Setting Different Color to particular Row in Series-JFreeChart

I have array of elements and they belong to one Series,with these elements I calculated Centroids. Problem is when I display them with "ScatterPlot" I need to show "Array Elements" with "One Color" and the Centroid of these points in "Different Color".

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;

public class Scatteradd extends JFrame {

    int i, x = 0, n1 = 0;

    public Scatteradd(String title, final double[][] samples) {
        super(title);

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final DefaultXYDataset dataset = new DefaultXYDataset();
        dataset.addSeries("Series0", createSeries(0, samples));
        //dataset.addSeries("Series1", createSeries(1,trainingset3));
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(640, 480));
        this.add(chartPanel, BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel();
        JButton addButton = new JButton("Add Series");

        buttonPanel.add(addButton);
        addButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount();
                System.out.println("N-SIZE" + n);
                dataset.addSeries("Series" + n, createSeries(n, samples));
                System.exit(1);
            }
        });
        JButton remButton = new JButton("Remove Series");
        buttonPanel.add(remButton);
        remButton.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount() - 1;
                dataset.removeSeries("Series" + n);
            }
        });
        this.add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
     * Create a series
     * @param samples 
     * 
     * @ return the series
     */
    private double[][] createSeries(int mean, double[][] samples) {

        double[][] series = new double[2][samples.length + 1];

        System.out.println("SSSKSKSValue" + series.length);
        double p = 0, q = 0;
        for (i = 0; i < samples.length; i++) {

            series[0][i] = samples[i][0];
            p = p + samples[i][0];
            series[1][i] = samples[i][1];
            q = q + samples[i][1];
            //System.out.println("Series Values"+series[0][i]+","+series[1][i]);
        }


        series[0][samples.length] = p / samples.length;//Centroid Calculation
        series[1][samples.length] = q / samples.length;//Centroid Calculation
        //Printing All Points in Series Array and the Last Row is the开发者_JAVA百科 Centroid Values
        //which I want display in different Color on Scatter Plot
        for (int v = 0; v < series[0].length; v++) {
            System.out.println("Series Values" + series[0][v] + "," + series[1][v]);
        }

        return series;

    }

    private JFreeChart createChart(XYDataset dataset) {

        // create the chart...
        JFreeChart chart = ChartFactory.createScatterPlot(
            "Scatter Plot Demo", "X", "Y", dataset,
            PlotOrientation.VERTICAL, true, true, false);

        // set chart background
        chart.setBackgroundPaint(Color.white);

        // set a few custom plot features
        XYPlot plot = (XYPlot) chart.getPlot();
        Shape[] cross = DefaultDrawingSupplier.createStandardSeriesShapes();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);
        XYItemRenderer renderer = (XYItemRenderer) plot.getRenderer();
        renderer.setSeriesShape(0, cross[0]);
        plot.setRenderer(renderer);

        return chart;
    }

    /** Main method **/
    public static void main(String[] args) {

        double[][] trainingset3 = {
            {0.428053, 0.409742,},
            {0.415487, 0.401414,},
            {0.404834, 0.400493,},};
        Scatteradd demo = new Scatteradd("JFreeChartDemo", trainingset3);

        demo.pack();
        demo.setLocationRelativeTo(null);
        demo.setVisible(true);

    }
}

SSSKSKSValue2
Series Values0.428053,0.409742
Series Values0.415487,0.401414
Series Values0.404834,0.400493
Series Values0.4161246666666667,0.403883
//Centroids of above 3 Rows

Is there any method to show particular row in a series with different Color,Any example provided regarding this would be great and helpful. Thanks

You can override getItemPaint in the scatter plot's XYLineAndShapeRenderer and choose your color based on any desired combination of row and col. There's a related example here, although it's for a different renderer.

Addendum: The general idea appears in MyRenderer, which extends XYLineAndShapeRenderer.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Paint;
import java.awt.Shape;
import java.util.Arrays;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.DefaultDrawingSupplier;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;

public class ScatterColors extends JFrame {

    private static final Color centroidColor = Color.blue;
    private int centroidColumn;

    public ScatterColors(String title, final double[][] samples) {
        super(title);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        DefaultXYDataset dataset = new DefaultXYDataset();
        dataset.addSeries("Series", createSeries(0, samples));
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(500, 400));
        this.add(chartPanel, BorderLayout.CENTER);
    }

    private double[][] createSeries(int mean, double[][] samples) {
        centroidColumn = samples.length;
        double[][] series = new double[2][samples.length + 1];
        double p = 0, q = 0;
        for (int i = 0; i < samples.length; i++) {
            series[0][i] = samples[i][0];
            p = p + samples[i][0];
            series[1][i] = samples[i][1];
            q = q + samples[i][1];
        }
        series[0][samples.length] = p / samples.length;
        series[1][samples.length] = q / samples.length;
        for (int i = 0; i < series.length; i++) {
            System.out.println(Arrays.toString(series[i]));
        }
        return series;
    }

    private JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createScatterPlot(
            "Scatter Plot Demo", "X", "Y", dataset,
            PlotOrientation.VERTICAL, true, true, false);
        chart.setBackgroundPaint(Color.white);
        XYPlot plot = (XYPlot) chart.getPlot();
        Shape[] cross = DefaultDrawingSupplier.createStandardSeriesShapes();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);
        MyRenderer renderer = new MyRenderer(false, true);
        plot.setRenderer(renderer);
        renderer.setSeriesShape(0, cross[0]);
        plot.setRenderer(renderer);
        return chart;
    }

    private class MyRenderer extends XYLineAndShapeRenderer {

        public MyRenderer(boolean lines, boolean shapes) {
            super(lines, shapes);
        }

        @Override
        public Paint getItemPaint(int row, int col) {
            if (col == centroidColumn) {
                return centroidColor;
            } else {
                return super.getItemPaint(row, col);
            }
        }
    }

    public static void main(String[] args) {
        double[][] trainingSet = {
            {0.428053, 0.409742,},
            {0.415487, 0.401414,},
            {0.404834, 0.400493,},
        };
        ScatterColors demo = new ScatterColors("JFreeChartDemo", trainingSet);
        demo.pack();
        demo.setLocationRelativeTo(null);
        demo.setVisible(true);
    }
}