weka.gui.graphvisualizer.HierarchicalBCEngine Maven / Gradle / Ivy
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* There have been a few modifications made, however. The crossings function is
* changed as it was non-linear in time complexity. Furthermore, we don't have
* any interconnection matrices for each level, instead we just have one big
* interconnection matrix for the whole graph and a int[][] array which stores
* the vertices present in each level.
*
* @author Ashraf M. Kibriya ([email protected])
* @version $Revision: 10502 $ - 24 Apr 2003 - Initial version (Ashraf M.
* Kibriya)
*
*/
public class HierarchicalBCEngine implements GraphConstants, LayoutEngine {
/** FastVector containing nodes and edges */
protected ArrayList m_nodes;
protected ArrayList m_edges;
/**
* FastVector containing listeners for layoutCompleteEvent generated by this
* LayoutEngine
*/
protected ArrayList layoutCompleteListeners;
/** Interconnection matrix for the graph */
protected int graphMatrix[][];
/**
* Array containing the indices of nodes in each level. The nodeLevels.length
* is equal to the number of levels
*/
protected int nodeLevels[][];
/** The nodeWidth and nodeHeight */
protected int m_nodeWidth, m_nodeHeight;
/*
* The following radio buttons control the way the layout is performed. If any
* of the following is changed then we need to perform a complete relayout
*/
protected JRadioButton m_jRbNaiveLayout;
protected JRadioButton m_jRbPriorityLayout;
protected JRadioButton m_jRbTopdown;
protected JRadioButton m_jRbBottomup;
/**
* controls edge concentration by concentrating multilple singular dummy child
* nodes into one plural dummy child node
*/
protected JCheckBox m_jCbEdgeConcentration;
/**
* The panel containing extra options, specific to this LayoutEngine, for
* greater control over layout of the graph
*/
protected JPanel m_controlsPanel;
/**
* The progress bar to show the progress of the layout process
*/
protected JProgressBar m_progress;
/**
* This tells the the LayoutGraph method if a completeReLayout should be
* performed when it is called.
*/
protected boolean m_completeReLayout = false;
/**
* This contains the original size of the nodes vector when it was passed in
* through the constructor, before adding all the dummy vertices
*/
private int origNodesSize;
/**
* Constructor - takes in FastVectors of nodes and edges, and the initial
* width and height of a node
*/
public HierarchicalBCEngine(ArrayList nodes,
ArrayList edges, int nodeWidth, int nodeHeight) {
m_nodes = nodes;
m_edges = edges;
m_nodeWidth = nodeWidth;
m_nodeHeight = nodeHeight;
makeGUIPanel(false);
}
/**
* Constructor - takes in FastVectors of nodes and edges, the initial width
* and height of a node, and a boolean value to indicate if the edges should
* be concentrated.
*
* @param nodes - FastVector containing all the nodes
* @param edges - FastVector containing all the edges
* @param nodeWidth - A node's allowed width
* @param nodeHeight - A node's allowed height
* @param edgeConcentration - True: if want to concentrate edges, False:
* otherwise
*/
public HierarchicalBCEngine(ArrayList nodes,
ArrayList edges, int nodeWidth, int nodeHeight,
boolean edgeConcentration) {
m_nodes = nodes;
m_edges = edges;
m_nodeWidth = nodeWidth;
m_nodeHeight = nodeHeight;
makeGUIPanel(edgeConcentration);
}
/**
* SimpleConstructor If we want to instantiate the class first, and if
* information for nodes and edges is not available. However, we would have to
* manually provide all the information later on by calling setNodesEdges and
* setNodeSize methods
*/
public HierarchicalBCEngine() {
}
/**
* This methods makes the gui extra controls panel "m_controlsPanel"
*/
protected void makeGUIPanel(boolean edgeConc) {
m_jRbNaiveLayout = new JRadioButton("Naive Layout");
m_jRbPriorityLayout = new JRadioButton("Priority Layout");
ButtonGroup bg = new ButtonGroup();
bg.add(m_jRbNaiveLayout);
bg.add(m_jRbPriorityLayout);
m_jRbPriorityLayout.setSelected(true);
ActionListener a = new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
m_completeReLayout = true;
}
};
m_jRbTopdown = new JRadioButton("Top Down");
m_jRbBottomup = new JRadioButton("Bottom Up");
m_jRbTopdown.addActionListener(a);
m_jRbBottomup.addActionListener(a);
bg = new ButtonGroup();
bg.add(m_jRbTopdown);
bg.add(m_jRbBottomup);
m_jRbBottomup.setSelected(true);
m_jCbEdgeConcentration = new JCheckBox("With Edge Concentration", edgeConc);
m_jCbEdgeConcentration.setSelected(edgeConc);
m_jCbEdgeConcentration.addActionListener(a);
JPanel jp1 = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
jp1.add(m_jRbNaiveLayout, gbc);
jp1.add(m_jRbPriorityLayout, gbc);
jp1.setBorder(BorderFactory.createTitledBorder("Layout Type"));
JPanel jp2 = new JPanel(new GridBagLayout());
jp2.add(m_jRbTopdown, gbc);
jp2.add(m_jRbBottomup, gbc);
jp2.setBorder(BorderFactory.createTitledBorder("Layout Method"));
m_progress = new JProgressBar(0, 11);
m_progress.setBorderPainted(false);
m_progress.setStringPainted(true);
m_progress.setString("");
m_progress.setValue(0);
m_controlsPanel = new JPanel(new GridBagLayout());
m_controlsPanel.add(jp1, gbc);
m_controlsPanel.add(jp2, gbc);
m_controlsPanel.add(m_jCbEdgeConcentration, gbc);
}
/** give access to set of graph nodes */
@Override
public ArrayList getNodes() {
return m_nodes;
}
/**
* This method returns a handle to the extra controls panel, so that the
* visualizing class can add it to some of it's own gui panel.
*/
@Override
public JPanel getControlPanel() {
return m_controlsPanel;
}
/**
* Returns a handle to the progressBar of this LayoutEngine.
*/
@Override
public JProgressBar getProgressBar() {
return m_progress;
}
/**
* Sets the nodes and edges for this LayoutEngine. Must be used if the class
* created by simple HierarchicalBCEngine() constructor.
