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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
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/*
 *   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 .
 */

/*
 *    MatrixPanel.java
 *    Copyright (C) 2002-2012 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.visualize;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Random;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.JSplitPane;
import javax.swing.JTextField;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import weka.core.Attribute;
import weka.core.Instances;
import weka.gui.ExtensionFileFilter;

/**
 * This panel displays a plot matrix of the user selected attributes of a given
 * data set.
 * 
 * The datapoints are coloured using a discrete colouring set if the user has
 * selected a nominal attribute for colouring. If the user has selected a
 * numeric attribute then the datapoints are coloured using a colour spectrum
 * ranging from blue to red (low values to high). Datapoints missing a class
 * value are displayed in black.
 * 
 * @author Ashraf M. Kibriya ([email protected])
 * @version $Revision: 10222 $
 */
public class MatrixPanel extends JPanel {

  /** for serialization */
  private static final long serialVersionUID = -1232642719869188740L;

  /** The that panel contains the actual matrix */
  private final Plot m_plotsPanel;

  /** The panel that displays the legend of the colouring attribute */
  protected final ClassPanel m_cp = new ClassPanel();

  /**
   * The panel that contains all the buttons and tools, i.e. resize, jitter bars
   * and sub-sampling buttons etc on the bottom of the panel
   */
  protected JPanel optionsPanel;

  /** Split pane for splitting the matrix and the buttons and bars */
  protected JSplitPane jp;
  /**
   * The button that updates the display to reflect the changes made by the
   * user. E.g. changed attribute set for the matrix
   */
  protected JButton m_updateBt = new JButton("Update");

  /** The button to display a window to select attributes */
  protected JButton m_selAttrib = new JButton("Select Attributes");

  /** The dataset for which this panel will display the plot matrix for */
  protected Instances m_data = null;

  /** The list for selecting the attributes to display the plot matrix */
  protected JList m_attribList = new JList();

  /** The scroll pane to scrolling the matrix */
  protected final JScrollPane m_js = new JScrollPane();

  /** The combo box to allow user to select the colouring attribute */
  protected JComboBox m_classAttrib = new JComboBox();

  /** The slider to adjust the size of the cells in the matrix */
  protected JSlider m_plotSize = new JSlider(50, 200, 100);

  /** The slider to adjust the size of the datapoints */
  protected JSlider m_pointSize = new JSlider(1, 10, 1);

  /** The slider to add jitter to the plots */
  protected JSlider m_jitter = new JSlider(0, 20, 0);

  /** For adding random jitter */
  private final Random rnd = new Random();

  /** Array containing precalculated jitter values */
  private int jitterVals[][];

  /** This stores the size of the datapoint */
  private int datapointSize = 1;

  /** The text area for percentage to resample data */
  protected JTextField m_resamplePercent = new JTextField(5);

  /** The label for resample percentage */
  protected JButton m_resampleBt = new JButton("SubSample % :");

  /** Random seed for random subsample */
  protected JTextField m_rseed = new JTextField(5);

  /** Displays the current size beside the slider bar for cell size */
  private final JLabel m_plotSizeLb = new JLabel("PlotSize: [100]");

  /** Displays the current size beside the slider bar for point size */
  private final JLabel m_pointSizeLb = new JLabel("PointSize: [10]");

  /** This array contains the indices of the attributes currently selected */
  private int[] m_selectedAttribs;

  /** This contains the index of the currently selected colouring attribute */
  private int m_classIndex;

  /**
   * This is a local array cache for all the instance values for faster
   * rendering
   */
  private int[][] m_points;

  /**
   * This is an array cache for the colour of each of the instances depending on
   * the colouring attribute. If the colouring attribute is nominal then it
   * contains the index of the colour in our colour list. Otherwise, for numeric
   * colouring attribute, it contains the precalculated red component for each
   * instance's colour
   */
  private int[] m_pointColors;

  /**
   * Contains true for each attribute value (only the selected attributes+class
   * attribute) that is missing, for each instance. m_missing[i][j] == true if
   * m_selectedAttribs[j] is missing in instance i.
   * m_missing[i][m_missing[].length-1] == true if class value is missing in
   * instance i.
   */
  private boolean[][] m_missing;

  /**
   * This array contains for the classAttribute: 

   * m_type[0] = [type of attribute, nominal, string or numeric]

   * m_type[1] = [number of discrete values of nominal or string attribute 

   * or same as m_type[0] for numeric attribute]
   */
  private int[] m_type;

  /** Stores the maximum size for PlotSize label to keep it's size constant */
  private final Dimension m_plotLBSizeD;

  /** Stores the maximum size for PointSize label to keep it's size constant */
  private final Dimension m_pointLBSizeD;

  /** Contains discrete colours for colouring for nominal attributes */
  private final ArrayList m_colorList = new ArrayList();

