📄 qwt__spline_8cpp-source.html
字号:
<!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_spline.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_spline.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_spline.h"</span><a name="l00011"></a>00011 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00012"></a>00012 <span class="preprocessor">#include "qwt_array.h"</span><a name="l00013"></a>00013 <a name="l00014"></a>00014 <span class="keyword">class </span>QwtSpline::PrivateData<a name="l00015"></a>00015 {<a name="l00016"></a>00016 <span class="keyword">public</span>:<a name="l00017"></a>00017 PrivateData():<a name="l00018"></a>00018 <a class="code" href="class_qwt_spline.html#36442cbb781422e5b97ae242265dd4b4">splineType</a>(<a class="code" href="class_qwt_spline.html">QwtSpline</a>::Natural)<a name="l00019"></a>00019 {<a name="l00020"></a>00020 }<a name="l00021"></a>00021 <a name="l00022"></a>00022 <a class="code" href="class_qwt_spline.html#2bd2bda128f82acd596348eb8d64231c">QwtSpline::SplineType</a> <a class="code" href="class_qwt_spline.html#36442cbb781422e5b97ae242265dd4b4">splineType</a>;<a name="l00023"></a>00023 <a name="l00024"></a>00024 <span class="comment">// coefficient vectors</span><a name="l00025"></a>00025 QwtArray<double> a;<a name="l00026"></a>00026 QwtArray<double> b;<a name="l00027"></a>00027 QwtArray<double> c;<a name="l00028"></a>00028 <a name="l00029"></a>00029 <span class="comment">// control points</span><a name="l00030"></a>00030 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00031"></a>00031 <span class="preprocessor"></span> QwtArray<QwtDoublePoint> <a class="code" href="class_qwt_spline.html#14694e61052933921eda629062554d22">points</a>;<a name="l00032"></a>00032 <span class="preprocessor">#else</span><a name="l00033"></a>00033 <span class="preprocessor"></span> QPolygonF <a class="code" href="class_qwt_spline.html#14694e61052933921eda629062554d22">points</a>;<a name="l00034"></a>00034 <span class="preprocessor">#endif</span><a name="l00035"></a>00035 <span class="preprocessor"></span>};<a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00038"></a>00038 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">int</span> lookup(<span class="keywordtype">double</span> x, <span class="keyword">const</span> QwtArray<QwtDoublePoint> &values)<a name="l00039"></a>00039 <span class="preprocessor">#else</span><a name="l00040"></a>00040 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">int</span> lookup(<span class="keywordtype">double</span> x, <span class="keyword">const</span> QPolygonF &values)<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">#if 0</span><a name="l00044"></a>00044 <span class="preprocessor"></span><span class="comment">//qLowerBiund/qHigherBound ???</span><a name="l00045"></a>00045 <span class="preprocessor">#endif</span><a name="l00046"></a>00046 <span class="preprocessor"></span> <span class="keywordtype">int</span> i1;<a name="l00047"></a>00047 <span class="keyword">const</span> <span class="keywordtype">int</span> size = (int)values.size();<a name="l00048"></a>00048 <a name="l00049"></a>00049 <span class="keywordflow">if</span> (x <= values[0].x())<a name="l00050"></a>00050 i1 = 0;<a name="l00051"></a>00051 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x >= values[size - 2].x())<a name="l00052"></a>00052 i1 = size - 2;<a name="l00053"></a>00053 <span class="keywordflow">else</span><a name="l00054"></a>00054 {<a name="l00055"></a>00055 i1 = 0;<a name="l00056"></a>00056 <span class="keywordtype">int</span> i2 = size - 2;<a name="l00057"></a>00057 <span class="keywordtype">int</span> i3 = 0;<a name="l00058"></a>00058 <a name="l00059"></a>00059 <span class="keywordflow">while</span> ( i2 - i1 > 1 )<a name="l00060"></a>00060 {<a name="l00061"></a>00061 i3 = i1 + ((i2 - i1) >> 1);<a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="keywordflow">if</span> (values[i3].x() > x)<a name="l00064"></a>00064 i2 = i3;<a name="l00065"></a>00065 <span class="keywordflow">else</span><a name="l00066"></a>00066 i1 = i3;<a name="l00067"></a>00067 }<a name="l00068"></a>00068 }<a name="l00069"></a>00069 <span class="keywordflow">return</span> i1;<a name="l00070"></a>00070 }<a name="l00071"></a>00071 <a name="l00073"></a><a class="code" href="class_qwt_spline.html#5d1e0ba35c637a88c66d9e4cbaf36e93">00073</a> <a class="code" href="class_qwt_spline.html#5d1e0ba35c637a88c66d9e4cbaf36e93">QwtSpline::QwtSpline</a>()<a name="l00074"></a>00074 {<a name="l00075"></a>00075 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a> = <span class="keyword">new</span> PrivateData;<a name="l00076"></a>00076 }<a name="l00077"></a>00077 <a name="l00078"></a><a class="code" href="class_qwt_spline.html#2e42391f76d0b3091bf7754239f3ff0d">00078</a> <a class="code" href="class_qwt_spline.html#5d1e0ba35c637a88c66d9e4cbaf36e93">QwtSpline::QwtSpline</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_spline.html">QwtSpline</a>& other)<a name="l00079"></a>00079 {<a name="l00080"></a>00080 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a> = <span class="keyword">new</span> PrivateData(*other.