java - 使用 JfreeChart 向 XYSeries 动态添加点

Question

我在向 XYSeries 添加点时遇到问题。我有两个类(class)。一个是Sample(它有一个main方法)，另一个是JfreeChart(它有JfreeChart代码) .在我的 Sample 类中，我有一个二维数组 sample[row][2] 最初有 10 行，然后我需要调用 JfreeChart 类并将它们添加到 XYSeries 并显示散点图。我设法做到了这一点，但下次我调用 Jfreechart 类时，我的数组有 25 行。

我需要将这些值添加到 XYSeries 并将它们绘制在散点图上，该散点图应该以不同的颜色显示较早的 10 行值，现在以不同的颜色显示 25 行的值……这样继续下去。任何人都可以提供一些建议或示例吗？

class Sample {

    public static void main(String args[]) {
        System.out.print("(X,Y) Paired Values");
        double[][] sample = new double[row][2];

        for (int g = 0; g < sampe.length; g++) {
            for (int h = 0; h < 2; h++) {
                System.out.print("" + sample[g][h] + ",");
            }
        }
        JfreeChart sample = new JfreeChart("Demo", sample);
    }

    static XYDataset samplexydataset2(double[][] sample) {
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("DataSet");
        for (int x = 0; x < sample.length; x++) {
            series.add(sample[x][0], sample[x][1]);
        }
        xySeriesCollection.addSeries(series);
        return xySeriesCollection;
    }
}

1) 当我调用“第一次”JfreeChart 类时，我将在我的示例数组中包含这些对

(0.78,0.80)(0.21,0.19)(0.181,0.187)

2) 当我“第二次”调用 JfreeChart 类时，我的示例数组中将有不同的值(0.20,0.19)(0.8,0.79)(0.41,0.45)(0.77,0.79)(0.54,0.65)

这有几次(10 次)所以我需要将它添加到“XYSeries”和“XYSeriesCollection”，并在我第二次调用 JFreeChart 类时显示“第一次”值和“第二次”值

Answer 1

您可以向 XYSeries 添加新值使用可用的 add() 方法之一，如 example 所示.如果你得到不定行，你需要发布一个 sscce .

附录:更仔细地观察(最近更新)genesis在您的示例中，有些困惑是可以理解的:根本不需要数组。下面的示例包含一个按钮，用于将新样本添加到第二个系列。

Can I change the Color of Points when I click the "Add" Button?

每个新系列都是一种新颜色，如图example .要更改个别颜色，推荐的方法是重写渲染器的 getItemPaint() 方法，如图所示 here .

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.*;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * @see https://stackoverflow.com/questions/7205742
 * @see https://stackoverflow.com/questions/7208657
 * @see https://stackoverflow.com/questions/7071057
 */
public class ScatterAdd extends JFrame {

    private static final int N = 8;
    private static final String title = "Scatter Add Demo";
    private static final Random rand = new Random();
    private XYSeries added = new XYSeries("Added");

    public ScatterAdd(String s) {
        super(s);
        final ChartPanel chartPanel = createDemoPanel();
        this.add(chartPanel, BorderLayout.CENTER);
        JPanel control = new JPanel();
        control.add(new JButton(new AbstractAction("Add") {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (int i = 0; i < N; i++) {
                    added.add(rand.nextGaussian(), rand.nextGaussian());
                }
            }
        }));
        this.add(control, BorderLayout.SOUTH);
    }

    private ChartPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            title, "X", "Y", createSampleData(),
            PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        xyPlot.setDomainCrosshairVisible(true);
        xyPlot.setRangeCrosshairVisible(true);
        XYItemRenderer renderer = xyPlot.getRenderer();
        renderer.setSeriesPaint(0, Color.blue);
        NumberAxis domain = (NumberAxis) xyPlot.getDomainAxis();
        domain.setVerticalTickLabels(true);
        return new ChartPanel(jfreechart);
    }

    private XYDataset createSampleData() {
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        XYSeries series = new XYSeries("Random");
        for (int i = 0; i < N * N; i++) {
            double x = rand.nextGaussian();
            double y = rand.nextGaussian();
            series.add(x, y);
        }
        xySeriesCollection.addSeries(series);
        xySeriesCollection.addSeries(added);
        return xySeriesCollection;
    }

    public static void main(String args[]) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                ScatterAdd demo = new ScatterAdd(title);
                demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                demo.pack();
                demo.setLocationRelativeTo(null);
                demo.setVisible(true);
            }
        });
    }
}