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;
}