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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_canvas.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_canvas.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="comment">// vim: expandtab</span><a name="l00011"></a>00011 <a name="l00012"></a>00012 <span class="preprocessor">#include <qpainter.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include <qstyle.h></span><a name="l00014"></a>00014 <span class="preprocessor">#if QT_VERSION >= 0x040000</span><a name="l00015"></a>00015 <span class="preprocessor"></span><span class="preprocessor">#include <qstyleoption.h></span><a name="l00016"></a>00016 <span class="preprocessor">#include <qpaintengine.h></span><a name="l00017"></a>00017 <span class="preprocessor">#ifdef Q_WS_X11</span><a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#include <qx11info_x11.h></span><a name="l00019"></a>00019 <span class="preprocessor">#endif</span><a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#endif</span><a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#include <qevent.h></span><a name="l00022"></a>00022 <span class="preprocessor">#include "qwt_painter.h"</span><a name="l00023"></a>00023 <span class="preprocessor">#include "qwt_math.h"</span><a name="l00024"></a>00024 <span class="preprocessor">#include "qwt_plot.h"</span><a name="l00025"></a>00025 <span class="preprocessor">#include "qwt_paint_buffer.h"</span><a name="l00026"></a>00026 <span class="preprocessor">#include "qwt_plot_canvas.h"</span><a name="l00027"></a>00027 <a name="l00028"></a>00028 <span class="keyword">class </span>QwtPlotCanvas::PrivateData<a name="l00029"></a>00029 {<a name="l00030"></a>00030 <span class="keyword">public</span>:<a name="l00031"></a>00031 PrivateData():<a name="l00032"></a>00032 <a class="code" href="class_qwt_plot_canvas.html#0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator</a>(NoFocusIndicator),<a name="l00033"></a>00033 paintAttributes(0),<a name="l00034"></a>00034 cache(NULL)<a name="l00035"></a>00035 {<a name="l00036"></a>00036 }<a name="l00037"></a>00037 <a name="l00038"></a>00038 ~PrivateData()<a name="l00039"></a>00039 {<a name="l00040"></a>00040 <span class="keyword">delete</span> cache;<a name="l00041"></a>00041 }<a name="l00042"></a>00042 <a name="l00043"></a>00043 <a class="code" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> <a class="code" href="class_qwt_plot_canvas.html#0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator</a>;<a name="l00044"></a>00044 <span class="keywordtype">int</span> paintAttributes;<a name="l00045"></a>00045 QPixmap *cache;<a name="l00046"></a>00046 };<a name="l00047"></a>00047 <a name="l00049"></a>00049 <a name="l00050"></a><a class="code" href="class_qwt_plot_canvas.html#e708ed2bc2fe614a809b9b70c9e8959e">00050</a> <a class="code" href="class_qwt_plot_canvas.html#e708ed2bc2fe614a809b9b70c9e8959e">QwtPlotCanvas::QwtPlotCanvas</a>(<a class="code" href="class_qwt_plot.html">QwtPlot</a> *plot):<a name="l00051"></a>00051 QFrame(plot)<a name="l00052"></a>00052 {<a name="l00053"></a>00053 d_data = <span class="keyword">new</span> PrivateData;<a name="l00054"></a>00054 <a name="l00055"></a>00055 <span class="preprocessor">#if QT_VERSION >= 0x040100</span><a name="l00056"></a>00056 <span class="preprocessor"></span> setAutoFillBackground(<span class="keyword">true</span>);<a name="l00057"></a>00057 <span class="preprocessor">#endif</span><a name="l00058"></a>00058 <span class="preprocessor"></span><a name="l00059"></a>00059 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00060"></a>00060 <span class="preprocessor"></span> setWFlags(Qt::WNoAutoErase);<a name="l00061"></a>00061 <span class="preprocessor">#ifndef QT_NO_CURSOR</span><a name="l00062"></a>00062 <span class="preprocessor"></span> setCursor(Qt::crossCursor);<a name="l00063"></a>00063 <span class="preprocessor">#endif</span><a name="l00064"></a>00064 <span class="preprocessor"></span><span class="preprocessor">#else</span><a name="l00065"></a>00065 <span class="preprocessor"></span><span class="preprocessor">#ifndef QT_NO_CURSOR</span><a name="l00066"></a>00066 <span class="preprocessor"></span> setCursor(Qt::CrossCursor);<a name="l00067"></a>00067 <span class="preprocessor">#endif</span><a name="l00068"></a>00068 <span class="preprocessor"></span><span class="preprocessor">#endif // >= 0x040000</span><a name="l00069"></a>00069 <span class="preprocessor"></span><a name="l00070"></a>00070 <a class="code" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">setPaintAttribute</a>(PaintCached, <span class="keyword">true</span>);<a name="l00071"></a>00071 <a class="code" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">setPaintAttribute</a>(PaintPacked, <span class="keyword">true</span>);<a name="l00072"></a>00072 }<a name="l00073"></a>00073 <a name="l00075"></a><a class="code" href="class_qwt_plot_canvas.html#320320bbb1b511c0c37fb2452a7f4404">00075</a> <a class="code" href="class_qwt_plot_canvas.html#320320bbb1b511c0c37fb2452a7f4404">QwtPlotCanvas::~QwtPlotCanvas</a>()<a name="l00076"></a>00076 {<a name="l00077"></a>00077 <span class="keyword">delete</span> d_data;<a name="l00078"></a>00078 }<a name="l00079"></a>00079 <a name="l00090"></a><a class="code" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">00090</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">QwtPlotCanvas::setPaintAttribute</a>(<a class="code" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">PaintAttribute</a> attribute, <span class="keywordtype">bool</span> on)<a name="l00091"></a>00091 {<a name="l00092"></a>00092 <span class="keywordflow">if</span> ( <span class="keywordtype">bool</span>(d_data->paintAttributes & attribute) == on )<a name="l00093"></a>00093 <span class="keywordflow">return</span>;<a name="l00094"></a>00094 <a name="l00095"></a>00095 <span class="keywordflow">if</span> ( on )<a name="l00096"></a>00096 d_data->paintAttributes |= attribute;<a name="l00097"></a>00097 <span class="keywordflow">else</span><a name="l00098"></a>00098 d_data->paintAttributes &= ~attribute;<a name="l00099"></a>00099 <a name="l00100"></a>00100 <span class="keywordflow">switch</span>(attribute)<a name="l00101"></a>00101 {<a name="l00102"></a>00102 <span class="keywordflow">case</span> PaintCached:<a name="l00103"></a>00103 {<a name="l00104"></a>00104 <span class="keywordflow">if</span> ( on )<a name="l00105"></a>00105 {<a name="l00106"></a>00106 <span class="keywordflow">if</span> ( d_data->cache == NULL )<a name="l00107"></a>00107 d_data->cache = <span class="keyword">new</span> QPixmap();<a name="l00108"></a>00108 <a name="l00109"></a>00109 <span class="keywordflow">if</span> ( isVisible() )<a name="l00110"></a>00110 {<a name="l00111"></a>00111 <span class="keyword">const</span> QRect cr = contentsRect();<a name="l00112"></a>00112 *d_data->cache = QPixmap::grabWidget(<span class="keyword">this</span>,<a name="l00113"></a>00113 cr.x(), cr.y(), cr.width(), cr.height() );<a name="l00114"></a>00114 }<a name="l00115"></a>00115 }<a name="l00116"></a>00116 <span class="keywordflow">else</span><a name="l00117"></a>00117 {<a name="l00118"></a>00118 <span class="keyword">delete</span> d_data->cache;<a