/// <summary> /// Processes the VCircleEvent. /// </summary> /// <param name="e">The VCircleEvent.</param> /// <param name="root">The root node.</param> /// <param name="vg">The VoronoiGraph.</param> /// <param name="circleCheckList">The circle check list.</param> /// <returns>The resulting root.</returns> 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); // abbort because graph changed } VEdgeNode eu = (VEdgeNode)b.Parent; circleCheckList = new[] { a, c }; // 1. Create the new Vertex Vector2 vNew = new(e.Center.X, e.Center.Y); 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); eo.Edge.AddVertex(vNew); // 2. Replace eo by new Edge VoronoiEdge ve = new() { LeftData = a.DataPoint, RightData = c.DataPoint }; ve.AddVertex(vNew); vg.Edges.Add(ve); VEdgeNode ven = new(ve, false) { Left = eo.Left, 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> /// <param name="e">The VDataEvent.</param> /// <param name="root">The root node.</param> /// <param name="vg">The VoronoiGraph.</param> /// <param name="ys">The ys.</param> /// <param name="circleCheckList">The circle check list.</param> /// <returns>The new root.</returns> public static VNode ProcessDataEvent(VDataEvent e, VNode root, VoronoiGraph vg, double ys, out VDataNode[] circleCheckList)