<a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>);<a name="l00081"></a>00081 }<a name="l00082"></a>00082 <a name="l00083"></a><a class="code" href="class_qwt_spline.html#8a597c34477dd4b5298db2d445b4e596">00083</a> <a class="code" href="class_qwt_spline.html">QwtSpline</a> &<a class="code" href="class_qwt_spline.html#8a597c34477dd4b5298db2d445b4e596">QwtSpline::operator=</a>( <span class="keyword">const</span> <a class="code" href="class_qwt_spline.html">QwtSpline</a> &other)<a name="l00084"></a>00084 {<a name="l00085"></a>00085 *<a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a> = *other.<a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>;<a name="l00086"></a>00086 <span class="keywordflow">return</span> *<span class="keyword">this</span>;<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00090"></a><a class="code" href="class_qwt_spline.html#90805882826469c94fdc871f18261bb6">00090</a> <a class="code" href="class_qwt_spline.html#90805882826469c94fdc871f18261bb6">QwtSpline::~QwtSpline</a>()<a name="l00091"></a>00091 {<a name="l00092"></a>00092 <span class="keyword">delete</span> <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>;<a name="l00093"></a>00093 }<a name="l00094"></a>00094 <a name="l00095"></a><a class="code" href="class_qwt_spline.html#222953661f01658a16042d587196aff8">00095</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_spline.html#222953661f01658a16042d587196aff8">QwtSpline::setSplineType</a>(<a class="code" href="class_qwt_spline.html#2bd2bda128f82acd596348eb8d64231c">SplineType</a> splineType)<a name="l00096"></a>00096 {<a name="l00097"></a>00097 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->splineType = splineType;<a name="l00098"></a>00098 }<a name="l00099"></a>00099 <a name="l00100"></a><a class="code" href="class_qwt_spline.html#36442cbb781422e5b97ae242265dd4b4">00100</a> <a class="code" href="class_qwt_spline.html#2bd2bda128f82acd596348eb8d64231c">QwtSpline::SplineType</a> <a class="code" href="class_qwt_spline.html#36442cbb781422e5b97ae242265dd4b4">QwtSpline::splineType</a>()<span class="keyword"> const</span><a name="l00101"></a>00101 <span class="keyword"></span>{<a name="l00102"></a>00102 <span class="keywordflow">return</span> <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->splineType;<a name="l00103"></a>00103 }<a name="l00104"></a>00104 <a name="l00106"></a>00106 <a name="l00123"></a>00123 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00124"></a>00124 <span class="preprocessor"></span><span class="keywordtype">bool</span> <a class="code" href="class_qwt_spline.html#6ed13410b1d5f6b33ba0e3c2b07932cf">QwtSpline::setPoints</a>(<span class="keyword">const</span> QwtArray<QwtDoublePoint>& points)<a name="l00125"></a>00125 <span class="preprocessor">#else</span><a name="l00126"></a><a class="code" href="class_qwt_spline.html#6ed13410b1d5f6b33ba0e3c2b07932cf">00126</a> <span class="preprocessor"></span><span class="keywordtype">bool</span> <a class="code" href="class_qwt_spline.html#6ed13410b1d5f6b33ba0e3c2b07932cf">QwtSpline::setPoints</a>(<span class="keyword">const</span> QPolygonF& points)<a name="l00127"></a>00127 <span class="preprocessor">#endif</span><a name="l00128"></a>00128 <span class="preprocessor"></span>{<a name="l00129"></a>00129 <span class="keyword">const</span> <span class="keywordtype">int</span> size = points.size();<a name="l00130"></a>00130 <span class="keywordflow">if</span> (size <= 2) <a name="l00131"></a>00131 {<a name="l00132"></a>00132 reset();<a name="l00133"></a>00133 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00134"></a>00134 }<a name="l00135"></a>00135 <a name="l00136"></a>00136 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00137"></a>00137 <span class="preprocessor"></span> d_data->points = points.copy(); <span class="comment">// Qt3: deep copy</span><a name="l00138"></a>00138 <span class="preprocessor">#else</span><a name="l00139"></a>00139 <span class="preprocessor"></span> d_data->points = points;<a name="l00140"></a>00140 <span class="preprocessor">#endif</span><a name="l00141"></a>00141 <span class="preprocessor"></span> <a name="l00142"></a>00142 d_data->a.resize(size-1);<a name="l00143"></a>00143 d_data->b.resize(size-1);<a name="l00144"></a>00144 d_data->c.resize(size-1);<a name="l00145"></a>00145 <a name="l00146"></a>00146 <span class="keywordtype">bool</span> ok;<a name="l00147"></a>00147 <span class="keywordflow">if</span> ( d_data->splineType == Periodic )<a name="l00148"></a>00148 ok = buildPeriodicSpline(points);<a name="l00149"></a>00149 <span class="keywordflow">else</span><a name="l00150"></a>00150 ok = buildNaturalSpline(points);<a name="l00151"></a>00151 <a name="l00152"></a>00152 <span class="keywordflow">if</span> (!ok) <a name="l00153"></a>00153 reset();<a name="l00154"></a>00154 <a name="l00155"></a>00155 <span class="keywordflow">return</span> ok;<a name="l00156"></a>00156 }<a name="l00157"></a>00157 <a name="l00161"></a>00161 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00162"></a>00162 <span class="preprocessor"></span>QwtArray<QwtDoublePoint> <a class="code" href="class_qwt_spline.html#14694e61052933921eda629062554d22">QwtSpline::points</a>() const<a name="l00163"></a>00163 <span class="preprocessor">#else</span><a name="l00164"></a><a class="code" href="class_qwt_spline.html#14694e61052933921eda629062554d22">00164</a> <span class="preprocessor"></span>QPolygonF <a class="code" href="class_qwt_spline.html#14694e61052933921eda629062554d22">QwtSpline::points</a>() const<a name="l00165"></a>00165 <span class="preprocessor">#endif</span><a name="l00166"></a>00166 <span class="preprocessor"></span>{<a name="l00167"></a>00167 <span class="keywordflow">return</span> d_data->points;<a name="l00168"></a>00168 }<a name="l00169"></a>00169 <a name="l00170"></a>00170 <a name="l00172"></a><a class="code" href="class_qwt_spline.html#fc52fd49e7f00d57a0336059fae299c0">00172</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_spline.html#fc52fd49e7f00d57a0336059fae299c0">QwtSpline::reset</a>()<a name="l00173"></a>00173 {<a name="l00174"></a>00174 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->a.resize(0);<a name="l00175"></a>00175 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->b.resize(0);<a name="l00176"></a>00176 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->c.resize(0);<a name="l00177"></a>00177 <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->points.resize(0);<a name="l00178"></a>00178 }<a name="l00179"></a>00179 <a name="l00181"></a><a class="code" href="class_qwt_spline.html#8eb42cf7f0f81bb7b7b885466f8ebbbf">00181</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_spline.html#8eb42cf7f0f81bb7b7b885466f8ebbbf">QwtSpline::isValid</a>()<span class="keyword"> const</span><a name="l00182"></a>00182 <span class="keyword"></span>{<a name="l00183"></a>00183 <span class="keywordflow">return</span> <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->a.size() > 0;<a name="l00184"></a>00184 }<a name="l00185"></a>00185 <a name="l00190"></a><a class="code" href="class_qwt_spline.html#1f67187eefe2959f0c902532edf64d41">00190</a> <span class="keywordtype">double</span> <a class="code" href="class_qwt_spline.html#1f67187eefe2959f0c902532edf64d41">QwtSpline::value</a>(<span class="keywordtype">double</span> x)<span class="keyword"> const</span><a name="l00191"></a>00191 <span class="keyword"></span>{<a name="l00192"></a>00192 <span class="keywordflow">if</span> (<a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->a.size() == 0)<a name="l00193"></a>00193 <span class="keywordflow">return</span> 0.0;<a name="l00194"></a>00194 <a name="l00195"></a>00195 <span class="keyword">const</span> <span class="keywordtype">int</span> i = lookup(x, <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->points);<a name="l00196"></a>00196 <a name="l00197"></a>00197 <span class="keyword">const</span> <span class="keywordtype">double</span> delta = x - <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->points[i].x();<a name="l00198"></a>00198 <span class="keywordflow">return</span>( ( ( ( <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->a[i] * delta) + <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->b[i] ) <a name="l00199"></a>00199 * delta + <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->c[i] ) * delta + <a class="code" href="class_qwt_spline.html#784545391f14c014684f391c6d92fd27">d_data</a>->points[i].y() );<a name="l00200"></a>00200 }⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -