JFreeChart格式Y轴显示Power中的值

如何格式化y轴显示值为5 * 10 ^ 5,1 * 10 ^ 6,2 * 10 ^ 6 …而不是500,000,1,000,000,2,000,000 ……并且可以被5或10整除？

Answer 1

具有默认刻度单位的LogAxis似乎有效。 此相关示例使用整数刻度单位。

 import java.awt.Dimension; import java.awt.EventQueue; 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/a/22450677/230513 * @see https://stackoverflow.com/a/10353270/230513 */ public class Test { private static final int N = 7; private void display() { XYSeries series = new XYSeries("Series"); for (int i = 0; i <= N; i++) { series.add(i, Math.pow(10, i)); } NumberAxis xAxis = new NumberAxis("X"); xAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); LogAxis yAxis = new LogAxis("Y"); XYPlot plot = new XYPlot(new XYSeriesCollection(series), xAxis, yAxis, new XYLineAndShapeRenderer(true, false)); JFreeChart chart = new JFreeChart( "Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, false); JFrame f = new JFrame("Test"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(new ChartPanel(chart) { @Override public Dimension getPreferredSize() { return new Dimension(480, 240); } }); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new Test().display(); } }); } }