*
* @param nodes - FastVector containing all the nodes
* @param edges - FastVector containing all the edges
*/
@Override
public void setNodesEdges(ArrayList nodes,
ArrayList edges) {
m_nodes = nodes;
m_edges = edges;
}
/**
* Sets the size of a node. This method must be used if the class created by
* simple HierarchicalBCEngine() constructor.
*
* @param nodeWidth - A node's allowed width
* @param nodeHeight - A node's allowed height
*/
@Override
public void setNodeSize(int nodeWidth, int nodeHeight) {
m_nodeWidth = nodeWidth;
m_nodeHeight = nodeHeight;
}
/**
* Method to add a LayoutCompleteEventListener
*
* @param l - Listener to receive the LayoutCompleteEvent by this class.
*/
@Override
public void addLayoutCompleteEventListener(LayoutCompleteEventListener l) {
if (layoutCompleteListeners == null) {
layoutCompleteListeners = new ArrayList();
}
layoutCompleteListeners.add(l);
}
/**
* Method to remove a LayoutCompleteEventListener.
*
* @param e - The LayoutCompleteEventListener to remove.
*/
@Override
public void removeLayoutCompleteEventListener(LayoutCompleteEventListener e) {
if (layoutCompleteListeners != null) {
LayoutCompleteEventListener l;
for (int i = 0; i < layoutCompleteListeners.size(); i++) {
l = layoutCompleteListeners.get(i);
if (l == e) {
layoutCompleteListeners.remove(i);
return;
}
}
System.err.println("layoutCompleteListener to be remove not present");
} else {
System.err.println("layoutCompleteListener to be remove not present");
}
}
/**
* Fires a LayoutCompleteEvent.
*
* @param e - The LayoutCompleteEvent to fire
*/
@Override
public void fireLayoutCompleteEvent(LayoutCompleteEvent e) {
if (layoutCompleteListeners != null && layoutCompleteListeners.size() != 0) {
LayoutCompleteEventListener l;
for (int i = 0; i < layoutCompleteListeners.size(); i++) {
l = layoutCompleteListeners.get(i);
l.layoutCompleted(e);
}
}
}
/**
* This method does a complete layout of the graph which includes removing
* cycles, assigning levels to nodes, reducing edge crossings and laying out
* the vertices horizontally for better visibility. The removing of cycles and
* assignment of levels is only performed if hasn't been performed earlier or
* if some layout option has been changed and it is necessary to do so. It is
* necessary to do so, if the user selects/deselects edge concentration or
* topdown/bottomup options.
*
* The layout is performed in a separate thread and the progress bar of the
* class is updated for each of the steps as the process continues.
*/
@Override
public void layoutGraph() {
// cannot perform a layout if no description of nodes and/or edges is
// provided
if (m_nodes == null || m_edges == null) {
return;
}
Thread th = new Thread() {
@Override
public void run() {
m_progress.setBorderPainted(true);
if (nodeLevels == null) {
makeProperHierarchy();
} else if (m_completeReLayout == true) {
clearTemps_and_EdgesFromNodes();
makeProperHierarchy();
m_completeReLayout = false;
}
// minimizing crossings
if (m_jRbTopdown.isSelected()) {
int crossbefore = crossings(nodeLevels), crossafter = 0, i = 0;
do {
m_progress.setValue(i + 4);
m_progress.setString("Minimizing Crossings: Pass" + (i + 1));
if (i != 0) {
crossbefore = crossafter;
}
nodeLevels = minimizeCrossings(false, nodeLevels);
crossafter = crossings(nodeLevels);
i++;
} while (crossafter < crossbefore && i < 6);
} else {
int crossbefore = crossings(nodeLevels), crossafter = 0, i = 0;
do {
m_progress.setValue(i + 4);
m_progress.setString("Minimizing Crossings: Pass" + (i + 1));
if (i != 0) {
crossbefore = crossafter;
}
nodeLevels = minimizeCrossings(true, nodeLevels);
crossafter = crossings(nodeLevels);
i++;
} while (crossafter < crossbefore && i < 6);
}
// System.out.println("\nCrossings at the end "+
// crossings(nodeLevels)+
// "\n---------------------------------");
m_progress.setValue(10);
m_progress.setString("Laying out vertices");
// Laying out graph
if (m_jRbNaiveLayout.isSelected()) {
naiveLayout();
} else {
priorityLayout1();
}
m_progress.setValue(11);
m_progress.setString("Layout Complete");
m_progress.repaint();
fireLayoutCompleteEvent(new LayoutCompleteEvent(this));
m_progress.setValue(0);
m_progress.setString("");
m_progress.setBorderPainted(false);
}
};
th.start();
}
/**
* This method removes the temporary nodes that were added to fill in the
* gaps, and removes all edges from all nodes in their edges[][] array
*/
protected void clearTemps_and_EdgesFromNodes() {
/*
* System.out.println("Before............."); for(int i=0; i nodesLevel[j]) {
min = nodesLevel[j];
}
}
}
// if the shallowest child of a parent has a depth greater than 1
// and it is not a lone parent with no children
if (min != 65536 && min > 1) {
nodesLevel[i] = min - 1;
}
}
}
// System.out.println("");
