import java.awt.*;
import java.applet.*;
import java.io.*;
import java.net.*;

public class Filewindow extends Applet implements Runnable{
  /** diplays a window into the given file 
       parameter:fname-file name, speed-how fast to change, font-font type*/
    String filename;
    URL thisurl;
    String s[];
    int current;  // index of line displayed
    int maxlines; 
    Thread windower;
    int speed;
    FontMetrics fm;
    Dimension size;  //height and width


   public void advance() {
        if (current==maxlines)
              current=0;
        else current=current+1;}
 
   public void paint(Graphics g) {   
       g.clearRect(0,0,size.width,size.height);
       g.drawString(s[current],1,10); }

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

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

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

    public boolean mouseDown(Event eve,int x, int y) {
	try {getAppletContext().showDocument(thisurl);}
	  catch  (Exception e) {System.out.println("Sorry, can't find it");}
	return true;
	}


    private int c=' ';  //static function var for readline
    private StringBuffer nextword=new StringBuffer();
    
    private String readline(InputStream f) { //read a line from the stream fitting on our line,  null if end
        if (c<0) return null;
	String line=new String();
        int sizelimit=size.width-10;

	// cut up into lines
	while (c>=0){

             try {c=f.read();}
               catch (IOException e) {
                System.out.println("Read error. :"+(char)c+" "); 
		c=-2; 
		break;}
        //           System.out.print((char)c+" "+c+",");

            if (c=='<') {  //skip blocks of <>  *****warning! can't do single < correctly
              try { while(f.read() !='>'); }
                  catch (IOException e) {System.out.print("skipping <>"); c=-2;} 
	      continue;}

	    if ((c=='\n' || c=='\r') && nextword.length()==0 && line.length()==0) continue; //skip blank lines

            if (c==' ' || c=='\t' || c=='\n' || c=='\r' ) {  //new word
                if (fm.stringWidth(line+nextword.toString()) >=sizelimit)  {//buffer full
                     nextword.append(' '); break;}  //put next word on next line with space 
                line=line+nextword.toString()+" ";
		nextword.setLength(0); 
		if (c=='\n' || c=='\r') break; } //hard line break in file 
            else nextword.append((char)c); } // just new letter
         //current char is whitespace

         if (line.length()>0)  return line;
	 else return null; //error

 
}


    public void init() { 
      InputStream f;
      int i=0;
      String fontname;
      Font font;

      size=size();
      s=new String[300];  //will later declare it after getting file size

      setBackground(new Color(180,180,255));
      filename=getParameter("fname");
      if ((fontname=getParameter("font"))==null)  fontname="TimesRoman";
      font = new Font(fontname, Font.BOLD, size.height-1);
      setFont(font);
      fm=getFontMetrics(font);
      
      String att = getParameter("speed");
      speed = (att == null) ? 5000 : (1000 * Integer.parseInt(att));
      try {thisurl=new URL(getDocumentBase(),filename);
 	f=thisurl.openStream();}
      catch (IOException e) {System.out.println("File not available");return;}
  
	//read in lines from file
	while ((s[i++]=readline(f))!=null)
               if (i>=s.length-2)  {//resize array
		String[] temp=new String[2*s.length];
		System.arraycopy(s,0,temp,0,s.length);
		s=temp;}
		


	maxlines=i-2;
	current=0;
	try {f.close();}  catch (IOException e) {System.out.print("can't close()");}}
}