如何在 JFreechart 中获取点的菱形形状

我需要在 JFreechart 中的时间序列上获得 A 菱形形状，但我无法做到这一点。有人可以指导应该在下面的代码中添加哪些代码来实现钻石形状点以及如何更改线条的颜色吗？

（该程序使用 rs 和 stmt 以及其他从数据库派生并在其他地方定义的东西。该程序现在工作正常，唯一的问题是它看起来超级无聊。）

TimeSeries s1 = new TimeSeries("Technology", Day.class);
TimeSeries s2 = new TimeSeries("Entertainment", Day.class);
TimeSeries s3 = new TimeSeries("Soap", Day.class);
TimeSeries s4 = new TimeSeries("Music", Day.class);
TimeSeries s5 = new TimeSeries("Native", Day.class);
TimeSeries s6 = new TimeSeries("Speciality", Day.class);
TimeSeries s7 = new TimeSeries("Science", Day.class);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date plotdate;


if (!(combo_individualid.getModel().getSize() == 0)) {
    String sql = ""
            + "SELECT * "
            + "FROM   `customerbasetag` "
            + "WHERE  `individual_idindividual` =? ";

    try {
        stmt = conn.prepareStatement(sql);
        stmt.setString(1, combo_individualid.getSelectedItem().toString());
        rs = stmt.executeQuery();

        while (rs.next()) {

            try {
                plotdate = sdf.parse(rs.getString("session_date"));

                s1.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("technology"))));
                s2.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("entertainment"))));
                s3.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("soap"))));
                s4.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("music"))));
                s5.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("native"))));
                s6.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("speciality"))));
                s7.add(new Day(plotdate), new Integer(Integer.parseInt(rs.getString("science"))));


            } catch (ParseException ex) {
                JOptionPane.showMessageDialog(null,
                    "Parse Exception" + ex.getMessage());
            }
        }
    } catch (SQLException ex) {
        JOptionPane.showMessageDialog(null,
            "Error During Session Select" + ex.getMessage());
    }


    /*NOTE: Chart plotting here*/
    TimeSeriesCollection dataset = new TimeSeriesCollection();
    dataset.addSeries(s1);
    dataset.addSeries(s2);
    dataset.addSeries(s3);
    dataset.addSeries(s4);
    dataset.addSeries(s5);
    dataset.addSeries(s6);
    dataset.addSeries(s7);
    JFreeChart chart = ChartFactory.createTimeSeriesChart(
        "TS Chart", "Date", "Value", dataset, true, true, false);

    XYPlot plot = (XYPlot) chart.getPlot();
    plot.setBackgroundPaint(Color.lightGray);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);
    plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
    plot.setDomainCrosshairVisible(true);
    plot.setRangeCrosshairVisible(true);

    ChartFrame f = new ChartFrame("Individual Choice Evaluation", chart);
    f.setVisible(true);
    f.setSize(800, 600);
    f.setLocationRelativeTo(null);

} else {

    JOptionPane.showMessageDialog(null, "Please Select an Individual");
}

我已经更新了代码，但它仍然无法正常工作，并且我不断取回旧图表。这是代码。

TimeSeriesCollection dataset = new TimeSeriesCollection();
            dataset.addSeries(s1);
            dataset.addSeries(s2);
            dataset.addSeries(s3);
            dataset.addSeries(s4);
            dataset.addSeries(s5);
            dataset.addSeries(s6);
            dataset.addSeries(s7);
            JFreeChart chart = ChartFactory.createTimeSeriesChart("Time Series Chart for Individual id: "+combo_individualid.getSelectedItem().toString() , "Date", "Value", dataset, true, true, false);



            Shape theShape = ShapeUtilities.createDiamond(1);


            XYPlot plot = (XYPlot) chart.getPlot();
            plot.setBackgroundPaint(Color.lightGray);
            plot.setDomainGridlinePaint(Color.white);
            plot.setRangeGridlinePaint(Color.white);
            plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
            plot.setDomainCrosshairVisible(true);
            plot.setRangeCrosshairVisible(true);



            XYItemRenderer renderer = plot.getRenderer();

            renderer.setSeriesShape(0, theShape);
            renderer.setSeriesShape(1, theShape);
            renderer.setSeriesShape(2, theShape);
            renderer.setSeriesShape(3, theShape);
            renderer.setSeriesShape(4, theShape);
            renderer.setSeriesShape(5, theShape);
            renderer.setSeriesShape(6, theShape);





            ChartFrame f = new ChartFrame("Individual Choice Evaluation", chart);
            f.setVisible(true);
            f.setSize(800, 600);
            f.setLocationRelativeTo(null);

ShapeUtilities.createDiamond()可以打造钻石形状；你可以像这样应用它example不同的Shape.

附录：默认情况下，createTimeSeriesChart()创建一个XYLineAndShapeRenderer您可以如下所示进行修改here.

XYPlot plot = (XYPlot) chart.getPlot();
XYLineAndShapeRenderer r = (XYLineAndShapeRenderer) plot.getRenderer();
r.setSeriesShape(0, ShapeUtilities.createDiamond(5));
r.setSeriesShapesVisible(0, true);

SSCCE:

import java.awt.Dimension;
import java.util.Random;
import javax.swing.JFrame;
import org.jfree.chart.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.util.ShapeUtilities;

/** @see https://stackoverflow.com/a/14822991/230513 */
public class Test {

    private static final int N = 16;
    private static final Random random = new Random();

    private static XYDataset createDataset() {

        final TimeSeries series = new TimeSeries("Data");
        Day current = new Day();
        for (int i = 0; i < N; i++) {
            series.add(current, Math.abs(random.nextGaussian()));
            current = (Day) current.next();
        }
        return new TimeSeriesCollection(series);
    }

    private static JFreeChart createChart(final XYDataset dataset) {
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            "Test", "Day", "Value", dataset, false, false, false);
        XYPlot plot = (XYPlot) chart.getPlot();
        XYLineAndShapeRenderer r = (XYLineAndShapeRenderer) plot.getRenderer();
        r.setSeriesShape(0, ShapeUtilities.createDiamond(5));
        r.setSeriesShapesVisible(0, true);
        return chart;
    }

    public static void main(String[] args) {

        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        XYDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart) {

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(630, 480);
            }
        };
        f.add(chartPanel);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}