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<h1>csutil/floatrand.h</h1><a href="floatrand_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">    Copyright (C) 2004 by Jorrit Tyberghein</span>
<a name="l00003"></a>00003 <span class="comment">    Copyright (C) 2005 by Eric Sunshine</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This library is free software; you can redistribute it and/or</span>
<a name="l00006"></a>00006 <span class="comment">    modify it under the terms of the GNU Library General Public</span>
<a name="l00007"></a>00007 <span class="comment">    License as published by the Free Software Foundation; either</span>
<a name="l00008"></a>00008 <span class="comment">    version 2 of the License, or (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This library is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00013"></a>00013 <span class="comment">    Library General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU Library General Public</span>
<a name="l00016"></a>00016 <span class="comment">    License along with this library; if not, write to the Free</span>
<a name="l00017"></a>00017 <span class="comment">    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00018"></a>00018 <span class="comment">*/</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="preprocessor">#ifndef __CS_CSUTIL_FLOATRAND_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSUTIL_FLOATRAND_H__</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "csextern.h"</span>
<a name="l00028"></a>00028 
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="vector3_8h.html" title="3D vector.">csgeom/vector3.h</a>"</span>
<a name="l00030"></a>00030 
<a name="l00034"></a><a class="code" href="classcsRandomFloatGen.html">00034</a> <span class="keyword">class </span>CS_CRYSTALSPACE_EXPORT <a class="code" href="classcsRandomFloatGen.html" title="Fast simple random number generator for floating point values.">csRandomFloatGen</a>
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036 <span class="keyword">private</span>:
<a name="l00037"></a>00037   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed;
<a name="l00038"></a>00038 
<a name="l00039"></a>00039 <span class="keyword">public</span>:
<a name="l00041"></a><a class="code" href="classcsRandomFloatGen.html#d03b2241b3697721c3d80db5aa2f96f0">00041</a>   <a class="code" href="classcsRandomFloatGen.html" title="Fast simple random number generator for floating point values.">csRandomFloatGen</a> ()
<a name="l00042"></a>00042   { Initialize(); }
<a name="l00044"></a><a class="code" href="classcsRandomFloatGen.html#d4a0b2f17e81731a2b6196772ff46bd2">00044</a>   <a class="code" href="classcsRandomFloatGen.html" title="Fast simple random number generator for floating point values.">csRandomFloatGen</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed)
<a name="l00045"></a>00045   { Initialize(seed); }
<a name="l00046"></a>00046 
<a name="l00048"></a>00048   <span class="keywordtype">void</span> Initialize();
<a name="l00050"></a><a class="code" href="classcsRandomFloatGen.html#d42ee0960504889f0bf029169bfebf39">00050</a>   <span class="keywordtype">void</span> Initialize(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> new_seed)
<a name="l00051"></a>00051   { seed = new_seed; }
<a name="l00052"></a>00052 
<a name="l00054"></a><a class="code" href="classcsRandomFloatGen.html#5d96d5b102fc5aa7a7c638db2de7ee4e">00054</a>   <span class="keyword">inline</span> <span class="keywordtype">float</span> Get()
<a name="l00055"></a>00055   {
<a name="l00056"></a>00056     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <span class="keyword">const</span> b = 1664525;
<a name="l00057"></a>00057     <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <span class="keyword">const</span> c = 1013904223;
<a name="l00058"></a>00058     seed = b * seed + c;
<a name="l00059"></a>00059     <span class="keyword">union</span>
<a name="l00060"></a>00060     {
