public static VNode ProcessCircleEvent(VCircleEvent e, VNode root, VoronoiGraph vg, out VDataNode[] circleCheckList)
{
VEdgeNode eo;
var b = e.NodeN;
var a = LeftDataNode(b);
var 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
}
var eu = (VEdgeNode)b.Parent;
circleCheckList = new[] { a, c };
//1. Create the new Vertex
var vNew = new Vector2((float)e.CenterX, (float)e.CenterY);
vg.AddVertex(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
var ve = new VoronoiEdge {
LeftData = a.DataPoint, RightData = c.DataPoint
};
ve.AddVertex(vNew);
vg.AddEdge(ve);
var ven = new VEdgeNode(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>
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[0]);
//2. Create the subtree (ONE Edge, but two VEdgeNodes)
var ve = new VoronoiEdge
{
LeftData = ((VDataNode)c).DataPoint,
RightData = e.DataPoint,
V1 = Edge.GetUnknownVertex(),
V2 = Edge.GetUnknownVertex()
};
vg.AddEdge(ve);
VNode subRoot;
if (Math.Abs(ve.LeftData[1] - ve.RightData[1]) < 1e-10)
{
if (ve.LeftData[0] < ve.RightData[0])
{
subRoot = new VEdgeNode(ve, false)
{
Left = new VDataNode(ve.LeftData), Right = new VDataNode(ve.RightData)
};
}
else
{
subRoot = new VEdgeNode(ve, true)
{
Left = new VDataNode(ve.RightData), Right = new VDataNode(ve.LeftData)
};
}
circleCheckList = new[] { (VDataNode)subRoot.Left, (VDataNode)subRoot.Right };
}
else
{
subRoot = new VEdgeNode(ve, false)
{
Left = new VDataNode(ve.LeftData),
Right = new VEdgeNode(ve, true)
{
Left = new VDataNode(ve.RightData), 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);
}