Wavelet.java Source code

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Here is the source code for Wavelet.java

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/*
 * 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.
 */

//applet.html

/*
<HTML><HEAD><TITLE>Java Wave Applet Demo</TITLE></HEAD>
<BODY BGCOLOR=Black TEXT=White Link=White VLink=White>
<H1>Java Wave Applet Demo</H1>
<H1>Wave Applet</H1>
<P>
This is a <EM>very</EM> simple applet that
draws the sum of a sine and a cosine wave.
<HR>
<P>And here is the demo:
<HR>
<APPLET code="Wavelet" width=500 height=200>
<P>This applet will only work if you're viewing it with a Java-1.1-enabled browser.<P>
</APPLET>
<HR>
<P>Here is the <A HREF="wavelet.java">source</A>.
<HR>
<address>http://www.darwinsys.com/,</address> adapted from code by <address>avh@eng.sun.com </address>
</BODY>
</HEAD>
    
    
*/

import java.applet.Applet;
import java.awt.Dimension;
import java.awt.Graphics;

/**
 * Simple Applet demo, showing a math function.
 * 
 * @author Arthur Van Hoff, avh
 * @author Ian F. Darwin, http://www.darwinsys.com/
 */
public class Wavelet extends Applet {
    /**
     * Called by AWT when the window needs painting; just recompute all the data
     * and draw it, since it's a simple calculation and simpler than
     * precomputing and storing the data.
     */
    public void paint(Graphics g) {
        Dimension d = getSize();
        for (int x = 0; x < d.width; x++) {
            g.drawLine(x, 20 + (int) func(x), x + 1, 20 + (int) func(x + 1));
        }
    }

    /** This is the function that is plotted. */
    double func(double x) {
        Dimension d = getSize();
        return (Math.cos(x / 9) + Math.sin(x / 3) + 1) * d.height / 4;
    }
}