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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: qwt_math.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><h1>qwt_math.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************</span><a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span><a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span><a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span><a name="l00005"></a>00005 <span class="comment"> * </span><a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span><a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span><a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span><a name="l00009"></a>00009 <a name="l00010"></a>00010 <span class="preprocessor">#ifndef QWT_MATH_H</span><a name="l00011"></a>00011 <span class="preprocessor"></span><span class="preprocessor">#define QWT_MATH_H</span><a name="l00012"></a>00012 <span class="preprocessor"></span><a name="l00013"></a>00013 <span class="preprocessor">#include <math.h></span><a name="l00014"></a>00014 <span class="preprocessor">#include <qpoint.h></span><a name="l00015"></a>00015 <span class="preprocessor">#include "qwt_global.h"</span><a name="l00016"></a>00016 <a name="l00017"></a>00017 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00018"></a>00018 <span class="preprocessor"></span><a name="l00019"></a>00019 <span class="preprocessor">#define qwtMax QMAX</span><a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define qwtMin QMIN</span><a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define qwtAbs QABS</span><a name="l00022"></a>00022 <span class="preprocessor"></span><a name="l00023"></a>00023 <span class="preprocessor">#else // QT_VERSION >= 0x040000</span><a name="l00024"></a>00024 <span class="preprocessor"></span><a name="l00025"></a>00025 <span class="preprocessor">#define qwtMax qMax</span><a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#define qwtMin qMin</span><a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define qwtAbs qAbs</span><a name="l00028"></a>00028 <span class="preprocessor"></span><a name="l00029"></a>00029 <span class="preprocessor">#endif</span><a name="l00030"></a>00030 <span class="preprocessor"></span><a name="l00031"></a>00031 <span class="preprocessor">#ifndef LOG10_2</span><a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#define LOG10_2 0.30102999566398119802 </span><span class="comment">/* log10(2) */</span><a name="l00033"></a>00033 <span class="preprocessor">#endif</span><a name="l00034"></a>00034 <span class="preprocessor"></span><a name="l00035"></a>00035 <span class="preprocessor">#ifndef LOG10_3</span><a name="l00036"></a>00036 <span class="preprocessor"></span><span class="preprocessor">#define LOG10_3 0.47712125471966243540 </span><span class="comment">/* log10(3) */</span><a name="l00037"></a>00037 <span class="preprocessor">#endif</span><a name="l00038"></a>00038 <span class="preprocessor"></span><a name="l00039"></a>00039 <span class="preprocessor">#ifndef LOG10_5</span><a name="l00040"></a>00040 <span class="preprocessor"></span><span class="preprocessor">#define LOG10_5 0.69897000433601885749 </span><span class="comment">/* log10(5) */</span><a name="l00041"></a>00041 <span class="preprocessor">#endif</span><a name="l00042"></a>00042 <span class="preprocessor"></span><a name="l00043"></a>00043 <span class="preprocessor">#ifndef M_2PI</span><a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#define M_2PI 6.28318530717958623200 </span><span class="comment">/* 2 pi */</span><a name="l00045"></a>00045 <span class="preprocessor">#endif</span><a name="l00046"></a>00046 <span class="preprocessor"></span><a name="l00047"></a>00047 <span class="preprocessor">#ifndef LOG_MIN</span><a name="l00048"></a>00048 <span class="preprocessor"></span><a name="l00049"></a>00049 <span class="preprocessor">#define LOG_MIN 1.0e-100</span><a name="l00050"></a>00050 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00051"></a>00051 <span class="preprocessor"></span><a name="l00052"></a>00052 <span class="preprocessor">#ifndef LOG_MAX</span><a name="l00053"></a>00053 <span class="preprocessor"></span><a name="l00054"></a>00054 <span class="preprocessor">#define LOG_MAX 1.0e100</span><a name="l00055"></a>00055 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00056"></a>00056 <span class="preprocessor"></span><a name="l00057"></a>00057 <span class="preprocessor">#ifndef M_E</span><a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#define M_E 2.7182818284590452354 </span><span class="comment">/* e */</span><a name="l00059"></a>00059 <span class="preprocessor">#endif</span><a name="l00060"></a>00060 <span class="preprocessor"></span><a name="l00061"></a>00061 <span class="preprocessor">#ifndef M_LOG2E</span><a name="l00062"></a>00062 <span class="preprocessor"></span><span class="preprocessor">#define M_LOG2E 1.4426950408889634074 </span><span class="comment">/* log_2 e */</span><a name="l00063"></a>00063 <span class="preprocessor">#endif</span><a name="l00064"></a>00064 <span class="preprocessor"></span><a name="l00065"></a>00065 <span class="preprocessor">#ifndef M_LOG2E</span><a name="l00066"></a>00066 <span class="preprocessor"></span><span class="preprocessor">#define M_LOG10E 0.43429448190325182765 </span><span class="comment">/* log_10 e */</span><a name="l00067"></a>00067 <span class="preprocessor">#endif</span><a name="l00068"></a>00068 <span class="preprocessor"></span><a name="l00069"></a>00069 <span class="preprocessor">#ifndef M_LN2</span><a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#define M_LN2 0.69314718055994530942 </span><span class="comment">/* log_e 2 */</span><a name="l00071"></a>00071 <span class="preprocessor">#endif</span><a name="l00072"></a>00072 <span class="preprocessor"></span><a name="l00073"></a>00073 <span class="preprocessor">#ifndef M_LN10</span><a name="l00074"></a>00074 <span class="preprocessor"></span><span class="preprocessor">#define M_LN10 2.30258509299404568402 </span><span class="comment">/* log_e 10 */</span><a name="l00075"></a>00075 <span class="preprocessor">#endif</span><a name="l00076"></a>00076 <span class="preprocessor"></span><a name="l00077"></a>00077 <span class="preprocessor">#ifndef M_PI</span><a name="l00078"></a>00078 <span class="preprocessor"></span><span class="preprocessor">#define M_PI 3.14159265358979323846 </span><span class="comment">/* pi */</span><a name="l00079"></a>00079 <span class="preprocessor">#endif</span><a name="l00080"></a>00080 <span class="preprocessor"></span><a name="l00081"></a>00081 <span class="preprocessor">#ifndef M_PI_2</span><a name="l00082"></a>00082 <span class="preprocessor"></span><span class="preprocessor">#define M_PI_2 1.57079632679489661923 </span><span class="comment">/* pi/2 */</span><a name="l00083"></a>00083 <span class="preprocessor">#endif</span><a name="l00084"></a>00084 <span class="preprocessor"></span><a name="l00085"></a>00085 <span class="preprocessor">#ifndef M_PI_4</span><a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#define M_PI_4 0.78539816339744830962 </span><span class="comment">/* pi/4 */</span><a name="l00087"></a>00087 <span class="preprocessor">#endif</span><a name="l00088"></a>00088 <span class="preprocessor"></span><a name="l00089"></a>00089 <span class="preprocessor">#ifndef M_1_PI</span><a name="l00090"></a>00090 <span class="preprocessor"></span><span class="preprocessor">#define M_1_PI 0.31830988618379067154 </span><span class="comment">/* 1/pi */</span><a name="l00091"></a>00091 <span class="preprocessor">#endif</span><a name="l00092"></a>00092 <span class="preprocessor"></span><a name="l00093"></a>00093 <span class="preprocessor">#ifndef M_2_PI</span><a name="l00094"></a>00094 <span class="preprocessor"></span><span class="preprocessor">#define M_2_PI 0.63661977236758134308 </span><span class="comment">/* 2/pi */</span><a name="l00095"></a>00095 <span class="preprocessor">#endif</span><a name="l00096"></a>00096 <span class="preprocessor"></span><a name="l00097"></a>00097 <span class="preprocessor">#ifndef M_2_SQRTPI</span><a name="l00098"></a>00098 <span class="preprocessor"></span><span class="preprocessor">#define M_2_SQRTPI 1.12837916709551257390 </span><span class="comment">/* 2/sqrt(pi) */</span><a name="l00099"></a>00099 <span class="preprocessor">#endif</span><a name="l00100"></a>00100 <span class="preprocessor"></span><a name="l00101"></a>00101 <span class="preprocessor">#ifndef M_SQRT2</span><a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#define M_SQRT2 1.41421356237309504880 </span><span class="comment">/* sqrt(2) */</span><a name="l00103"></a>00103 <span