  /** default colour list */
  private static final Color[] m_defaultColors = { Color.blue, Color.red,
    Color.cyan, new Color(75, 123, 130), Color.pink, Color.green, Color.orange,
    new Color(255, 0, 255), new Color(255, 0, 0), new Color(0, 255, 0),
    Color.black };

  /** color for the font used in column and row names */
  private final Color fontColor = new Color(98, 101, 156);

  /** font used in column and row names */
  private final java.awt.Font f = new java.awt.Font("Dialog",
    java.awt.Font.BOLD, 11);

  protected transient Image m_osi = null;
  protected boolean[][] m_plottedCells;
  protected boolean m_regenerateOSI = true;
  protected boolean m_clearOSIPlottedCells;
  protected double m_previousPercent = -1;

  protected JCheckBox m_fastScroll = new JCheckBox(
    "Fast scrolling (uses more memory)");

  /**
   * Constructor
   */
  public MatrixPanel() {
    m_rseed.setText("1");

    /** Setting up GUI **/
    m_selAttrib.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent ae) {
        final JDialog jd = new JDialog((JFrame) MatrixPanel.this
          .getTopLevelAncestor(), "Attribute Selection Panel",
          ModalityType.DOCUMENT_MODAL);

        JPanel jp = new JPanel();
        JScrollPane js = new JScrollPane(m_attribList);
        JButton okBt = new JButton("OK");
        JButton cancelBt = new JButton("Cancel");
        final int[] savedSelection = m_attribList.getSelectedIndices();

        okBt.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
            jd.dispose();
          }
        });

        cancelBt.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
            m_attribList.setSelectedIndices(savedSelection);
            jd.dispose();
          }
        });
        jd.addWindowListener(new WindowAdapter() {
          @Override
          public void windowClosing(WindowEvent e) {
            m_attribList.setSelectedIndices(savedSelection);
            jd.dispose();
          }
        });
        jp.add(okBt);
        jp.add(cancelBt);

        jd.getContentPane().add(js, BorderLayout.CENTER);
        jd.getContentPane().add(jp, BorderLayout.SOUTH);

        if (js.getPreferredSize().width < 200) {
          jd.setSize(250, 250);
        } else {
          jd.setSize(js.getPreferredSize().width + 10, 250);
        }

        jd.setLocation(m_selAttrib.getLocationOnScreen().x,
          m_selAttrib.getLocationOnScreen().y - jd.getHeight());
        jd.setVisible(true);
      }
    });

    m_updateBt.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        // m_selectedAttribs = m_attribList.getSelectedIndices();
        initInternalFields();

        Plot a = m_plotsPanel;
        a.setCellSize(m_plotSize.getValue());
        Dimension d = new Dimension((m_selectedAttribs.length)
          * (a.cellSize + a.extpad) + 2, (m_selectedAttribs.length)
          * (a.cellSize + a.extpad) + 2);
        // System.out.println("Size: "+a.cellSize+" Extpad: "+
        // a.extpad+" selected: "+
        // m_selectedAttribs.length+' '+d);
        a.setPreferredSize(d);
        a.setSize(a.getPreferredSize());
        a.setJitter(m_jitter.getValue());

        if (m_fastScroll.isSelected() && m_clearOSIPlottedCells) {
          m_plottedCells = new boolean[m_selectedAttribs.length][m_selectedAttribs.length];
          m_clearOSIPlottedCells = false;
        }

        if (m_regenerateOSI) {
          m_osi = null;
        }
        m_js.revalidate();
        m_cp.setColours(m_colorList);
        m_cp.setCindex(m_classIndex);
        m_regenerateOSI = false;

        repaint();
      }
    });
    m_updateBt.setPreferredSize(m_selAttrib.getPreferredSize());

    m_jitter.addChangeListener(new ChangeListener() {
      @Override
      public void stateChanged(ChangeEvent ce) {
        if (m_fastScroll.isSelected()) {
          m_clearOSIPlottedCells = true;
        }
      }
    });

    m_plotSize.addChangeListener(new ChangeListener() {
      @Override
      public void stateChanged(ChangeEvent ce) {
        m_plotSizeLb.setText("PlotSize: [" + m_plotSize.getValue() + "]");
        m_plotSizeLb.setPreferredSize(m_plotLBSizeD);
        m_jitter.setMaximum(m_plotSize.getValue() / 5); // 20% of cell Size
        m_regenerateOSI = true;
      }
    });

    m_pointSize.addChangeListener(new ChangeListener() {
      @Override
      public void stateChanged(ChangeEvent ce) {
        m_pointSizeLb.setText("PointSize: [" + m_pointSize.getValue() + "]");
        m_pointSizeLb.setPreferredSize(m_pointLBSizeD);
        datapointSize = m_pointSize.getValue();
        if (m_fastScroll.isSelected()) {
          m_clearOSIPlottedCells = true;
        }
      }
    });

    m_resampleBt.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        JLabel rseedLb = new JLabel("Random Seed: ");
        JTextField rseedTxt = m_rseed;
        JLabel percentLb = new JLabel("Subsample as");
        JLabel percent2Lb = new JLabel("% of input: ");
        final JTextField percentTxt = new JTextField(5);
        percentTxt.setText(m_resamplePercent.getText());
        JButton doneBt = new JButton("Done");

        final JDialog jd = new JDialog((JFrame) MatrixPanel.this
          .getTopLevelAncestor(), "Subsample % Panel",
          ModalityType.DOCUMENT_MODAL) {
          private static final long serialVersionUID = -269823533147146296L;

