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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_double_range.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_double_range.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_double_range.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00012"></a>00012 <a name="l00013"></a>00013 <span class="keyword">static</span> <span class="keywordtype">double</span> MinRelStep = 1.0e-10;<a name="l00014"></a>00014 <span class="keyword">static</span> <span class="keywordtype">double</span> DefaultRelStep = 1.0e-2;<a name="l00015"></a>00015 <span class="keyword">static</span> <span class="keywordtype">double</span> MinEps = 1.0e-10;<a name="l00016"></a>00016 <a name="l00021"></a><a class="code" href="class_qwt_double_range.html#86f9f76df03d7917d88a95d1667f2d72">00021</a> <a class="code" href="class_qwt_double_range.html#86f9f76df03d7917d88a95d1667f2d72">QwtDoubleRange::QwtDoubleRange</a>():<a name="l00022"></a>00022 d_minValue(0.0),<a name="l00023"></a>00023 d_maxValue(0.0),<a name="l00024"></a>00024 d_step(1.0),<a name="l00025"></a>00025 d_pageSize(1),<a name="l00026"></a>00026 d_isValid(false),<a name="l00027"></a>00027 d_value(0.0),<a name="l00028"></a>00028 d_exactValue(0.0),<a name="l00029"></a>00029 d_exactPrevValue(0.0),<a name="l00030"></a>00030 d_prevValue(0.0),<a name="l00031"></a>00031 d_periodic(false)<a name="l00032"></a>00032 {<a name="l00033"></a>00033 }<a name="l00034"></a>00034 <a name="l00036"></a><a class="code" href="class_qwt_double_range.html#bdcecda4b14ba81cfdaf063e2b98a22d">00036</a> <a class="code" href="class_qwt_double_range.html#bdcecda4b14ba81cfdaf063e2b98a22d">QwtDoubleRange::~QwtDoubleRange</a>()<a name="l00037"></a>00037 {<a name="l00038"></a>00038 }<a name="l00039"></a>00039 <a name="l00041"></a><a class="code" href="class_qwt_double_range.html#50a9c386663e170016a74cf8ee28ab8f">00041</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#50a9c386663e170016a74cf8ee28ab8f">QwtDoubleRange::setValid</a>(<span class="keywordtype">bool</span> isValid)<a name="l00042"></a>00042 {<a name="l00043"></a>00043 <span class="keywordflow">if</span> ( isValid != d_isValid )<a name="l00044"></a>00044 {<a name="l00045"></a>00045 d_isValid = isValid;<a name="l00046"></a>00046 <a class="code" href="class_qwt_double_range.html#1d50398342d6aa1d9cd86650ee29aff8">valueChange</a>();<a name="l00047"></a>00047 }<a name="l00048"></a>00048 }<a name="l00049"></a>00049 <a name="l00051"></a><a class="code" href="class_qwt_double_range.html#fc4921deb3f68a64cc08b0654a040bc6">00051</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_double_range.html#fc4921deb3f68a64cc08b0654a040bc6">QwtDoubleRange::isValid</a>()<span class="keyword"> const</span><a name="l00052"></a>00052 <span class="keyword"></span>{<a name="l00053"></a>00053 <span class="keywordflow">return</span> d_isValid;<a name="l00054"></a>00054 }<a name="l00055"></a>00055 <a name="l00064"></a>00064 <span class="keywordtype">void</span> QwtDoubleRange::setNewValue(<span class="keywordtype">double</span> x, <span class="keywordtype">bool</span> align)<a name="l00065"></a>00065 {<a name="l00066"></a>00066 <span class="keywordtype">double</span> vmin,vmax;<a name="l00067"></a>00067 <a name="l00068"></a>00068 d_prevValue = d_value;<a name="l00069"></a>00069 <a name="l00070"></a>00070 vmin = qwtMin(d_minValue, d_maxValue);<a name="l00071"></a>00071 vmax = qwtMax(d_minValue, d_maxValue);<a name="l00072"></a>00072 <a name="l00073"></a>00073 <span class="comment">// </span><a name="l00074"></a>00074 <span class="comment">// Range check</span><a name="l00075"></a>00075 <span class="comment">//</span><a name="l00076"></a>00076 <span class="keywordflow">if</span> (x < vmin)<a name="l00077"></a>00077 {<a name="l00078"></a>00078 <span class="keywordflow">if</span> ((d_periodic) && (vmin != vmax))<a name="l00079"></a>00079 d_value = x + ceil( (vmin - x) / (vmax - vmin ) ) <a name="l00080"></a>00080 * (vmax - vmin);<a