更改 y 轴和 x 轴值的字体大小

Question

In the following code, I want to reduce the font size of the y-axis and x-axis values.

I searched and found these code:

suppose you want to reduce the font size of number axis use the following code:

Font nwfont=new Font("Arial",0,7);
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setTickLabelFont(nwfont);

suppose you want to reduce the font size of CategoryAxis use the following code:

CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setTickLabelFont(nwfont);

but unfortunately, the size of the axes did not decrease. Did I do something wrong?

this sample code:

 public class NegativeExpPlot {

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

        private void display() {
            int nData = 100;
            Random r = new Random(nData);
            XYSeries ds1 = new XYSeries("rand");
            for (int i = 0; i < nData; i++) {
                ds1.add(r.nextDouble(), r.nextDouble() / 1000);
            }
            for (int i = 0; i < nData; i++) {
                ds1.add(r.nextDouble(), r.nextDouble() * 1000);
            }
            LogAxis logAxis = new LogAxis("log");
            XYPlot p = new XYPlot(new XYSeriesCollection(ds1), new NumberAxis(),
                logAxis, new XYLineAndShapeRenderer());
            logAxis.setNumberFormatOverride(new DecimalFormat("0.0E0"));
            Font nwfont=new Font("Arial",0,1);
            logAxis.setTickLabelFont(nwfont);
            JFreeChart chart = new JFreeChart(p);
            JFrame f = new JFrame("Log Axis");
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.add(new ChartPanel(chart));
            f.pack();
            f.setLocationRelativeTo(null);
            f.setVisible(true);
            NumberAxis rangeAxis = (NumberAxis) p.getRangeAxis();
            rangeAxis.setTickLabelFont(nwfont);
        }

    }

Answer 1

If you want to change the font size you need to use .setLabelFont() instead of setTickLabelFont() . You can see it on this post

this:

Font nwfont = new Font("Arial", Font.PLAIN, 10);
NumberAxis rangeAxis = (NumberAxis) p.getRangeAxis();
rangeAxis.setLabelFont(nwfont);

will produce this

if I change the 10 to 1 I will get this wich is unreadble

If it's still not respond to your question can you elaborate more what you need?

EDIT:

You were right you need to use setTickLabelFont() but in your Font you need to use the Font.PLAIN instead of 0

Answer 2

This is a bug, reported in issue #98 : setTickLabelFont is not respected for LogAxis if setNumberFormatOverride is used . It is fixed in branch v1.5.x . You can omit the override, use the workaround in the bug report, or build jfreechart-1.5.4-SNAPSHOT.jar , illustrated, like this .

import java.awt.EventQueue;
import java.awt.Font;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.Random;
import javax.swing.JFrame;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.LogAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/** @see https://stackoverflow.com/q/70758061/230513 */
public class ExpoTest {

    private static final int N = 100;
    private static final Font FONT = new Font(Font.SANS_SERIF, Font.BOLD, 16);

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

    private void display() {
        Random r = new Random();
        XYSeries series = new XYSeries("rand");
        for (int i = 0; i < N; i++) {
            series.add(r.nextDouble(), r.nextDouble() / 1000);
        }
        NumberAxis domainAxis = new NumberAxis();
        domainAxis.setTickLabelFont(FONT);
        LogAxis rangeAxis = new LogAxis("log");
        rangeAxis.setTickLabelFont(FONT);
        rangeAxis.setNumberFormatOverride(new DecimalFormat("0.0E0"));
        XYPlot p = new XYPlot(new XYSeriesCollection(series), domainAxis,
            rangeAxis, new XYLineAndShapeRenderer());
        JFreeChart chart = new JFreeChart(p);
        JFrame f = new JFrame("Log Axis");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new ChartPanel(chart));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}