Multimedia: Images, Animation

Transcription

chpt_16.fm Page 774 Wednesday, February 23, 2000 12:22 PM
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MULTIMEDIA: IMAGES, ANIMATION, AUDIO AND VIDEO
CHAPTER 16
16
Multimed ia:
Images,
Animation,
Audio an d Video
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/ Fig. 16.1: LoadImageAndScale.java
// Load an image and display it in its original size
// and scale it to twice its original width and height.
// Load and display the same image as an ImageIcon.
import java.applet.Applet;
import java.awt.*;
import javax.swing.*;
public class LoadImageAndScale extends JApplet {
private Image logo1;
private ImageIcon logo2;
// load the image when the applet is loaded
public void init()
{
logo1 = getImage( getDocumentBase(), "logo.gif" );
logo2 = new ImageIcon( "logo.gif" );
}
// display the image
public void paint( Graphics g )
{
// draw the original image
g.drawImage( logo1, 0, 0, this );
// draw the image scaled to fit the width of the applet
// and the height of the applet minus 120 pixels
g.drawImage( logo1, 0, 120,
getWidth(), getHeight() - 120, this );
// draw the icon using its paintIcon method
logo2.paintIcon( this, g, 180, 0 );
}
}
Fig. 16.1
Loading and displaying an image in an applet (part 1 of 2).
© Copyright 2000 by Prentice Hall. All Rights Reserved.
For use only by instructors in classes for which Java How to Program, Third Edition is the required textbook.
CHAPTER 16
Fig. 16.1
MULTIMEDIA: IMAGES, ANIMATION, A UDIO AND VIDEO
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Loading and displaying an image in an applet (part 2 of 2).
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// Fig. 16.2: LoadAudioAndPlay.java
// Load an audio clip and play it.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
Fig. 16.2
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CHAPTER 16
Loading and playing an AudioClip (part 1 of 3).
public class LoadAudioAndPlay extends JApplet {
private AudioClip sound1, sound2, currentSound;
private JButton playSound, loopSound, stopSound;
private JComboBox chooseSound;
// load the image when the applet begins executing
public void init()
{
Container c = getContentPane();
c.setLayout( new FlowLayout() );
String choices[] = { "Welcome", "Hi" };
chooseSound = new JComboBox( choices );
chooseSound.addItemListener(
new ItemListener() {
public void itemStateChanged( ItemEvent e )
{
currentSound.stop();
currentSound =
chooseSound.getSelectedIndex() == 0 ?
sound1 : sound2;
}
}
);
c.add( chooseSound );
ButtonHandler handler = new ButtonHandler();
playSound = new JButton( "Play" );
playSound.addActionListener( handler );
c.add( playSound );
loopSound = new JButton( "Loop" );
loopSound.addActionListener( handler );
c.add( loopSound );
stopSound = new JButton( "Stop" );
stopSound.addActionListener( handler );
c.add( stopSound );
sound1 = getAudioClip(
getDocumentBase(), "welcome.wav" );
sound2 = getAudioClip(
getDocumentBase(), "hi.au" );
currentSound = sound1;
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}
// stop the sound when the user switches Web pages
// (i.e., be polite to the user)
public void stop()
{
}
Fig. 16.2
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private class ButtonHandler implements ActionListener {
public void actionPerformed( ActionEvent e )
{
if ( e.getSource() == playSound )
currentSound.play();
else if ( e.getSource() == loopSound )
currentSound.loop();
else if ( e.getSource() == stopSound )
}
}
}
Fig. 16.2
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// Fig. 16.3: MediaPlayerDemo.java
// Uses a Java Media Player to play media files.
import java.awt.*;
import java.io.*;
import javax.media.*;
public class MediaPlayerDemo extends JFrame {
private Player player;
private File file;
public MediaPlayerDemo()
{
super( "Demonstrating the Java Media Player" );
JButton openFile = new JButton( "Open file to play" );
openFile.addActionListener(
new ActionListener() {
{
openFile();
createPlayer();
}
}
);
getContentPane().add( openFile, BorderLayout.NORTH );
setSize( 300, 300 );
show();
}
private void openFile()
{
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog( this );
Fig. 16.3
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CHAPTER 16
Demonstrating the Java Media Player (part 1 of 4).
// user clicked Cancel button on dialog
if ( result == JFileChooser.CANCEL_OPTION )
file = null;
else
file = fileChooser.getSelectedFile();
}
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Fig. 16.3
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private void createPlayer()
{
if ( file == null )
return;
removePreviousPlayer();
try {
// create a new player and add listener
player = Manager.createPlayer( file.toURL() );
player.addControllerListener( new EventHandler() );
player.start(); // start player
}
catch ( Exception e ){
JOptionPane.showMessageDialog( this,
"Invalid file or location", "Error loading file",
JOptionPane.ERROR_MESSAGE );
}
}