int maxLevel = 0;
for (int element : nodesLevel) {
if (element > maxLevel) {
maxLevel = element;
// System.out.println( ((GraphNode)m_nodes.get(i)).ID+" "+i+">"+
// nodesLevel[i]);
}
}
int levelCounts[] = new int[maxLevel + 1];
for (int i = 0; i < nodesLevel.length; i++) {
levelCounts[nodesLevel[i]]++;
}
// System.out.println("------------------------------------------");
// ****Assigning nodes to each level
int levelsCounter[] = new int[maxLevel + 1];
nodeLevels = new int[maxLevel + 1][];
for (int i = 0; i < nodesLevel.length; i++) {
if (nodeLevels[nodesLevel[i]] == null) {
nodeLevels[nodesLevel[i]] = new int[levelCounts[nodesLevel[i]]];
}
// nodeLevels[nodesLevel[i]].addElement(new Integer(i));
// System.out.println(((GraphNode)m_nodes.get(i)).ID+" "+
// nodesLevel[i]+">"+levelCounts[nodesLevel[i]]);
nodeLevels[nodesLevel[i]][levelsCounter[nodesLevel[i]]++] = i;
}
m_progress.setValue(3);
m_progress.setString("Removing gaps by adding dummy vertices");
// *Making a proper Hierarchy by putting in dummy vertices to close all gaps
if (m_jCbEdgeConcentration.isSelected()) {
removeGapsWithEdgeConcentration(nodesLevel);
} else {
removeGaps(nodesLevel);
}
// After assigning levels and adding dummy vertices
// System.out.print("\n\t");
// for(int i=0; i 0) {
if (nodesLevel[i] > nodesLevel[n] + 1) {
int tempMatrix[][] = new int[graphMatrix.length
+ (nodesLevel[i] - nodesLevel[n] - 1)][graphMatrix.length
+ (nodesLevel[i] - nodesLevel[n] - 1)];
int level = nodesLevel[n] + 1;
copyMatrix(graphMatrix, tempMatrix);
String s1 = new String("S" + tempCnt++);
m_nodes.add(new GraphNode(s1, s1, SINGULAR_DUMMY)); // true));
int temp3[] = new int[nodeLevels[level].length + 1];
// for(int j=0; j len) {
tempMatrix[k][k - 1] = -1 * tempMatrix[n][i];
}
}
// temp[lastTempNodeCreated][targetNode]=temp[origNode][targetNode]
tempMatrix[k][i] = tempMatrix[n][i];
// System.out.println("k "+((GraphNode)m_nodes.get(k)).ID+
// " i "+((GraphNode)m_nodes.get(i)).ID+
// " n "+((GraphNode)m_nodes.get(n)).ID+
// " len "+((GraphNode)m_nodes.get(len)).ID );
// temp[origNode][firstTempNodecreated] = temp[origNode][targetNode]
tempMatrix[n][len] = tempMatrix[n][i];
// temp[firstTempNodeCreated][origNode] for reverse tracing
tempMatrix[len][n] = -1 * tempMatrix[n][i];
// temp[targetNode][lastTempNodecreated] for reverse tracing
tempMatrix[i][k] = -1 * tempMatrix[n][i];
// temp[lastTempNodeCreated][secondlastNode] for reverse tracing
// but only do this if more than 1 temp nodes are created
if (k > len) {
tempMatrix[k][k - 1] = -1 * tempMatrix[n][i];
}
// temp[origNode][targetNode] = 0 unlinking as they have been
// linked by a chain of temporary nodes now.
tempMatrix[n][i] = 0;
tempMatrix[i][n] = 0;
graphMatrix = tempMatrix;
} else {
// ****Even if there is no gap just add a reference for the
// ****parent to the child for reverse tracing, useful if the
// ****there is a reversed edge from parent to child and therefore
// ****visualizer would know to highlight this edge when
// ****highlighting the child.
graphMatrix[i][n] = -1 * graphMatrix[n][i];
}
}
}
}
// Interconnection matrices at each level, 1 to n-1 after minimizing edges
// printMatrices(nodeLevels);
}
/**
* This method removes gaps from the graph. It tries to minimise the number of
* edges by concentrating multiple dummy nodes from the same parent and on the
* same vertical level into one. It takes as an argument of int[] of length
* m_nodes.size() containing the level of each node.
*/
private void removeGapsWithEdgeConcentration(int nodesLevel[]) {
final int temp = m_nodes.size(), temp2 = graphMatrix[0].length;
int tempCnt = 1;
for (int n = 0; n < temp; n++) {
for (int i = 0; i < temp2; i++) {
if (graphMatrix[n][i] > 0) {
if (nodesLevel[i] > nodesLevel[n] + 1) {
// System.out.println("Processing node "+
// ((GraphNode)m_nodes.get(n)).ID+
// " for "+((GraphNode)m_nodes.get(i)).ID);
int tempLevel = nodesLevel[n];
boolean tempNodePresent = false;
int k = temp;
int tempnode = n;
while (tempLevel < nodesLevel[i] - 1) {
tempNodePresent = false;
for (; k < graphMatrix.length; k++) {
if (graphMatrix[tempnode][k] > 0) {
// System.out.println("tempnode will be true");
tempNodePresent = true;
break;
}
}
if (tempNodePresent) {
tempnode = k;
k = k + 1;
tempLevel++;
} else {
if (tempnode != n) {
tempnode = k - 1;
}
// System.out.println("breaking from loop");
break;
}
}
if (m_nodes.get(tempnode).nodeType == SINGULAR_DUMMY) {
m_nodes.get(tempnode).nodeType = PLURAL_DUMMY;
}
if (tempNodePresent) {
// Link the last known temp node to target
graphMatrix[tempnode][i] = graphMatrix[n][i];
// System.out.println("modifying "+
// ((GraphNode)nodes.get(tempnode)).ID+
// ", "+((GraphNode)nodes.get(n)).ID);
