JfreeChart XYAreaChart draw shape at each point [duplicate] - jfreechart

Question

I am using JFreeChart XYPLot for plotting a XYData set with different labels . I have created different XYSeries objects for different labels so that I can have different colors for different labels . Now I need to require the change the shapes of specific points(test data) in each XYDataSeries as below .
In the above plotting , there are two different XYSeries with blue and red color . Out of these two I need to change the shapes of some points(test data) to X instead of circle . Is it possible in JFreeChart. This post explained on how to do it for whole data set , but I want to change only specific points
Below is the code I have written so far
public static Map<String, XYSeries> createXYSeries(Data[] dataSet){
Map<String,XYSeries> xySeries = new HashMap<String, XYSeries>();
for(Data data : dataSet){
if(xySeries.get(data.actualLabel) == null){
xySeries.put(data.actualLabel, new XYSeries(data.actualLabel));
}
xySeries.get(data.actualLabel).add(data.dimensionValues[0],data.dimensionValues[1]);
}
return xySeries;
}
public XYDataset createXYSeriesCollection(Map<String, XYSeries> plottingDataSet) {
XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
for (String key : plottingDataSet.keySet()) {
xySeriesCollection.addSeries(plottingDataSet.get(key));
}
return xySeriesCollection;
}
private ChartPanel createPlottingPanel(String title,
Map<String, XYSeries> plottingDataSet) {
JFreeChart jfreechart = ChartFactory.createScatterPlot(title, "X", "Y",
createSampleData(plottingDataSet), PlotOrientation.VERTICAL,
true, true, false);
XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
xyPlot.setDomainCrosshairVisible(true);
xyPlot.setRangeCrosshairVisible(true);
xyPlot.setBackgroundPaint(Color.white);
return new ChartPanel(jfreechart);
}
Note : I am trying to plot the KNearestNeighbors results .(Circles for train data and X for test data)

Answer 1

ChartFactory.createScatterPlot() instantiates an XYLineAndShapeRenderer. You can replace the renderer with one that lets you selectively replace the Shape returned by getItemShape(), as shown below.
xyPlot.setRenderer(new XYLineAndShapeRenderer(false, true) {
#Override
public Shape getItemShape(int row, int col) {
if (row == 0 & col == N) {
return ShapeUtilities.createDiagonalCross(5, 2);
} else {
return super.getItemShape(row, col);
}
}
});
Complete example, as run:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Shape;
import java.util.*;
import javax.swing.JFrame;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTickUnit;
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.util.ShapeUtilities;
/**
* #see http://stackoverflow.com/a/20359200/230513
* #see http://stackoverflow.com/a/6669529/230513
*/
public class ScatterShape extends JFrame {
private static final int N = 8;
private static final int SIZE = 345;
private static final String title = "Scatter Shape Demo";
private static final Random rand = new Random();
private final XYSeries series = new XYSeries("Data");
public ScatterShape(String s) {
super(s);
final ChartPanel chartPanel = createDemoPanel();
this.add(chartPanel, BorderLayout.CENTER);
}
private ChartPanel createDemoPanel() {
JFreeChart chart = ChartFactory.createScatterPlot(
title, "X", "Y", createSampleData(),
PlotOrientation.VERTICAL, true, true, false);
XYPlot xyPlot = (XYPlot) chart.getPlot();
xyPlot.setDomainCrosshairVisible(true);
xyPlot.setRangeCrosshairVisible(true);
xyPlot.setRenderer(new XYLineAndShapeRenderer(false, true) {
#Override
public Shape getItemShape(int row, int col) {
if (row == 0 & col == N) {
return ShapeUtilities.createDiagonalCross(5, 2);
} else {
return super.getItemShape(row, col);
}
}
});
adjustAxis((NumberAxis) xyPlot.getDomainAxis(), true);
adjustAxis((NumberAxis) xyPlot.getRangeAxis(), false);
xyPlot.setBackgroundPaint(Color.white);
return new ChartPanel(chart) {
#Override
public Dimension getPreferredSize() {
return new Dimension(SIZE, SIZE);
}
};
}
private void adjustAxis(NumberAxis axis, boolean vertical) {
axis.setRange(-3.0, 3.0);
axis.setTickUnit(new NumberTickUnit(0.5));
axis.setVerticalTickLabels(vertical);
}
private XYDataset createSampleData() {
XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
for (int i = 0; i < N * N; i++) {
series.add(rand.nextGaussian(), rand.nextGaussian());
}
xySeriesCollection.addSeries(series);
return xySeriesCollection;
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
ScatterShape demo = new ScatterShape(title);
demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
demo.pack();
demo.setLocationRelativeTo(null);
demo.setVisible(true);
}
});
}
}