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如何在JFreeChart散点图中创建空心形状

jfreechartmarkerscatter
4

JFreeChart 版本使用：1.5.0

我尝试了以下方法来在散点图中获取空心形状：

PlotFrame.java 文件内容：

package javaapplication1;


import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
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;

/**
 *
 * @author tarik
 */
public class PlotFrame extends javax.swing.JFrame {    
    public static void main(String[] argv) {
        PlotFrame plotFrame = new PlotFrame();
        plotFrame.setVisible(true);
    }


    /**
     * Creates new form PlotFrame
     */
    public PlotFrame() {    
        this.setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JFreeChart chart = createChart();    
        ChartPanel panel = new ChartPanel(chart);

        this.add(panel);
        pack();
    }

    private JFreeChart createChart() {
        // Create dataset  
        XYDataset dataset = createDataset();

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

        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) chart.getXYPlot().getRenderer();
        //renderer.setBaseShapesFilled(false); 
        renderer.setUseFillPaint(false);

        return chart;
    }

    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;
    }
}

它不起作用了，形状仍然被填充。
2个回答
4
请注意，Graphics2D 可以用 draw() 方法绘制 Shape 的轮廓线并填充其内部。通过限制渲染为 draw(), 在这方面 @micro 的 方法 是正确的，但它假定使用版本 1.0.19。当迁移到1.5及更高版本时，请注意，“许多方法 getBaseXXX()/setBaseXXX() 已经被重命名为 setDefaultXXX()/getDefaultXXX()。” 正确的公式如下所示：
renderer.setDefaultShapesFilled(false); 
renderer.setUseFillPaint(false);

图片

其他改变：

测试结果如下：

import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
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;

/**
 * @see https://dev59.com/Crfna4cB1Zd3GeqPsm85
 * @author trashgod
 * @author tarik
 */
public class PlotFrame extends javax.swing.JFrame {    
    public static void main(String[] argv) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                PlotFrame plotFrame = new PlotFrame();
                plotFrame.setLocationRelativeTo(null);
                plotFrame.setVisible(true);
            }
        });
    }

    /**
     * Creates new form PlotFrame
     */
    public PlotFrame() {    
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JFreeChart chart = createChart();    
        ChartPanel panel = new ChartPanel(chart){
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(640, 480);
            }
        };
        this.add(panel);
        this.pack();
    }

    private JFreeChart createChart() {
        // Create dataset  
        XYDataset dataset = createDataset();

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

        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) chart.getXYPlot().getRenderer();
        renderer.setDefaultShapesFilled(false); 
        renderer.setUseFillPaint(false);

        return chart;
    }

    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;
    }
}
3

从源代码：

 if (getItemShapeFilled(series, item)) {
                if (this.useFillPaint) {
                    g2.setPaint(getItemFillPaint(series, item));
                }
                else {
                    g2.setPaint(getItemPaint(series, item));
                }
                g2.fill(shape);
   }

对于第一个 if 语句，由于没有 else 分支，因此我们需要确保 getItemShapeFilled 返回 false。代码如下：

      public boolean getItemShapeFilled(int series, int item) {
            Boolean flag = getSeriesShapesFilled(series);
            if (flag != null) {
                return flag;
            }
            return this.baseShapesFilled;
      }

最简便的方法是使用以下方式：
       public void setBaseShapesFilled(boolean flag) {
              this.baseShapesFilled = flag;
              fireChangeEvent();
        }

因此，实际代码是：

import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
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;

/**
 *
 * @author tarik
 */
public class PlotFrame extends javax.swing.JFrame {    
    public static void main(String[] argv) {
        PlotFrame plotFrame = new PlotFrame();
        plotFrame.setVisible(true);
    }


    /**
     * Creates new form PlotFrame
     */
    public PlotFrame() {    
        this.setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JFreeChart chart = createChart();    
        ChartPanel panel = new ChartPanel(chart);

        this.add(panel);
        pack();
    }

    private JFreeChart createChart() {
        // Create dataset  
        XYDataset dataset = createDataset();

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

        XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) chart.getXYPlot().getRenderer();
        renderer.setBaseShapesFilled(false); 
        renderer.setUseFillPaint(false);

        return chart;
    }

    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;
    }
}

我的结果是：

在此输入图片描述

这难道不是你意思吗？

回到工作时会尝试这个，如果有效的话一定会标记您的答案为被接受的。 - Tarik
好的，我尝试了你的解决方案，但它没有起作用。出现了“找不到符号”的错误。请查看更新的问题，其中包括完整的代码。 - Tarik
我在这里详细阐述了差异（链接：https://dev59.com/Crfna4cB1Zd3GeqPsm85#58887924）。由于我的答案仅仅是解释性的，请不要犹豫，将赏金颁发给@micro。 - trashgod
renderer.setBaseShapesFilled(false); 我得到了“符号未找到”的错误。我正在使用JFreeChart 1.5版本。 - Tarik
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