<a name="l00061"></a>00061       <a class="code" href="group__util.html#g1134b580f8da4de94ca6b1de4d37975e" title="unsigned 32-bit integer (0..4 294 967 295)">uint32</a> jabi;
<a name="l00062"></a>00062       <span class="keywordtype">float</span> tastic;
<a name="l00063"></a>00063     } pun;
<a name="l00064"></a>00064     pun.jabi = 0x3f800000 | (0x007fffff &amp; seed);
<a name="l00065"></a>00065     <span class="keywordflow">return</span> pun.tastic - 1.0;
<a name="l00066"></a>00066   }
<a name="l00067"></a>00067 
<a name="l00069"></a><a class="code" href="classcsRandomFloatGen.html#7ee5ae56381fc06f2de7cfff3c67f8f7">00069</a>   <span class="keyword">inline</span> <span class="keywordtype">float</span> Get(<span class="keywordtype">float</span> max)
<a name="l00070"></a>00070   {
<a name="l00071"></a>00071     <span class="keywordflow">return</span> max * Get();
<a name="l00072"></a>00072   }
<a name="l00073"></a>00073 
<a name="l00075"></a><a class="code" href="classcsRandomFloatGen.html#b50cc7c856fd72725f5239d879510717">00075</a>   <span class="keyword">inline</span> <span class="keywordtype">float</span> Get(<span class="keywordtype">float</span> min, <span class="keywordtype">float</span> max)
<a name="l00076"></a>00076   {
<a name="l00077"></a>00077     <span class="keywordtype">float</span> <span class="keyword">const</span> w = max - min;
<a name="l00078"></a>00078     <span class="keywordflow">return</span> min + w * Get();
<a name="l00079"></a>00079   }
<a name="l00080"></a>00080 
<a name="l00082"></a><a class="code" href="classcsRandomFloatGen.html#e31f74b92486b0944e9cb10757d68d2a">00082</a>   <span class="keyword">inline</span> <span class="keywordtype">float</span> GetAngle()
<a name="l00083"></a>00083   {
<a name="l00084"></a>00084     <span class="keywordflow">return</span> TWO_PI * Get();
<a name="l00085"></a>00085   }
<a name="l00086"></a>00086 };
<a name="l00087"></a>00087 
<a name="l00091"></a><a class="code" href="classcsRandomVectorGen.html">00091</a> <span class="keyword">class </span>CS_CRYSTALSPACE_EXPORT <a class="code" href="classcsRandomVectorGen.html" title="Random number generator that generates random vector with spherical distribution...">csRandomVectorGen</a>
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="keyword">public</span>:
<a name="l00094"></a>00094 <span class="keyword">public</span>:
<a name="l00096"></a><a class="code" href="classcsRandomVectorGen.html#081e32dcb1279fa8a29edebc71c8c2cb">00096</a>   <a class="code" href="classcsRandomVectorGen.html" title="Random number generator that generates random vector with spherical distribution...">csRandomVectorGen</a> ()
<a name="l00097"></a>00097     : floatGen ()
<a name="l00098"></a>00098   {}
<a name="l00100"></a><a class="code" href="classcsRandomVectorGen.html#525e5da21cf145838e101aa388dd78ae">00100</a>   <a class="code" href="classcsRandomVectorGen.html" title="Random number generator that generates random vector with spherical distribution...">csRandomVectorGen</a> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seed)
<a name="l00101"></a>00101     : floatGen (seed)
<a name="l00102"></a>00102   {}
<a name="l00103"></a>00103 
<a name="l00105"></a><a class="code" href="classcsRandomVectorGen.html#9d297562847c0d684e2d3d5d3175b53e">00105</a>   <span class="keywordtype">void</span> Initialize()
<a name="l00106"></a>00106   {
<a name="l00107"></a>00107     floatGen.Initialize ();
<a name="l00108"></a>00108   }
<a name="l00110"></a><a class="code" href="classcsRandomVectorGen.html#758b682d9ca89964f03e7a2424b8f8b5">00110</a>   <span class="keywordtype">void</span> Initialize(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> new_seed)
<a name="l00111"></a>00111   { 
<a name="l00112"></a>00112     floatGen.Initialize (new_seed);
<a name="l00113"></a>00113   }
<a name="l00114"></a>00114 
<a name="l00116"></a><a class="code" href="classcsRandomVectorGen.html#d5218c843f0f3acb08648fcc667ba67f">00116</a>   <span class="keyword">inline</span> <a class="code" href="classcsVector3.html" title="A 3D vector.">csVector3</a> Get ()