private void removePreviousPlayer()
{
if ( player == null )
return;
player.close();
Component visual = player.getVisualComponent();
Component control = player.getControlPanelComponent();
if ( visual != null )
c.remove( visual );
if ( control != null )
c.remove( control );
}
public static void main(String args[])
{
MediaPlayerDemo app = new MediaPlayerDemo();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
System.exit(0);
}
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CHAPTER 16
}
);
}
// inner class to handler events from media player
private class EventHandler implements ControllerListener {
public void controllerUpdate( ControllerEvent e ) {
if ( e instanceof RealizeCompleteEvent ) {
// load Visual and Control components if they exist
Component visualComponent =
player.getVisualComponent();
if ( visualComponent != null )
c.add( visualComponent, BorderLayout.CENTER );
Component controlsComponent =
player.getControlPanelComponent();
if ( controlsComponent != null )
c.add( controlsComponent, BorderLayout.SOUTH );
c.doLayout();
}
}
}
Initial GUI at execution
Fig. 16.3
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Selecting a
media file to
play from a
JFileChooser
dialog box
The Sample3.mpg file
loaded and playing
Fig. 16.3
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Pause button:
Displayed when
the clip is playing.
Play button:
Displayed when
the clip is playing.
Fig. 16.4
Position indicator
Mute
Volume control
CHAPTER 16
Information about
the currently playing clip.
Controls for the Java Media Player when an audio or video is playing.
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// Fig. 16.5: LogoAnimator.java
// Animation a series of images
import java.awt.*;
public class LogoAnimator extends JPanel
implements ActionListener {
protected ImageIcon images[];
protected int totalImages = 30,
currentImage = 0,
animationDelay = 50; // 50 millisecond delay
protected Timer animationTimer;
Fig. 16.5
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Animating a series of images (part 1 of 3).
public LogoAnimator()
{
setSize( getPreferredSize() );
images = new ImageIcon[ totalImages ];
for ( int i = 0; i < images.length; ++i )
images[ i ] =
new ImageIcon( "images/deitel" + i + ".gif" );
startAnimation();
}
public void paintComponent( Graphics g )
{
super.paintComponent( g );
if ( images[ currentImage ].getImageLoadStatus() ==
MediaTracker.COMPLETE ) {
images[ currentImage ].paintIcon( this, g, 0, 0 );
currentImage = ( currentImage + 1 ) % totalImages;
}
}
{
repaint();
}
public void startAnimation()
{
if ( animationTimer == null ) {
currentImage = 0;
animationTimer = new Timer( animationDelay, this );
animationTimer.start();
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}
else // continue from last image displayed
if ( ! animationTimer.isRunning() )
animationTimer.restart();
}
public void stopAnimation()
{
animationTimer.stop();
}
public Dimension getMinimumSize()
{
return getPreferredSize();
}
Fig. 16.5
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CHAPTER 16
public Dimension getPreferredSize()
{
return new Dimension( 160, 80 );
}
public static void main( String args[] )
{
LogoAnimator anim = new LogoAnimator();
JFrame app = new JFrame( "Animator test" );
app.getContentPane().add( anim, BorderLayout.CENTER );
{
System.exit( 0 );
}
}
);
// The constants 10 and 30 are used below to size the
// window 10 pixels wider than the animation and
// 30 pixels taller than the animation.
app.setSize( anim.getPreferredSize().width + 10,
anim.getPreferredSize().height + 30 );
app.show();
}
}
CHAPTER 16
Fig. 16.5
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// Fig. 16.6: LogoAnimator.java
// Animating a series of images
import java.awt.*;
Customizing an applet via the param HTML tag (part 1 of 5).
Fig. 16.6
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CHAPTER 16
public class LogoAnimator extends JPanel
implements ActionListener {
protected ImageIcon images[];
protected int totalImages = 30,
currentImage = 0,
animationDelay = 50; // 50 millisecond delay
protected String imageName = "deitel";
protected Timer animationTimer;
public LogoAnimator()
{
initializeAnim();
}
// new constructor to support customization
public LogoAnimator( int num, int delay, String name )
{
totalImages = num;
animationDelay = delay;
imageName = name;
initializeAnim();
}
private void initializeAnim()
{
images = new ImageIcon[ totalImages ];
for ( int i = 0; i < images.length; ++i )
images[ i ] = new ImageIcon( "images/" +
imageName + i + ".gif" );
// moved here so getPreferredSize can check the size of
// the first loaded image.
setSize( getPreferredSize() );
startAnimation();
}
public void paintComponent( Graphics g )
{
super.paintComponent( g );
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if ( images[ currentImage ].getImageLoadStatus() ==
MediaTracker.COMPLETE ) {
images[ currentImage ].paintIcon( this, g, 0, 0 );
currentImage = ( currentImage + 1 ) % totalImages;
