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

package games.league;

import java.awt.Color;
import java.io.FileOutputStream;
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 WPCVisualizerPDF {

        public static void main(String[] args) {
                Document document = new Document(PageSize.A4);

                try {
                        PdfWriter.getInstance(document, new FileOutputStream("WPC.pdf"));
                        document.open();

                        PdfPTable table = new PdfPTable(8);
                        Scanner sc = new Scanner(System.in);
                        double sum = 0;
                        for (int i = 0; i < 64; i++) {
                                float w = (float)sc.nextDouble();
                                sum += w;
                                System.out.println(w);
                                PdfPCell cell = new PdfPCell(new Paragraph(" "));
                                cell.setPadding(20.0f);
                                cell.setBorder(Rectangle.NO_BORDER);
                                if (w >= 0) {
                                        cell.setBackgroundColor(new Color(0, Math.min(1, w), 0));                                       
                                } else {
                                        cell.setBackgroundColor(new Color(Math.min(1, Math.abs(w)), 0, 0));
                                }

                                table.addCell(cell);
                        }
                        
                        System.err.println(sum / 64);
                        document.add(table);
                } catch (Exception de) {
                        de.printStackTrace();
                }
                document.close();
        }
}