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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_plot_curve.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_plot_curve.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 <qpainter.h></span><a name="l00011"></a>00011 <span class="preprocessor">#include <qpixmap.h></span><a name="l00012"></a>00012 <span class="preprocessor">#include <qbitarray.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include "qwt_global.h"</span><a name="l00014"></a>00014 <span class="preprocessor">#include "qwt_legend.h"</span><a name="l00015"></a>00015 <span class="preprocessor">#include "qwt_legend_item.h"</span><a name="l00016"></a>00016 <span class="preprocessor">#include "qwt_data.h"</span><a name="l00017"></a>00017 <span class="preprocessor">#include "qwt_rect.h"</span><a name="l00018"></a>00018 <span class="preprocessor">#include "qwt_scale_map.h"</span><a name="l00019"></a>00019 <span class="preprocessor">#include "qwt_double_rect.h"</span><a name="l00020"></a>00020 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00021"></a>00021 <span class="preprocessor">#include "qwt_painter.h"</span><a name="l00022"></a>00022 <span class="preprocessor">#include "qwt_plot.h"</span><a name="l00023"></a>00023 <span class="preprocessor">#include "qwt_plot_canvas.h"</span><a name="l00024"></a>00024 <span class="preprocessor">#include "qwt_curve_fitter.h"</span><a name="l00025"></a>00025 <span class="preprocessor">#include "qwt_symbol.h"</span><a name="l00026"></a>00026 <span class="preprocessor">#include "qwt_plot_curve.h"</span><a name="l00027"></a>00027 <a name="l00028"></a>00028 <span class="preprocessor">#if QT_VERSION >= 0x040000</span><a name="l00029"></a>00029 <span class="preprocessor"></span><a name="l00030"></a>00030 <span class="preprocessor">#include <qevent.h></span><a name="l00031"></a>00031 <a name="l00032"></a>00032 <span class="keyword">class </span>QwtPlotCurvePaintHelper: <span class="keyword">public</span> QObject<a name="l00033"></a>00033 {<a name="l00034"></a>00034 <span class="keyword">public</span>:<a name="l00035"></a>00035 QwtPlotCurvePaintHelper(<span class="keyword">const</span> <a class="code" href="class_qwt_plot_curve.html">QwtPlotCurve</a> *curve, <span class="keywordtype">int</span> from, <span class="keywordtype">int</span> to):<a name="l00036"></a>00036 _curve(curve),<a name="l00037"></a>00037 _from(from),<a name="l00038"></a>00038 _to(to)<a name="l00039"></a>00039 {<a name="l00040"></a>00040 }<a name="l00041"></a>00041 <a name="l00042"></a>00042 <span class="keyword">virtual</span> <span class="keywordtype">bool</span> eventFilter(QObject *, QEvent *event)<a name="l00043"></a>00043 {<a name="l00044"></a>00044 <span class="keywordflow">if</span> ( event->type() == QEvent::Paint )<a name="l00045"></a>00045 {<a name="l00046"></a>00046 _curve->draw(_from, _to);<a name="l00047"></a>00047 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00048"></a>00048 }<a name="l00049"></a>00049 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00050"></a>00050 }<a name="l00051"></a>00051 <span class="keyword">private</span>:<a name="l00052"></a>00052 <span class="keyword">const</span> <a class="code" href="class_qwt_plot_curve.html">QwtPlotCurve</a> *_curve;<a name="l00053"></a>00053 <span class="keywordtype">int</span> _from;<a name="l00054"></a>00054 <span class="keywordtype">int</span> _to;<a name="l00055"></a>00055 };<a name="l00056"></a>00056 <a name="l00057"></a>00057 <span class="preprocessor">#endif // QT_VERSION >= 0x040000</span><a name="l00058"></a>00058 <span class="preprocessor"></span><a name="l00059"></a>00059 <span class="keyword">static</span> <span class="keywordtype">int</span> verifyRange(<span class="keywordtype">int</span> size, <span class="keywordtype">int</span> &i1, <span class="keywordtype">int</span> &i2)<a name="l00060"></a>00060 {<a name="l00061"></a>00061 <span class="keywordflow">if</span> (size < 1) <a name="l00062"></a>00062 <span class="keywordflow">return</span> 0;<a name="l00063"></a>00063 <a name="l00064"></a>00064 i1 = qwtLim(i1, 0, size-1);<a name="l00065"></a>00065 i2 = qwtLim(i2, 0, size-1);<a name="l00066"></a>00066 <a name="l00067"></a>00067 <span class="keywordflow">if</span> ( i1 > i2 )<a name="l00068"></a>00068 qSwap(i1, i2);<a name="l00069"></a>00069 <a name="l00070"></a>00070 <span class="keywordflow">return</span> (i2 - i1 + 1);<a name="l00071"></a>00071 }<a name="l00072"></a>00072 <a name="l00073"></a>00073 <span class="keyword">class </span>QwtPlotCurve::PrivateData<a name="l00074"></a>00074 {<a name="l00075"></a>00075 <span class="keyword">public</span>:<a name="l00076"></a>00076 <span class="keyword">class </span>PixelMatrix: <span class="keyword">private</span> QBitArray<a name="l00077"></a>00077 {<a name="l00078"></a>00078 <span class="keyword">public</span>:<a name="l00079"></a>00079 PixelMatrix(<span class="keyword">const</span> QRect& rect):<a name="l00080"></a>00080 QBitArray(rect.width() * rect.height()),<a name="l00081"></a>00081 _rect(rect)<a name="l00082"></a>00082 {<a name="l00083"></a>00083 fill(<span class="keyword">false</span>);<a name="l00084"></a>00084 }<a name="l00085"></a>00085 <a name="l00086"></a>00086 <span class="keyword">inline</span> <span class="keywordtype">bool</span> testPixel(<span class="keyword">const</span> QPoint& pos)<a name="l00087"></a>00087 {<a name="l00088"></a>00088 <span class="keywordflow">if</span> ( !_rect.contains(pos) )<a name="l00089"></a>00089 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00090"></a>00090 <a name="l00091"></a>00091 <span class="keyword">const</span> <span class="keywordtype">int</span> idx = _rect.width() * (pos.y() - _rect.y()) + <a name="l00092"></a>00092 (pos.x() - _rect.x());<a name="l00093"></a>00093 <a name="l00094"></a>00094 <span class="keyword">const</span> <span class="keywordtype">bool</span> marked = testBit(idx);<a name="l00095"></a>00095 <span class="keywordflow">if</span> ( !marked )<a name="l00096"></a>00096 setBit(idx, <span class="keyword">true</span>);<a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="keywordflow">return</span> !marked;<a name="l00099"></a>00099 }<a name="l00100"></a>00100 <a name="l00101"></a>00101 <span class="keyword">private</span>:<a name="l00102"></a>00102 QRect _rect;<a name="l00103"></a>00103 };<a name="l00104"></a>00104 <a name="l00105"></a>00105 PrivateData():<a name="l00106"></a>00106 <a class="code" href="class_qwt_plot_curve.html#203a29e61eda8434826a12f14db96255">curveType</a>(Yfx),<a name="l00107"></a>00107 <a class="code" href="class_qwt_plot_curve.html#2df43bdea2a17118c9114d6fa774e598">style</a>(<a class="code" href="class_qwt_plot_curve.html">QwtPlotCurve</a>::Lines),<a name="l00108"></a>00108 reference(0.0),<a name="l00109"></a>00109 attributes(0),<a name="l00110"></a>00110 paintAttributes(0)<a name="l00111"></a>00111 {<a name="l00112"></a>00112 <a class="code" href="class_qwt_plot_curve.html#778aafd1385ce833821751d0a8635cef">pen</a> = QPen(Qt::black, 0);<a name="l00113"></a>00113 <a class="code" href="class_qwt_plot_curve.html#af299522e4ad972996c781aacc940d31">curveFitter</a> = <span class="keyword">new</span> <a class="code" href="class_qwt_spline_curve_fitter.html">QwtSplineCurveFitter</a>;<a name="l00114"></a>00114 }<a name="l00115"></a>00115 <a name="l00116"></a>00116 ~PrivateData()<a name="l00117"></a>00117 {<a name="l00118"></a>00118 <span class="keyword">delete</span> <a class="code" href="class_qwt_plot_curve.html#af299522e4ad972996c781aacc940d31">curveFitter</a>;<a name="l00119"></a>00119 }<a name="l00120"></a>00120 <a name="l00121"></a>00121 <a class="code" href="class_qwt_plot_curve.html#c173d5059500d1c783602e33689714f5">QwtPlotCurve::CurveType</a> <a class="code" href="class_qwt_plot_curve.html#203a29e61eda8434826a12f14db96255">curveType</a>;<a name="l00122"></a>00122 <a class="code" href="class_qwt_plot_curve.html#15998aa80a11ba6ba80eebabaf773f70">QwtPlotCurve::CurveStyle</a> <a class="code" href="class_qwt_plot_curve.html#2df43bdea2a17118c9114d6fa774e598">style</a>;<a name="l00123"></a>00123 <span class="keywordtype">double</span> reference;<a name="l00124"></a>00124 <a name="l00125"></a>00125 <a class="code" href="class_qwt_symbol.html">QwtSymbol</a> sym;<a name="l00126"></a>00126 <a class="code" href="class_qwt_curve_fitter.html">QwtCurveFitter</a> *<a class="code" href="class_qwt_plot_curve.html#af299522e4ad972996c781aacc940d31">curveFitter</a>;<a name="l00127"></a>00127 <a name="l00128"></a>00128 QPen <a class="code" href="class_qwt_plot_curve.html#778aafd1385ce833821751d0a8635cef">pen</a>;<a name="l00129"></a>00129 QBrush <a class="code" href="class_qwt_plot_curve.html#72b678ebb8e4821c1f85351292ce5697">brush</a>;<a name="l00130"></a>00130 ⌨️ 快捷键说明
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