Java – abnormal behavior of the zoom in and zoom out function of JfreeChart?
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Java
I observed that the functions of "zoom in" and "zoom out" were completely different from those expected For example, when I perform a zoom out step, then step back in zoom I can't see the original picture anymore
I don't see that the zoom in and zoom out functions of JfreeChart are synchronized
public class ChartPanelDemo {
private static final String title = "Historical Data Graph";
private ChartPanel chartPanel = createChart();
private JButton ZoomX;
private JButton ZoomY;
private JButton Zoom;
private JButton ZoomXOut;
private JButton ZoomYOut;
private JButton ZoomOut;
private JButton originalGraph;
private JButton xscaleInc;
private JButton xscaleDec;
private NumberAxis domainAxis;
private NumberAxis rangeAxis;
private int UNITS = 1;
private static final int COUNT = 100;
private JPanel panel;
private double[][] sizeFr = { { TableLayout.FILL },{ TableLayout.FILL } };
public ChartPanelDemo() {
JFrame f = new JFrame(title);
panel = new JPanel();
f.setTitle(title);
f.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(new BorderLayout(0,5));
f.add(chartPanel,BorderLayout.CENTER);
chartPanel.setMouseWheelEnabled(true);
// chartPanel.setHorizontalAxisTrace(true);
// chartPanel.setVerticalAxisTrace(true);
chartPanel.setZoomInFactor(0.9);
chartPanel.setZoomOutFactor(0.9);
JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
panel.add(createTrace());
panel.add(createDate());
panel.add(createZoom());
panel.add(createZoomOutX());
panel.add(createZoomOutY());
panel.add(createZoomOut());
panel.add(toOriginalGraph());
panel.add(AutoScaleDecXaxis());
//panel.add(AutoScaleDecXaxis());
f.add(panel,BorderLayout.soUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private JSpinner AutoScaleDecXaxis() {
final JSpinner spinner = new JSpinner(
new SpinnerNumberModel(UNITS,1,COUNT,1));
spinner.addchangelistener(new changelistener() {
@Override
public void stateChanged(ChangeEvent e) {
JSpinner s = (JSpinner) e.getSource();
Number n = (Number) s.getValue();
domainAxis.setTickUnit(new NumberTickUnit(n.intValue()));
}
});
return spinner;
}
private JButton toOriginalGraph() {
originalGraph = new JButton(new AbstractAction("RestoreGraph") {
@Override
public void actionPerformed(ActionEvent e) {
chartPanel.restoreAutoBounds();
}
});
return originalGraph;
}
private JButton createZoomOut() {
ZoomOut = new JButton(new AbstractAction("ZoomOut") {
@Override
public void actionPerformed(ActionEvent e) {
ZoomOut.setActionCommand(chartPanel.ZOOM_OUT_BOTH_COMMAND);
ZoomOut.addActionListener(chartPanel);
}
});
return ZoomOut;
}
private JButton createZoomOutY() {
ZoomYOut = new JButton(new AbstractAction("ZoomOutY") {
@Override
public void actionPerformed(ActionEvent e) {
ZoomYOut.setActionCommand(chartPanel.ZOOM_OUT_RANGE_COMMAND);
ZoomYOut.addActionListener(chartPanel);
}
});
return ZoomYOut;
}
private JButton createZoomOutX() {
ZoomXOut = new JButton(new AbstractAction("ZoomOutX") {
@Override
public void actionPerformed(ActionEvent e) {
ZoomXOut.setActionCommand(chartPanel.ZOOM_OUT_DOMAIN_COMMAND);
ZoomXOut.addActionListener(chartPanel);
}
});
return ZoomXOut;
}
private JButton createTrace() {
ZoomX = new JButton(new AbstractAction("ZoomInX") {
@Override
public void actionPerformed(ActionEvent e) {
ZoomX.setActionCommand(chartPanel.ZOOM_IN_DOMAIN_COMMAND);
ZoomX.addActionListener(chartPanel);
// chartPanel.restoreAutoBounds();
}
});
return ZoomX;
}
private JButton createDate() {
ZoomY = new JButton(new AbstractAction("ZoomInY") {
@Override
public void actionPerformed(ActionEvent e) {
ZoomY.setActionCommand(chartPanel.ZOOM_IN_RANGE_COMMAND);
ZoomY.addActionListener(chartPanel);
}
});
return ZoomY;
}
private JButton createZoom() {
Zoom = new JButton(new AbstractAction("Zoom") {
@Override
public void actionPerformed(ActionEvent e) {
Zoom.setActionCommand(chartPanel.ZOOM_IN_BOTH_COMMAND);
Zoom.addActionListener(chartPanel);
}
});
return Zoom;
}
private ChartPanel createChart() {
XYDataset roiData = createDataset();
JFreeChart chart = createChart(roiData);
chart.setBackgroundPaint(new Color(0xBBBBDD));
XYPlot plot = chart.getXYPlot();
XYSplineRenderer r = new XYSplineRenderer(20);
plot.setRenderer(r);
r.setBaseShapesVisible(true);