          @Override
          public void dispose() {
            m_resamplePercent.setText(percentTxt.getText());
            super.dispose();
          }
        };
        jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

        doneBt.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent ae) {
            jd.dispose();
          }
        });
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        JPanel p1 = new JPanel(gbl);
        gbc.anchor = GridBagConstraints.WEST;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.insets = new Insets(0, 2, 2, 2);
        gbc.gridwidth = GridBagConstraints.RELATIVE;
        p1.add(rseedLb, gbc);
        gbc.weightx = 0;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.weightx = 1;
        p1.add(rseedTxt, gbc);
        gbc.insets = new Insets(8, 2, 0, 2);
        gbc.weightx = 0;
        p1.add(percentLb, gbc);
        gbc.insets = new Insets(0, 2, 2, 2);
        gbc.gridwidth = GridBagConstraints.RELATIVE;
        p1.add(percent2Lb, gbc);
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.weightx = 1;
        p1.add(percentTxt, gbc);
        gbc.insets = new Insets(8, 2, 2, 2);

        JPanel p3 = new JPanel(gbl);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.weightx = 1;
        gbc.weighty = 0;
        p3.add(p1, gbc);
        gbc.insets = new Insets(8, 4, 8, 4);
        p3.add(doneBt, gbc);

        jd.getContentPane().setLayout(new BorderLayout());
        jd.getContentPane().add(p3, BorderLayout.NORTH);
        jd.pack();
        jd.setLocation(m_resampleBt.getLocationOnScreen().x,
          m_resampleBt.getLocationOnScreen().y - jd.getHeight());
        jd.setVisible(true);
      }
    });

    optionsPanel = new JPanel(new GridBagLayout()); // all the rest of the
                                                    // panels are in here.
    final JPanel p2 = new JPanel(new BorderLayout()); // this has class colour
                                                      // panel
    final JPanel p3 = new JPanel(new GridBagLayout()); // this has update and
                                                       // select buttons
    final JPanel p4 = new JPanel(new GridBagLayout()); // this has the slider
                                                       // bars and combobox
    GridBagConstraints gbc = new GridBagConstraints();

    m_plotLBSizeD = m_plotSizeLb.getPreferredSize();
    m_pointLBSizeD = m_pointSizeLb.getPreferredSize();
    m_pointSizeLb.setText("PointSize: [1]");
    m_pointSizeLb.setPreferredSize(m_pointLBSizeD);
    m_resampleBt.setPreferredSize(m_selAttrib.getPreferredSize());

    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.anchor = GridBagConstraints.NORTHWEST;
    gbc.insets = new Insets(2, 2, 2, 2);
    p4.add(m_plotSizeLb, gbc);
    gbc.weightx = 1;
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    p4.add(m_plotSize, gbc);
    gbc.weightx = 0;
    gbc.gridwidth = GridBagConstraints.RELATIVE;
    p4.add(m_pointSizeLb, gbc);
    gbc.weightx = 1;
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    p4.add(m_pointSize, gbc);
    gbc.weightx = 0;
    gbc.gridwidth = GridBagConstraints.RELATIVE;
    p4.add(new JLabel("Jitter: "), gbc);
    gbc.weightx = 1;
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    p4.add(m_jitter, gbc);
    p4.add(m_classAttrib, gbc);

    gbc.gridwidth = GridBagConstraints.REMAINDER;
    gbc.weightx = 1;
    gbc.fill = GridBagConstraints.NONE;
    p3.add(m_fastScroll, gbc);
    p3.add(m_updateBt, gbc);
    p3.add(m_selAttrib, gbc);
    gbc.gridwidth = GridBagConstraints.RELATIVE;
    gbc.weightx = 0;
    gbc.fill = GridBagConstraints.VERTICAL;
    gbc.anchor = GridBagConstraints.WEST;
    p3.add(m_resampleBt, gbc);
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    p3.add(m_resamplePercent, gbc);

    p2.setBorder(BorderFactory.createTitledBorder("Class Colour"));
    p2.add(m_cp, BorderLayout.SOUTH);

