import java.awt.*;
import java.applet.*;
import java.util.Vector;

public class Histogram extends Applet 
{
  private int WIDTH, HEIGHT; 
  private Image offScreenImage;
  private Graphics offScreenGraphics;
  
  public void init()
  {
    Dimension dim = getSize();
    WIDTH = dim.width;
    HEIGHT = dim.height;
  }
  
  private Vector Vectorize(String str)
  {
    Vector items = new Vector();

    while (str.length() > 0) {
      int index = 0;
      while (index < str.length() && 
   	     Character.isWhitespace(str.charAt(index))) {
        index++;  
      }

      if (index < str.length()) {
        String item = "";
        while (index < str.length() && 
	       !Character.isWhitespace(str.charAt(index))) {
          item += str.charAt(index);
          index++;
        }
        items.addElement(item);
      }
    
      if (index < str.length()) {
        str = str.substring(index+1, str.length());
      }
      else {
        str = "";
      }
    }
    return items;  
  }
  
  public void drawHistogram(String dataString)
  {
    Vector data = Vectorize(dataString);

	offScreenImage = createImage(WIDTH, HEIGHT);
    offScreenGraphics = offScreenImage.getGraphics();
    for (int i = 0; i < data.size(); i+=2) {
	  int size = Integer.parseInt((String)data.elementAt(i+1));
      offScreenGraphics.setColor(Color.yellow);
	  offScreenGraphics.fillRect(0, 40*i/2, size, 40);
      offScreenGraphics.setColor(Color.black);
	  offScreenGraphics.drawRect(0, 40*i/2, size, 40);
      offScreenGraphics.drawString(data.elementAt(i)+
				   "  ("+ size +")",
				   10, (i/2)*40+25);
    }

    paint(getGraphics());
  }
  
  public void paint(Graphics g)
  {
      g.drawImage(offScreenImage, 0, 0, null);
  }
}