//cd c:\HPBasic\Toppage-sample3\MySwing\Slideshow100
//javac Slideshow20.java
//set CLASSPATH=.	
//appletviewer Slideshow20.html
//appletviewer Slideshow20.java

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

/*
    <applet code="Slideshow20.class" width=620 height=560></applet>
*/

public class Slideshow20 extends JApplet implements ActionListener,Runnable {
   Container contentPane;
   SlidePanel20 slidepanel20;
   JButton startButton;
   JButton stopButton;
   AudioClip onceClip;
   Thread t;
   ImageIcon icon;
   int i = 0;
   int n = 7; //NUM_IMAGES
   String str ="コスモス";

   public void init(){
        contentPane = getContentPane();
        System.out.println("Slideshow20 init 1");
	slidepanel20 = new SlidePanel20(icon,str);
        System.out.println("Slideshow20 init 2");
        Dimension d =new Dimension(600,480);
      
        JPanel minipanel= new JPanel();         

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

	contentPane.add(minipanel,BorderLayout.NORTH);
	contentPane.add(slidepanel20,BorderLayout.CENTER);
        minipanel.add(startButton);
        minipanel.add(stopButton);
        minipanel.setBackground(Color.green);
        slidepanel20.setBackground(Color.yellow);
    }

     public void actionPerformed(ActionEvent event) {
        Object source = event.getSource();
        if (source == startButton) {
           String midiFile = "coroptica.mid";
           onceClip = getAudioClip(getCodeBase(),midiFile);
           onceClip.play();     //AudioPlay
	   start();
        } 
        if (source == stopButton) {
           onceClip.stop();    //AudioStop
           stop();
        } 
     }

  public void start(){
        // スレッドを起動する
        t = new Thread(this);
        t.start();
    }
 
     public void run() {
        try {
           Thread mythread = Thread.currentThread();         
           while(t == mythread) {
             i++;
             if (i > n) 
               i=1;
             System.out.println("run " + " i = " + i);
             update(); 
             Thread.sleep(3000);
           }
        }
        catch (Exception e) {
        }
     }

   public void update(){
        String imageName = "kosmos" + i + ".jpg";
        URL baseURL = getCodeBase();
        icon = new ImageIcon(getURL(baseURL,imageName));
        switch(i) {
               case 1: str="コスモス1";
                       break;
               case 2: str="コスモス2";
                       break;
               case 3: str="コスモス3";
                       break;
               case 4: str="コスモス4";
                       break;
               case 5: str="コスモス5";
                       break;
               case 6: str="コスモス6";
                       break;
               case 7: str="コスモス7";
                       break;
               default: str="不明";
             }
         System.out.println("update 1" + " i = " + i + " str = " + str);
         slidepanel20=new SlidePanel20(icon,str);
         System.out.println("update 2");
         slidepanel20.init(); 
  }

     protected URL getURL(URL codeBase, String filename) {
        URL url = null;
        try {
            url = new URL(codeBase, filename);
        } catch (java.net.MalformedURLException e) {
            System.out.println("Couldn't create image: badly specified URL");
            return null;
        }
        return url;
    }

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

  class SlidePanel20 extends JPanel {
     ImageIcon icon;
     String str;

     SlidePanel20(ImageIcon icon,String str){
          this.icon = icon;
          this.str= str;
          System.out.println("SlidePanel20" + " str = " + str );
    }

     public void init() {
        System.out.println("SlidePanel20 init");
        repaint(); 
     }

      public void paintComponent(Graphics g) {
        super.paintComponent(g);
        System.out.println("paintComponent");
        g.drawImage(icon.getImage(),0,0,null);
	g.setFont(new Font("Serif", Font.BOLD, 30));
        g.setColor(Color.blue);
        g.drawString("" + str,220,510);
//       System.out.println("paint i = " +  i + " imageName = " + imageName);
     }
}

/*
Slideshow20 init 1
SlidePanel20 str = コスモス
Slideshow20 init 2
run  i = 1
paintComponent
java.lang.NullPointerException
        at SlidePanel20.paintComponent(Slideshow20.java:148)
        at javax.swing.JComponent.paint(JComponent.java:808)
        at javax.swing.JComponent.paintChildren(JComponent.java:647)
        at javax.swing.JComponent.paint(JComponent.java:817)
        at javax.swing.JComponent.paintChildren(JComponent.java:647)
        at javax.swing.JComponent.paint(JComponent.java:817)
        at javax.swing.JLayeredPane.paint(JLayeredPane.java:557)
        at javax.swing.JComponent.paintChildren(JComponent.java:647)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4794)        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4740)
        at javax.swing.JComponent.paint(JComponent.java:798)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
        at java.awt.Container.paint(Container.java:1312)
        at sun.awt.RepaintArea.paint(RepaintArea.java:177)
        at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260)
        at java.awt.Component.dispatchEventImpl(Component.java:3678)
        at java.awt.Container.dispatchEventImpl(Container.java:1627)
        at java.awt.Component.dispatchEvent(Component.java:3477)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
update 1 i = 1 str = コスモス1
SlidePanel20 str = コスモス1
update 2
SlidePanel20 init
run  i = 2
update 1 i = 2 str = コスモス2
SlidePanel20 str = コスモス2
update 2
SlidePanel20 init
*/