|
/*
Java Media APIs: Cross-Platform Imaging, Media and Visualization
Alejandro Terrazas
Sams, Published November 2002,
ISBN 0672320940
*/
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFrame;
/**
* ImageLoaderApplet.java -- load and display image specified by imageURL
*/
public class ImageLoaderApplet extends Applet {
private Image img;
private String imageURLString = "peppers.png";
public void init() {
URL url;
try {
// set imageURL here
url = new URL(imageURLString);
img = getImage(url);
} catch (MalformedURLException me) {
showStatus("Malformed URL: " + me.getMessage());
}
}
/**
* overloaded method to prevent clearing drawing area
*/
public void update(Graphics g) {
paint(g);
}
public void paint(Graphics g) {
g.drawImage(img, 0, 0, this);
}
/**
* Verbose version of ImageConsumer's imageUpdate method
*/
public boolean imageUpdate(Image img, int flags, int x, int y, int width,
int height) {
System.out.print("Flag(s): ");
if ((flags & ImageObserver.WIDTH) != 0) {
System.out.print("WIDTH:(" + width + ") ");
}
if ((flags & ImageObserver.HEIGHT) != 0) {
System.out.print("HEIGHT:(" + height + ") ");
}
if ((flags & ImageObserver.PROPERTIES) != 0) {
System.out.print("PROPERTIES ");
}
if ((flags & ImageObserver.SOMEBITS) != 0) {
System.out.print("SOMEBITS(" + x + "," + y + ")->(");
System.out.print(width + "," + height + ") ");
repaint();
}
if ((flags & ImageObserver.FRAMEBITS) != 0) {
System.out.print("FRAMEBITS(" + x + "," + y + ")->(");
System.out.print(width + "," + height + ") ");
repaint();
}
if ((flags & ImageObserver.ALLBITS) != 0) {
System.out.print("ALLBITS(" + x + "," + y + ")->(");
System.out.println(width + "," + height + ") ");
repaint();
return false;
}
if ((flags & ImageObserver.ABORT) != 0) {
System.out.println("ABORT \n");
return false;
}
if ((flags & ImageObserver.ERROR) != 0) {
System.out.println("ERROR ");
return false;
}
System.out.println();
return true;
}
public static void main(String[] argv) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ImageLoaderApplet a = new ImageLoaderApplet();
frame.getContentPane().add(a);
frame.setSize(300, 300);
a.init();
a.start();
frame.setVisible(true);
}
}
|
