//    CHAPTER　9
//    Applet Source Name [StringSway.java]
//                                    1996.2
//                 Author [ Junzo hagimoto ]
import java.applet.*;
import java.awt.*;

public  class  StringSway  extends Applet implements Runnable {
    Dimension d;
    String s[];                                                     
    Thread kicker = null;
    int    xScroll;                           
    Font   font;                                        
    int    strHeight,strWidth;                          
    int    maxText;                                                 
    int    curTextCount=0 ;                                         
    int    red,blue,green;                                          
    Color  color;                                                   
    int    speed;                                                  
    Image  offs;                                                   
    Graphics grf;                                        // 
    char separated[];                                    // ADD
    int    charWidth;                                    // ADD 
    

    public void init() {
        d = size();
       xScroll = d.width;                    

       offs = createImage( d.width, d.height);                     
       grf  = offs.getGraphics();                                  


        String param = getParameter( "speed" );                    
        speed = (param != null) ? Integer.parseInt(param) : 1;     
        if(speed < 1 ||  speed > 5 ){                               
            speed = 1;                                            
        }                                                          
       
        param = getParameter( "maxText" );                   
        maxText = (param != null) ? Integer.parseInt(param) : 1;    
        s = new String[maxText];                                    
        int i=0;                                                    
        do{                                                         
            param = getParameter( "text"+ (i+1) );                  
            if(param != null ){                                     
            s[i] = new String(param);                           
        }else{                                                  
                if( i==0 ){                                         
                   s[i] = "Java";                                    
                }                                                   
            maxText = i+1;                                      
            }                                                       
        }while( param != null && ++i != maxText );                  

        font  = new Font("TimesRoman",Font.BOLD,20);           
        strHeight  =(getFontMetrics(font)).getLeading() ;      
        strHeight -=(getFontMetrics(font)).getDescent() ;      
        strHeight +=(getFontMetrics(font)).getAscent() ;       
    }


    public void run() {
        Thread.currentThread().setPriority(Thread.NORM_PRIORITY-3);
        while (kicker != null) {
            repaint();
            try {
                Thread.sleep( 20 );                         
            } catch (InterruptedException e) {}
         }
         kicker=null;
    }

    public void update(Graphics g) {                        
           paint(g);                                        
    }                                                       
    public void paint(Graphics g) {
        grf.setFont( font );                                  
        grf.setColor(Color.black);                                   
        grf.fillRect(0, 0, d.width, d.height);
        if(xScroll == d.width){                                       
            red   = (int)(Math.random() * 256);                       
            blue  = (int)(Math.random() * 256);                       
            green = (int)(Math.random() * 256);                       
            color = new     Color( red, green, blue);                 
            curTextCount++;                                           
            if(curTextCount > maxText){                               
               curTextCount=1;                                     
            }                                                         

           strWidth = (getFontMetrics(font)).stringWidth(s[curTextCount-1]);
                                                                  // 
            separated =  new char [ s[curTextCount-1].length() ]; // ADD
            s[curTextCount-1].getChars(0,                         // ADD
                      s[curTextCount-1].length(),separated,0);    // ADD 

        }                                                             
        grf.setColor(color);
       xScroll -= speed;
                                                                        // 
        int _xOffset=0;                                                 // ADD
        for(int i=0;i < s[curTextCount-1].length();i++){                // ADD>
             int _y= (int) (Math.random()* 5);                          // ADD
             int _x= (int) (Math.random()* 5);                          // ADD
             _xOffset += (i != 0)?                                      // ADD
                 (getFontMetrics(font)).charWidth(separated[i-1]) : 0;  // ADD
             grf.drawChars(separated, i,1 ,xScroll + _x + _xOffset,     // ADD
                     d.height/2 +strHeight/2 + _y );                    // ADD 
        }
                                                                        
//  DEL      grf.drawString(s[curTextCount-1],
//  DEL              xScroll,d.height/2 +strHeight/2 );                   

        if(xScroll < -strWidth ){                           
           xScroll = d.width;                 
        }
                                      
        g.drawImage(offs, 0, 0, this);                               
    }

    public void start() {
           if (kicker == null) {
               kicker = new Thread(this);
               kicker.start();
           }
    }

    public void stop() {
         if (kicker != null) {
            kicker.stop();
            kicker = null;
         }
    }
}
              //