private void Replace(VNode childOld, VNode childNew) { if (Left == childOld) Left = childNew; else if (Right == childOld) Right = childNew; else throw new Exception("Child not found!"); childOld.Parent = null; }
private static VDataNode LeftDataNode(VNode current) { VNode c = current; //1. Up do { if (c.Parent == null) return null; if (c.Parent.Left == c) { c = c.Parent; continue; } c = c.Parent; break; } while (true); //2. One Left c = c.Left; //3. Down while (c.Right != null) c = c.Right; return (VDataNode)c; // Cast statt 'as' damit eine Exception kommt }
public static void CleanUpTree(VNode root) { if (root is VDataNode) return; VEdgeNode ve = root as VEdgeNode; if (ve != null) { while (ve.Edge.VVertexB == Fortune.VVUnkown) { ve.Edge.AddVertex(Fortune.VVInfinite); } if (ve.Flipped) { Vector2 t = ve.Edge.LeftData; ve.Edge.LeftData = ve.Edge.RightData; ve.Edge.RightData = t; } ve.Edge.Done = true; } CleanUpTree(root.Left); CleanUpTree(root.Right); }
public static VNode ProcessCircleEvent(VCircleEvent e, VNode root, VoronoiGraph vg, out VDataNode[] circleCheckList) { VEdgeNode eo; VDataNode b = e.NodeN; VDataNode a = LeftDataNode(b); VDataNode c = RightDataNode(b); if (a == null || b.Parent == null || c == null || !a.DataPoint.Equals(e.NodeL.DataPoint) || !c.DataPoint.Equals(e.NodeR.DataPoint)) { circleCheckList = new VDataNode[] { }; return root; // Abbruch da sich der Graph verändert hat } VEdgeNode eu = (VEdgeNode)b.Parent; circleCheckList = new[] { a, c }; //1. Create the new Vertex Vector2 vNew = new Vector2(e.Center.X, e.Center.Y); // VNew[0] = Fortune.ParabolicCut(a.DataPoint[0], a.DataPoint[1], c.DataPoint[0], c.DataPoint[1], ys); // VNew[1] = (ys + a.DataPoint[1])/2 - 1/(2*(ys-a.DataPoint[1]))*(VNew[0]-a.DataPoint[0])*(VNew[0]-a.DataPoint[0]); vg.Vertices.Add(vNew); //2. Find out if a or c are in a distand part of the tree (the other is then b's sibling) and assign the new vertex if (eu.Left == b) { // c is sibling eo = EdgeToRightDataNode(a); // replace eu by eu's Right eu.Parent.Replace(eu, eu.Right); } else { // a is sibling eo = EdgeToRightDataNode(b); // replace eu by eu's Left eu.Parent.Replace(eu, eu.Left); } eu.Edge.AddVertex(vNew); // ///////////////////// uncertain // if (eo==eu) // return root; // ///////////////////// eo.Edge.AddVertex(vNew); //2. Replace eo by new Edge VoronoiEdge ve = new VoronoiEdge(); ve.LeftData = a.DataPoint; ve.RightData = c.DataPoint; ve.AddVertex(vNew); vg.Edges.Add(ve); VEdgeNode ven = new VEdgeNode(ve, false); ven.Left = eo.Left; ven.Right = eo.Right; if (eo.Parent == null) return ven; eo.Parent.Replace(eo, ven); return root; }
/// <summary> /// Will return the new root (unchanged except in start-up) /// </summary> public static VNode ProcessDataEvent(VDataEvent e, VNode root, VoronoiGraph vg, double ys, out VDataNode[] circleCheckList) { if (root == null) { root = new VDataNode(e.DataPoint); circleCheckList = new[] { (VDataNode)root }; return root; } //1. Find the node to be replaced VNode c = FindDataNode(root, ys, e.DataPoint.X); //2. Create the subtree (ONE Edge, but two VEdgeNodes) VoronoiEdge ve = new VoronoiEdge(); ve.LeftData = ((VDataNode)c).DataPoint; ve.RightData = e.DataPoint; ve.VVertexA = Fortune.VVUnkown; ve.VVertexB = Fortune.VVUnkown; vg.Edges.Add(ve); VNode subRoot; if (Math.Abs(ve.LeftData.Y - ve.RightData.Y) < 1e-10) { if (ve.LeftData.X < ve.RightData.X) { subRoot = new VEdgeNode(ve, false); subRoot.Left = new VDataNode(ve.LeftData); subRoot.Right = new VDataNode(ve.RightData); } else { subRoot = new VEdgeNode(ve, true); subRoot.Left = new VDataNode(ve.RightData); subRoot.Right = new VDataNode(ve.LeftData); } circleCheckList = new[] { (VDataNode)subRoot.Left, (VDataNode)subRoot.Right }; } else { subRoot = new VEdgeNode(ve, false); subRoot.Left = new VDataNode(ve.LeftData); subRoot.Right = new VEdgeNode(ve, true); subRoot.Right.Left = new VDataNode(ve.RightData); subRoot.Right.Right = new VDataNode(ve.LeftData); circleCheckList = new[] { (VDataNode)subRoot.Left, (VDataNode)subRoot.Right.Left, (VDataNode)subRoot.Right.Right }; } //3. Apply subtree if (c.Parent == null) return subRoot; c.Parent.Replace(c, subRoot); return root; }
private static VDataNode FindDataNode(VNode root, double ys, double x) { VNode c = root; do { if (c is VDataNode) return (VDataNode)c; if (((VEdgeNode)c).Cut(ys, x) < 0) c = c.Left; else c = c.Right; } while (true); }
private static VEdgeNode EdgeToRightDataNode(VNode current) { VNode c = current; //1. Up do { if (c.Parent == null) throw new Exception("No Left Leaf found!"); if (c.Parent.Right == c) { c = c.Parent; continue; } c = c.Parent; break; } while (true); return (VEdgeNode)c; }
/// <summary> /// Calculates a list of edges and junction vertices by using the specified points. /// This defaults to not using any tolerance for determining if points are equal, /// and will not use the cleanup algorithm, which breaks the HandleBoundaries /// method in the Voronoi class. /// </summary> /// <param name="vertices">The original points to use during the calculation</param> /// <returns>A VoronoiGraph structure containing the output geometries</returns> public static VoronoiGraph ComputeVoronoiGraph(double[] vertices) { //BinaryPriorityQueue pq = new BinaryPriorityQueue(); SortedDictionary <VEvent, VEvent> pq = new SortedDictionary <VEvent, VEvent>(); Dictionary <VDataNode, VCircleEvent> currentCircles = new Dictionary <VDataNode, VCircleEvent>(); VoronoiGraph vg = new VoronoiGraph(); VNode rootNode = null; for (int i = 0; i < vertices.Length / 2; i++) { //pq.Push(new VDataEvent(new Vector(vertex))); VDataEvent e = new VDataEvent(new Vector2(vertices, i * 2)); if (pq.ContainsKey(e)) { continue; } pq.Add(e, e); } while (pq.Count > 0) { //VEvent ve = pq.Pop() as VEvent; VEvent ve = pq.First().Key; pq.Remove(ve); VDataNode[] circleCheckList = new VDataNode[] { }; 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, out circleCheckList); } else if (ve != null) { throw new Exception("Got event of type " + ve.GetType() + "!"); } foreach (VDataNode vd in circleCheckList) { if (currentCircles.ContainsKey(vd)) { currentCircles[vd].Valid = false; currentCircles.Remove(vd); } if (ve == null) { continue; } VCircleEvent vce = VNode.CircleCheckDataNode(vd, ve.Y); if (vce == null) { continue; } //pq.Push(vce); pq.Add(vce, vce); currentCircles[vd] = vce; } if (!(ve is VDataEvent)) { continue; } Vector2 dp = ((VDataEvent)ve).DataPoint; foreach (VCircleEvent vce in currentCircles.Values) { if (MathTools.Dist(dp.X, dp.Y, vce.Center.X, vce.Center.Y) < vce.Y - vce.Center.Y && Math.Abs(MathTools.Dist(dp.X, dp.Y, vce.Center.X, vce.Center.Y) - (vce.Y - vce.Center.Y)) > 1e-10) { vce.Valid = false; } } } // This is where the MapWindow version should exit since it uses the HandleBoundaries // function instead. The following code is needed for Benjamin Ditter's original process to work. if (!DoCleanup) { return(vg); } VNode.CleanUpTree(rootNode); foreach (VoronoiEdge ve in vg.Edges) { if (ve.Done) { continue; } if (ve.VVertexB != VVUnkown) { continue; } ve.AddVertex(VVInfinite); if (Math.Abs(ve.LeftData.Y - ve.RightData.Y) < 1e-10 && ve.LeftData.X < ve.RightData.X) { Vector2 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)) { continue; } 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); }