// ///matrix[lastknowntempnode][source]=-original_val
// ///graphMatrix[tempnode][n] = -graphMatrix[n][i];
// System.out.println("modifying "+
// ((GraphNode)nodes.get(i)).ID+
// ", "+
// ((GraphNode)nodes.get(tempnode)).ID);
// and matrix[target][lastknowntempnode]=-original_val
// for reverse tracing
graphMatrix[i][tempnode] = -graphMatrix[n][i];
// unlink source from the target
graphMatrix[n][i] = 0;
graphMatrix[i][n] = 0;
continue;
}
int len = graphMatrix.length;
int tempMatrix[][] = new int[graphMatrix.length
+ (nodesLevel[i] - nodesLevel[tempnode] - 1)][graphMatrix.length
+ (nodesLevel[i] - nodesLevel[tempnode] - 1)];
int level = nodesLevel[tempnode] + 1;
copyMatrix(graphMatrix, tempMatrix);
String s1 = new String("S" + tempCnt++);
// System.out.println("Adding dummy "+s1);
m_nodes.add(new GraphNode(s1, s1, SINGULAR_DUMMY));
int temp3[] = new int[nodeLevels[level].length + 1];
System.arraycopy(nodeLevels[level], 0, temp3, 0,
nodeLevels[level].length);
temp3[temp3.length - 1] = m_nodes.size() - 1;
nodeLevels[level] = temp3;
temp3 = new int[m_nodes.size() + 1];
System.arraycopy(nodesLevel, 0, temp3, 0, nodesLevel.length);
temp3[m_nodes.size() - 1] = level;
nodesLevel = temp3;
level++;
// nodeLevels[level++].addElement(new Integer(m_nodes.size()-1));
// System.out.println("len:"+len+"("+
// ((GraphNode)m_nodes.get(len)).ID+"),"+
// nodesLevel[i]+","+nodesLevel[tempnode]);
int m;
for (m = len; m < len + nodesLevel[i] - nodesLevel[tempnode] - 1
- 1; m++) {
String s2 = new String("S" + tempCnt++);
// System.out.println("Adding dummy "+s2);
m_nodes.add(new GraphNode(s2, s2, SINGULAR_DUMMY));
temp3 = new int[nodeLevels[level].length + 1];
// for(int j=0; j len) {
// System.out.println("modifying "+
// ((GraphNode)nodes.get(m)).ID+
// ", "+((GraphNode)nodes.get(m-1)).ID);
tempMatrix[m][m - 1] = -1 * tempMatrix[n][i];
}
}
// System.out.println("m "+((GraphNode)m_nodes.get(m)).ID+
// " i "+((GraphNode)m_nodes.get(i)).ID+
// " tempnode "+((GraphNode)m_nodes.get(tempnode)).ID+
// " len "+((GraphNode)m_nodes.get(len)).ID );
// System.out.println("modifying "+
// ((GraphNode)nodes.get(m)).ID+", "+
// ((GraphNode)nodes.get(i)).ID);
// temp[lastTempNodeCreated][targetNode]=temp[origNode][targetNode]
tempMatrix[m][i] = tempMatrix[n][i];
// System.out.println("modifying "+
// ((GraphNode)nodes.get(tempnode)).ID+", "+
// ((GraphNode)nodes.get(len)).ID);
// temp[origNode][firstTempNodecreated] = temp[origNode][targetNode]
tempMatrix[tempnode][len] = tempMatrix[n][i];
// System.out.println("modifying "+
// ((GraphNode)nodes.get(len)).ID+", "+
// ((GraphNode)nodes.get(tempnode)).ID);
// temp[firstTempNodeCreated][origNode] for reverse tracing
tempMatrix[len][tempnode] = -1 * tempMatrix[n][i];
// System.out.println("modifying "+
// ((GraphNode)nodes.get(i)).ID+", "+
// ((GraphNode)nodes.get(m)).ID);
// temp[targetNode][lastTempNodecreated] for reverse tracing
tempMatrix[i][m] = -1 * tempMatrix[n][i];
if (m > len) {
// System.out.println("modifying "+
// ((GraphNode)nodes.get(m)).ID+
// ", "+((GraphNode)nodes.get(m-1)).ID);
// temp[lastTempNodeCreated][secondlastNode] for reverse tracing
// but only do this if more than 1 temp nodes are created
tempMatrix[m][m - 1] = -1 * tempMatrix[n][i];
}
// temp[origNode][targetNode] = 0 unlinking as they have been
tempMatrix[n][i] = 0;
// linked by a chain of temporary nodes now.
tempMatrix[i][n] = 0;
graphMatrix = tempMatrix;
} else {
// System.out.println("modifying "+
// ((GraphNode)nodes.get(i)).ID+", "+
// ((GraphNode)nodes.get(n)).ID);
// ****Even if there is no gap just add a reference for the
// ****parent to the child for reverse tracing, useful if the
// ****there is a reversed edge from parent to child and therefore
// ****visualizer would know to highlight this edge when
// ****highlighting the child.
graphMatrix[i][n] = -1 * graphMatrix[n][i];
}
}
}
}
}
/**
* Returns the index of an element in a level. Must never be called with the
* wrong element and the wrong level, will throw an exception otherwise. It
* takes as agrument the index of the element (in the m_nodes vector) and the
* level it is supposed to be in (as each level contains the indices of the
* nodes present in that level).
*/
private int indexOfElementInLevel(int element, int level[]) throws Exception {
for (int i = 0; i < level.length; i++) {
if (level[i] == element) {
return i;
}
}
throw new Exception("Error. Didn't find element " + m_nodes.get(element).ID
+ " in level. Inspect code for "
+ "weka.gui.graphvisualizer.HierarchicalBCEngine");
}
/**
* Computes the number of edge crossings in the whole graph Takes as an
* argument levels of nodes. It is essentially the same algorithm provided in
* Universitat des Saarlandes technical report A03/94 by Georg Sander.
