source: java/ecj/games/league/WPCSequenceVisualizer.java

package games.league;

import java.awt.Color;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.util.Arrays;
import java.util.Scanner;

import com.lowagie.text.Document;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;

public class WPCSequenceVisualizer {

        public WPCSequenceVisualizer() {
                
        }
        
        private PdfPTable createTable(double[] wpc) {
                System.err.println(Arrays.toString(wpc));

                PdfPTable table = new PdfPTable(8);
                for (int i = 0; i < 64; i++) {
                        PdfPCell cell = new PdfPCell(new Paragraph(" "));
                        cell.setBorder(Rectangle.NO_BORDER);
                        cell.setPadding(0.4f);
                        if (wpc[i] >= 0) {
                                cell.setBackgroundColor(new Color(0, Math.min(1, (float)wpc[i]), 0));                                   
                        } else {
                                cell.setBackgroundColor(new Color(Math.min(1, Math.abs((float)wpc[i])), 0, 0));
                        }
                        table.addCell(cell);
                }
                
                return table;
        }
        
        public void visualize(String fileIn, String fileOut, int limit, int frequency) {
                Document document = new Document(PageSize.A4, 0, 0, 0, 0);
                document.setMarginMirroring(true);

                try {
                        PdfWriter.getInstance(document, new FileOutputStream(fileOut));
                        document.open();
                        
                        
                        PdfPTable table = new PdfPTable(4);
                        Scanner sc = new Scanner(new FileReader(fileIn));
                        for (int gen = 0; gen <= limit; gen++) {
                                for (int i = 0; i < 8; i++) {
                                        sc.next();
                                }
                                
                                double[] wpc = new double[64];
                                for (int i = 0; i < 64; i++) {
                                        wpc[i] = sc.nextDouble();
                                }
                                
                                if ((gen % frequency) == 0) {
                                        PdfPCell cell = new PdfPCell(createTable(wpc));
                                        cell.setBorder(Rectangle.NO_BORDER);
                                        cell.setPadding(8.0f);
                                        table.addCell(cell);
                                }
                        }
                        
                        table.setComplete(true);
                        table.setWidthPercentage(85);
                        document.add(table);
                        
                } catch (Exception e) {
                        e.printStackTrace();
                } 
                
                document.close();
        }
        
        public static void main(String[] args) {
                WPCSequenceVisualizer vis = new WPCSequenceVisualizer();
                vis.visualize("out.stat", "out.pdf", 840, 30);
        }
}