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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_rasteritem.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_rasteritem.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 <qapplication.h></span><a name="l00011"></a>00011 <span class="preprocessor">#include <qdesktopwidget.h></span><a name="l00012"></a>00012 <span class="preprocessor">#include <qpaintdevice.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include <qpainter.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_scale_map.h"</span><a name="l00017"></a>00017 <span class="preprocessor">#include "qwt_plot_rasteritem.h"</span><a name="l00018"></a>00018 <a name="l00019"></a>00019 <span class="keyword">class </span>QwtPlotRasterItem::PrivateData<a name="l00020"></a>00020 {<a name="l00021"></a>00021 <span class="keyword">public</span>:<a name="l00022"></a>00022 PrivateData():<a name="l00023"></a>00023 <a class="code" href="class_qwt_plot_raster_item.html#96b2faa0bc0fe086bff1abe72bcb2016">alpha</a>(-1)<a name="l00024"></a>00024 {<a name="l00025"></a>00025 cache.policy = QwtPlotRasterItem::NoCache;<a name="l00026"></a>00026 }<a name="l00027"></a>00027 <a name="l00028"></a>00028 <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_raster_item.html#96b2faa0bc0fe086bff1abe72bcb2016">alpha</a>;<a name="l00029"></a>00029 <a name="l00030"></a>00030 <span class="keyword">struct </span>ImageCache<a name="l00031"></a>00031 {<a name="l00032"></a>00032 <a class="code" href="class_qwt_plot_raster_item.html#94929fc4c31c3dab75ee5adcac2d57b0">QwtPlotRasterItem::CachePolicy</a> policy;<a name="l00033"></a>00033 QwtDoubleRect rect;<a name="l00034"></a>00034 QSize size;<a name="l00035"></a>00035 QImage image;<a name="l00036"></a>00036 } cache;<a name="l00037"></a>00037 };<a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="keyword">static</span> QImage toRgba(<span class="keyword">const</span> QImage& image, <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_raster_item.html#96b2faa0bc0fe086bff1abe72bcb2016">alpha</a>)<a name="l00040"></a>00040 {<a name="l00041"></a>00041 <span class="keywordflow">if</span> ( alpha < 0 || alpha >= 255 ) <a name="l00042"></a>00042 <span class="keywordflow">return</span> image;<a name="l00043"></a>00043 <a name="l00044"></a>00044 <span class="preprocessor">#if QT_VERSION < 0x040000</span><a name="l00045"></a>00045 <span class="preprocessor"></span> QImage alphaImage(image.size(), 32);<a name="l00046"></a>00046 alphaImage.setAlphaBuffer(<span class="keyword">true</span>);<a name="l00047"></a>00047 <span class="preprocessor">#else</span><a name="l00048"></a>00048 <span class="preprocessor"></span> QImage alphaImage(image.size(), QImage::Format_ARGB32);<a name="l00049"></a>00049 <span class="preprocessor">#endif</span><a name="l00050"></a>00050 <span class="preprocessor"></span><a name="l00051"></a>00051 <span class="keyword">const</span> QRgb mask1 = qRgba(0, 0, 0, alpha);<a name="l00052"></a>00052 <span class="keyword">const</span> QRgb mask2 = qRgba(255, 255, 255, 0);<a name="l00053"></a>00053 <span class="keyword">const</span> QRgb mask3 = qRgba(0, 0, 0, 255);<a name="l00054"></a>00054 <a name="l00055"></a>00055 <span class="keyword">const</span> <span class="keywordtype">int</span> w = image.size().width();<a name="l00056"></a>00056 <span class="keyword">const</span> <span class="keywordtype">int</span> h = image.size().height();<a name="l00057"></a>00057 <a name="l00058"></a>00058 <span class="keywordflow">if</span> ( image.depth() == 8 )<a name="l00059"></a>00059 {<a name="l00060"></a>00060 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> y = 0; y < h; y++ )<a name="l00061"></a>00061 {<a name="l00062"></a>00062 QRgb* alphaLine = (QRgb*)alphaImage.scanLine(y);<a name="l00063"></a>00063 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *line = image.scanLine(y);<a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> x = 0; x < w; x++ )<a name="l00066"></a>00066 *alphaLine++ = (image.color(*line++) & mask2) | mask1;<a name="l00067"></a>00067 }<a