) * (bucket - 1)))].Add(s);
}
for (int i = 0; i < bucket && disjointSet.Count > 0; i++)
{
while (heap2[i].Count > 0 && disjointSet.Count > 0)
{
Edge s = heap2[i].DeleteMin();
if (!disjointSet.IsSameSet(s.VertexFirst, s.VertexSecond))
{
disjointSet.Union(s.VertexFirst, s.VertexSecond);
EdgeSolution.Add(s);
}
}
}
Debug.WriteLine((DateTime.Now - start).TotalMilliseconds + " ms");
//this.VisitedVertex = VertexList.Count;
}
public KeyValuePair <TKey, TValue> PeekMax() => _heap.FindMax();
/// <summary>
/// Returns the maximum item
/// </summary>
/// <returns></returns>
public T FindMax()
{
IndexedItem item = _priQueue.FindMax();
return(item.Value);
}
private bool VertexGuidedSearch(int iv, int iw)
{
var v = _nodes[iv];
var w = _nodes[iw];
f.Clear();
b.Clear();
f.Add(w);
w.Value.InF = true;
b.Add(v);
v.Value.InB = true;
w.Value.OutEnum = w.Value.Outgoing.GetEnumerator();
w.Value.OutEnum.MoveNext();
v.Value.InEnum = v.Value.Incoming.GetEnumerator();
v.Value.InEnum.MoveNext();
var fl = new C5.IntervalHeap <SGTNode <HKMSTNode> >();
var bl = new C5.IntervalHeap <SGTNode <HKMSTNode> >();
if (w.Value.OutEnum.Current != null)
{
fl.Add(w);
}
if (v.Value.InEnum.Current != null)
{
bl.Add(v);
}
// For ease of notation, we adopt the convention that the
// minimum of an empty set is bigger than any other value and the maximum of an empty
// set is smaller than any other value.
SGTNode <HKMSTNode> u = null;
SGTNode <HKMSTNode> z = null;
if (fl.Count > 0)
{
u = fl.FindMin();
}
if (bl.Count > 0)
{
z = bl.FindMax();
}
while (fl.Count > 0 && bl.Count > 0 && (u == z || _nodeOrder.Query(z, u)))
{
// SEARCH-STEP(vertex u, vertex z)
var x = u.Value.OutEnum.Current;
var y = z.Value.InEnum.Current;
u.Value.OutEnum.MoveNext();
z.Value.InEnum.MoveNext();
if (u.Value.OutEnum.Current == null)
{
fl.DeleteMin();
}
if (z.Value.InEnum.Current == null)
{
bl.DeleteMax();
}
if (x.Value.InB)
{
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
return(false); // Pair(uz.from, x.Current);
}
else if (y.Value.InF)
{
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
return(false); // Pair(y.Current, uz.to);
}
if (!x.Value.InF)
{
f.Add(x);
x.Value.InF = true;
x.Value.OutEnum = x.Value.Outgoing.GetEnumerator();
x.Value.OutEnum.MoveNext();
if (x.Value.OutEnum.Current != null)
{
fl.Add(x);
}
}
if (!y.Value.InB)
{
b.Add(y);
y.Value.InB = true;
y.Value.InEnum = y.Value.Incoming.GetEnumerator();
y.Value.InEnum.MoveNext();
if (y.Value.InEnum.Current != null)
{
bl.Add(y);
}
}
// End of SEARCH-STEP(vertex u, vertex z)
if (fl.Count > 0)
{
u = fl.FindMin();
}
if (bl.Count > 0)
{
z = bl.FindMax();
}
}
// let t = min({v}∪{x ∈ F|out(x) = null} and reorder the vertices in F< and B> as discussed previously.
var vAndf = f.FindAll(item => item.Value.OutEnum.Current != null);
vAndf.Add(v);
var t = vAndf.Min();
// Let F< = { x ∈ F | x < t} and
var fb = f.FindAll(item => item.Label < t.Label);
// B > = { y ∈ B | y > t}.
var bf = b.FindAll(item => item.Label > t.Label);
if (t == v)
{
// move all vertices in fb just after t ... bf is empty
foreach (var node in fb)
{
_nodeOrder.Remove(node);
}
if (fb.Count > 1)
{
fb = TopoSort(fb);
}
if (fb.Count > 0)
{
var prev = _nodeOrder.insertAfter(t, fb[0]);
for (int i = 1; i < fb.Count; i++)
{
prev = _nodeOrder.insertAfter(prev, fb[i]);
}
}
}
if (t.Label < v.Label)
{
// move all vertices in fb just before t and all vertices in bf just before all vertices in fb
// This is required as the articles states
if (bf.Count > 1)
{
bf = TopoSort(bf);
}
if (fb.Count > 1)
{
fb = TopoSort(fb);
}
foreach (var node in bf)
{
_nodeOrder.Remove(node);
}
foreach (var node in fb)
{
_nodeOrder.Remove(node);
}
foreach (var item in fb)
{
bf.Add(item);
}
if (bf.Count > 0)
{
var prev = _nodeOrder.insertBefore(t, bf[bf.Count - 1]);
if (bf.Count > 1)
{
for (int i = bf.Count - 2; i >= 0; i--)
{
prev = _nodeOrder.insertBefore(prev, bf[i]);
}
}
}
}
// reset bools
f.ForEach(item => item.Value.InF = false);
b.ForEach(item => item.Value.InB = false);
// all done add to Outgoing and Incoming
_nodes[iv].Value.Outgoing.Add(_nodes[iw]);
_nodes[iw].Value.Incoming.Add(_nodes[iv]);
return(true);
}