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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_scale_engine.cpp 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_scale_engine.cpp</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">#include "qwt_math.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include "qwt_scale_map.h"</span><a name="l00012"></a>00012 <span class="preprocessor">#include "qwt_scale_engine.h"</span><a name="l00013"></a>00013 <a name="l00014"></a>00014 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> _eps = 1.0e-6;<a name="l00015"></a>00015 <a name="l00028"></a><a class="code" href="class_qwt_scale_arithmetic.html#6c6f982022550fba9ccee034f87461ce">00028</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_scale_arithmetic.html#6c6f982022550fba9ccee034f87461ce">QwtScaleArithmetic::compareEps</a>(<span class="keywordtype">double</span> value1, <span class="keywordtype">double</span> value2, <a name="l00029"></a>00029 <span class="keywordtype">double</span> intervalSize) <a name="l00030"></a>00030 {<a name="l00031"></a>00031 <span class="keyword">const</span> <span class="keywordtype">double</span> eps = qwtAbs(_eps * intervalSize);<a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="keywordflow">if</span> ( value2 - value1 > eps )<a name="l00034"></a>00034 <span class="keywordflow">return</span> -1;<a name="l00035"></a>00035 <a name="l00036"></a>00036 <span class="keywordflow">if</span> ( value1 - value2 > eps )<a name="l00037"></a>00037 <span class="keywordflow">return</span> 1;<a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="keywordflow">return</span> 0;<a name="l00040"></a>00040 }<a name="l00041"></a>00041 <a name="l00050"></a><a class="code" href="class_qwt_scale_arithmetic.html#86da4fc0928457d03201d8b520d7d816">00050</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_arithmetic.html#86da4fc0928457d03201d8b520d7d816">QwtScaleArithmetic::ceilEps</a>(<span class="keywordtype">double</span> value, <a name="l00051"></a>00051 <span class="keywordtype">double</span> intervalSize) <a name="l00052"></a>00052 {<a name="l00053"></a>00053 <span class="keyword">const</span> <span class="keywordtype">double</span> eps = _eps * intervalSize;<a name="l00054"></a>00054 <a name="l00055"></a>00055 value = (value - eps) / intervalSize;<a name="l00056"></a>00056 <span class="keywordflow">return</span> ceil(value) * intervalSize;<a name="l00057"></a>00057 }<a name="l00058"></a>00058 <a name="l00067"></a><a class="code" href="class_qwt_scale_arithmetic.html#924d97f2e5db236f43f4d65e430e09c1">00067</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_arithmetic.html#924d97f2e5db236f43f4d65e430e09c1">QwtScaleArithmetic::floorEps</a>(<span class="keywordtype">double</span> value, <span class="keywordtype">double</span> intervalSize) <a name="l00068"></a>00068 {<a name="l00069"></a>00069 <span class="keyword">const</span> <span class="keywordtype">double</span> eps = _eps * intervalSize;<a name="l00070"></a>00070 <a name="l00071"></a>00071 value = (value + eps) / intervalSize;<a name="l00072"></a>00072 <span class="keywordflow">return</span> floor(value) * intervalSize;<a name="l00073"></a>00073 }<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="comment">/*</span><a name="l00076"></a>00076 <span class="comment"> \brief Divide an interval into steps</span><a name="l00077"></a>00077 <span class="comment"></span><a name="l00078"></a>00078 <span class="comment"> \f$stepSize = (intervalSize - intervalSize * 10e^{-6}) / numSteps\f$</span><a name="l00079"></a>00079 <span class="comment"></span><a name="l00080"></a>00080 <span class="comment"> \param intervalSize Interval size</span><a name="l00081"></a>00081 <span class="comment"> \param numSteps Number of steps</span><a name="l00082"></a>00082 <span class="comment"> \return Step size</span><a name="l00083"></a>00083 <span class="comment">*/</span><a name="l00084"></a><a class="code" href="class_qwt_scale_arithmetic.html#e5f0415105b2a97cccb93f3da9ddaead">00084</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_arithmetic.html#e5f0415105b2a97cccb93f3da9ddaead">QwtScaleArithmetic::divideEps</a>(<span class="keywordtype">double</span> intervalSize, <span class="keywordtype">double</span> numSteps) <a name="l00085"></a>00085 {<a name="l00086"></a>00086 <span class="keywordflow">if</span> ( numSteps == 0.0 || intervalSize == 0.0 )<a name="l00087"></a>00087 <span class="keywordflow">return</span> 0.0;<a name="l00088"></a>00088 <a name="l00089"></a>00089 <span class="keywordflow">return</span> (intervalSize - (_eps * intervalSize)) / numSteps;<a name="l00090"></a>00090 } <a name="l00091"></a>00091 <a name="l00098"></a><a class="code" href="class_qwt_scale_arithmetic.html#5768ab1c30f4fa8f02e3bb83f50fac02">00098</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_arithmetic.html#5768ab1c30f4fa8f02e3bb83f50fac02">QwtScaleArithmetic::ceil125</a>(<span class="keywordtype">double</span> x) <a name="l00099"></a>00099 {<a name="l00100"></a>00100 <span class="keywordflow">if</span> (x == 0.0) <a name="l00101"></a>00101 <span class="keywordflow">return</span> 0.0;<a name="l00102"></a>00102 <a name="l00103"></a>00103 <span class="keyword">const</span> <span class="keywordtype">double</span> sign = (x > 0) ? 