class="preprocessor">#endif</span><a name="l00104"></a>00104 <span class="preprocessor"></span><a name="l00105"></a>00105 <span class="preprocessor">#ifndef M_SQRT1_2</span><a name="l00106"></a>00106 <span class="preprocessor"></span><span class="preprocessor">#define M_SQRT1_2 0.70710678118654752440 </span><span class="comment">/* 1/sqrt(2) */</span><a name="l00107"></a>00107 <span class="preprocessor">#endif</span><a name="l00108"></a>00108 <span class="preprocessor"></span><a name="l00109"></a>00109 QWT_EXPORT <span class="keywordtype">double</span> qwtGetMin(<span class="keyword">const</span> <span class="keywordtype">double</span> *array, <span class="keywordtype">int</span> size);<a name="l00110"></a>00110 QWT_EXPORT <span class="keywordtype">double</span> qwtGetMax(<span class="keyword">const</span> <span class="keywordtype">double</span> *array, <span class="keywordtype">int</span> size);<a name="l00111"></a>00111 <a name="l00112"></a>00112 <a name="l00114"></a>00114 <span class="keyword">inline</span> <span class="keywordtype">int</span> qwtSign(<span class="keywordtype">double</span> x)<a name="l00115"></a>00115 {<a name="l00116"></a>00116 <span class="keywordflow">if</span> (x > 0.0)<a name="l00117"></a>00117 <span class="keywordflow">return</span> 1;<a name="l00118"></a>00118 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x < 0.0)<a name="l00119"></a>00119 <span class="keywordflow">return</span> (-1);<a name="l00120"></a>00120 <span class="keywordflow">else</span><a name="l00121"></a>00121 <span class="keywordflow">return</span> 0;<a name="l00122"></a>00122 } <a name="l00123"></a>00123 <a name="l00125"></a>00125 <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtSqr(<span class="keyword">const</span> <span class="keywordtype">double</span> x)<a name="l00126"></a>00126 {<a name="l00127"></a>00127 <span class="keywordflow">return</span> x*x;<a name="l00128"></a>00128 }<a name="l00129"></a>00129 <a name="l00136"></a>00136 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00137"></a>00137 T qwtLim(<span class="keyword">const</span> T& x, <span class="keyword">const</span> T& x1, <span class="keyword">const</span> T& x2)<a name="l00138"></a>00138 {<a name="l00139"></a>00139 T rv;<a name="l00140"></a>00140 T xmin, xmax;<a name="l00141"></a>00141 <a name="l00142"></a>00142 xmin = qwtMin(x1, x2);<a name="l00143"></a>00143 xmax = qwtMax(x1, x2);<a name="l00144"></a>00144 <a name="l00145"></a>00145 <span class="keywordflow">if</span> ( x < xmin )<a name="l00146"></a>00146 rv = xmin;<a name="l00147"></a>00147 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( x > xmax )<a name="l00148"></a>00148 rv = xmax;<a name="l00149"></a>00149 <span class="keywordflow">else</span><a name="l00150"></a>00150 rv = x;<a name="l00151"></a>00151 <a name="l00152"></a>00152 <span class="keywordflow">return</span> rv;<a name="l00153"></a>00153 }<a name="l00154"></a>00154 <a name="l00155"></a>00155 <span class="keyword">inline</span> QPoint qwtPolar2Pos(<span class="keyword">const</span> QPoint &center,<a name="l00156"></a>00156 <span class="keywordtype">double</span> radius, <span class="keywordtype">double</span> angle)<a name="l00157"></a>00157 {<a name="l00158"></a>00158 <span class="keyword">const</span> <span class="keywordtype">double</span> x = center.x() + radius * cos(angle);<a name="l00159"></a>00159 <span class="keyword">const</span> <span class="keywordtype">double</span> y = center.y() - radius * sin(angle);<a name="l00160"></a>00160 <a name="l00161"></a>00161 <span class="keywordflow">return</span> QPoint(qRound(x), qRound(y));<a name="l00162"></a>00162 }<a name="l00163"></a>00163 <a name="l00164"></a>00164 <span class="keyword">inline</span> QPoint qwtDegree2Pos(<span class="keyword">const</span> QPoint &center,<a name="l00165"></a>00165 <span class="keywordtype">double</span> radius, <span class="keywordtype">double</span> angle)<a name="l00166"></a>00166 {<a name="l00167"></a>00167 <span class="keywordflow">return</span> qwtPolar2Pos(center, radius, angle / 180.0 * M_PI);<a name="l00168"></a>00168 }<a name="l00169"></a>00169 <a name="l00170"></a>00170 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Feb 26 21:22:37 2007 for Qwt User's Guide by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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