    gbc.insets = new Insets(8, 5, 2, 5);
    gbc.anchor = GridBagConstraints.SOUTHWEST;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.weightx = 1;
    gbc.gridwidth = GridBagConstraints.RELATIVE;
    optionsPanel.add(p4, gbc);
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    optionsPanel.add(p3, gbc);
    optionsPanel.add(p2, gbc);

    m_fastScroll.setSelected(false);
    m_fastScroll.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        if (!m_fastScroll.isSelected()) {
          m_osi = null;
        } else {
          m_plottedCells = new boolean[m_selectedAttribs.length][m_selectedAttribs.length];
        }
        MatrixPanel.this.invalidate();
        MatrixPanel.this.repaint();
      }
    });

    this.addComponentListener(new ComponentAdapter() {
      @Override
      public void componentResized(ComponentEvent cv) {
        m_js.setMinimumSize(new Dimension(MatrixPanel.this.getWidth(),
          MatrixPanel.this.getHeight() - optionsPanel.getPreferredSize().height
            - 10));
        jp.setDividerLocation(MatrixPanel.this.getHeight()
          - optionsPanel.getPreferredSize().height - 10);
      }
    });

    optionsPanel.setMinimumSize(new Dimension(0, 0));
    jp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, m_js, optionsPanel);
    jp.setOneTouchExpandable(true);
    jp.setResizeWeight(1);
    this.setLayout(new BorderLayout());
    this.add(jp, BorderLayout.CENTER);

    /** Setting up the initial color list **/
    for (int i = 0; i < m_defaultColors.length - 1; i++) {
      m_colorList.add(m_defaultColors[i]);
    }

    /** Initializing internal fields and components **/
    m_selectedAttribs = m_attribList.getSelectedIndices();
    m_plotsPanel = new Plot();
    m_plotsPanel.setLayout(null);
    m_js.getHorizontalScrollBar().setUnitIncrement(10);
    m_js.getVerticalScrollBar().setUnitIncrement(10);
    m_js.setViewportView(m_plotsPanel);
    m_js.setColumnHeaderView(m_plotsPanel.getColHeader());
    m_js.setRowHeaderView(m_plotsPanel.getRowHeader());
    final JLabel lb = new JLabel(" Plot Matrix");
    lb.setFont(f);
    lb.setForeground(fontColor);
    lb.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
    m_js.setCorner(JScrollPane.UPPER_LEFT_CORNER, lb);
    m_cp.setInstances(m_data);
    m_cp.setBorder(BorderFactory.createEmptyBorder(15, 10, 10, 10));
    m_cp.addRepaintNotify(m_plotsPanel);
    // m_updateBt.doClick(); //not until setting up the instances
  }

  /**
   * Initializes internal data fields, i.e. data values, type, missing and color
   * cache arrays
   */
  public void initInternalFields() {
    Instances inst = m_data;
    m_classIndex = m_classAttrib.getSelectedIndex();
    m_selectedAttribs = m_attribList.getSelectedIndices();
    double minC = 0, maxC = 0;

    /** Resampling **/
    double currentPercent = Double.parseDouble(m_resamplePercent.getText());
    if (currentPercent <= 100) {
      if (currentPercent != m_previousPercent) {
        m_clearOSIPlottedCells = true;
      }
      inst = new Instances(m_data, 0, m_data.numInstances());
      inst.randomize(new Random(Integer.parseInt(m_rseed.getText())));

      // System.err.println("gettingPercent: " +
      // Math.round(
      // Double.parseDouble(m_resamplePercent.getText())
      // / 100D * m_data.numInstances()
      // )
      // );

      inst = new Instances(inst, 0, (int) Math.round(currentPercent / 100D
        * inst.numInstances()));
      m_previousPercent = currentPercent;
    }
    m_points = new int[inst.numInstances()][m_selectedAttribs.length]; // changed
    m_pointColors = new int[inst.numInstances()];
    m_missing = new boolean[inst.numInstances()][m_selectedAttribs.length + 1]; // changed
    m_type = new int[2]; // [m_selectedAttribs.length]; //changed
    jitterVals = new int[inst.numInstances()][2];

    /**
     * Setting up the color list for non-numeric attribute as well as jittervals
     **/
    if (!(inst.attribute(m_classIndex).isNumeric())) {

      for (int i = m_colorList.size(); i < inst.attribute(m_classIndex)
        .numValues() + 1; i++) {
        Color pc = m_defaultColors[i % 10];
        int ija = i / 10;
        ija *= 2;
        for (int j = 0; j < ija; j++) {
          pc = pc.darker();
        }
        m_colorList.add(pc);
      }

      for (int i = 0; i < inst.numInstances(); i++) {
        // set to black for missing class value which is last colour is default
        // list
        if (inst.instance(i).isMissing(m_classIndex)) {
          m_pointColors[i] = m_defaultColors.length - 1;
        } else {
          m_pointColors[i] = (int) inst.instance(i).value(m_classIndex);
        }

        jitterVals[i][0] = rnd.nextInt(m_jitter.getValue() + 1)
          - m_jitter.getValue() / 2;
        jitterVals[i][1] = rnd.nextInt(m_jitter.getValue() + 1)
          - m_jitter.getValue() / 2;