1.0 : -1.0;<a name="l00104"></a>00104 <span class="keyword">const</span> <span class="keywordtype">double</span> lx = log10(fabs(x));<a name="l00105"></a>00105 <span class="keyword">const</span> <span class="keywordtype">double</span> p10 = floor(lx);<a name="l00106"></a>00106 <a name="l00107"></a>00107 <span class="keywordtype">double</span> fr = pow(10.0, lx - p10);<a name="l00108"></a>00108 <span class="keywordflow">if</span> (fr <=1.0)<a name="l00109"></a>00109 fr = 1.0; <a name="l00110"></a>00110 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fr <= 2.0)<a name="l00111"></a>00111 fr = 2.0;<a name="l00112"></a>00112 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fr <= 5.0) <a name="l00113"></a>00113 fr = 5.0;<a name="l00114"></a>00114 <span class="keywordflow">else</span><a name="l00115"></a>00115 fr = 10.0;<a name="l00116"></a>00116 <a name="l00117"></a>00117 <span class="keywordflow">return</span> sign * fr * pow(10.0, p10);<a name="l00118"></a>00118 }<a name="l00119"></a>00119 <a name="l00126"></a><a class="code" href="class_qwt_scale_arithmetic.html#0cf6b5993a700cf0f00175486bd57b5b">00126</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_arithmetic.html#0cf6b5993a700cf0f00175486bd57b5b">QwtScaleArithmetic::floor125</a>(<span class="keywordtype">double</span> x) <a name="l00127"></a>00127 {<a name="l00128"></a>00128 <span class="keywordflow">if</span> (x == 0.0)<a name="l00129"></a>00129 <span class="keywordflow">return</span> 0.0;<a name="l00130"></a>00130 <a name="l00131"></a>00131 <span class="keywordtype">double</span> sign = (x > 0) ? 1.0 : -1.0;<a name="l00132"></a>00132 <span class="keyword">const</span> <span class="keywordtype">double</span> lx = log10(fabs(x));<a name="l00133"></a>00133 <span class="keyword">const</span> <span class="keywordtype">double</span> p10 = floor(lx);<a name="l00134"></a>00134 <a name="l00135"></a>00135 <span class="keywordtype">double</span> fr = pow(10.0, lx - p10);<a name="l00136"></a>00136 <span class="keywordflow">if</span> (fr >= 10.0)<a name="l00137"></a>00137 fr = 10.0;<a name="l00138"></a>00138 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fr >= 5.0)<a name="l00139"></a>00139 fr = 5.0;<a name="l00140"></a>00140 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fr >= 2.0)<a name="l00141"></a>00141 fr = 2.0;<a name="l00142"></a>00142 <span class="keywordflow">else</span><a name="l00143"></a>00143 fr = 1.0;<a name="l00144"></a>00144 <a name="l00145"></a>00145 <span class="keywordflow">return</span> sign * fr * pow(10.0, p10);<a name="l00146"></a>00146 }<a name="l00147"></a>00147 <a name="l00148"></a>00148 <span class="keyword">class </span>QwtScaleEngine::PrivateData<a name="l00149"></a>00149 {<a name="l00150"></a>00150 <span class="keyword">public</span>:<a name="l00151"></a>00151 PrivateData():<a name="l00152"></a>00152 <a class="code" href="class_qwt_scale_engine.html#3e8d3101af3dbab7a97b96779118e428">attributes</a>(<a class="code" href="class_qwt_scale_engine.html">QwtScaleEngine</a>::NoAttribute),<a name="l00153"></a>00153 <a class="code" href="class_qwt_scale_engine.html#51447104ab614a157c2bac6a0f0f7dc9">loMargin</a>(0.0),<a name="l00154"></a>00154 <a class="code" href="class_qwt_scale_engine.html#a1e2d260975cef6546a3829213bc5f2f">hiMargin</a>(0.0),<a name="l00155"></a>00155 referenceValue(0.0)<a name="l00156"></a>00156 {<a name="l00157"></a>00157 }<a name="l00158"></a>00158 <a name="l00159"></a>00159 <span class="keywordtype">int</span> <a class="code" href="class_qwt_scale_engine.html#3e8d3101af3dbab7a97b96779118e428">attributes</a>; <span class="comment">// scale attributes</span><a name="l00160"></a>00160 <a name="l00161"></a>00161 <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_engine.html#51447104ab614a157c2bac6a0f0f7dc9">loMargin</a>; <span class="comment">// margins</span><a name="l00162"></a>00162 <span class="keywordtype">double</span> <a class="code" href="class_qwt_scale_engine.html#a1e2d260975cef6546a3829213bc5f2f">hiMargin</a>;<a name="l00163"></a>00163 <a name="l00164"></a>00164 <span class="keywordtype">double</span> referenceValue; <span class="comment">// reference value</span>⌨️ 快捷键说明
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