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<html>
<head>
<title>
LIGHTS_OUT_OPENGL - OpenGL version of "Lights Out"
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
LIGHTS_OUT_OPENGL <br> OpenGL version of "Lights Out"
</title>
</h1>
<hr>
<p>
<b>LIGHTS_OUT_OPENGL</b>
is a C++ program which
sets up the "Lights Out" game and allows a user to try to solve it.
</p>
<p>
The Lights Out game is played on a rectangular board of squares,
each representing a light that may be on or off. Clicking the mouse
on a light switches it from on to off and vice versa. However, when
you switch a light, you also switch the lights to the immediate left,
right, above and below. (There is no "wrap around" however, in this
basic version of the game.)
</p>
<p>
You start the game by specifying the width and height of the board to
be used, and the number of moves the program should make in setting up
the inital board. Specifying 10 moves, for instance, means that the
program, starting from a board with all lights off, will randomly switch
a light and its neighbors 10 times.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>lights_out_opengl</b> <i>width</i> <i>height</i> <i>moves</i>
</blockquote>
where
<ul>
<li>
<i>width</i>, the number of squares in the horizontal direction (try 10);
</li>
<li>
<i>height</i> the number of squares in the vertical direction (try 10);
</li>
<li>
<i>moves</i> the number of randomizing moves made to initialize the board (try 5 first!);
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>LIGHTS_OUT_OPENGL</b> is available in
<a href = "../../c_src/lights_out_opengl/lights_out_opengl.html">a C version</a> and
<a href = "../../cpp_src/lights_out_opengl/lights_out_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/caustic_opengl/caustic_opengl.html">
CAUSTIC_OPENGL</a>,
a C++ program which
computes a caustic curve and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/fern_opengl/fern_opengl.html">
FERN_OPENGL</a>,
a C++ program which
uses OpenGL to display the Barnsley fractal fern.
</p>
<p>
<a href = "../../c_src/flood_opengl/flood_opengl.html">
FLOOD_OPENGL</a>,
a C program which
uses OpenGL to allow the user to select regions of a 2D image
and flood them with color, by Art Wetzel.
</p>
<p>
<a href = "../../c_src/life_opengl/life_opengl.html">
LIFE_OPENGL</a>,
a C program which
uses OpenGL to display the evolution of John Conway's "Game of Life",
by Simon Green.
</p>
<p>
<a href = "../../cpp_src/lissajous_opengl/lissajous_opengl.html">
LISSAJOUS_OPENGL</a>,
a C++ program which
computes a Lissajous figure and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/opengl/opengl.html">
OPENGL</a>,
C++ programs which
illustrate the use of the OpenGL graphics library;
</p>
<p>
<a href = "../../cpp_src/polygonal_surface_display_opengl/polygonal_surface_display_opengl.html">
POLYGONAL_SURFACE_DISPLAY_OPENGL</a>,
a C++ program which
displays a surface in 3D described as a set of polygons, using OpenGL.
</p>
<p>
<a href = "../../cpp_src/rotating_cube_display_opengl/rotating_cube_display_opengl.html">
ROTATING_CUBE_DISPLAY_OPENGL</a>,
a C++ program which
displays a rotating color cube in 3D, using OpenGL;
</p>
<p>
<a href = "../../cpp_src/sphere_xyz_display_opengl/sphere_xyz_display_opengl.html">
SPHERE_XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZ information defining points in 3D,
and displays a unit sphere and the points, using OpenGL.
</p>
<p>
<a href = "../../cpp_src/triangulation_display_opengl/triangulation_display_opengl.html">
TRIANGULATION_DISPLAY_OPENGL</a>,
a C++ program which
reads files defining a triangulation and displays an image
using Open GL.
</p>
<p>
<a href = "../../cpp_src/xyf_display_opengl/xyf_display_opengl.html">
XYF_DISPLAY_OPENGL</a>,
a C++ program which
reads XYF information defining points and faces in 2D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyz_display_opengl/xyz_display_opengl.html">
XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads an XYZ file of 3D point coordinates, and displays
an image of those points using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyzf_display_opengl/xyzf_display_opengl.html">
XYZF_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZF information defining points and faces in 3D, and displays
an image in a MATLAB graphics window.
</p>
<p>
<a href = "../../cpp_src/xyzl_display_opengl/xyzl_display_opengl.html">
XYZL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZL information defining points and lines in 3D, and displays
an image in a MATLAB graphics window.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Marlow Anderson, Todd Feil,<br>
Turning Lights Out With Linear Algebra,<br>
Mathematics Magazine,<br>
Volume 71, Number 4, October 1998, pages 300-303.
</li>
<li>
Edward Angel,<br>
Interactive Computer Graphics,
a Top-Down Approach with OpenGL,<br>
Addison-Wesley, 2000,<br>
ISBN: 0-201-38597-X,<br>
LC: T385.A514.
</li>
<li>
Oscar Martin-Sanchez,<br>
Two Analyses of Lights Out,<br>
Mathematics Magazine,<br>
Volume 74, Number 4, October 2001, pages 295-304.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "lights_out_opengl.cpp">lights_out_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "lights_out_opengl.sh">lights_out_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "display_6_9_20.png">display_6_9_20.png</a>,
a PNG image of the initial board you will see if you type
<blockquote><b>
lights_out_opengl 6 9 20
</b></blockquote>
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for LIGHTS_OUT_OPENGL.
</li>
<li>
<b>BOX_DRAW</b> draws one box of the Lights Out array.
</li>
<li>
<b>DISPLAY</b> generates the graphics output.
</li>
<li>
<b>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>I4_MIN</b> returns the minimum of two I4's.
</li>
<li>
<b>I4_UNIFORM</b> returns a scaled pseudorandom I4.
</li>
<li>
<b>MY_INIT</b> initializes OpenGL state variables dealing with viewing and attributes.
</li>
<li>
<b>MY_MOUSE</b> reacts to mouse events.
</li>
<li>
<b>R4_ABS</b> returns the absolute value of an R4.
</li>
<li>
<b>R4_NINT</b> returns the nearest integer to an R4.
</li>
<li>
<b>STATE_RANDOMIZE</b> randomizes the state.
</li>
<li>
<b>STATE_UPDATE</b> updates the state after button (I,J) has been pressed.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 17 January 2009.
</i>
<!-- John Burkardt -->
</body>
<!-- Initial HTML skeleton created by HTMLINDEX. -->
</html>