name="l00119"></a>00119 d_data->cache = NULL;<a name="l00120"></a>00120 }<a name="l00121"></a>00121 <span class="keywordflow">break</span>;<a name="l00122"></a>00122 }<a name="l00123"></a>00123 <span class="keywordflow">case</span> PaintPacked:<a name="l00124"></a>00124 {<a name="l00125"></a>00125 <span class="comment">/*</span><a name="l00126"></a>00126 <span class="comment"> If not visible, changing of the background mode</span><a name="l00127"></a>00127 <span class="comment"> is delayed until it becomes visible. This tries to avoid </span><a name="l00128"></a>00128 <span class="comment"> looking through the canvas when the canvas is shown the first </span><a name="l00129"></a>00129 <span class="comment"> time.</span><a name="l00130"></a>00130 <span class="comment"> */</span><a name="l00131"></a>00131 <a name="l00132"></a>00132 <span class="keywordflow">if</span> ( on == <span class="keyword">false</span> || isVisible() )<a name="l00133"></a>00133 QwtPlotCanvas::setSystemBackground(!on);<a name="l00134"></a>00134 <a name="l00135"></a>00135 <span class="keywordflow">break</span>;<a name="l00136"></a>00136 }<a name="l00137"></a>00137 }<a name="l00138"></a>00138 }<a name="l00139"></a>00139 <a name="l00146"></a><a class="code" href="class_qwt_plot_canvas.html#804f78518b0ba72b11ba996fd2457fb1">00146</a> <span class="keywordtype">bool</span> <a class="code" href="class_qwt_plot_canvas.html#804f78518b0ba72b11ba996fd2457fb1">QwtPlotCanvas::testPaintAttribute</a>(<a class="code" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">PaintAttribute</a> attribute)<span class="keyword"> const</span><a name="l00147"></a>00147 <span class="keyword"></span>{<a name="l00148"></a>00148 <span class="keywordflow">return</span> (d_data->paintAttributes & attribute) != 0;<a name="l00149"></a>00149 }<a name="l00150"></a>00150 <a name="l00152"></a><a class="code" href="class_qwt_plot_canvas.html#9181564270ad961288f6651dcd08ad15">00152</a> QPixmap *<a class="code" href="class_qwt_plot_canvas.html#9181564270ad961288f6651dcd08ad15">QwtPlotCanvas::paintCache</a>()<a name="l00153"></a>00153 {<a name="l00154"></a>00154 <span class="keywordflow">return</span> d_data->cache;<a name="l00155"></a>00155 }<a name="l00156"></a>00156 <a name="l00158"></a><a class="code" href="class_qwt_plot_canvas.html#1f5bfe56b2c65bdb956cc0a9d805d1ae">00158</a> <span class="keyword">const</span> QPixmap *<a class="code" href="class_qwt_plot_canvas.html#9181564270ad961288f6651dcd08ad15">QwtPlotCanvas::paintCache</a>()<span class="keyword"> const</span><a name="l00159"></a>00159 <span class="keyword"></span>{<a name="l00160"></a>00160 <span class="keywordflow">return</span> d_data->cache;<a name="l00161"></a>00161 }<a name="l00162"></a>00162 <a name="l00164"></a><a class="code" href="class_qwt_plot_canvas.html#d03018bfc24f361e4ba359643c5c23b6">00164</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#d03018bfc24f361e4ba359643c5c23b6">QwtPlotCanvas::invalidatePaintCache</a>()<a name="l00165"></a>00165 {<a name="l00166"></a>00166 <span class="keywordflow">if</span> ( d_data->cache )<a name="l00167"></a>00167 *d_data->cache = QPixmap();<a name="l00168"></a>00168 }<a name="l00169"></a>00169 <a name="l00175"></a><a class="code" href="class_qwt_plot_canvas.html#e7330616dbb97128d01c5446ef0b006e">00175</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_canvas.html#e7330616dbb97128d01c5446ef0b006e">QwtPlotCanvas::setFocusIndicator</a>(<a class="code" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> focusIndicator)⌨️ 快捷键说明
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