}
}
{
Fig. 16.6
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repaint();
}
public void startAnimation()
{
if ( animationTimer == null ) {
currentImage = 0;
animationTimer = new Timer( animationDelay, this );
animationTimer.start();
}
else // continue from last image displayed
if ( ! animationTimer.isRunning() )
animationTimer.restart();
}
public void stopAnimation()
{
animationTimer.stop();
}
public Dimension getMinimumSize()
{
return getPreferredSize();
}
public Dimension getPreferredSize()
{
return new Dimension( images[ 0 ].getIconWidth(),
images[ 0 ].getIconHeight() );
}
public static void main( String args[] )
{
LogoAnimator anim = new LogoAnimator();
JFrame app = new JFrame( "Animator test" );
app.getContentPane().add( anim, BorderLayout.CENTER );
{
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Fig. 16.6
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//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
CHAPTER 16
System.exit( 0 );
}
}
);
app.setSize( anim.getPreferredSize().width + 10,
anim.getPreferredSize().height + 30 );
app.show();
}
Fig. 16.6: LogoApplet.java
Customizing an applet via HTML parameters
HTML parameter "animationdelay" is an int indicating
milliseconds to sleep between images (default 50).
HTML parameter "imagename" is the base name of the images
that will be displayed (i.e., "deitel" is the base name
for images "deitel0.gif," "deitel1.gif," etc.). The applet
assumes that images are in an "images" subdirectory of
the directory in which the applet resides.
HTML parameter "totalimages" is an integer representing the
total number of images in the animation. The applet assumes
images are numbered from 0 to totalimages - 1 (default 30).
import java.awt.*;
public class LogoApplet extends JApplet{
public void init()
{
String parameter;
parameter = getParameter( "animationdelay" );
int animationDelay = ( parameter == null ? 50 :
Integer.parseInt( parameter ) );
String imageName = getParameter( "imagename" );
parameter = getParameter( "totalimages" );
int totalImages = ( parameter == null ? 0 :
Integer.parseInt( parameter ) );
// Create an instance of LogoAnimator
LogoAnimator animator;
if ( imageName == null || totalImages == 0 )
animator = new LogoAnimator();
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else
animator = new LogoAnimator( totalImages,
animationDelay, imageName );
setSize( animator.getPreferredSize().width,
animator.getPreferredSize().height );
getContentPane().add( animator, BorderLayout.CENTER );
animator.startAnimation();
}
Fig. 16.6
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// Fig. 16.7: ImageMap.java
// Demonstrating an image map.
import java.awt.*;
public class ImageMap extends JApplet {
private ImageIcon mapImage;
private int width, height;
Fig. 16.7
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public void init()
{
addMouseListener(
new MouseAdapter() {
public void mouseExited( MouseEvent e )
{
showStatus( "Pointer outside applet" );
}
}
);
addMouseMotionListener(
new MouseMotionAdapter() {
public void mouseMoved( MouseEvent e )
{
showStatus( translateLocation( e.getX() ) );
}
}
);
mapImage = new ImageIcon( "icons2.gif" );
width = mapImage.getIconWidth();
height = mapImage.getIconHeight();
setSize( width, height );
}
public void paint( Graphics g )
{
mapImage.paintIcon( this, g, 0, 0 );
}
Demonstrating an image map (part 1 of 2).
public String translateLocation( int x )
{
// determine width of each icon (there are 6)
int iconWidth = width / 6;
if ( x >=
return
else if (
return
0 && x <= iconWidth )
"Common Programming Error";
x > iconWidth && x <= iconWidth * 2 )
"Good Programming Practice";
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else if (
return
else if (
return
else if (
return
else if (
return
x > iconWidth * 2 && x <= iconWidth
"Performance Tip";
"Portability Tip";
"Software Engineering Observation";
"Testing and Debugging Tip";
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* 3 )
* 4 )
* 5 )
* 6 )
return "";
}
}
Fig. 16.7
Demonstrating an image map (part 2 of 2).
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CHAPTER 16
The Java Plug-in
HTML Converter.
This program allows
you to convert all
the HTML files in one
directory or select
a specific file. In this
case, One File
is selected.
Fig. 16.8
The Java Plug-in HTML Converter (part 1 of 4).
CHAPTER 16
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This dialog allows
you to select the
file that will be
converted.
Fig. 16.8
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The HTML Converter
window after a file
is selected for conversion.
The Template File
combo box allows
you to choose the
browsers in which
the plug-in should
be used.
Fig. 16.8
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The confirmation
dialog showing that
one applet was
found in the HTML
file and converted.
Fig. 16.8

Multimedia: Images, Animation

Transcription

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