<a name="l00117"></a>00117   {
<a name="l00118"></a>00118     <span class="comment">/* </span>
<a name="l00119"></a>00119 <span class="comment">    This is a variant of the algorithm for computing a random point</span>
<a name="l00120"></a>00120 <span class="comment">    on the unit sphere; the algorithm is suggested in Knuth, v2,</span>
<a name="l00121"></a>00121 <span class="comment">    3rd ed, p136; and attributed to Robert E Knop, CACM, 13 (1970),</span>
<a name="l00122"></a>00122 <span class="comment">    326. </span>
<a name="l00123"></a>00123 <span class="comment">    */</span>
<a name="l00124"></a>00124     <a class="code" href="classcsVector3.html" title="A 3D vector.">csVector3</a> ret (0.0f);
<a name="l00125"></a>00125     <span class="keywordtype">float</span> s, a;
<a name="l00126"></a>00126 
<a name="l00127"></a>00127     <span class="keywordflow">do</span> 
<a name="l00128"></a>00128     {
<a name="l00129"></a>00129       ret.<a class="code" href="classcsVector3.html#823fdba459ff91e8a5e6834ded7c815f" title="The X component of the vector.">x</a> = 2.0f * floatGen.Get () - 1.0f;
<a name="l00130"></a>00130       ret.<a class="code" href="classcsVector3.html#e0a74264b61eb5d61da63b3c101af719" title="The Y component of the vector.">y</a> = 2.0f * floatGen.Get () - 1.0f;
<a name="l00131"></a>00131       s = ret.<a class="code" href="classcsVector3.html#4f8fb0ed2df4d38898bbcda746c47552" title="Return the squared norm (magnitude) of this vector.">SquaredNorm</a> ();
<a name="l00132"></a>00132     } <span class="keywordflow">while</span>(s &gt; 1.0f);
<a name="l00133"></a>00133 
<a name="l00134"></a>00134     ret.<a class="code" href="classcsVector3.html#3f761bd195c7ccec59ea863a87a1ad05" title="The Z component of the vector.">z</a> = 2.0f * s - 1.0f;
<a name="l00135"></a>00135 
<a name="l00136"></a>00136     a = 2.0f * sqrtf (1.0f - s);
<a name="l00137"></a>00137     ret.<a class="code" href="classcsVector3.html#823fdba459ff91e8a5e6834ded7c815f" title="The X component of the vector.">x</a> *= a;
<a name="l00138"></a>00138     ret.<a class="code" href="classcsVector3.html#e0a74264b61eb5d61da63b3c101af719" title="The Y component of the vector.">y</a> *= a;
<a name="l00139"></a>00139 
<a name="l00140"></a>00140 <span class="comment">//    float x1, x2, x1sq, x2sq;</span>
<a name="l00141"></a>00141 <span class="comment">//    while (!haveNrs)</span>
<a name="l00142"></a>00142 <span class="comment">//    {</span>
<a name="l00143"></a>00143 <span class="comment">//      x1 = floatGen.Get (-1, 1);</span>
<a name="l00144"></a>00144 <span class="comment">//      x2 = floatGen.Get (-1, 1);</span>
<a name="l00145"></a>00145 <span class="comment">//      x1sq = x1*x1;</span>
<a name="l00146"></a>00146 <span class="comment">//      x2sq = x2*x2;</span>
<a name="l00147"></a>00147 <span class="comment">//      if ( (x1sq)+(x2sq) &lt; 1) haveNrs = true;</span>
<a name="l00148"></a>00148 <span class="comment">//    }</span>
<a name="l00149"></a>00149 <span class="comment">//    csVector3 ret;</span>
<a name="l00150"></a>00150 <span class="comment">//    ret.x = 2*x1*sqrtf(1-x1sq-x2sq);</span>
<a name="l00151"></a>00151 <span class="comment">//    ret.y = 2*x2*sqrtf(1-x1sq-x2sq);</span>
<a name="l00152"></a>00152 <span class="comment">//    ret.z = 1-2*(x1sq+x2sq);</span>
<a name="l00153"></a>00153 
<a name="l00154"></a>00154     <span class="keywordflow">return</span> ret;
<a name="l00155"></a>00155   }
<a name="l00156"></a>00156 
<a name="l00157"></a>00157 <span class="keyword">private</span>:
<a name="l00158"></a>00158   <a class="code" href="classcsRandomFloatGen.html" title="Fast simple random number generator for floating point values.">csRandomFloatGen</a> floatGen;
<a name="l00159"></a>00159 };
<a name="l00160"></a>00160 
<a name="l00161"></a>00161 <span class="preprocessor">#endif // __CS_CSUTIL_FLOATRAND_H__</span>
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