      }
    }
    /** Setting up color variations for numeric attribute as well as jittervals **/
    else {
      for (int i = 0; i < inst.numInstances(); i++) {
        if (!(inst.instance(i).isMissing(m_classIndex))) {
          minC = maxC = inst.instance(i).value(m_classIndex);
          break;
        }
      }

      for (int i = 1; i < inst.numInstances(); i++) {
        if (!(inst.instance(i).isMissing(m_classIndex))) {
          if (minC > inst.instance(i).value(m_classIndex)) {
            minC = inst.instance(i).value(m_classIndex);
          }
          if (maxC < inst.instance(i).value(m_classIndex)) {
            maxC = inst.instance(i).value(m_classIndex);
          }
        }
      }

      for (int i = 0; i < inst.numInstances(); i++) {
        double r = (inst.instance(i).value(m_classIndex) - minC)
          / (maxC - minC);
        r = (r * 240) + 15;
        m_pointColors[i] = (int) r;

        jitterVals[i][0] = rnd.nextInt(m_jitter.getValue() + 1)
          - m_jitter.getValue() / 2;
        jitterVals[i][1] = rnd.nextInt(m_jitter.getValue() + 1)
          - m_jitter.getValue() / 2;
      }
    }

    /** Creating local cache of the data values **/
    double min[] = new double[m_selectedAttribs.length], max = 0; // changed
    double ratio[] = new double[m_selectedAttribs.length]; // changed
    double cellSize = m_plotSize.getValue(), temp1 = 0, temp2 = 0;

    for (int j = 0; j < m_selectedAttribs.length; j++) {
      int i;
      for (i = 0; i < inst.numInstances(); i++) {
        min[j] = max = 0;
        if (!(inst.instance(i).isMissing(m_selectedAttribs[j]))) {
          min[j] = max = inst.instance(i).value(m_selectedAttribs[j]);
          break;
        }
      }
      for (; i < inst.numInstances(); i++) {
        if (!(inst.instance(i).isMissing(m_selectedAttribs[j]))) {
          if (inst.instance(i).value(m_selectedAttribs[j]) < min[j]) {
            min[j] = inst.instance(i).value(m_selectedAttribs[j]);
          }
          if (inst.instance(i).value(m_selectedAttribs[j]) > max) {
            max = inst.instance(i).value(m_selectedAttribs[j]);
          }
        }
      }
      ratio[j] = cellSize / (max - min[j]);
    }

    boolean classIndexProcessed = false;
    for (int j = 0; j < m_selectedAttribs.length; j++) {
      if (inst.attribute(m_selectedAttribs[j]).isNominal()
        || inst.attribute(m_selectedAttribs[j]).isString()) {
        // m_type[0][j] = 1; m_type[1][j] =
        // inst.attribute(m_selectedAttribs[j]).numValues();

        temp1 = cellSize / inst.attribute(m_selectedAttribs[j]).numValues(); // m_type[1][j];
        temp2 = temp1 / 2;
        for (int i = 0; i < inst.numInstances(); i++) {
          m_points[i][j] = (int) Math.round(temp2 + temp1
            * inst.instance(i).value(m_selectedAttribs[j]));
          if (inst.instance(i).isMissing(m_selectedAttribs[j])) {
            m_missing[i][j] = true; // represents missing value
            if (m_selectedAttribs[j] == m_classIndex) {
              m_missing[i][m_missing[0].length - 1] = true;
              classIndexProcessed = true;
            }
          }
        }
      } else {
        // m_type[0][j] = m_type[1][j] = 0;
        for (int i = 0; i < inst.numInstances(); i++) {
          m_points[i][j] = (int) Math.round((inst.instance(i).value(
            m_selectedAttribs[j]) - min[j])
            * ratio[j]);
          if (inst.instance(i).isMissing(m_selectedAttribs[j])) {
            m_missing[i][j] = true; // represents missing value
            if (m_selectedAttribs[j] == m_classIndex) {
              m_missing[i][m_missing[0].length - 1] = true;
              classIndexProcessed = true;
            }
          }
        }
      }
    }

    if (inst.attribute(m_classIndex).isNominal()
      || inst.attribute(m_classIndex).isString()) {
      m_type[0] = 1;
      m_type[1] = inst.attribute(m_classIndex).numValues();
    } else {
      m_type[0] = m_type[1] = 0;
    }

    if (classIndexProcessed == false) { // class Index has not been processed as
                                        // class index is not among the selected
                                        // attribs
      for (int i = 0; i < inst.numInstances(); i++) {
        if (inst.instance(i).isMissing(m_classIndex)) {
          m_missing[i][m_missing[0].length - 1] = true;
        }
      }
    }

