/// <summary>
/// Replace the specified ChildOld and ChildNew.
/// </summary>
/// <param name='ChildOld'>
/// Child old.
/// </param>
/// <param name='ChildNew'>
/// Child new.
/// </param>
/// <exception cref='Exception'>
/// Represents errors that occur during application execution.
/// </exception>
public 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;
}
/// <summary>
/// Will return the new root (unchanged except in start-up)
/// </summary>
/// <summary>
/// Processes the data event.
/// </summary>
/// <returns>
/// The data event.
/// </returns>
/// <param name='e'>
/// E.
/// </param>
/// <param name='Root'>
/// Root.
/// </param>
/// <param name='VG'>
/// V.
/// </param>
/// <param name='ys'>
/// Ys.
/// </param>
/// <param name='CircleCheckList'>
/// Circle check list.
/// </param>
/// <exception cref='Exception'>
/// Represents errors that occur during application execution.
/// </exception>
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 as VDataNode};
return Root;
}
//1. Find the node to be replaced
VNode C = VNode.FindDataNode( Root, ys, e.DataPoint.X );
VDataNode cData = C as VDataNode;
if( cData == null ) {
throw new Exception( "Can't cast to data node" );
}
//2. Create the subtree (ONE Edge, but two VEdgeNodes)
VoronoiEdge VE = new VoronoiEdge();
VE.LeftData = cData.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 as VDataNode, SubRoot.Right as VDataNode};
} 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 as VDataNode, SubRoot.Right.Left as VDataNode, SubRoot.Right.Right as VDataNode};
}
//3. Apply subtree
if( C.Parent == null ) {
return SubRoot;
}
C.Parent.Replace( C, SubRoot );
return Root;
}
/// <summary>
/// Firsts the data node.
/// </summary>
/// <returns>
/// The data node.
/// </returns>
/// <param name='Root'>
/// Root.
/// </param>
public static VDataNode FirstDataNode( VNode Root )
{
VNode C = Root;
while( C.Left!=null ) {
C = C.Left;
}
return C as VDataNode;
}
/// <summary>
/// Processes the circle event.
/// </summary>
/// <returns>
/// The circle event.
/// </returns>
/// <param name='e'>
/// E.
/// </param>
/// <param name='Root'>
/// Root.
/// </param>
/// <param name='VG'>
/// V.
/// </param>
/// <param name='ys'>
/// Ys.
/// </param>
/// <param name='CircleCheckList'>
/// Circle check list.
/// </param>
public static VNode ProcessCircleEvent( VCircleEvent e, VNode Root, VoronoiGraph VG, double ys, out VDataNode[] CircleCheckList )
{
VDataNode a;
VDataNode b;
VDataNode c;
VEdgeNode eu;
VEdgeNode eo;
b = e.NodeN;
a = VNode.LeftDataNode( b );
c = VNode.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 ver 0/00ndert hat
}
eu = b.Parent as VEdgeNode;
CircleCheckList = new VDataNode[] {a,c};
//1. Create the new Vertex
Vector2D VNew = new Vector2D( e.Center.X, e.Center.Y );
VG.Vertizes.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 = VNode.EdgeToRightDataNode( a );
// replace eu by eu's Right
eu.Parent.Replace( eu, eu.Right );
} else { // a is sibling
eo = VNode.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 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>
/// Finds the data node.
/// </summary>
/// <returns>
/// The data node.
/// </returns>
/// <param name='Root'>
/// Root.
/// </param>
/// <param name='ys'>
/// Ys.
/// </param>
/// <param name='x'>
/// X.
/// </param>
/// <exception cref='Exception'>
/// Represents errors that occur during application execution.
/// </exception>
public static VDataNode FindDataNode( VNode Root, double ys, double x )
{
VNode C = Root;
do {
if( C is VDataNode ) {
return C as VDataNode;
}
VEdgeNode cEdge = C as VEdgeNode;
if( cEdge == null ) {
throw new Exception( "Can't cast to edge node" );
}
if( cEdge.Cut( ys, x ) < 0 ) {
C = C.Left;
}
else {
C = C.Right;
}
} while(true);
}