/// <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>
/// 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>
/// Circles the check data node.
/// </summary>
/// <returns>
/// The check data node.
/// </returns>
/// <param name='n'>
/// N.
/// </param>
/// <param name='ys'>
/// Ys.
/// </param>
public static VCircleEvent CircleCheckDataNode( VDataNode n, double ys )
{
VDataNode l = VNode.LeftDataNode( n );
VDataNode r = VNode.RightDataNode( n );
if( l == null || r == null || l.DataPoint == r.DataPoint || l.DataPoint == n.DataPoint || n.DataPoint == r.DataPoint ) {
return null;
}
if( MathTools.ccw( l.DataPoint.X, l.DataPoint.Y, n.DataPoint.X, n.DataPoint.Y, r.DataPoint.X, r.DataPoint.Y, false ) <= 0 ) {
return null;
}
Vector2D Center = Fortune.CircumCircleCenter( l.DataPoint, n.DataPoint, r.DataPoint );
VCircleEvent VC = new VCircleEvent();
VC.NodeN = n;
VC.NodeL = l;
VC.NodeR = r;
VC.Center = Center;
VC.Valid = true;
if( VC.Y >= ys ) {
return VC;
}
return null;
}
/// <summary>
/// Rights the data node.
/// </summary>
/// <returns>
/// The data node.
/// </returns>
/// <param name='Current'>
/// Current.
/// </param>
public static VDataNode RightDataNode( VDataNode Current )
{
VNode C = Current;
//1. Up
do {
if( C.Parent == null ) {
return null;
}
if( C.Parent.Right == C ) {
C = C.Parent;
continue;
} else {
C = C.Parent;
break;
}
} while(true);
//2. One Right
C = C.Right;
//3. Down
while( C.Left != null ) {
C = C.Left;
}
return C as VDataNode; // Cast statt 'as' damit eine Exception kommt
}
/// <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>
/// 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>
/// Edges to right data node.
/// </summary>
/// <returns>
/// The to right data node.
/// </returns>
/// <param name='Current'>
/// Current.
/// </param>
/// <exception cref='Exception'>
/// Represents errors that occur during application execution.
/// </exception>
public static VEdgeNode EdgeToRightDataNode( VDataNode 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;
} else {
C = C.Parent;
break;
}
} while(true);
return C as VEdgeNode;
}
