java如何在jfree中从日志10切换到日志2
我正在使用JFree生成图表。下图供您参考。如图所示,当前比例基于10,因此x轴比例中有101001000。是否可以将其更改为日志2。因此,在log 2的情况下,点将是可见的2、4、8、16、32、64等等。类对数轴。java正在用于渲染x轴
如果可能的话,请告诉我
下面的代码生成日志2比例,但我无法垂直设置x轴点,这对我来说非常重要
public class TestHello {
/** @see http://stackoverflow.com/a/10353270/230513 */
private static void createFrame() {
int N=22;
XYSeries series = new XYSeries("Series");
for (int i = 0; i <= N; i++) {
System.out.println(Math.pow(2, i));
Random r = new Random();
double randomInt = r.nextInt(100) + 1;
series.add(Math.pow(2, i),randomInt);
}
NumberAxis yAxis = new NumberAxis("Y");
yAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
LogAxis xAxis = new LogAxis("X");
xAxis.setBase(2);
xAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
xAxis.setVerticalTickLabels(true);
JFreeChart chart = ChartFactory.createXYLineChart(
"Text", "x", "y", new XYSeriesCollection(series),
PlotOrientation.VERTICAL, true, true, false);
final XYPlot plot = chart.getXYPlot();
plot.setBackgroundPaint(Color.WHITE);
plot.setDomainAxis(xAxis);
plot.setRangeAxis(yAxis);
final Marker start = new ValueMarker(60.0);
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
renderer.setLegendLine(new Line2D.Double(-20.0D, 0.0D, 20.0D, 0.0D));
Shape square = new Rectangle2D.Double(-2.0, -2.0, 3.0, 3.0);
renderer.setSeriesShape(0, square);
plot.setRenderer(renderer);
plot.addRangeMarker(start);
JFrame frame = new JFrame("LogAxis Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new ChartPanel(chart));
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
createFrame();
}
});
}
}
# 1 楼答案
尝试使用
LogAxis
类而不是LogarithmicAxis
类(由于历史原因,有两个),并在设置轴时调用axis.setBase(2.0)