JFreeChart-散点图 JFreeChart-散点图|JFreeChart

本文概述

散点图示例
ScatterPlotExample.java

散点图或散点图包含一组在水平和垂直轴上绘制的数据点。它显示来自XYDataset的数据。
下图显示了JFreeChart库中包含的Scatter图表的一些演示版本：
【JFreeChart-散点图】散点图演示1：

文章图片
散点图演示2：

文章图片
散点图演示3：

文章图片
散点图示例让我们考虑以下散点图的示例数据。

Boys (Series 1)	Girls (Series 2)
Age	Weight	Age	Weight
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

以下代码根据上述示例数据创建散点图：
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 datasetXYDataset dataset = createDataset(); // Create chartJFreeChart chart = ChartFactory.createScatterPlot("Boys VS Girls weight comparison chart", "X-Axis", "Y-Axis", dataset); //Changes background colorXYPlot plot = (XYPlot)chart.getPlot(); plot.setBackgroundPaint(new Color(255, 228, 196)); // Create PanelChartPanel panel = new ChartPanel(chart); setContentPane(panel); }private XYDataset createDataset() {XYSeriesCollection dataset = new XYSeriesCollection(); //Boys (Age, weight) seriesXYSeries 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) seriesXYSeries 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：