rangeAxis = (NumberAxis) plot.getRangeAxis();
domainAxis = (NumberAxis) plot.getDomainAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
domainAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
return new ChartPanel(chart);
}
private JFreeChart createChart(XYDataset dataset) {
JFreeChart chart = ChartFactory.createXYLineChart("Historical Data",// chart
// title
"X",// x axis label
"Y",// y axis label
dataset,// data
PlotOrientation.VERTICAL,true,// include legend
true,// tooltips
false // urls
);
return chart;
}
private XYDataset createDataset() {
XYSeries series1 = new XYSeries("First");
series1.add(1.0,1.0);
series1.add(2.0,4.0);
series1.add(3.0,3.0);
series1.add(4.0,5.0);
series1.add(5.0,5.0);
series1.add(6.0,7.0);
series1.add(7.0,7.0);
series1.add(8.0,8.0);
XYSeries series2 = new XYSeries("Second");
series2.add(1.0,5.0);
series2.add(2.0,7.0);
series2.add(3.0,6.0);
series2.add(4.0,8.0);
series2.add(5.0,4.0);
series2.add(6.0,4.0);
series2.add(7.0,2.0);
series2.add(8.0,1.0);
XYSeriesCollection dataset = new XYSeriesCollection();
dataset.addSeries(series1);
dataset.addSeries(series2);
return dataset;
}
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
ChartPanelDemo cpd = new ChartPanelDemo();
}
});
}
}
Question 2: after clicking zoominx twice
Click zoomoutx twice again (this is the original chart)
But after clicking zoominx twice again, I see that the chart is different, not the first image in this problem
Solution
Your example seems to be a hybrid of the two proposed method, here, which calls the handler of the chart panel from your own actionPerformed () implementation. Although chart panel handlers are reusable, they are not reentrant Instead, the implementation of the chart panel is used directly The following example highlights two buttons for zooming in and out of a field:
toolBar.add(createButton("Zoom In X",ZOOM_IN_DOMAIN_COMMAND));
toolBar.add(createButton("Zoom Out X",ZOOM_OUT_DOMAIN_COMMAND));
…
private JButton createButton(String name,String command) {
final JButton b = new JButton(name);
b.setActionCommand(command);
b.addActionListener(chartPanel);
return b;
}
After clicking zoom in X:
After clicking zoom out X:
This complete example recalculates the createbutton () method to use the available scaling handlers and is illustrated using jtoolbar
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.text.NumberFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.Year;
import org.jfree.data.xy.XYDataset;
import static org.jfree.chart.ChartPanel.*;
/** @see https://stackoverflow.com/a/41337259/230513 */
public class ZoomDemo {
private static final String TITLE = "Return On Investment";
private final ChartPanel chartPanel = createChart();
public ZoomDemo() {
JFrame f = new JFrame(TITLE);
f.setTitle(TITLE);
f.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(new BorderLayout(0,BorderLayout.CENTER);
chartPanel.setMouseWheelEnabled(true);
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);
f.add(panel,BorderLayout.soUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private JButton createButton(String name,String command) {
final JButton b = new JButton(name);
b.setActionCommand(command);
b.addActionListener(chartPanel);
return b;
}
private ChartPanel createChart() {
XYDataset roiData = createDataset();
JFreeChart chart = ChartFactory.createTimeSeriesChart(
TITLE,"Date","Value",roiData,false);
XYPlot plot = chart.getXYPlot();
XYLineAndShapeRenderer renderer =
(XYLineAndShapeRenderer) plot.getRenderer();
renderer.setBaseShapesVisible(true);
NumberFormat currency = NumberFormat.getCurrencyInstance();
currency.setMaximumFractionDigits(0);
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setNumberFormatOverride(currency);
return new ChartPanel(chart);
}
private XYDataset createDataset() {
TimeSeriesCollection tsc = new TimeSeriesCollection();
tsc.addSeries(createSeries("Projected",200));
tsc.addSeries(createSeries("Actual",100));
return tsc;
}
private TimeSeries createSeries(String name,double scale) {
TimeSeries series = new TimeSeries(name);
for (int i = 0; i < 6; i++) {
series.add(new Year(2016 + i),Math.pow(2,i) * scale);
}
return series;
}
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
ZoomDemo cpd = new ZoomDemo();
}
});
}
}
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