*/
protected int crossings(final int levels[][]) {
int sum = 0;
for (int i = 0; i < levels.length - 1; i++) {
// System.out.println("*****************Processing level "+i+
// "*****************************");
MyList upper = new MyList(), lower = new MyList();
MyListNode lastOcrnce[] = new MyListNode[m_nodes.size()];
int edgeOcrnce[] = new int[m_nodes.size()];
for (int j = 0, uidx = 0, lidx = 0; j < (levels[i].length + levels[i + 1].length); j++) {
if ((j % 2 == 0 && uidx < levels[i].length)
|| lidx >= levels[i + 1].length) {
int k1 = 0, k2 = 0, k3 = 0;
GraphNode n = m_nodes.get(levels[i][uidx]);
// Deactivating and counting crossings for all edges ending in it
// coming from bottom left
if (lastOcrnce[levels[i][uidx]] != null) {
MyListNode temp = new MyListNode(-1);
temp.next = upper.first;
try {
do {
temp = temp.next;
if (levels[i][uidx] == temp.n) {
k1 = k1 + 1;
k3 = k3 + k2;
// System.out.println("Removing from upper: "+temp.n);
upper.remove(temp);
} else {
k2 = k2 + 1;
}
} while (temp != lastOcrnce[levels[i][uidx]]);
} catch (NullPointerException ex) {
System.out.println("levels[i][uidx]: " + levels[i][uidx]
+ " which is: " + m_nodes.get(levels[i][uidx]).ID + " temp: "
+ temp + " upper.first: " + upper.first);
ex.printStackTrace();
System.exit(-1);
}
lastOcrnce[levels[i][uidx]] = null;
sum = sum + k1 * lower.size() + k3;
}
// Activating all the edges going out towards the bottom
// and bottom right
for (int k = 0; k < n.edges.length; k++) {
if (n.edges[k][1] > 0) {
try {
if (indexOfElementInLevel(n.edges[k][0], levels[i + 1]) >= uidx) {
edgeOcrnce[n.edges[k][0]] = 1;
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
for (int k = 0; k < levels[i + 1].length; k++) {
if (edgeOcrnce[levels[i + 1][k]] == 1) {
MyListNode temp = new MyListNode(levels[i + 1][k]); // new
// MyListNode(n.edges[k][0]);
lower.add(temp);
lastOcrnce[levels[i + 1][k]] = temp;
edgeOcrnce[levels[i + 1][k]] = 0;
// System.out.println("Adding to lower: "+levels[i+1][k]+
// " which is: "+((GraphNode)m_nodes.get(levels[i+1][k])).ID+
// " first's n is: "+lower.first.n);
}
}
uidx++;
} else {
int k1 = 0, k2 = 0, k3 = 0;
GraphNode n = m_nodes.get(levels[i + 1][lidx]);
// Deactivating and counting crossings for all edges ending in it
// coming from up and upper left
if (lastOcrnce[levels[i + 1][lidx]] != null) {
MyListNode temp = new MyListNode(-1);
temp.next = lower.first;
try {
do {
temp = temp.next;
if (levels[i + 1][lidx] == temp.n) {
k1 = k1 + 1;
k3 = k3 + k2;
lower.remove(temp);
// System.out.println("Removing from lower: "+temp.n);
} else {
k2 = k2 + 1;
// System.out.println("temp: "+temp+" lastOcrnce: "+
// lastOcrnce[levels[i+1][lidx]]+" temp.n: "+
// temp.n+" lastOcrnce.n: "+
// lastOcrnce[levels[i+1][lidx]].n);
}
} while (temp != lastOcrnce[levels[i + 1][lidx]]);
} catch (NullPointerException ex) {
System.out.print("levels[i+1][lidx]: " + levels[i + 1][lidx]
+ " which is: " + m_nodes.get(levels[i + 1][lidx]).ID
+ " temp: " + temp);
System.out.println(" lower.first: " + lower.first);
ex.printStackTrace();
System.exit(-1);
}
lastOcrnce[levels[i + 1][lidx]] = null;
sum = sum + k1 * upper.size() + k3;
}
// Activating all the edges going out towards the upper right
for (int k = 0; k < n.edges.length; k++) {
if (n.edges[k][1] < 0) {
try {
if (indexOfElementInLevel(n.edges[k][0], levels[i]) > lidx) {
edgeOcrnce[n.edges[k][0]] = 1;
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
for (int k = 0; k < levels[i].length; k++) {
if (edgeOcrnce[levels[i][k]] == 1) {
MyListNode temp = new MyListNode(levels[i][k]);
upper.add(temp);
lastOcrnce[levels[i][k]] = temp;
edgeOcrnce[levels[i][k]] = 0;
// System.out.println("Adding to upper: "+levels[i][k]+
// " which is : "+
// ((GraphNode)m_nodes.get(levels[i][k])).ID+
// " from node: "+n.ID+", "+k+
// " first's value: "+upper.first.n);
}
}
lidx++;
}
}
// System.out.println("Sum at the end is: "+sum);
}
return sum;
}
/**
* The following two methods remove cycles from the graph.
*/
protected void removeCycles() {
// visited[x]=1 is only visited AND visited[x]=2 means node is visited
// and is on the current path
int visited[] = new int[m_nodes.size()];
for (int i = 0; i < graphMatrix.length; i++) {
if (visited[i] == 0) {
removeCycles2(i, visited);
visited[i] = 1;
}
}
}
/**
* This method should not be called directly. It should be called only from to
* call removeCycles()
*/
private void removeCycles2(int nindex, int visited[]) {
visited[nindex] = 2;
for (int i = 0; i < graphMatrix[nindex].length; i++) {
if (graphMatrix[nindex][i] == DIRECTED) {
if (visited[i] == 0) {
removeCycles2(i, visited);
visited[i] = 1;
} else if (visited[i] == 2) {
if (nindex == i) {
graphMatrix[nindex][i] = 0;
} else if (graphMatrix[i][nindex] == DIRECTED) {
// System.out.println("\nFound double "+nindex+','+i);
graphMatrix[i][nindex] = DOUBLE;
graphMatrix[nindex][i] = -DOUBLE;
} else {
// System.out.println("\nReversing "+nindex+','+i);
graphMatrix[i][nindex] = REVERSED;
graphMatrix[nindex][i] = -REVERSED;
}
}
}
}
}
/**
* This method assigns a vertical level to each node. See
* makeProperHierarchy() to see how to use it.
*/
protected void assignLevels(int levels[], int depth, int i, int j) {
// System.out.println(i+","+j);
if (i >= graphMatrix.length) {
return;
} else if (j >= graphMatrix[i].length) {
return;
}
if (graphMatrix[i][j] <= 0) {
assignLevels(levels, depth, i, ++j);
} else if (graphMatrix[i][j] == DIRECTED || graphMatrix[i][j] == DOUBLE) {
if (depth + 1 > levels[j]) {
levels[j] = depth + 1;
assignLevels(levels, depth + 1, j, 0);
}
assignLevels(levels, depth, i, ++j);
}
}
/**
* This method minimizes the number of edge crossings using the BaryCenter
* heuristics given by Sugiyama et al. 1981 This method processes the graph
* topdown if reversed is false, otherwise it does bottomup.
