//cd c:\HPBasic\Toppage-sample3\MySwing\Slideshow100
//set CLASSPATH=.	
//javac Slideshow500.java
//appletviewer Slideshow500.html
//appletviewer Slideshow500.java

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;

/*
    <applet code="Slideshow500.class" width=700 height=600></applet>
*/

public class Slideshow500 extends JApplet implements ActionListener, Runnable {
   Container contentPane;
   JButton startButton;
   JButton stopButton;
   AudioClip onceClip;
   SlidePanel500 slidepanel500;
   ImageIcon[] images;
   Thread t;
   int n = 7; //NUM_IMAGES
   String[] str={"コスモス(昭和記念公園 2003)","コスモス1","コスモス2",
       "コスモス3","コスモス4","コスモス5","コスモス6"};
   String slideName = "kosmos";
   String midiFile= "coroptica.mid";

   public int i;
   public int height;
   public ImageIcon img;
   public String str2;

   public void init(){
        contentPane = getContentPane();
        JPanel minipanel= new JPanel();         

        startButton = new JButton("Start");
        stopButton = new JButton("Stop");
        startButton.addActionListener(this);
        stopButton.addActionListener(this);

        images = new ImageIcon[n];
        for (int j = 0; j < n; j++) {
           String imageName = slideName + j + ".jpg";
           try{images[j]=new ImageIcon(new URL(getCodeBase(),imageName));              } catch (Exception e) {}
        }

        Dimension d = getSize();
        height = d.height;
        System.out.println("init height = " + height);
	contentPane.add(minipanel,BorderLayout.NORTH);
        minipanel.add(startButton);
        minipanel.add(stopButton);
        minipanel.setBackground(Color.green);
        slidepanel500=new SlidePanel500();
	contentPane.add(slidepanel500,BorderLayout.CENTER);
        slidepanel500.setBackground(Color.yellow);
    }
  

     public void actionPerformed(ActionEvent event) {
        Object source = event.getSource();
        if (source == startButton) {
           onceClip = getAudioClip(getCodeBase(),midiFile);
           onceClip.play();     //AudioPlay
        // スレッドを起動する
           t = new Thread(this);
           t.start();
        } 
        if (source == stopButton) {
           onceClip.stop();    //AudioStop
           stop();
        } 
     }

     public void run() {
        try {
           Thread mythread = Thread.currentThread();         
            i=0;
           while(t == mythread) {
             start();
             Thread.sleep(3000);
             i++;
             if (i == n) 
               i=0;
           }
        }
        catch (Exception e) {
        }
     }

   public void start() {
        System.out.println("start i = " + i);
        getheight();
        geti();
        getimg(i);
        getstr(i);
        System.out.println("start2 i = " + i);
        slidepanel500.init(); 
    }

   public int getheight() {
        System.out.println("getheight height = " + height);
        return height;
   }

   public int geti() {
        System.out.println("geti i = " + i);
        return i;
   }

   public ImageIcon getimg(int i) {
        System.out.println("getimg i = " + i);
        img=images[i];
        return img;
   }
   
   public String getstr(int i) {
        System.out.println("getstr  str[i] = " + str[i]);
        return str[i];
   }

  public void stop() {
        t=null;
    }
}

class SlidePanel500 extends JPanel {
      ImageIcon imgicon;
      String string;
      int height;
      int k; 

     public void init() {
         Slideshow500 ss =new Slideshow500();
         System.out.println("SlidePanel500");
         k=ss.geti();
         string=ss.getstr(k);
         height= ss.getheight();
         System.out.println("SlidePanel500 init k= "  + k + " string = " + string + " height = " + height);
         imgicon=ss.getimg(k);
         repaint();
     }

     public void paintComponent(Graphics g) {
         System.out.println("paintComponent");
         super.paintComponent(g);
         System.out.println("paintComponent" + " string = " + string + " height = " + height);
         g.setFont(new Font("Serif", Font.BOLD, 30));
         g.setColor(Color.blue);
         g.drawString(string,220,height-50);
 //        imgicon.paintIcon(this,g,50,30);
    }
 }

/*
1  SlidePanelから、Slideshowのオブジェクト変数、str2,img,heightを呼び、表示させようとした。いずれもpublicとして「事なれり」と思ったら、これがだめ。
 初期値しか呼べないようだ。
2 そこで、getimg,getstr,getheightとして、メソッドを使おうとしてもだめ。thread起動後、getimgなどを通らないためかと考え、startメソッドの中でも呼んだが、それでもだめだった。
3 heightにいたっては、initで600となるのに、getheightでは初期値の0。同じクラスの中で値が伝わらないのはなぜ? 

C:\HPBasic\Toppage-sample3\MySwing\Slideshow100>appletviewer Slideshow500.java
init height = 600
start i = 0
getheight height = 600
geti i = 0
getimg i = 0
getstr  str[i] = コスモス(昭和記念公園 2003)
start2 i = 0
SlidePanel500
geti i = 0
getstr  str[i] = コスモス(昭和記念公園 2003)
getheight height = 0
SlidePanel500 init k= 0 string = コスモス(昭和記念公園 2003) height = 0
getimg i = 0
java.lang.NullPointerException
        at Slideshow500.getimg(Slideshow500.java:117)
        at SlidePanel500.init(Slideshow500.java:144)
        at Slideshow500.start(Slideshow500.java:102)
        at sun.applet.AppletPanel.run(AppletPanel.java:377)
        at java.lang.Thread.run(Thread.java:534)
*/