java JFreeChart散点图线

Question

我正在尝试使用JFreeChart创建一个图形，但是它没有得到正确的线条。它不是按我放置的顺序连接点，而是按x值的顺序连接点。我正在使用ChartFactory。createScatterPlot创建绘图，XylineandShaperEnder设置线条可见

/编辑：sscce:

package test;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;

public class PlotTest {
    private XYSeriesCollection dataset;

    public static void main (String[] args) {
        new PlotTest();
    }

    public PlotTest () {
        dataset = new XYSeriesCollection();
        XYSeries data = new XYSeries("data");
        data.add(3, 2); //Point 1
        data.add(1, 1); //Point 2
        data.add(4, 1); //Point 3
        data.add(2, 2); //Point 4
        dataset.addSeries(data);
        showGraph();
    }

    private void showGraph() {
        final JFreeChart chart = createChart(dataset);
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        final ApplicationFrame frame = new ApplicationFrame("Title");
        frame.setContentPane(chartPanel);
        frame.pack();
        frame.setVisible(true);
    }

    private JFreeChart createChart(final XYDataset dataset) {
        final JFreeChart chart = ChartFactory.createScatterPlot(
            "Title",                  // chart title
            "X",                      // x axis label
            "Y",                      // y axis label
            dataset,                  // data
            PlotOrientation.VERTICAL,
            true,                     // include legend
            true,                     // tooltips
            false                     // urls
        );
        XYPlot plot = (XYPlot) chart.getPlot();
        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
        renderer.setSeriesLinesVisible(0, true);
        plot.setRenderer(renderer);
        return chart;
    }

}

现在我希望程序按照1-2-3-4的顺序连接点，这是我将它们添加到数据集中的顺序。但我确实让它们按2-4-1-3的顺序连接，按x值排序

Answer 1

试试这个：

 final XYSeries data = new XYSeries("data",false);

将此构造函数用于XYSeries将禁用自动排序，如XYSeries API中定义的那样

之前：

之后：

Answer 2

缺少sscce很难说，但是您可以尝试从XYDataset的实现返回DomainOrder.NONE。此外，它可能有助于了解散点图中连接点的线的含义