ImageView.java Source code

Introduction

Here is the source code for ImageView.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

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

/**
 * Standalone Image Viewer - works with any AWT-supported format.
 */
public class ImageView extends JComponent {
    /** The Image object */
    protected Image im;
    /** Size of the image */
    protected int width, height;
    /** The graphical component */
    protected Container cp;
    /** The name of the image file */
    protected String fileName;

    /** Construct an ImageView viewer, given a filename. */
    public ImageView(String fileName) {
        this.fileName = fileName;
        cp = this;

    }

    public void loadImage() {

        URL url = getClass().getResource(fileName);
        im = Toolkit.getDefaultToolkit().getImage(url);

        // ----- This part omitted from course notes for brevity -----
        // Use a MediaTracker to show the "best"? way of waiting
        // for an image to load, and how to check for errors.
        MediaTracker mt = new MediaTracker(this);
        mt.addImage(im, 0);
        try {
            mt.waitForID(0);
        } catch (InterruptedException e) {
            System.err.println("Unexpected interrupt in waitForID!");
            return;
        }
        if (mt.isErrorID(0)) {
            System.err.println("Couldn't load image file " + fileName);
            return;
        }

        // Now that we know the image has been loaded,
        // it is safe to take its width and height.
        // ----- End of part omitted from course notes for brevity -----
        width = im.getWidth(this);
        height = im.getHeight(this);
        setSize(width, height);
    }

    public void paint(Graphics g) {
        g.drawImage(im, 0, 0, this);
    }

    public static void main(String[] arg) {
        if (arg.length == 0) {
            System.err.println("Usage: ImageView file [...]");
        } else {
            for (int i = 0; i < arg.length; i++) {
                JFrame jf = new JFrame("ImageView: " + arg[i]);
                ImageView iv = new ImageView(arg[i]);
                jf.getContentPane().add(iv);
                iv.loadImage();
                jf.setSize(iv.getSize());
                jf.setVisible(true);
            }
        }
    }
}