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<h1>interp.h</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">// interp.h</span>
00002 <span class="comment">//</span>
00003 <span class="comment">// Copyright (C) 2003, 2004 Jason Bevins</span>
00004 <span class="comment">//</span>
00005 <span class="comment">// This library is free software; you can redistribute it and/or modify it</span>
00006 <span class="comment">// under the terms of the GNU Lesser General Public License as published by</span>
00007 <span class="comment">// the Free Software Foundation; either version 2.1 of the License, or (at</span>
00008 <span class="comment">// your option) any later version.</span>
00009 <span class="comment">//</span>
00010 <span class="comment">// This library is distributed in the hope that it will be useful, but WITHOUT</span>
00011 <span class="comment">// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
00012 <span class="comment">// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public</span>
00013 <span class="comment">// License (COPYING.txt) for more details.</span>
00014 <span class="comment">//</span>
00015 <span class="comment">// You should have received a copy of the GNU Lesser General Public License</span>
00016 <span class="comment">// along with this library; if not, write to the Free Software Foundation,</span>
00017 <span class="comment">// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span>
00018 <span class="comment">//</span>
00019 <span class="comment">// The developer's email is jlbezigvins@gmzigail.com (for great email, take</span>
00020 <span class="comment">// off every 'zig'.)</span>
00021 <span class="comment">//</span>
00022
00023 <span class="preprocessor">#ifndef NOISE_INTERP_H</span>
00024 <span class="preprocessor"></span><span class="preprocessor">#define NOISE_INTERP_H</span>
00025 <span class="preprocessor"></span>
00026 <span class="keyword">namespace </span>noise
00027 {
00028
00031
<a name="l00046"></a><a class="code" href="group__libnoise.html#ga12">00046</a> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group__libnoise.html#ga12">CubicInterp</a> (<span class="keywordtype">double</span> n0, <span class="keywordtype">double</span> n1, <span class="keywordtype">double</span> n2, <span class="keywordtype">double</span> n3,
00047 <span class="keywordtype">double</span> a)
00048 {
00049 <span class="keywordtype">double</span> p = (n3 - n2) - (n0 - n1);
00050 <span class="keywordtype">double</span> q = (n0 - n1) - p;
00051 <span class="keywordtype">double</span> r = n2 - n0;
00052 <span class="keywordtype">double</span> s = n1;
00053 <span class="keywordflow">return</span> p * a * a * a + q * a * a + r * a + s;
00054 }
00055
<a name="l00067"></a><a class="code" href="group__libnoise.html#ga13">00067</a> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group__libnoise.html#ga13">LinearInterp</a> (<span class="keywordtype">double</span> n0, <span class="keywordtype">double</span> n1, <span class="keywordtype">double</span> a)
00068 {
00069 <span class="keywordflow">return</span> ((1.0 - a) * n0) + (a * n1);
00070 }
00071
<a name="l00082"></a><a class="code" href="group__libnoise.html#ga14">00082</a> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group__libnoise.html#ga14">SCurve3</a> (<span class="keywordtype">double</span> a)
00083 {
00084 <span class="keywordflow">return</span> (a * a * (3.0 - 2.0 * a));
00085 }
00086
<a name="l00100"></a><a class="code" href="group__libnoise.html#ga15">00100</a> <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="group__libnoise.html#ga15">SCurve5</a> (<span class="keywordtype">double</span> a)
00101 {
00102 <span class="keywordtype">double</span> a3 = a * a * a;
00103 <span class="keywordtype">double</span> a4 = a3 * a;
00104 <span class="keywordtype">double</span> a5 = a4 * a;
00105 <span class="keywordflow">return</span> (6.0 * a5) - (15.0 * a4) + (10.0 * a3);
00106 }
00107
00108 <span class="comment">// @}</span>
00109
00110 }
00111
00112 <span class="preprocessor">#endif</span>
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