Get Area or Elements in zoomed Scatterplot

Question

I've got the following problem. I want to zoom-in a Scatterplot and then select all the displayed elements.

It would be sufficient to somehow get the displayed area in the zoomed-in Scatterplot. From the range of this area i could determine which elements are displayed in the area and which are not.

\edit: Found the Solution (Implementing AxisChangeListener Interface)

import java.awt.Color;
import java.awt.Dimension;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.event.AxisChangeListener;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.chart.ChartFactory;  
import org.jfree.chart.JFreeChart; 


public class ScatterExample extends ApplicationFrame implements AxisChangeListener {
/**
 * Creates a new demo instance.
 * @param title the frame title. 
 */

private XYSeriesCollection dataset;
private JFreeChart chart;


public ScatterExample(String title) { 
    super(title);

    dataset = createSampleXYDataset();

    chart = ChartFactory.createScatterPlot(
            "Scatterplot Demo", // chart title
            "X", // domain axis label
            "Y", // range axis label
            dataset,  // data
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips? 
            false // URLs?

    ); 
    //customize chart
    chart.setBackgroundPaint(Color.white); 
    XYPlot plot = chart.getXYPlot(); 
    plot.setBackgroundPaint(Color.lightGray); 
    plot.setRangeGridlinePaint(Color.white);

    plot.getRangeAxis().setRange(0.0, 10.0);
    plot.getRangeAxis().addChangeListener(this);
    plot.getDomainAxis().setRange(0.0, 10.0);
    plot.getDomainAxis().addChangeListener(this);

    ChartPanel chartPanel = new ChartPanel(chart, false); 
    chartPanel.setPreferredSize(new Dimension(500, 500)); 
    setContentPane(chartPanel); 
}

private XYSeriesCollection createSampleXYDataset() {
    XYSeriesCollection d = new XYSeriesCollection();
    XYSeries ser = new XYSeries("Series 1");
    XYSeries ser2 = new XYSeries("Series 2");

    ser.add(1.0,2.0);
    ser.add(2.0,2.0);
    ser2.add(3.0,2.0);
    ser.add(3.0,3.0);
    ser2.add(2.0,5.0);
    ser.add(1.0,2.0);
    ser.add(3.0,7.0);
    ser2.add(4.0,4.0);

    d.addSeries(ser);
    d.addSeries(ser2);

    return d;
}

/**
 * Starting point for the demonstration application. 
 * @param args ignored. 
 */

public static void main(String[] args) {
    ScatterExample demo = new ScatterExample("Scatterplot Demo"); 
    demo.pack(); 
    RefineryUtilities.centerFrameOnScreen(demo); 
    demo.setVisible(true);
}

@Override
public void axisChanged(AxisChangeEvent event) {
    if (event.getAxis().equals(chart.getXYPlot().getRangeAxis())){
        double rangeLow = chart.getXYPlot().getRangeAxis().getLowerBound();
        double rangeUp = chart.getXYPlot().getRangeAxis().getUpperBound();

        System.out.println("RangeAxis new range from "+rangeLow+" to "+rangeUp);
    }
    else {
        if (event.getAxis().equals(chart.getXYPlot().getDomainAxis())){
            double domainLow = chart.getXYPlot().getDomainAxis().getLowerBound();
            double domainUp = chart.getXYPlot().getDomainAxis().getUpperBound();

            System.out.println("DomainAxis new range from "+domainLow+" to "+domainUp);
        }
    }   
}
}

Answer 1

The poster found a solution to this by having the ScatterExample class implement the AxisChangeListener interface. The example has been updated to version 1.5. It also adds a table to display the history of the axis bound changes. The image shows the result of zooming, panning and clicking the zoom command buttons, Zoom In to Reset Y.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Rectangle;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JToolBar;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.event.AxisChangeListener;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.chart.ChartFactory;
import static org.jfree.chart.ChartPanel.*;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.Axis;
import org.jfree.chart.axis.ValueAxis;

public final class ScatterExample implements AxisChangeListener {

    private static final int N = 32; // data points per series
    private static final int R = 10; // initial axis bounds
    private final Random RANDOM = new Random();
    private ChartPanel chartPanel = new ChartPanel(null, false) {
        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 400);
        }
    };
    private final DefaultTableModel model = new DefaultTableModel(
        new String[]{"Axis", "lower bound", "upper bound"}, 0) {
        @Override
        public boolean isCellEditable(int row, int column) {
            return false;
        }
    };
    private final JTable table = new JTable(model) {