    m_cp.setColours(m_colorList);
  }

  /**
   * Sets up the UI's attributes lists
   */
  public void setupAttribLists() {
    String[] tempAttribNames = new String[m_data.numAttributes()];
    String type;

    m_classAttrib.removeAllItems();
    for (int i = 0; i < tempAttribNames.length; i++) {
      type = " (" + Attribute.typeToStringShort(m_data.attribute(i)) + ")";
      tempAttribNames[i] = new String("Colour: " + m_data.attribute(i).name()
        + " " + type);
      m_classAttrib.addItem(tempAttribNames[i]);
    }
    if (m_data.classIndex() == -1) {
      m_classAttrib.setSelectedIndex(tempAttribNames.length - 1);
    } else {
      m_classAttrib.setSelectedIndex(m_data.classIndex());
    }
    m_attribList.setListData(tempAttribNames);
    m_attribList.setSelectionInterval(0, tempAttribNames.length - 1);
  }

  /**
   * Calculates the percentage to resample
   */
  public void setPercent() {
    if (m_data.numInstances() > 700) {
      double percnt = 500D / m_data.numInstances() * 100;
      percnt *= 100;
      percnt = Math.round(percnt);
      percnt /= 100;

      m_resamplePercent.setText("" + percnt);
    } else {
      m_resamplePercent.setText("100");
    }
  }

  /**
   * This method changes the Instances object of this class to a new one. It
   * also does all the necessary initializations for displaying the panel. This
   * must be called before trying to display the panel.
   * 
   * @param newInst The new set of Instances
   */
  public void setInstances(Instances newInst) {

    m_osi = null;
    m_fastScroll.setSelected(false);
    m_data = newInst;
    setPercent();
    setupAttribLists();
    m_rseed.setText("1");
    initInternalFields();
    m_cp.setInstances(m_data);
    m_cp.setCindex(m_classIndex);
    m_updateBt.doClick();
  }

  /**
   * Main method for testing this class
   */
  public static void main(String[] args) {
    final JFrame jf = new JFrame("Weka Explorer: MatrixPanel");
    final JButton setBt = new JButton("Set Instances");
    Instances data = null;
    try {
      if (args.length == 1) {
        data = new Instances(new BufferedReader(new FileReader(args[0])));
      } else {
        System.out.println("Usage: MatrixPanel ");
        System.exit(-1);
      }
    } catch (IOException ex) {
      ex.printStackTrace();
      System.exit(-1);
    }

    final MatrixPanel mp = new MatrixPanel();
    mp.setInstances(data);
    setBt.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        JFileChooser chooser = new JFileChooser(new java.io.File(System
          .getProperty("user.dir")));
        ExtensionFileFilter myfilter = new ExtensionFileFilter("arff",
          "Arff data files");
        chooser.setFileFilter(myfilter);
        int returnVal = chooser.showOpenDialog(jf);

        if (returnVal == JFileChooser.APPROVE_OPTION) {
          try {
            System.out.println("You chose to open this file: "
              + chooser.getSelectedFile().getName());
            Instances in = new Instances(new FileReader(chooser
              .getSelectedFile().getAbsolutePath()));
            mp.setInstances(in);
          } catch (Exception ex) {
            ex.printStackTrace();
          }
        }
      }
    });
    // System.out.println("Loaded: "+args[0]+"\nRelation: "+data.relationName()+"\nAttributes: "+data.numAttributes());
    // System.out.println("The attributes are: ");
    // for(int i=0; i r.x + r.width) {
              break;
            } else {
              attribWidth = fm.stringWidth(m_data.attribute(m_selectedAttrib)
                .name());
              g.drawString(
                m_data.attribute(m_selectedAttrib).name(),
                (attribWidth < cellSize) ? (xpos + (cellSize / 2 - attribWidth / 2))
                  : xpos, ypos);
            }
            xpos += cellSize + extpad;
          }
          fm = null;
          r = null;
        }

        @Override
        public Dimension getPreferredSize() {
          fm = this.getFontMetrics(this.getFont());
          return new Dimension(m_selectedAttribs.length * (cellSize + extpad),
            2 * extpad + fm.getHeight());
        }
      };

      jPlRowHeader = new JPanel() {
        private static final long serialVersionUID = 8474957069309552844L;

        java.awt.Rectangle r;

        @Override
        public void paint(Graphics g) {
          r = g.getClipBounds();
          g.setColor(this.getBackground());
          g.fillRect(r.x, r.y, r.width, r.height);
          g.setFont(f);
          fm = g.getFontMetrics();
          int xpos = 0, ypos = 0;

          g.setColor(fontColor);
          xpos = extpad;
          ypos = extpad;

          for (int j = m_selectedAttribs.length - 1; j >= 0; j--) {
            if (ypos + cellSize < r.y) {
              ypos += cellSize + extpad;
              continue;
            } else if (ypos > r.y + r.height) {
              break;
            } else {
              g.drawString(m_data.attribute(m_selectedAttribs[j]).name(), xpos
                + extpad, ypos + cellSize / 2);
            }
            xpos = extpad;
            ypos += cellSize + extpad;
          }
          r = null;
        }

