movingpenguin.java

java applet编程,实现对相关图片声音的调用

import java.awt.*;
import java.applet.*;

public class MovingPenguin extends Applet implements Runnable {
    int frameNumber = 0;
    int delay;
	int allFrame = 10;
    Thread animatorThread;

	Image offImage = null;
	Graphics offGraphics = null;

	Image images[];
	MediaTracker tracker;

	AudioClip  sound;

    public void init()
	{
        String str;
        int fps = 10;

        //How many milliseconds between frames?
        str = getParameter("fps");
        try {
            if (str != null)
			{
                fps = Integer.parseInt(str);
            }
        } catch (Exception e) {}
        delay = (fps > 0) ? (1000 / fps) : 100;

        //Load Images
        images = new Image[allFrame];
		tracker = new MediaTracker(this);

		for( int i = 1; i <= allFrame; i++ )
		{
			images[i-1] = getImage(getCodeBase(), "T" + i + ".gif");
			tracker.addImage(images[i-1], i-1);
		}
		try{
			tracker.waitForAll();
		}catch(Exception e){}

		try{
		    sound = getAudioClip(getDocumentBase(),"bark.au");
		}catch(Exception e){}
    }

    public void start()
	{
        //Start animating!
        if (animatorThread == null) {
            animatorThread = new Thread(this);
        }
        animatorThread.start();

		sound.loop();
    }

    public void stop()
	{
        //Stop the animating thread.
        animatorThread = null;
		offImage = null;
		offGraphics = null;

		sound.stop();
    }

    public void run()
	{
        //Just to be nice, lower this thread's priority
        //so it can't interfere with other processing going on.
        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
 
        //Remember the starting time.
        long startTime = System.currentTimeMillis();

        //This is the animation loop.
        while (Thread.currentThread() == animatorThread)
		{
            //Advance the animation frame.
            frameNumber++;

            //Display it.
            repaint();

            //Delay depending on how far we are behind.
            try {
                startTime += delay;
                Thread.sleep(Math.max(0, 
                                      startTime-System.currentTimeMillis()));
            } catch (InterruptedException e) {
                break;
            }
        }
    }

    public void update(Graphics g)
	{
		paint(g);
	}

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

		if( offImage == null || offGraphics == null )
		{
			offImage = createImage(d.width, d.height);
			offGraphics = offImage.getGraphics();
		}

		offGraphics.setColor( getBackground() );
		offGraphics.fillRect(0, 0, d.width, d.height);
		offGraphics.setColor( Color.black );

		//Paint the image onto the buffer image
		int no;
		no = frameNumber % allFrame;
		offGraphics.drawImage(images[no], 0, 0, this);


		//Paint the Image onto the screen.
		g.drawImage(offImage, 0, 0, this);
	}
}