import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.io.FileInputStream;
import java.util.Scanner;
import java.util.StringTokenizer;

/** Map.java - Using the input text file tract.txt, create an image showing
 *  the basic geographical distribution of population among the 48
 *  contiguous states.  But there is a mistake.  Can you help me?  :)
 */
public class Map
{
  public static void main(String [] args) throws FileNotFoundException
  {
    Scanner in = new Scanner(new FileInputStream("tract.txt"));
    
    // Let's assume that the longitudes range from 65000 to 125000
    // and the latitudes range from 24000 to 50000.
    // Let's divide by 10, and that number will give us a pixel number.
    
    BufferedImage image = new BufferedImage(6000, 2600, 1);
    int blackNumber =   0*65536 +   0*256 + 0;
    int whiteNumber = 255*65536 + 255*256 + 255;
    
    // Begin with white image, and paint black for inhabited pixels.
    for (int x = 0; x < 6000; ++x)
      for (int y = 0; y < 2600; ++y)
        image.setRGB(x, y, whiteNumber);
    
    while (in.hasNextLine())
    {
      String line = in.nextLine();
      StringTokenizer tok = new StringTokenizer(line, "\t ");
      int lat = Integer.parseInt(tok.nextToken());
      int lon = Integer.parseInt(tok.nextToken());
      
      int x = lon / 10 - 6500;
      int y = lat / 10 - 2400;
      System.out.printf("%d %d %d %d\n", lat, lon, x, y);
      
      image.setRGB(x, y, blackNumber);
    }
    in.close();
    
    // Finish the image.
    try
    {
      ImageIO.write(image, "png", new File("usa.png"));
    }
    catch (IOException e)
    {
      System.out.printf("Encountered problem trying to write to file\n");
    }
  }
}