ImageLoaderApplet.java Source code

Introduction

Here is the source code for ImageLoaderApplet.java

Source

/*
    
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);

    }
}