*/
private int[][] minimizeCrossings(boolean reversed, int nodeLevels[][]) {
// Minimizing crossings using Sugiyama's method
if (reversed == false) {
for (int times = 0; times < 1; times++) {
int tempLevels[][] = new int[nodeLevels.length][];
// System.out.println("---------------------------------");
// System.out.println("Crossings before PHaseID: "+
// crossings(nodeLevels));
copy2DArray(nodeLevels, tempLevels);
for (int i = 0; i < nodeLevels.length - 1; i++) {
phaseID(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
}
// System.out.println("\nCrossings before PHaseIU: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = nodeLevels.length - 2; i >= 0; i--) {
phaseIU(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
}
// System.out.println("\nCrossings before PHaseIID: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = 0; i < nodeLevels.length - 1; i++) { // Down
phaseIID(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// System.out.println("Crossings temp:"+crossings(tempLevels)+
// " graph:"+crossings(nodeLevels));
// printMatrices(nodeLevels);
}
// System.out.println("\nCrossings before PHaseIIU: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = nodeLevels.length - 2; i >= 0; i--) { // Up
phaseIIU(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// /System.out.println("Crossings temp:"+crossings(tempLevels)+
// " graph:"+crossings(nodeLevels));
// /printMatrices(nodeLevels);
// System.out.println("\nCrossings after phaseIIU: "+
// crossings(nodeLevels));
}
}
return nodeLevels;
} else {
for (int times = 0; times < 1; times++) {
int tempLevels[][] = new int[nodeLevels.length][];
// System.out.println("---------------------------------");
// System.out.println("\nCrossings before PHaseIU: "+
// crossings(nodeLevels));
copy2DArray(nodeLevels, tempLevels);
for (int i = nodeLevels.length - 2; i >= 0; i--) {
phaseIU(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// printMatrices(nodeLevels);
}
// System.out.println("Crossings before PHaseID: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = 0; i < nodeLevels.length - 1; i++) {
phaseID(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// /printMatrices(nodeLevels);
}
// System.out.println("\nCrossings before PHaseIIU: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = nodeLevels.length - 2; i >= 0; i--) { // Up
phaseIIU(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// printMatrices(nodeLevels);
}
// System.out.println("\nCrossings before PHaseIID: "+
// crossings(nodeLevels));
tempLevels = new int[nodeLevels.length][];
copy2DArray(nodeLevels, tempLevels);
for (int i = 0; i < nodeLevels.length - 1; i++) { // Down
phaseIID(i, tempLevels);
}
if (crossings(tempLevels) < crossings(nodeLevels)) {
nodeLevels = tempLevels;
// /printMatrices(nodeLevels);
// System.out.println("\nCrossings after phaseIID: "+
// crossings(nodeLevels));
}
}
return nodeLevels;
}
}
/**
* See Sugiyama et al. 1981 (full reference give at top) lindex is the index
* of the level we want to process. In this method we'll sort the vertices at
* the level one below lindex according to their UP-barycenters (or column
* barycenters).
*/
protected void phaseID(final int lindex, final int levels[][]) {
float colBC[]; // = new float[levels[lindex+1].size()];
colBC = calcColBC(lindex, levels);
// System.out.println("In ID Level"+(lindex+1)+":");
// System.out.print("\t");
// for(int i=0; i= 0; k--) {
phaseIU(k, levels);
}
// System.out.println("Crossings temp:"+crossings(tempLevels)+
// " graph:"+crossings(levels));
// if(crossings(tempLevels)= 0; k--) {
phaseIU(k, levels);
}
if (crossings(levels) <= crossings(tempLevels)) {
// System.out.println("Crossings temp: "+crossings(tempLevels)+
// " Crossings levels: "+crossings(levels));
copy2DArray(levels, tempLevels);
} // printMatrices(levels);
else {
copy2DArray(tempLevels, levels);
levels[lindex][i + 1] = node1;
levels[lindex][i] = node2;
}
// System.out.println("Crossings after PhaseIU of PhaseIIU, in "+
// "iteration "+i+" of "+(rowBC.length-1)+" at "
// +lindex+", levels: "+crossings(levels)+
// " temp: "+crossings(tempLevels));
// tempLevels = new int[levels.length][];
// copy2DArray(levels, tempLevels);
for (int k = 0; k < levels.length - 1; k++) {
phaseID(k, levels);
}
// if(crossings(tempLevels) 0) {
sum++;
try {
rowBC[i] = rowBC[i]
+ indexOfElementInLevel(edge[0], levels[lindex + 1]) + 1;
} catch (Exception ex) {
return null;
}
}
}
if (rowBC[i] != 0) {
rowBC[i] = rowBC[i] / sum;
}
}
return rowBC;
}
/**
* See Sugiyama et al. 1981 (full reference give at top)
*/
protected float[] calcColBC(final int lindex, final int levels[][]) {
float colBC[] = new float[levels[lindex + 1].length];
GraphNode n;
for (int i = 0; i < levels[lindex + 1].length; i++) {
int sum = 0;
n = m_nodes.get(levels[lindex + 1][i]);
for (int[] edge : n.edges) {
if (edge[1] < 1) {
sum++;
try {
colBC[i] = colBC[i]
+ indexOfElementInLevel(edge[0], levels[lindex]) + 1;
} catch (Exception ex) {
return null;
}
}
}
if (colBC[i] != 0) {
colBC[i] = colBC[i] / sum;
}
}
return colBC;
}
/**
* Prints out the interconnection matrix at each level. See Sugiyama et al.
* 1981 (full reference give at top)
*/
protected void printMatrices(final int levels[][]) {
int i = 0;
for (i = 0; i < levels.length - 1; i++) {
float rowBC[] = null;
float colBC[] = null;
try {
rowBC = calcRowBC(i, levels);
colBC = calcColBC(i, levels);
} catch (NullPointerException ne) {
System.out.println("i: " + i + " levels.length: " + levels.length);
ne.printStackTrace();
return;
}
System.out.print("\nM" + (i + 1) + "\t");
for (int j = 0; j < levels[i + 1].length; j++) {
System.out.print(m_nodes.get(levels[i + 1][j]).ID + " ");
// ((Integer)levels[i+1].get(j)).intValue())+" ");
}
System.out.println("");
for (int j = 0; j < levels[i].length; j++) {
System.out.print(m_nodes.get(levels[i][j]).ID + "\t");
// ((Integer)levels[i].get(j)).intValue())+"\t");
for (int k = 0; k < levels[i + 1].length; k++) {
System.out.print(graphMatrix[levels[i][j]]
// ((Integer)levels[i].get(j)).intValue()]
[levels[i + 1][k]]
+ " ");
// ((Integer)levels[i+1].get(k)).intValue()]+" ");
}
System.out.println(rowBC[j]);
}
System.out.print("\t");
for (int k = 0; k < levels[i + 1].length; k++) {
System.out.print(colBC[k] + " ");
}
}
System.out.println("\nAt the end i: " + i + " levels.length: "
+ levels.length);
}
/**
* This methods sorts the vertices in level[] according to their barycenters
* in BC[], using combsort11. It, however, doesn't touch the vertices with
* barycenter equal to zero.
