import java.awt.*;
import java.lang.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class rwho extends
java.applet.Applet 
implements  Runnable{


  private URL theUrl;
  private URLConnection www;
  private DataInputStream in;
  private Font font;
  private Thread theScroll;
  private int speed;
  private Graphics offGraphics;
  private Dimension offDimension;
  private Image offImage;
  private String toPrint;
  private int x2 = 0,y = 1,total;
  private boolean start = true;

  public void init() {
    String urlString = getParameter("url");
    String temp = getParameter("speed");
    speed = Integer.valueOf(temp).intValue();
    temp = getParameter("size");
    font = new Font("Helvetica",Font.PLAIN,Integer.valueOf(temp).intValue());
    try {
      theUrl = new URL(urlString);
    } catch (MalformedURLException e) {
      System.out.println("Malformed url: "+e);
    }
    toPrint = do_rwho(theUrl);
  }	

  public void start() {
    theScroll = new Thread(this);
    theScroll.start();
  }

  public void stop() {
    theScroll.stop();
  }


  public void run() {
    while (true) {
      try {Thread.currentThread().sleep(speed);} catch 
						   (InterruptedException e){}
      repaint();
    }
  }


  public void paint(Graphics g) {
    if (offImage != null) {
      g.drawImage(offImage, 0, 0, null);
    }
  }

  public void update(Graphics g) {
    Dimension d = size();

    // Create the offscreen graphics context
	 if ((offGraphics == null)
	     || (d.width != offDimension.width)
	     || (d.height != offDimension.height)) {
	   offDimension = d;
	   offImage = createImage(d.width, d.height);
	   offGraphics = offImage.getGraphics();
	 }

    // Erase the previous image
	 offGraphics.setColor(Color.white);
    offGraphics.fillRect(0, 0, d.width, d.height);
    offGraphics.setColor(Color.black);

    // Paint the frame into the image
	 paintFrame(offGraphics);

    // Paint the image onto the screen
	 g.drawImage(offImage, 0, 0, null);
  }


  /*
   * Paint a frame of animation.
   */
  public void paintFrame(Graphics g) {

    Dimension d = size();

    g.setFont(font);
    FontMetrics fm = g.getFontMetrics();
    total = d.height + fm.getHeight();
    StringTokenizer token = new StringTokenizer(toPrint,",");
    y--;
    if (start) {
     y=total;
     x2=0;
     start = false;
    }

    if (y<=0) {
      x2++;
      y=total-d.height;
      if (x2>=token.countTokens()) {
	x2=0;
	toPrint = do_rwho(theUrl);
	token = new StringTokenizer(toPrint,",");
	y=total;
      }
    }
    String trashMe = "";
    for (int i=0;i<x2;i++)
      trashMe = token.nextToken();
    int i = x2;
    while (token.hasMoreTokens()) {
      g.drawString(token.nextToken(),5,(y+fm.getHeight()*(i-x2)));
      i++;
    }
  }

  public String do_rwho(URL url) {

    String ret = "";

    try {
      www = url.openConnection();
    } catch(IOException e) {
      System.out.println("Cant open connection (IO error) "+e);
    }

    try {
      in = new DataInputStream(url.openStream());
    } catch (IOException e) {
      System.out.println("Cant open urlStream (IO error): "+e);
    }
    try {
      String s = in.readLine();
      ret = "";
      while (s != null) {
	if (s == "")
	  ret = s;
	else
	  ret = ret +","+ s;
	s = in.readLine();
      }
    } catch (IOException e) {
      System.out.println("Cant print (IO error): "+e);
    }
    return ret;
  }

}