        @Override
        public Dimension getPreferredSize() {
          return new Dimension(100 + extpad, m_selectedAttribs.length
            * (cellSize + extpad));
        }
      };
      jPlColHeader.setFont(f);
      jPlRowHeader.setFont(f);
      this.setFont(f);
    }

    public JPanel getRowHeader() {
      return jPlRowHeader;
    }

    public JPanel getColHeader() {
      return jPlColHeader;
    }

    @Override
    public void mouseMoved(MouseEvent e) {
      Graphics g = this.getGraphics();
      int xpos = extpad, ypos = extpad;

      for (int j = m_selectedAttribs.length - 1; j >= 0; j--) {
        for (@SuppressWarnings("unused")
        int m_selectedAttrib : m_selectedAttribs) {
          if (e.getX() >= xpos && e.getX() <= xpos + cellSize + extpad) {
            if (e.getY() >= ypos && e.getY() <= ypos + cellSize + extpad) {
              if (xpos != lastxpos || ypos != lastypos) {
                g.setColor(Color.red);
                g.drawRect(xpos - 1, ypos - 1, cellSize + 1, cellSize + 1);
                if (lastxpos != 0 && lastypos != 0) {
                  g.setColor(this.getBackground().darker());
                  g.drawRect(lastxpos - 1, lastypos - 1, cellSize + 1,
                    cellSize + 1);
                }
                lastxpos = xpos;
                lastypos = ypos;
              }
              return;
            }
          }
          xpos += cellSize + extpad;
        }
        xpos = extpad;
        ypos += cellSize + extpad;
      }
      if (lastxpos != 0 && lastypos != 0) {
        g.setColor(this.getBackground().darker());
        g.drawRect(lastxpos - 1, lastypos - 1, cellSize + 1, cellSize + 1);
      }
      lastxpos = lastypos = 0;
    }

    @Override
    public void mouseDragged(MouseEvent e) {
    }

    @Override
    public void mouseClicked(MouseEvent e) {
      int i = 0, j = 0, found = 0;

      int xpos = extpad, ypos = extpad;
      for (j = m_selectedAttribs.length - 1; j >= 0; j--) {
        for (i = 0; i < m_selectedAttribs.length; i++) {
          if (e.getX() >= xpos && e.getX() <= xpos + cellSize + extpad) {
            if (e.getY() >= ypos && e.getY() <= ypos + cellSize + extpad) {
              found = 1;
              break;
            }
          }
          xpos += cellSize + extpad;
        }
        if (found == 1) {
          break;
        }
        xpos = extpad;
        ypos += cellSize + extpad;
      }
      if (found == 0) {
        return;
      }

      JFrame jf = new JFrame("Weka Explorer: Visualizing "
        + m_data.relationName());
      VisualizePanel vp = new VisualizePanel();
      try {
        PlotData2D pd = new PlotData2D(m_data);
        pd.setPlotName("Master Plot");
        vp.setMasterPlot(pd);
        // System.out.println("x: "+i+" y: "+j);
        vp.setXIndex(m_selectedAttribs[i]);
        vp.setYIndex(m_selectedAttribs[j]);
        vp.m_ColourCombo.setSelectedIndex(m_classIndex);
      } catch (Exception ex) {
        ex.printStackTrace();
      }
      jf.getContentPane().add(vp);
      jf.setSize(800, 600);
      jf.setVisible(true);
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }

    /**
     * sets the new jitter value for the plots
     */
    public void setJitter(int newjitter) {
    }

    /**
     * sets the new size for the plots
     */
    public void setCellSize(int newCellSize) {
      cellSize = newCellSize;
      initialize();
    }

    /**
     * Returns the X and Y attributes of the plot the mouse is currently on
     */
    @Override
    public String getToolTipText(MouseEvent event) {
      int xpos = extpad, ypos = extpad;

      for (int j = m_selectedAttribs.length - 1; j >= 0; j--) {
        for (int m_selectedAttrib : m_selectedAttribs) {
          if (event.getX() >= xpos && event.getX() <= xpos + cellSize + extpad) {
            if (event.getY() >= ypos
              && event.getY() <= ypos + cellSize + extpad) {
              return ("X: " + m_data.attribute(m_selectedAttrib).name()
                + " Y: " + m_data.attribute(m_selectedAttribs[j]).name() + " (click to enlarge)");
            }
          }
          xpos += cellSize + extpad;
        }
        xpos = extpad;
        ypos += cellSize + extpad;
      }
      return ("Matrix Panel");
    }

