moving the whole chart to right/left, up/down

[hotwingz]

Hello,
I'm using XYSeriesCollection to graph a number of peaks. Each peak is composed of one XYSeries. The XYDataset is used to construct a single chart which is then used to construct a ChartPanel. All standard so far.

What I'd like to do is the follows:
When the right arrow is pressed, I'd like the whole chart to move towards the right. The ValueAxis has to remain the same, but the chart has to move.

I tried iterating through the XYSeriesCollection and the XYSeries adding a number to the actual X values and then repainting the ChartPanel. But, some peaks(XYSeries) move while others stay where they are. I'd expected them all to move lockstep.

Any ideas would be appreciated

[david.gilbert]

You could write a dataset class that 'wraps' any XYDataset and applies a translation to all the x-values returned by that dataset. Saves having to update all the x-values...

[hotwingz]

Thanks,David.

But, errrrr, I looked at a couple of examples in the forum but those had to do with translating from Java2D to axis coordinates. Could give me a further pointer?

Much appreciated.

hotwingz

[david.gilbert]

This is an example of what I had in mind:

Code: Select all

/* -------------------
 * TranslateDemo1.java
 * -------------------
 * (C) Copyright 2006, by Object Refinery Limited.
 *
 */


import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.border.Border;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.time.Minute;
import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.AbstractXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;

/**
 * A wrapper dataset that provides a translation of the underlying dataset.
 */
public class TranslateDemo extends ApplicationFrame {

    private static class DemoPanel extends JPanel 
                                   implements ChangeListener {
    
        private TimeSeries series;
        
        private ChartPanel chartPanel;
        
        private JFreeChart chart;
        
        private JSlider slider;
        
        private TranslatingXYDataset dataset;

        static class TranslatingXYDataset extends AbstractXYDataset 
                implements XYDataset, DatasetChangeListener {
            private XYDataset underlying;
            private double translate;
            public TranslatingXYDataset(XYDataset underlying) {
                this.underlying = underlying;
                this.underlying.addChangeListener(this);
                this.translate = 0.0;
            }
            public double getTranslate() {
                return this.translate;
            }
            public void setTranslate(double t) {
                this.translate = t;
                this.fireDatasetChanged();
            }
            public int getItemCount(int series) {
                return this.underlying.getItemCount(series);
            }
            public double getXValue(int series, int item) {
                return this.underlying.getXValue(series, item) + translate;
            }
            public Number getX(int series, int item) {
                return new Double(getXValue(series, item));
            }
            public Number getY(int series, int item) {
                return new Double(getYValue(series, item));
            }
            public double getYValue(int series, int item) {
                return this.underlying.getYValue(series, item);
            }
            public int getSeriesCount() {
                return this.underlying.getSeriesCount();
            }
            public Comparable getSeriesKey(int series) {
                return underlying.getSeriesKey(series);
            }
            public void datasetChanged(DatasetChangeEvent event) {
                // underlying dataset has changed, so notify our listeners
                this.fireDatasetChanged();
            }
        }
        
        /**
         * Creates a new demo panel.
         */
        public DemoPanel() {
            super(new BorderLayout());
            this.chart = createChart();
            this.chartPanel = new ChartPanel(this.chart);
            this.chartPanel.setPreferredSize(new java.awt.Dimension(600, 270));
            this.chartPanel.setDomainZoomable(true);
            this.chartPanel.setRangeZoomable(true);
            Border border = BorderFactory.createCompoundBorder(
                BorderFactory.createEmptyBorder(4, 4, 4, 4),
                BorderFactory.createEtchedBorder()
            );
            this.chartPanel.setBorder(border);
            add(this.chartPanel);
            
            JPanel dashboard = new JPanel(new BorderLayout());
            dashboard.setBorder(BorderFactory.createEmptyBorder(0, 4, 4, 4));   
            // make the slider units "minutes"
            this.slider = new JSlider(-200, 200, 0);
            slider.setPaintLabels(true);
            slider.setMajorTickSpacing(50);
            slider.setPaintTicks(true);
            this.slider.addChangeListener(this);
            dashboard.add(this.slider);
            add(dashboard, BorderLayout.SOUTH);
        }
        
        /**
         * Creates the demo chart.
         * 
         * @return The chart.
         */
        private JFreeChart createChart() {

            XYDataset dataset1 = createDataset(
                "Random 1", 100.0, new Minute(), 200
            );
            
            JFreeChart chart1 = ChartFactory.createTimeSeriesChart(
                "Translate Demo 1", 
                "Time of Day", 
                "Value",
                dataset1, 
                true, 
                true, 
                false
            );

            chart1.setBackgroundPaint(Color.white);
            XYPlot plot = chart1.getXYPlot();
            plot.setOrientation(PlotOrientation.VERTICAL);
            plot.setBackgroundPaint(Color.lightGray);
            plot.setDomainGridlinePaint(Color.white);
            plot.setRangeGridlinePaint(Color.white);
            plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
            
            plot.setDomainCrosshairVisible(true);
            plot.setDomainCrosshairLockedOnData(false);
            plot.setRangeCrosshairVisible(false);
            XYItemRenderer renderer = plot.getRenderer();
            renderer.setPaint(Color.black);
            // fix the range
            DateAxis axis = (DateAxis) plot.getDomainAxis();
            Range range = DatasetUtilities.findDomainBounds(dataset);
            axis.setRange(range);
            return chart1;
        }
        
        
        /**
         * Creates a sample dataset.
         * 
         * @param name  the dataset name.
         * @param base  the starting value.
         * @param start  the starting period.
         * @param count  the number of values to generate.
         *
         * @return The dataset.
         */
        private XYDataset createDataset(String name, double base, 
                                        RegularTimePeriod start, int count) {

            this.series = new TimeSeries(name, start.getClass());
            RegularTimePeriod period = start;
            double value = base;
            for (int i = 0; i < count; i++) {
                this.series.add(period, value);    
                period = period.next();
                value = value * (1 + (Math.random() - 0.495) / 10.0);
            }

            TimeSeriesCollection tsc = new TimeSeriesCollection();
            tsc.addSeries(this.series);
            this.dataset = new TranslatingXYDataset(tsc);
            return dataset;

        }
        
        /**
         * Handles a state change event.
         * 
         * @param event  the event.
         */
        public void stateChanged(ChangeEvent event) {
            int value = this.slider.getValue();
            // value is in minutes
            this.dataset.setTranslate(value * 60 * 1000.0);
        }

    }
    
    /**
     * A demonstration application showing how to control a crosshair using an
     * external UI component.
     *
     * @param title  the frame title.
     */
    public TranslateDemo(String title) {
        super(title);
        setContentPane(new DemoPanel());
    }

    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        return new DemoPanel();
    }

    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        TranslateDemo demo = new TranslateDemo("Translate Demo 1");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }
    
}