数字轴setTickUnit包含指定数字 [英] Number axis setTickUnit to contain a specified number

问题描述

我正在使用JFreeChart显示正态分布，并将刻度号更改为标准偏差；但我也希望在中间出现刻度线时始终具有平均"价值.交叉发布在此处.

I am displaying normal distribution using JFreeChart, and I change the tick number to standard deviation; but I would also want there to always be 'mean' value in the middle from which ticks emerge. Cross-posted here.

所以标准偏差= 2;平均值= 1

So standard deviation = 2 ; mean = 1

-3 -1  1 3 5

标准偏差= 5;平均值= 15

Standard deviation = 5 ; mean = 15

0 5 10 15 20 25 30

JFreeChart.java

JFreeChart.java

public class JFreeChartPanel extends JPanel {
    private final XYPlot plot;
    double mean = 0.0, sd = 1.0;
    XYDataset dataset = initDataset();
    NumberAxis domain = new NumberAxis("Y") {
    @Override
    protected double calculateLowestVisibleTickValue() {
        double lowTickValue = super.calculateLowestVisibleTickValue();
        if (mean % 2 == 1) {
            return lowTickValue + 1;
        } else {
            return lowTickValue;
        }
    }
};
    public JFreeChartPanel(){
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Normal Distribution",
            "X", 
            "PDF", 
            dataset,
            PlotOrientation.VERTICAL,
            false,
            false,
            false
        );
        plot=chart.getXYPlot();
        domain.setAutoRangeStickyZero(false);
        domain.setTickUnit(new NumberTickUnit(sd));
        plot.setDomainAxis(domain);
        final ChartPanel chartPanel = new ChartPanel(chart);
        setLayout(new BorderLayout());
        add(chartPanel);
    }

    private XYDataset initDataset() {
        double minX=mean-(4*sd),maxX=mean+(4*sd);
        Function2D normal = new NormalDistributionFunction2D(mean, sd);
        XYDataset dataset = DatasetUtilities.sampleFunction2D(normal, minX, maxX, 100, "Normal");
        return dataset;
    }

    public double getMean() {
        return mean;
    }

    public void setMean(double mean) {
       this.mean = mean;
       plot.setDataset(initDataset());
    }

    public double getSd() {
        return sd;
    }

    public void setSd(double sd) {
        this.sd = sd;
        domain.setTickUnit(new NumberTickUnit(sd));
        plot.setDataset(initDataset());
    }
}

UI.java

public class UI extends javax.swing.JFrame {

    public UI() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {
      Auto-generated Netbeans GUI COde
    }                     

    public void updateMean()
    {
        try{
            double m = Double.parseDouble(mean.getText());
            jFreeChartPanel.setMean(m);
        }catch(Exception e){
        }
    }
    public void updateSd()
    {
        try{
            double sd = Double.parseDouble(standardDeviation.getText());
            jFreeChartPanel.setSd(sd);
        }catch(Exception e){
        }
    }

    public static void main(String args[]) {
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {

        }
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new UI().setVisible(true);
            }
        });
    }

    private javax.swing.JPanel inputPanel;
    private main.JFreeChartPanel jFreeChartPanel;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JToggleButton jToggleButton1;
    private javax.swing.JTextField mean;
    private javax.swing.JLabel meanLabel;
    private javax.swing.JTextField standardDeviation;
    private javax.swing.JLabel standardDeviationLabel;
}

推荐答案

从这个示例开始，我做了以下工作根据您的变化进行更改，以得到以下所示的µ = 15和σ= 5的结果:

Starting from this example, I made the following changes, adapted from yours, to get the result illustrated below for µ=15 and σ=5:

import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
…
private double mean = 15.0, sigma = 5.0;
…
private XYDataset initDataset() {
    double minX = mean - (3 * sigma), maxX = mean + (3 * sigma);
    Function2D normal = new NormalDistributionFunction2D(mean, sigma);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(normal, minX, maxX, 100, "Normal");
    return dataset;
}
…
public JFreeChartPanel() {
    …
    plot = chart.getXYPlot();
    NumberAxis domain = (NumberAxis) plot.getDomainAxis();
    domain.setTickUnit(new NumberTickUnit(sigma));
    …
}

在另一种情况下，µ = 1和σ= 2，需要重写NumberAxis方法calculateLowestVisibleTickValue()，以使刻度线落在奇数值上.

Your other case, µ=1 and σ=2, requires overriding the NumberAxis method calculateLowestVisibleTickValue() to make ticks fall on odd values.

NumberAxis domain = new NumberAxis("Y") {
    @Override
    protected double calculateLowestVisibleTickValue() {
        double lowTickValue = super.calculateLowestVisibleTickValue();
        if (mean % 2 == 1) {
            return lowTickValue + 1;
        } else {
            return lowTickValue;
        }
    }
};
domain.setTickUnit(new NumberTickUnit(sigma));
plot = chart.getXYPlot();
plot.setDomainAxis(domain);

为什么图形的平均值3和sd 1也略微偏斜，平均值6 sd 2，平均值9 sd 3依此类推；以此类推；这是显示此内容的图片.

如此处所述，自动确定范围时，会影响到添加到轴范围的边距大小的标记."

As discussed here, there's "A flag that affects the size of the margins added to the axis range when the range is determined automatically."

domain.setAutoRangeStickyZero(false);

我添加了...代码.

I've added…code.

将修订版6 JFreeChartPanel的实例添加到具有== 1和σ= 2的JFrame产生以下结果:

Adding and instance of your revision 6 JFreeChartPanel to a JFrame with µ=1 and σ=2 produces the following result:

这种情况的发生率更高.

This happens with higher mean.

您可以从自动量程中排除零.

You can exclude zero from the auto-range.

domain.setAutoRangeIncludesZero(false);

这篇关于数字轴setTickUnit包含指定数字的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！