    /**
     * Paints a single Plot at xpos, ypos. and xattrib and yattrib on X and Y
     * axes
     */
    public void paintGraph(Graphics g, int xattrib, int yattrib, int xpos,
      int ypos) {
      int x, y;
      g.setColor(this.getBackground().darker().darker());
      g.drawRect(xpos - 1, ypos - 1, cellSize + 1, cellSize + 1);
      g.setColor(Color.white);
      g.fillRect(xpos, ypos, cellSize, cellSize);
      for (int i = 0; i < m_points.length; i++) {

        if (!(m_missing[i][yattrib] || m_missing[i][xattrib])) {

          if (m_type[0] == 0) {
            if (m_missing[i][m_missing[0].length - 1]) {
              g.setColor(m_defaultColors[m_defaultColors.length - 1]);
            } else {
              g.setColor(new Color(m_pointColors[i], 150,
                (255 - m_pointColors[i])));
            }
          } else {
            g.setColor(m_colorList.get(m_pointColors[i]));
          }

          if (m_points[i][xattrib] + jitterVals[i][0] < 0
            || m_points[i][xattrib] + jitterVals[i][0] > cellRange) {
            if (cellRange - m_points[i][yattrib] + jitterVals[i][1] < 0
              || cellRange - m_points[i][yattrib] + jitterVals[i][1] > cellRange) {
              // both x and y out of range don't add jitter
              x = intpad + m_points[i][xattrib];
              y = intpad + (cellRange - m_points[i][yattrib]);
            } else {
              // only x out of range
              x = intpad + m_points[i][xattrib];
              y = intpad + (cellRange - m_points[i][yattrib])
                + jitterVals[i][1];
            }
          } else if (cellRange - m_points[i][yattrib] + jitterVals[i][1] < 0
            || cellRange - m_points[i][yattrib] + jitterVals[i][1] > cellRange) {
            // only y out of range
            x = intpad + m_points[i][xattrib] + jitterVals[i][0];
            y = intpad + (cellRange - m_points[i][yattrib]);
          } else {
            // none out of range
            x = intpad + m_points[i][xattrib] + jitterVals[i][0];
            y = intpad + (cellRange - m_points[i][yattrib]) + jitterVals[i][1];
          }
          if (datapointSize == 1) {
            g.drawLine(x + xpos, y + ypos, x + xpos, y + ypos);
          } else {
            g.drawOval(x + xpos - datapointSize / 2, y + ypos - datapointSize
              / 2, datapointSize, datapointSize);
          }
        }
      }
      g.setColor(fontColor);
    }

    private void createOSI() {
      int iwidth = this.getWidth();
      int iheight = this.getHeight();
      m_osi = this.createImage(iwidth, iheight);
      clearOSI();
    }

    private void clearOSI() {
      if (m_osi == null) {
        return;
      }

      int iwidth = this.getWidth();
      int iheight = this.getHeight();
      Graphics m = m_osi.getGraphics();
      m.setColor(this.getBackground().darker().darker());
      m.fillRect(0, 0, iwidth, iheight);
    }

    /**
     * Paints the matrix of plots in the current visible region
     */
    public void paintME(Graphics g) {
      Graphics g2 = g;
      if (m_osi == null && m_fastScroll.isSelected()) {
        createOSI();
      }
      if (m_osi != null && m_fastScroll.isSelected()) {
        g2 = m_osi.getGraphics();
      }
      r = g.getClipBounds();

      g.setColor(this.getBackground());
      g.fillRect(r.x, r.y, r.width, r.height);
      g.setColor(fontColor);

      int xpos = 0, ypos = 0;

      xpos = extpad;
      ypos = extpad;

      for (int j = m_selectedAttribs.length - 1; j >= 0; j--) {
        if (ypos + cellSize < r.y) {
          ypos += cellSize + extpad;
          continue;
        } else if (ypos > r.y + r.height) {
          break;
        } else {
          for (int i = 0; i < m_selectedAttribs.length; i++) {
            if (xpos + cellSize < r.x) {
              xpos += cellSize + extpad;
              continue;
            } else if (xpos > r.x + r.width) {
              break;
            } else if (m_fastScroll.isSelected()) {
              if (!m_plottedCells[i][j]) {
                paintGraph(g2, i, j, xpos, ypos); // m_selectedAttribs[i],
                                                  // m_selectedAttribs[j], xpos,
                                                  // ypos);
                m_plottedCells[i][j] = true;
              }
            } else {
              paintGraph(g2, i, j, xpos, ypos);
            }
            xpos += cellSize + extpad;
          }
        }
        xpos = extpad;
        ypos += cellSize + extpad;
      }
    }

    /**
     * paints this JPanel (PlotsPanel)
     */
    @Override
    public void paintComponent(Graphics g) {
      paintME(g);
      if (m_osi != null && m_fastScroll.isSelected()) {
        g.drawImage(m_osi, 0, 0, this);
      }
    }
  }
}