*/
/*
* //This method should be removed protected static void combSort11(int
* level[], float BC[]) { int switches, j, top, gap, lhold; float hold; gap =
* BC.length; do { gap=(int)(gap/1.3); switch(gap) { case 0: gap = 1; break;
* case 9: case 10: gap=11; break; default: break; } switches=0; top =
* BC.length-gap; for(int i=0; i BC[j]) { hold=BC[i]; BC[i]=BC[j]; BC[j]=hold; lhold =
* level[i]; level[i] = level[j]; level[j] = lhold; switches++; }//endif
* }//endfor }while(switches>0 || gap>1); }
*/
/**
* This methods sorts the vertices in level[] according to their barycenters
* in BC[], using insertion sort. It, however, doesn't touch the vertices with
* barycenter equal to zero.
*/
// Both level and BC have elements in the same order
protected static void isort(int level[], float BC[]) {
float temp;
int temp2;
for (int i = 0; i < BC.length - 1; i++) {
int j = i;
temp = BC[j + 1];
temp2 = level[j + 1];
if (temp == 0) {
continue;
}
int prej = j + 1;
while (j > -1 && (temp < BC[j] || BC[j] == 0)) {
if (BC[j] == 0) {
j--;
continue;
} else {
BC[prej] = BC[j];
level[prej] = level[j];
prej = j;
j--;
}
}
// j++;
BC[prej] = temp;
level[prej] = temp2;
// Integer node = (Integer)level.get(i+1);
// level.remove(i+1);
// level.insertElementAt(node, prej);
}
}
/**
* Copies one Matrix of type int[][] to another.
*/
protected void copyMatrix(int from[][], int to[][]) {
for (int i = 0; i < from.length; i++) {
for (int j = 0; j < from[i].length; j++) {
to[i][j] = from[i][j];
}
}
}
/**
* Copies one array of type int[][] to another.
*/
protected void copy2DArray(int from[][], int to[][]) {
for (int i = 0; i < from.length; i++) {
to[i] = new int[from[i].length];
System.arraycopy(from[i], 0, to[i], 0, from[i].length);
// for(int j=0; jmaxStringWidth) maxStringWidth=strWidth; }
*
* if(m_nodeSize 0) {
n++;
}
}
return n;
}
protected int lConnectivity(int lindex, int eindex) {
int n = 0;
for (int i = 0; i < nodeLevels[lindex + 1].length; i++) {
if (graphMatrix[nodeLevels[lindex][eindex]][nodeLevels[lindex + 1][i]] > 0) {
n++;
}
}
return n;
}
protected int uBCenter(int lindex, int eindex, int horPositions[]) {
int sum = 0;
for (int i = 0; i < nodeLevels[lindex - 1].length; i++) {
if (graphMatrix[nodeLevels[lindex - 1][i]][nodeLevels[lindex][eindex]] > 0) {
sum = sum + (horPositions[nodeLevels[lindex - 1][i]]);
}
}
if (sum != 0) { // To avoid 0/0
// System.out.println("uBC Result: "+sum+"/"+
// uConnectivity(lindex,eindex)+
// " = "+(sum/uConnectivity(lindex,eindex)) );
sum = sum / uConnectivity(lindex, eindex);
}
return sum;
}
protected int lBCenter(int lindex, int eindex, int horPositions[]) {
int sum = 0;
for (int i = 0; i < nodeLevels[lindex + 1].length; i++) {
if (graphMatrix[nodeLevels[lindex][eindex]][nodeLevels[lindex + 1][i]] > 0) {
sum = sum + (horPositions[nodeLevels[lindex + 1][i]]);
}
}
if (sum != 0) {
sum = sum / lConnectivity(lindex, eindex); // lConectivity;
}
return sum;
}
/**
* This method lays out the vertices horizontally, in each level. See Sugiyama
* et al. 1981 for full reference.
*/
protected void priorityLayout1() {
int[] horPositions = new int[m_nodes.size()];
int maxCount = 0;
for (int i = 0; i < nodeLevels.length; i++) {
int count = 0;
for (int j = 0; j < nodeLevels[i].length; j++) {
horPositions[nodeLevels[i][j]] = j;
count++;
}
if (count > maxCount) {
maxCount = count;
}
}
// fireLayoutCompleteEvent( new LayoutCompleteEvent(this) );
int priorities[], BC[];
// System.out.println("********Going from 2 to n********");
for (int i = 1; i < nodeLevels.length; i++) {
priorities = new int[nodeLevels[i].length];
BC = new int[nodeLevels[i].length];
for (int j = 0; j < nodeLevels[i].length; j++) {
if (m_nodes.get(nodeLevels[i][j]).ID.startsWith("S")) {
priorities[j] = maxCount + 1;
} else {
priorities[j] = uConnectivity(i, j);
}
BC[j] = uBCenter(i, j, horPositions);
}
// for(int j=0; j= 0; i--) {
priorities = new int[nodeLevels[i].length];
BC = new int[nodeLevels[i].length];
for (int j = 0; j < nodeLevels[i].length; j++) {
if (m_nodes.get(nodeLevels[i][j]).ID.startsWith("S")) {
priorities[j] = maxCount + 1;
} else {
priorities[j] = lConnectivity(i, j);
}
BC[j] = lBCenter(i, j, horPositions); // , priorities[j]);
}
priorityLayout2(nodeLevels[i], priorities, BC, horPositions);
// repaint();
// try {
// tempMethod(horPositions);
// fireLayoutCompleteEvent( new LayoutCompleteEvent(this) );
// Thread.sleep(1000);
// } catch(InterruptedException ie) { ie.printStackTrace(); }
// for(int j=0; j"+horPositions[i]);
}
}
// int nodeHeight = m_nodeHeight*2; //m_fm.getHeight()*2;
for (int i = 0, temp = 0; i < nodeLevels.length; i++) {
for (int j = 0; j < nodeLevels[i].length; j++) {
temp = nodeLevels[i][j];
// horPositions[temp]=j;
GraphNode n = m_nodes.get(temp);
n.x = horPositions[temp] * m_nodeWidth;
n.y = i * 3 * m_nodeHeight;
}
}
// setAppropriateSize();
}
/**
* This method is used by priorityLayout1(). It should not be called directly.
