How do I change a JFreeChart's size

问题:

I\'ve added a JFreeChart to a JPanel (using a BorderLayout), and it\'s huge. Is there something I can do to make it smaller?

public void generateChart()
{
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();

    //set the values of the chart
    for(int i=0; i<8; i++)
    {
        dataset.setValue(income_array[i], \"Income\",
            Double.toString(percent_array[i]));
    }

    JFreeChart chart = ChartFactory.createBarChart(
        \"Required Annual Income for a Variety of Interest Rates\",
        \"Percent\", \"Income\", dataset, PlotOrientation.VERTICAL,
        false,true, false);
    ChartPanel cp = new ChartPanel(chart);

    chart.setBackgroundPaint(Color.white);
    chart.getTitle().setPaint(Color.black); 
    CategoryPlot p = chart.getCategoryPlot(); 
    p.setRangeGridlinePaint(Color.blue); 

    //cp.setMaximumDrawHeight(5);
    //cp.setMaximumDrawWidth(5);
    //cp.setZoomOutFactor(.1);
    JPanel graph = new JPanel();
    graph.add(cp);
    middle.add(graph, BorderLayout.CENTER);
}   

回答1:

When you create your ChartPanel, you have several options that affect the result:

1. Accept the DEFAULT_WIDTH and DEFAULT_HEIGHT: 680 x 420.

2. Specify the preferred width and height in the constructor.

3. Invoke setPreferredSize() explicitly if appropriate.

4. Override getPreferredSize() to calculate the size dynamically.

   @Override
   public Dimension getPreferredSize() {
       // given some values of w & h
       return new Dimension(w, h);
   }
   

5. Choose the layout of the container to which the ChartPanel will be added. Note that the default layout of JPanel is FlowLayout, while that of JFrame is BorderLayout. As a concrete example, ThermometerDemo uses both preferred values in the constructor and a GridLayout for the container to allow dynamic resizing.

回答2:

In addition to answer \"4\" of @trashgod, I had the same problem and managed to solve it like this: (1) create a custom class which extends JPanel (2) get the size somehow, that you would like to pass to your chart (3) create a method which returns a \"ChartPanel\" object like this:

ChartPanel chart() {
    //... custom code here
    JFreeChart chart = ChartFactory.createPieChart(title, pieDataset, false, false, false );`enter code here`
    // Now: this is the trick to manage setting the size of a chart into a panel!:
    return new ChartPanel(chart) { 
        public Dimension getPreferredSize() {
            return new Dimension(width, height);
        }
    };
}

I prepared a SSCCE to let you know how it works:

import java.awt.Dimension;
import java.util.ArrayList;
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.data.general.DefaultPieDataset;

public class MyPieChart extends JPanel {

    public static void main(String[] args) {
        example1();
        example2();
        example3();
    }

    public static void example1() {
        JPanel panel = new JPanel();
        panel.setBounds(50, 80, 100, 100);
        MyPieChart piePanel = new MyPieChart(\"Example 1\", dataset(), panel);
        panel.add(piePanel);
        JFrame frame = new JFrame();
        frame.setLayout(null); 
        frame.setBounds(10, 10, 200, 300);
        frame.add(panel);
        frame.setVisible(true);
    }

    public static void example2() {
        MyPieChart piePanel = new MyPieChart(\"Example 2\", dataset(), 30, 50, 100, 100);
        JFrame frame = new JFrame();
        frame.setLayout(null); 
        frame.setBounds(210, 10, 200, 300);
        frame.add(piePanel);
        frame.setVisible(true);
    }

    public static void example3() {
        MyPieChart piePanel = new MyPieChart(\"Example 3\", dataset(), 100, 100);
        piePanel.setLocation(0,0);
        JFrame frame = new JFrame();
        frame.setLayout(null); 
        frame.setBounds(410, 10, 200, 300);
        frame.add(piePanel);
        frame.setVisible(true);
    }

    static ArrayList<ArrayList<String>> dataset() {
        ArrayList<ArrayList<String>> dataset = new ArrayList<ArrayList<String>>();
        dataset.add(row( \"Tom\", \"LoggedIn\", \"Spain\" ));
        dataset.add(row( \"Jerry\", \"LoggedOut\", \"England\" ));
        dataset.add(row( \"Gooffy\", \"LoggedOut\", \"France\" ));
        return dataset;
    }

    static ArrayList<String> row(String name, String actualState, String country) {
        ArrayList<String> row = new ArrayList<String>();
        row.add(name); row.add(actualState); row.add(country); 
        return row;
    }

