Exemple #1
0
        public static VoronoiGraph ComputeVoronoiGraph(IEnumerable Datapoints)
        {
            BinaryPriorityQueue PQ             = new BinaryPriorityQueue();
            Hashtable           CurrentCircles = new Hashtable();
            VoronoiGraph        VG             = new VoronoiGraph();
            VNode RootNode = null;

            foreach (Vector V in Datapoints)
            {
                PQ.Push(new VDataEvent(V));
            }
            while (PQ.Count > 0)
            {
                VEvent      VE = PQ.Pop() as VEvent;
                VDataNode[] CircleCheckList;
                if (VE is VDataEvent)
                {
                    RootNode = VNode.ProcessDataEvent(VE as VDataEvent, RootNode, VG, VE.Y, out CircleCheckList);
                }
                else if (VE is VCircleEvent)
                {
                    CurrentCircles.Remove(((VCircleEvent)VE).NodeN);
                    if (!((VCircleEvent)VE).Valid)
                    {
                        continue;
                    }
                    RootNode = VNode.ProcessCircleEvent(VE as VCircleEvent, RootNode, VG, VE.Y, out CircleCheckList);
                }
                else
                {
                    throw new Exception("Got event of type " + VE.GetType().ToString() + "!");
                }
                foreach (VDataNode VD in CircleCheckList)
                {
                    if (CurrentCircles.ContainsKey(VD))
                    {
                        ((VCircleEvent)CurrentCircles[VD]).Valid = false;
                        CurrentCircles.Remove(VD);
                    }
                    VCircleEvent VCE = VNode.CircleCheckDataNode(VD, VE.Y);
                    if (VCE != null)
                    {
                        PQ.Push(VCE);
                        CurrentCircles[VD] = VCE;
                    }
                }
                if (VE is VDataEvent)
                {
                    Vector DP = ((VDataEvent)VE).DataPoint;
                    foreach (VCircleEvent VCE in CurrentCircles.Values)
                    {
                        if (MathTools.Dist(DP[0], DP[1], VCE.Center[0], VCE.Center[1]) < VCE.Y - VCE.Center[1] && Math.Abs(MathTools.Dist(DP[0], DP[1], VCE.Center[0], VCE.Center[1]) - (VCE.Y - VCE.Center[1])) > 1e-10)
                        {
                            VCE.Valid = false;
                        }
                    }
                }
            }
            VNode.CleanUpTree(RootNode);
            foreach (VoronoiEdge VE in VG.Edges)
            {
                if (VE.Done)
                {
                    continue;
                }
                if (VE.VVertexB == Fortune.VVUnkown)
                {
                    VE.AddVertex(Fortune.VVInfinite);
                    if (Math.Abs(VE.LeftData[1] - VE.RightData[1]) < 1e-10 && VE.LeftData[0] < VE.RightData[0])
                    {
                        Vector T = VE.LeftData;
                        VE.LeftData  = VE.RightData;
                        VE.RightData = T;
                    }
                }
            }

            ArrayList MinuteEdges = new ArrayList();

            foreach (VoronoiEdge VE in VG.Edges)
            {
                if (!VE.IsPartlyInfinite && VE.VVertexA.Equals(VE.VVertexB))
                {
                    MinuteEdges.Add(VE);
                    // prevent rounding errors from expanding to holes
                    foreach (VoronoiEdge VE2 in VG.Edges)
                    {
                        if (VE2.VVertexA.Equals(VE.VVertexA))
                        {
                            VE2.VVertexA = VE.VVertexA;
                        }
                        if (VE2.VVertexB.Equals(VE.VVertexA))
                        {
                            VE2.VVertexB = VE.VVertexA;
                        }
                    }
                }
            }
            foreach (VoronoiEdge VE in MinuteEdges)
            {
                VG.Edges.Remove(VE);
            }



            return(VG);
        }