如何在JFreeChart显示后更新它？ [英] How can I update a JFreeChart's appearance after it's been made visible?

问题描述

如何使用 JFreeChart 来动态更新图表的外观在显示后？

推荐答案

类 ChartPanel 很方便，因为它有控制图表整体外观的方法，包括属性和缩放状态。此外，还可以访问图表的组件，如下所示。这个相关的示例说明了一个 JToolBar 的缩放按钮。

The class ChartPanel is convenient for this, as it has methods to control the chart's overall appearance, including properties and zoom state. In addition it's also possible to access the chart's components, as shown below. This related example illustrates a JToolBar of zoom buttons.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import javax.swing.AbstractAction;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
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.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;

/** @see http://stackoverflow.com/questions/5522575 */
public class ChartPanelDemo {

    private static final String title = "Return On Investment";
    private ChartPanel chartPanel = createChart();

    public ChartPanelDemo() {
        JFrame f = new JFrame(title);
        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);

        JPanel panel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        panel.add(createTrace());
        panel.add(createDate());
        panel.add(createZoom());
        f.add(panel, BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private JComboBox createTrace() {
        final JComboBox trace = new JComboBox();
        final String[] traceCmds = {"Enable Trace", "Disable Trace"};
        trace.setModel(new DefaultComboBoxModel(traceCmds));
        trace.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if (traceCmds[0].equals(trace.getSelectedItem())) {
                    chartPanel.setHorizontalAxisTrace(true);
                    chartPanel.setVerticalAxisTrace(true);
                    chartPanel.repaint();
                } else {
                    chartPanel.setHorizontalAxisTrace(false);
                    chartPanel.setVerticalAxisTrace(false);
                    chartPanel.repaint();
                }
            }
        });
        return trace;
    }

    private JComboBox createDate() {
        final JComboBox date = new JComboBox();
        final String[] dateCmds = {"Horizontal Dates", "Vertical Dates"};
        date.setModel(new DefaultComboBoxModel(dateCmds));
        date.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                JFreeChart chart = chartPanel.getChart();
                XYPlot plot = (XYPlot) chart.getPlot();
                DateAxis domain = (DateAxis) plot.getDomainAxis();
                if (dateCmds[0].equals(date.getSelectedItem())) {
                    domain.setVerticalTickLabels(false);
                } else {
                    domain.setVerticalTickLabels(true);
                }
            }
        });
        return date;
    }

    private JButton createZoom() {
        final JButton auto = new JButton(new AbstractAction("Auto Zoom") {

            @Override
            public void actionPerformed(ActionEvent e) {
                chartPanel.restoreAutoBounds();
            }
        });
        return auto;
    }

    private ChartPanel createChart() {
        XYDataset roiData = createDataset();
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            title, "Date", "Value", roiData, true, true, 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(2005 + i), Math.pow(2, i) * scale);
        }
        return series;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ChartPanelDemo cpd = new ChartPanelDemo();
            }
        });
    }
}

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