name="l00081"></a>00081 <span class="keywordflow">else</span><a name="l00082"></a>00082 d_value = vmin;<a name="l00083"></a>00083 }<a name="l00084"></a>00084 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x > vmax)<a name="l00085"></a>00085 {<a name="l00086"></a>00086 <span class="keywordflow">if</span> ((d_periodic) && (vmin != vmax))<a name="l00087"></a>00087 d_value = x - ceil( ( x - vmax) / (vmax - vmin )) <a name="l00088"></a>00088 * (vmax - vmin);<a name="l00089"></a>00089 <span class="keywordflow">else</span><a name="l00090"></a>00090 d_value = vmax;<a name="l00091"></a>00091 }<a name="l00092"></a>00092 <span class="keywordflow">else</span><a name="l00093"></a>00093 d_value = x;<a name="l00094"></a>00094 <a name="l00095"></a>00095 d_exactPrevValue = d_exactValue;<a name="l00096"></a>00096 d_exactValue = d_value;<a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="comment">// align to grid</span><a name="l00099"></a>00099 <span class="keywordflow">if</span> (align)<a name="l00100"></a>00100 {<a name="l00101"></a>00101 <span class="keywordflow">if</span> (d_step != 0.0)<a name="l00102"></a>00102 d_value = d_minValue +<a name="l00103"></a>00103 qRound((d_value - d_minValue) / d_step) * d_step;<a name="l00104"></a>00104 <span class="keywordflow">else</span><a name="l00105"></a>00105 d_value = d_minValue;<a name="l00106"></a>00106 <a name="l00107"></a>00107 <span class="comment">// correct rounding error at the border</span><a name="l00108"></a>00108 <span class="keywordflow">if</span> (fabs(d_value - d_maxValue) < MinEps * qwtAbs(d_step))<a name="l00109"></a>00109 d_value = d_maxValue;<a name="l00110"></a>00110 <a name="l00111"></a>00111 <span class="comment">// correct rounding error if value = 0</span><a name="l00112"></a>00112 <span class="keywordflow">if</span> (fabs(d_value) < MinEps * qwtAbs(d_step))<a name="l00113"></a>00113 d_value = 0.0;<a name="l00114"></a>00114 }<a name="l00115"></a>00115 <a name="l00116"></a>00116 <span class="keywordflow">if</span> (!d_isValid || d_prevValue != d_value)<a name="l00117"></a>00117 {<a name="l00118"></a>00118 d_isValid = <span class="keyword">true</span>;<a name="l00119"></a>00119 <a class="code" href="class_qwt_double_range.html#1d50398342d6aa1d9cd86650ee29aff8">valueChange</a>();<a name="l00120"></a>00120 }<a name="l00121"></a>00121 }<a name="l00122"></a>00122 <a name="l00132"></a><a class="code" href="class_qwt_double_range.html#63bc8ea5e7ecd776b7d32d21db1ea668">00132</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#63bc8ea5e7ecd776b7d32d21db1ea668">QwtDoubleRange::fitValue</a>(<span class="keywordtype">double</span> x)<a name="l00133"></a>00133 {<a name="l00134"></a>00134 setNewValue(x, <span class="keyword">true</span>);<a name="l00135"></a>00135 }<a name="l00136"></a>00136 <a name="l00137"></a>00137 <a name="l00147"></a><a class="code" href="class_qwt_double_range.html#f6a3aa74c970a2bef29f0c1af99720e8">00147</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#f6a3aa74c970a2bef29f0c1af99720e8">QwtDoubleRange::setValue</a>(<span class="keywordtype">double</span> x)<a name="l00148"></a>00148 {<a name="l00149"></a>00149 setNewValue(x, <span class="keyword">false</span>);<a name="l00150"></a>00150 }<a name="l00151"></a>00151 <a name="l00169"></a><a class="code" href="class_qwt_double_range.html#43891011664b74b8e5454763a3f5ff21">00169</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_double_range.html#43891011664b74b8e5454763a3f5ff21">QwtDoubleRange::setRange</a>(<span class="keywordtype">double</span> vmin, <span class="keywordtype">double</span> vmax, <span class="keywordtype">double</span> vstep, <span class="keywordtype">int</span> pageSize)<a name="l00170"></a>00170 {<a name="l00171"></a>00171 <span class="keywordtype">bool</span> rchg = ((d_maxValue != vmax) || (d_minValue != vmin));<a name="l00172"></a>00172 <a name="l00173"></a>00173 <span class="keywordflow">if</span> (rchg) ⌨️ 快捷键说明
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