    ArrayList<ArrayList<String>> dataset;
    DefaultPieDataset pieDataset = new DefaultPieDataset(); 
    int width, height, posX, posY;
    int colState = 1;
    String title;
    String LoggedIn = \"LoggedIn\";
    String LoggedOut = \"LoggedOut\";

    public MyPieChart(String title, ArrayList<ArrayList<String>> dataset, int...args) {

        if(args.length==2) {
            this.width = args[0];
            this.height = args[1];
            this.setSize(width, height);
        }
        else if(args.length==4) {
            this.posX = args[0];
            this.posY = args[1];
            this.width = args[2];
            this.height = args[3];
            this.setBounds(posX, posY, width, height);
        }
        else {
            System.err.println(\"Error: wrong number of size/position arguments\");
            return;
        }

        this.title = title;
        this.dataset = dataset;
        this.add(chart());
    }

    public MyPieChart(String title, ArrayList<ArrayList<String>> dataset, JPanel panel) {
        this.title = title;
        this.dataset = dataset;
        this.width = panel.getWidth();
        this.height = panel.getHeight();
        this.setBounds(panel.getBounds());
        this.add(chart());
    }

    ChartPanel chart() {

        int totalLoggedIn = 0;
        int totalLoggedOut = 0;

        for(ArrayList<String> user : dataset) {
            if(user.get(colState).equals(LoggedIn)) totalLoggedIn++;
            else totalLoggedOut++;
        }
        pieDataset.clear();
        pieDataset.setValue(LoggedIn +\": \"+ totalLoggedIn, totalLoggedIn);
        pieDataset.setValue(LoggedOut +\": \"+ totalLoggedOut, totalLoggedOut);

        JFreeChart chart = ChartFactory.createPieChart(title, pieDataset, false, false, false );

        return new ChartPanel(chart) { // this is the trick to manage setting the size of a chart into a panel!
            public Dimension getPreferredSize() {
                return new Dimension(width, height);
            }
        };
    }
}

I really hope it helps!

回答3:

I had a problem with my pie chart being too big with BorderLayout too. I ended up solving my problem by converting the chart to an image instead.

Before

After

Code

 private PieDataset updateCSFDataSet(){
        DefaultPieDataset dataSet = new DefaultPieDataset();
            dataSet.setValue(\"Clear(\" + clearCount + \")\" , clearCount);
            dataSet.setValue(\"Smoky(\" + smokyCount + \")\", smokyCount);
            dataSet.setValue(\"Foggy(\" + foggyCount + \")\", foggyCount);
            dataSet.setValue(\"Skipped(\" + skipCount + \")\", skipCount);
            dataSet.setValue(\"Unlabeled(\" + unlabeledCount + \")\", unlabeledCount);
        return dataSet;
    }

    private ImageIcon createChart(String title, PieDataset dataSet){
        JFreeChart chart = ChartFactory.createPieChart(
                title,
                dataSet,
                true,
                false,
                false
        );

        PiePlot plot = (PiePlot) chart.getPlot();
        plot.setLabelFont(new Font(\"SansSerif\", Font.PLAIN, 12));
        plot.setNoDataMessage(\"No data available\");
        plot.setCircular(true);
        plot.setIgnoreZeroValues(true);
        plot.setLabelGap(0.02);

        return new ImageIcon(chart.createBufferedImage(400,300));
    }

回答4:

Try setting the size of the Panel your chart is in.

You might need to set both JPanel middle and ChartPanel cp

回答5:

http://www.jfree.org/phpBB2/viewtopic.php?f=3&t=18631

http://www.jfree.org/forum/viewtopic.php?f=3&t=109615

http://www.jfree.org/phpBB2/viewtopic.php?f=3&t=31582