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;
}
