MemImage.java Source code

Introduction

Here is the source code for MemImage.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.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.MemoryImageSource;

/** MemImage is an in-memory icon showing a Color gradient. */
public class MemImage extends Component {

    /**
     * Demo main program, showing two ways to use it. Create a small MemImage
     * and set it as this Frame's iconImage. Also display a larger version of
     * the same image in the Frame.
     */
    public static void main(String[] av) {
        Frame f = new Frame("MemImage.java");
        f.add(new MemImage());
        f.setIconImage(new MemImage(16, 16).getImage());
        f.pack();
        f.setVisible(true);
    }

    /** The image */
    private Image img;

    /** The image width */
    private int w;

    /** The image height */
    private int h;

    /** Construct a MemImage with a default size */
    public MemImage() {
        this(100, 100);
    }

    /** Construct a MemImage with a specified width and height */
    public MemImage(int w, int h) {
        this.w = w;
        this.h = h;
        int pix[] = new int[w * h];
        int index = 0;
        for (int y = 0; y < h; y++) {
            int red = (y * 255) / (h - 1);
            for (int x = 0; x < w; x++) {
                int blue = (x * 255) / (w - 1);
                pix[index++] = (255 << 24) | (red << 16) | blue;
            }
        }
        img = createImage(new MemoryImageSource(w, h, pix, 0, w));
        setSize(getPreferredSize());
    }

    /** Getter for the Image */
    public Image getImage() {
        return img;
    }

    public Dimension getPreferredSize() {
        return new Dimension(w, h);
    }

    public void paint(Graphics g) {
        g.drawImage(img, 0, 0, getSize().width, getSize().height, this);
    }
}