name="l00068"></a>00068 }<a name="l00069"></a>00069 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( image.depth() == 32 )<a name="l00070"></a>00070 {<a name="l00071"></a>00071 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> y = 0; y < h; y++ )<a name="l00072"></a>00072 {<a name="l00073"></a>00073 QRgb* alphaLine = (QRgb*)alphaImage.scanLine(y);<a name="l00074"></a>00074 <span class="keyword">const</span> QRgb* line = (<span class="keyword">const</span> QRgb*) image.scanLine(y);<a name="l00075"></a>00075 <a name="l00076"></a>00076 <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> x = 0; x < w; x++ )<a name="l00077"></a>00077 {<a name="l00078"></a>00078 <span class="keyword">const</span> QRgb rgb = *line++;<a name="l00079"></a>00079 <span class="keywordflow">if</span> ( rgb & mask3 ) <span class="comment">// alpha != 0</span><a name="l00080"></a>00080 *alphaLine++ = (rgb & mask2) | mask1;<a name="l00081"></a>00081 <span class="keywordflow">else</span><a name="l00082"></a>00082 *alphaLine++ = rgb;<a name="l00083"></a>00083 }<a name="l00084"></a>00084 }<a name="l00085"></a>00085 }<a name="l00086"></a>00086 <a name="l00087"></a>00087 <span class="keywordflow">return</span> alphaImage;<a name="l00088"></a>00088 }<a name="l00089"></a>00089 <a name="l00091"></a><a class="code" href="class_qwt_plot_raster_item.html#2149c1d6b71c607027345a9a51ef3314">00091</a> <a class="code" href="class_qwt_plot_raster_item.html#2149c1d6b71c607027345a9a51ef3314">QwtPlotRasterItem::QwtPlotRasterItem</a>(<span class="keyword">const</span> QString& <a class="code" href="class_qwt_plot_item.html#3859d011b670b5f89e45d1ccef9206f7">title</a>):<a name="l00092"></a>00092 <a class="code" href="class_qwt_plot_item.html">QwtPlotItem</a>(<a class="code" href="class_qwt_text.html">QwtText</a>(title))<a name="l00093"></a>00093 {<a name="l00094"></a>00094 init();<a name="l00095"></a>00095 }<a name="l00096"></a>00096 <a name="l00098"></a><a class="code" href="class_qwt_plot_raster_item.html#f487c6abc8e95200d4537d1373f96be5">00098</a> <a class="code" href="class_qwt_plot_raster_item.html#2149c1d6b71c607027345a9a51ef3314">QwtPlotRasterItem::QwtPlotRasterItem</a>(<span class="keyword">const</span> <a class="code" href="class_qwt_text.html">QwtText</a>& title):<a name="l00099"></a>00099 <a class="code" href="class_qwt_plot_item.html">QwtPlotItem</a>(title)<a name="l00100"></a>00100 {<a name="l00101"></a>00101 init();<a name="l00102"></a>00102 }<a name="l00103"></a>00103 <a name="l00105"></a><a class="code" href="class_qwt_plot_raster_item.html#2715233827c346ab15504dc75d6e9714">00105</a> <a class="code" href="class_qwt_plot_raster_item.html#2715233827c346ab15504dc75d6e9714">QwtPlotRasterItem::~QwtPlotRasterItem</a>()<a name="l00106"></a>00106 {<a name="l00107"></a>00107 <span class="keyword">delete</span> d_data;<a name="l00108"></a>00108 }<a name="l00109"></a>00109 <a name="l00110"></a>00110 <span class="keywordtype">void</span> QwtPlotRasterItem::init()<a name="l00111"></a>00111 {<a name="l00112"></a>00112 d_data = <span class="keyword">new</span> PrivateData();<a name="l00113"></a>00113 <a name="l00114"></a>00114 <a class="code" href="class_qwt_plot_item.html#5a335be8ff488809a2cf7f4b734ad1b6">setItemAttribute</a>(QwtPlotItem::AutoScale, <span class="keyword">true</span>);<a name="l00115"></a>00115 <a class="code" href="class_qwt_plot_item.html#5a335be8ff488809a2cf7f4b734ad1b6">setItemAttribute</a>(QwtPlotItem::Legend, <span class="keyword">false</span>);<a name="l00116"></a>00116 <a name="l00117"></a>00117 <a class="code" href="class_qwt_plot_item.html#57d90e4146133b59d589c71b3a643e82">setZ</a>(8.0);<a name="l00118"></a>00118 }<a name="l00119"></a>00119 <a name="l00143"></a><a class="code" href="class_qwt_plot_raster_item.html#14f2ab8ec0994384e6269f869c352273">00143</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_raster_item.html#14f2ab8ec0994384e6269f869c352273">QwtPlotRasterItem::setAlpha</a>(<span class="keywordtype">int</span> alpha)<a name="l00144"></a>00144 {⌨️ 快捷键说明
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