JFreeChart- 散点图

2024 年 8 月 29 日 | 阅读 2 分钟

散点图或散点图包含一组绘制在水平和垂直轴上的数据点。它显示来自 XYDataset 的数据。

以下图像显示了 JFreeChart 库中包含的散点图的一些演示版本

散点图演示 1

散点图演示 2

散点图演示 3

散点图示例

让我们考虑以下散点图的示例数据。

男孩 (系列 1)		女孩 (系列 2)
年龄	权重	年龄	权重
1	72.9	1	72.5
2	81.6	2	80.1
3	88.9	3	87.2
4	96	4	94.5
5	102.1	5	101.4
6	108.5	6	107.4
7	113.9	7	112.8
8	119.3	8	118.2
9	123.8	9	122.9
10	124.4	10	123.4

以下代码从上述示例数据创建一个散点图

ScatterPlotExample.java

import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class ScatterPlotExample extends JFrame {
  private static final long serialVersionUID = 6294689542092367723L;

  public ScatterPlotExample(String title) {
    super(title);

    // Create dataset
    XYDataset dataset = createDataset();

    // Create chart
    JFreeChart chart = ChartFactory.createScatterPlot(
        "Boys VS Girls weight comparison chart", 
        "X-Axis", "Y-Axis", dataset);

    
    //Changes background color
    XYPlot plot = (XYPlot)chart.getPlot();
    plot.setBackgroundPaint(new Color(255,228,196));
    
   
    // Create Panel
    ChartPanel panel = new ChartPanel(chart);
    setContentPane(panel);
  }

  private XYDataset createDataset() {
    XYSeriesCollection dataset = new XYSeriesCollection();

    //Boys (Age,weight) series
    XYSeries series1 = new XYSeries("Boys");
    series1.add(1, 72.9);
    series1.add(2, 81.6);
    series1.add(3, 88.9);
    series1.add(4, 96);
    series1.add(5, 102.1);
    series1.add(6, 108.5);
    series1.add(7, 113.9);
    series1.add(8, 119.3);
    series1.add(9, 123.8);
    series1.add(10, 124.4);

    dataset.addSeries(series1);
    
   //Girls (Age,weight) series
    XYSeries series2 = new XYSeries("Girls");
    series2.add(1, 72.5);
    series2.add(2, 80.1);
    series2.add(3, 87.2);
    series2.add(4, 94.5);
    series2.add(5, 101.4);
    series2.add(6, 107.4);
    series2.add(7, 112.8);
    series2.add(8, 118.2);
    series2.add(9, 122.9);
    series2.add(10, 123.4);

    dataset.addSeries(series2);

    return dataset;
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
      ScatterPlotExample example = new ScatterPlotExample("Scatter Chart Example");
      example.setSize(800, 400);
      example.setLocationRelativeTo(null);
      example.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      example.setVisible(true);
    });
  }
}

输出