* This method does the actual moving of the vertices in each level based on
* their priorities and barycenters.
*/
private void priorityLayout2(int level[], int priorities[], int bCenters[],
int horPositions[]) {
int descOrder[] = new int[priorities.length];
// Getting the indices of priorities in descending order
descOrder[0] = 0;
for (int i = 0; i < priorities.length - 1; i++) {
int j = i;
int temp = i + 1;
while (j > -1 && priorities[descOrder[j]] < priorities[temp]) {
descOrder[j + 1] = descOrder[j];
j--;
}
j++;
descOrder[j] = temp;
}
// System.out.println("\nPriorities:");
// for(int i=0; i horPositions[level[j]]) {
leftCount++;
} else if (horPositions[level[descOrder[i]]] < horPositions[level[j]]) {
rightCount++;
}
}
leftNodes = new int[leftCount];
rightNodes = new int[rightCount];
for (int j = 0, l = 0, r = 0; j < priorities.length; j++) {
if (horPositions[level[descOrder[i]]] > horPositions[level[j]]) {
leftNodes[l++] = j;
} else if (horPositions[level[descOrder[i]]] < horPositions[level[j]]) {
rightNodes[r++] = j;
}
}
// ****Moving left
while (Math.abs(horPositions[level[descOrder[i]]] - 1
- bCenters[descOrder[i]]) < Math
.abs(horPositions[level[descOrder[i]]] - bCenters[descOrder[i]])) {
// ****Checking if it can be moved to left
int temp = horPositions[level[descOrder[i]]];
boolean cantMove = false;
for (int j = leftNodes.length - 1; j >= 0; j--) {
if (temp - horPositions[level[leftNodes[j]]] > 1) {
break;
} else if (priorities[descOrder[i]] <= priorities[leftNodes[j]]) {
cantMove = true;
break;
} else {
temp = horPositions[level[leftNodes[j]]];
}
}
// if(horPositions[level[descOrder[i]]]-1==
// horPositions[level[leftNodes[j]]])
// cantMove = true;
if (cantMove) {
break;
}
temp = horPositions[level[descOrder[i]]] - 1;
// ****moving other vertices to left
for (int j = leftNodes.length - 1; j >= 0; j--) {
if (temp == horPositions[level[leftNodes[j]]]) {
// System.out.println("Moving "+
// ((Node)m_nodes.get(level[leftNodes[j]])).ID+" from "
// +horPositions[level[leftNodes[j]]]+" to "
// +(horPositions[level[leftNodes[j]]]-1) );
horPositions[level[leftNodes[j]]] = temp = horPositions[level[leftNodes[j]]] - 1;
}
}
// System.out.println("Moving main "+
// ((GraphNode)m_nodes.get(level[descOrder[i]])).ID+" from "
// +horPositions[level[descOrder[i]]]+" to "
// +(horPositions[level[descOrder[i]]]-1));
horPositions[level[descOrder[i]]] = horPositions[level[descOrder[i]]] - 1;
}
// ****Moving right
while (Math.abs(horPositions[level[descOrder[i]]] + 1
- bCenters[descOrder[i]]) < Math
.abs(horPositions[level[descOrder[i]]] - bCenters[descOrder[i]])) {
// ****checking if the vertex can be moved
int temp = horPositions[level[descOrder[i]]];
boolean cantMove = false;
for (int rightNode : rightNodes) {
if (horPositions[level[rightNode]] - temp > 1) {
break;
} else if (priorities[descOrder[i]] <= priorities[rightNode]) {
cantMove = true;
break;
} else {
temp = horPositions[level[rightNode]];
}
}
// if(horPositions[level[descOrder[i]]]-1==
// horPositions[level[leftNodes[j]]])
// cantMove = true;
if (cantMove) {
break;
}
temp = horPositions[level[descOrder[i]]] + 1;
// ****moving other vertices to left
for (int j = 0; j < rightNodes.length; j++) {
if (temp == horPositions[level[rightNodes[j]]]) {
// System.out.println("Moving "+
// (Node)m_nodes.get(level[rightNodes[j]])).ID+" from "
// +horPositions[level[rightNodes[j]]]+" to "
// +(horPositions[level[rightNodes[j]]]+1) );
horPositions[level[rightNodes[j]]] = temp = horPositions[level[rightNodes[j]]] + 1;
}
}
// System.out.println("Moving main "+
// ((GraphNode)m_nodes.get(level[descOrder[i]])).ID+" from "
// +horPositions[level[descOrder[i]]]+" to "
// +(horPositions[level[descOrder[i]]]+1));
horPositions[level[descOrder[i]]] = horPositions[level[descOrder[i]]] + 1;
}
}
}
}
/**
* The following classes implement a double linked list to be used in the
* crossings function.
*/
private class MyList {
int size;
MyListNode first = null;
MyListNode last = null;
public void add(MyListNode n) {
if (first == null) {
first = last = n;
} else if (last.next == null) {
last.next = n;
last.next.previous = last;
last = last.next;
} else {
System.err.println("Error shouldn't be in here. Check MyList code");
size--;
}
size++;
}
public void remove(MyListNode n) {
if (n.previous != null) {
n.previous.next = n.next;
}
if (n.next != null) {
n.next.previous = n.previous;
}
if (last == n) {
last = n.previous;
}
if (first == n) {
first = n.next;
}
size--;
}
public int size() {
return size;
}
}
private class MyListNode {
int n;
MyListNode next, previous;
public MyListNode(int i) {
n = i;
next = null;
previous = null;
}
}
} // HierarchicalBCEngine