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<meta name="KeyWords" content="free source code, R-Tree, skiplist, quaternion, intersection test, C++, class library">
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<center><b><font size=+3>Free Source Code</font></b></center>
<p><font size=+1>Here are a few useful bits of free source code. You're
completely free to use them for any purpose whatsoever. All I ask is that
if you find one to be particularly valuable, then consider sending a brief
thank you note to the email address in the code comments. Enjoy.</font>
<ul>
<li>
<font size=+1><a href="#Java Code">Java Code</a></font></li>
<li>
<font size=+1><a href="#C & C++ Code">C & C++</a></font></li>
</ul>
<hr WIDTH="100%">
<center><a NAME="Java Code"></a><b><font size=+2>Java Code</font></b></center>
<p><font color="#000000"><font size=+1>The links following each Java implementation
show HTML versions of the code with syntax highlighting which were generated
using the <a href="#java2html">Java to HTML</a> utility below. The simplest
way to download one as a .java file is to view the page and copy &
paste the text from your browser into a .java file.</font></font>
<p><font color="#CC0000"><font size=+1>JarLoader</font></font>
<p><font size=+1>Java class able to load all the jar files in a given directory
containing classes of a given type. It can also be set to continuously
track that directory for new jar files that are added later.</font>
<p><font size=+1> </font><a href="JarLoader.java.html">View
the code</a>
<p><font color="#CC0000"><font size=+1>Component Dependency Handler</font></font>
<p><font size=+1>A small Java GUI utility class. Ever pull your hair out
tracking down why some GUI component is not enabled or disabled when it
should be? Or visible or invisible, etc? Sometimes the rules for knowing
under exactly which combinations of application state should affect a given
component can get quite complicated, and creating listeners with complex
if/else blocks often result which need constant fixing. Well, there's a
better way to manage all those state changing rules. Rather than trying
to figure out all the possible components that might be affected by a given
component state change and trying to set their states directly, you can
create dependency graphs that describe which components are dependent on
which others and then enforce those dependencies through the use of the
ComponentDependencyHandler class. An object of this class represents all
the dependencies of one component's particular state upon one or more other
components. See the description and example code in the source file for
details.</font>
<blockquote><a href="ComponentDependencyHandler.java.html">View the code</a></blockquote>
<font color="#CC0000"><font size=+1>Infinite Binary Tree</font></font>
<p><font size=+1>Here is a good Java example of one important way to create
JTrees. This a tiny Java test program has some surprisingly interesting
behavior. It creates a JTree with an infinite number of internal nodes
and no leaf nodes! Each internal node is labeled with a unique positive
integer such that every positive number can be found if you know where
to look. The basic concept demonstrated is use of the TreeModel class to
display hierarchically structured information that may be huge or expensive
to access--for example, data in a database.</font>
<blockquote><a href="InfiniteBinaryTree.java.html">View the code</a></blockquote>
<a NAME="java2html"></a><font color="#CC0000"><font size=+1>java2html</font></font>
<p><font size=+1>You can find lots of converters by the same name with
a quick Google search on the term "java2html" but most are way more complex
than needed. I weeded through dozens and found this lettle gem which was
small but effective. I did expand on it a bit and think it's quite useful.
Click the following link to see the result of running java2hml.java on
itself.</font>
<blockquote><a href="java2html.java.html">View the code</a></blockquote>
<font color="#CC0000"><font size=+1>Stack Method Extractor</font></font>
<p><font size=+1>This simple yet clever utility contains a static method
which returns the full name of the method a given number of stack frames
above the calling method Click following link to see the code. It's magic.</font>
<blockquote><a href="StackMethodExtractor.java.html">View the code</a></blockquote>
<hr WIDTH="100%">
<center><a NAME="C & C++ Code"></a><b><font size=+2>C & C++ Code</font></b></center>
<p><font color="#CC0000"><font size=+1>R-Trees</font></font>
<p><font size=+1>Straight "C" implementation of Tony Gutman's R-Tree method,
R-Trees provide Log(n) speed rectangular indexing into multi-dimensional
data. Based on his original implementation, I've brought it up to date
with ANCI specifications and added a nice improvement based on sphere volumes.</font>
<p><font size=+1> </font><a href="RTree.zip">Download
R-Tree code</a>
<p><font color="#CC0000"><font size=+1>Skiplists</font></font>
<p><font color="#000000"><font size=+1>Skiplists are fast associative collections
invented by William Pugh. Key/Value pairs are added to skiplist containers
and can then values looked up extremely quickly by key. The implementation
is based on a fairly generic one originally in "C" by Bruno Grossniklaus
which I converted into a C++ class library.</font></font>
<p><font color="#000000"><font size=+1> </font><a href="SkipList.zip">Download
SkipList code</a></font>
<p><font color="#CC0000"><font size=+1>Quaternions</font></font>
<p><font size=+1>Implementation of a simple C++ quaternion class called
"Squat". Popularized by a seminal paper by Ken Shoemake, a quaternion represents
a rotation about an axis. Squats can be concatenated together via
the </font><b><code><font size=+2>*</font></code></b><font size=+1> and </font><b><code><font size=+2>*=</font></code></b><font size=+1>
operators and converted back and forth between transformation matrices.
Implementation also includes a wonderful 3D vector macro library by Don
Hatch.</font>
<p> <a href="squat.zip">Download Squat code</a>
<p><font color="#CC0000"><font size=+1>Polygon-Cube Intersection Testing</font></font>
<p><font size=+1>"C" implementation of an extremely fast and robust polygon-cube
intersection test by Don Hatch and myself as published in Graphics Gems
V. Very useful for collision detection and view frustum visibility checking.</font>
<p> <a href="README.TXT">View the readme file</a>
<br> <a href="pcube.zip">Download PCube code</a>
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