        @Override
        public Class<?> getColumnClass(int column) {
            switch (column) {
                case 0:
                    return String.class;
                case 1:
                    return Double.class;
                case 2:
                    return Double.class;
                default:
                    return String.class;
            }
        }

        @Override
        public Dimension getPreferredScrollableViewportSize() {
            return new Dimension(250, 400);
        }
    };

    public static void main(String[] args) {
        EventQueue.invokeLater(new ScatterExample()::display);
    }

    private void display() {
        XYSeriesCollection dataset = createSampleXYDataset();
        JFreeChart chart = ChartFactory.createScatterPlot(
            "Scatterplot", // chart title
            "X", // domain axis label
            "Y", // range axis label
            dataset, // data
            PlotOrientation.VERTICAL, // orientation
            true, // include legend?
            true, // tooltips? 
            false // URLs?
        );
        XYPlot plot = chart.getXYPlot();
        plot.setDomainPannable(true);
        plot.getDomainAxis().setRange(-R, R);
        plot.getDomainAxis().addChangeListener(this);
        plot.setRangePannable(true);
        plot.getRangeAxis().setRange(-R, R);
        plot.getRangeAxis().addChangeListener(this);

        chartPanel.setChart(chart);
        table.setDefaultRenderer(Double.class, new DefaultTableCellRenderer() {
            {
                setHorizontalAlignment(JLabel.RIGHT);
            }
            NumberFormat f = new DecimalFormat("#.00");

            @Override
            protected void setValue(Object value) {
                setText((value == null) ? "" : f.format(value));
            }
        });

        JFrame f = new JFrame("Axis Range Example");
        f.add(chartPanel);
        f.add(createControls(), BorderLayout.SOUTH);
        f.add(new JScrollPane(table), BorderLayout.EAST);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private XYSeriesCollection createSampleXYDataset() {
        XYSeriesCollection d = new XYSeriesCollection();
        XYSeries series1 = new XYSeries("Series 1");
        XYSeries series2 = new XYSeries("Series 2");
        for (int i = 0; i < N; i++) {
            series1.add(RANDOM.nextGaussian(), RANDOM.nextGaussian());
            series2.add(RANDOM.nextGaussian(), RANDOM.nextGaussian());
        }
        d.addSeries(series1);
        d.addSeries(series2);
        return d;
    }

    @Override
    public void axisChanged(AxisChangeEvent event) {
        Axis changed = event.getAxis();
        ValueAxis domainAxis = chartPanel.getChart().getXYPlot().getDomainAxis();
        ValueAxis rangeAxis = chartPanel.getChart().getXYPlot().getRangeAxis();
        if (changed.equals(domainAxis)) {
            double lower = domainAxis.getLowerBound();
            double upper = domainAxis.getUpperBound();
            model.addRow(new Object[]{"Domain", lower, upper});
        }
        if (changed.equals(rangeAxis)) {
            double lower = rangeAxis.getLowerBound();
            double upper = rangeAxis.getUpperBound();
            model.addRow(new Object[]{"Range", lower, upper});
        }
        int last = table.getModel().getRowCount() - 1;
        Rectangle r = table.getCellRect(last, 0, true);
        table.scrollRectToVisible(r);
    }

    // @see https://stackoverflow.com/a/41544007/230513
    private JPanel createControls() {
        JPanel panel = new JPanel();
        JToolBar toolBar = new JToolBar();
        toolBar.add(createButton("Zoom In", ZOOM_IN_BOTH_COMMAND));
        toolBar.add(createButton("Zoom In X", ZOOM_IN_DOMAIN_COMMAND));
        toolBar.add(createButton("Zoom In Y", ZOOM_IN_RANGE_COMMAND));
        toolBar.add(createButton("Zoom Out", ZOOM_OUT_BOTH_COMMAND));
        toolBar.add(createButton("Zoom Out X", ZOOM_OUT_DOMAIN_COMMAND));
        toolBar.add(createButton("Zoom Out Y", ZOOM_OUT_RANGE_COMMAND));
        toolBar.add(createButton("Reset", ZOOM_RESET_BOTH_COMMAND));
        toolBar.add(createButton("Reset X", ZOOM_RESET_DOMAIN_COMMAND));
        toolBar.add(createButton("Reset Y", ZOOM_RESET_RANGE_COMMAND));
        panel.add(toolBar);
        return panel;
    }

    private JButton createButton(String name, String command) {
        final JButton b = new JButton(name);
        b.setActionCommand(command);
        b.addActionListener(chartPanel);
        return b;
    }
}