JFreeChart with highlighted points

问题:

I am using JFreeChart to draw a graph. The code is

package com.daya;  import java.awt.Color; import java.io.BufferedReader; import java.io.DataInputStream; import java.io.FileInputStream; import java.io.InputStreamReader;  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.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities;  public class Two extends ApplicationFrame {      public Two(final String title) {         super(title);         final XYDataset dataset = createDataset();         final JFreeChart chart = createChart(dataset);         final ChartPanel chartPanel = new ChartPanel(chart);         chartPanel.setPreferredSize(new java.awt.Dimension(1200, 1100));         setContentPane(chartPanel);     }      private XYDataset createDataset() {         final XYSeries series1 = new XYSeries("SLMM");         final XYSeries series2 = new XYSeries("FSPM");         XYSeries series = new XYSeries("Power Comparision");         final XYSeriesCollection dataset = new XYSeriesCollection();         try {             FileInputStream fstream = new FileInputStream("d:\\devs\\Result.txt");             DataInputStream in = new DataInputStream(fstream);             BufferedReader br = new BufferedReader(new InputStreamReader(in));             String strLine;             StringBuffer buffer = new StringBuffer();             while ((strLine = br.readLine()) != null) {                 buffer.append(strLine);             }             String message = buffer.toString();             message = message.replaceAll(" ", "");             String[] splitMessage = message.split("&&&");             for (int i = 0; i < splitMessage.length; i++) {                 double x = 0.0, y = 0.0;                 String algType = "direct";                 String[] insideSplit = splitMessage[i].split("\\|\\|");                 if (insideSplit[0].equalsIgnoreCase("isStraightAlg:false")) {                     algType = "indirect";                 }                 for (int j = 1; j < insideSplit.length; j++) {                     String[] valueSplit = insideSplit[j].split("\\:");                     if (valueSplit[0].equalsIgnoreCase("Transactions")) {                         x = Double.parseDouble(valueSplit[1]);                     } else {                         y = Double.parseDouble(valueSplit[1]);                     }                     //System.out.println(valueSplit[1]);                 }                  if (!algType.equalsIgnoreCase("direct")) {                     System.out.println("X :" + x + " Y:" + y);                     series1.add(x, y);                 } else {                     System.out.println("X :" + x + " Y:" + y);                     series2.add(x, y);                 }             }               dataset.addSeries(series1);             dataset.addSeries(series2);         } catch (Exception e) {             e.printStackTrace();         }         return dataset;     }      private JFreeChart createChart(final XYDataset dataset) {         final JFreeChart chart = ChartFactory.createXYLineChart(             "Power Comparison",             "Transaction",             "Energy",             dataset,             PlotOrientation.VERTICAL,             true,             true,             false);         chart.setBackgroundPaint(Color.white);         final XYPlot plot1 = chart.getXYPlot();         plot1.setBackgroundPaint(Color.lightGray);         plot1.setDomainGridlinePaint(Color.white);         plot1.setRangeGridlinePaint(Color.white);          final XYPlot plot2 = chart.getXYPlot();         plot2.setBackgroundPaint(Color.lightGray);         plot2.setDomainGridlinePaint(Color.white);         plot2.setRangeGridlinePaint(Color.white);          return chart;     }      public static void main(final String[] args) {         final Two demo = new Two("Multi Line Chart");         demo.pack();         RefineryUtilities.centerFrameOnScreen(demo);         demo.setVisible(true);     } } 

and the text file is :

isStraightAlg : false || Transactions : 500 || Energy : 74267 &&& isStraightAlg : true || Transactions : 500 || Energy : 55984 &&& isStraightAlg : false || Transactions : 1000 || Energy : 169735 &&& isStraightAlg : true || Transactions : 1000 || Energy : 162520 &&& isStraightAlg : false || Transactions : 1500 || Energy : 333668 &&& isStraightAlg : true || Transactions : 1500 || Energy : 313766 &&& isStraightAlg : false || Transactions : 2000 || Energy : 494159 &&& isStraightAlg : true || Transactions : 2000 || Energy : 481627 &&& isStraightAlg : false || Transactions : 2500 || Energy : 594839 &&& isStraightAlg : true || Transactions : 2500 || Energy : 594839 &&& isStraightAlg : false || Transactions : 3000 || Energy : 847096 &&& isStraightAlg : true || Transactions : 3000 || Energy : 842402 &&&

With the above code the graph is drawn. The graph is shown below. How can I show the exact points for what the graph is drawn, i.e selected xy point has to present with circle?

回答1:

ChartFactory.createXYAreaChart() uses an XYAreaRenderer. The parent AbstractRenderer has methods to change the visibility and appearance of shapes, as shown here for the related XYLineAndShapeRenderer.

Addendum: Your complete example invokes ChartFactory.createXYLineChart(), which uses an XYLineAndShapeRenderer internally. The image below resulted from adding these lines to createChart():

XYLineAndShapeRenderer renderer =     (XYLineAndShapeRenderer) plot1.getRenderer(); renderer.setBaseShapesVisible(true); 

回答2:

plot1.setRangeGridlinePaint(Color.white);  // your existing code java.awt.geom.Ellipse2D.Double shape = new java.awt.geom.Ellipse2D.Double(-2.0, -2.0, 4.0, 4.0); plot1.getRenderer().setBaseShape(shape); // or maybe plot1.getRenderer().setSeriesShape(0, shape); 

文章来源: JFreeChart with highlighted points