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  • Committer: Bazaar Package Importer
  • Author(s): Fathi Boudra
  • Date: 2009-04-12 23:25:58 UTC
  • mfrom: (1.1.4 upstream) (2.1.2 squeeze)
  • Revision ID: james.westby@ubuntu.com-20090412232558-3bl06x785yr8xm8u
Tags: 5.1.2-1
* New upstream release.
* Bump compat/debhelper to 7.
* Bump Standards-Version to 3.8.1. No changes needed.
* Invert Maintainers and Uploaders field.
* Fix lintian warnings:
  - dh_clean _k deprecated.
  - missing dependency on libc.

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qwt-5.1.2/doc/html/qwt__plot__rasteritem_8cpp-source.html
 
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20
<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>
 
21
<a name="l00002"></a>00002 <span class="comment"> * Qwt Widget Library</span>
 
22
<a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 1997   Josef Wilgen</span>
 
23
<a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2002   Uwe Rathmann</span>
 
24
<a name="l00005"></a>00005 <span class="comment"> *</span>
 
25
<a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
 
26
<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span>
 
27
<a name="l00008"></a>00008 <span class="comment"> *****************************************************************************/</span>
 
28
<a name="l00009"></a>00009 
 
29
<a name="l00010"></a>00010 <span class="preprocessor">#include &lt;qapplication.h&gt;</span>
 
30
<a name="l00011"></a>00011 <span class="preprocessor">#include &lt;qdesktopwidget.h&gt;</span>
 
31
<a name="l00012"></a>00012 <span class="preprocessor">#include &lt;qpaintdevice.h&gt;</span>
 
32
<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;qpainter.h&gt;</span>
 
33
<a name="l00014"></a>00014 <span class="preprocessor">#include "qwt_legend.h"</span>
 
34
<a name="l00015"></a>00015 <span class="preprocessor">#include "qwt_legend_item.h"</span>
 
35
<a name="l00016"></a>00016 <span class="preprocessor">#include "qwt_scale_map.h"</span>
 
36
<a name="l00017"></a>00017 <span class="preprocessor">#include "qwt_plot_rasteritem.h"</span>
 
37
<a name="l00018"></a>00018 
 
38
<a name="l00019"></a>00019 <span class="keyword">class </span>QwtPlotRasterItem::PrivateData
 
39
<a name="l00020"></a>00020 {
 
40
<a name="l00021"></a>00021 <span class="keyword">public</span>:
 
41
<a name="l00022"></a>00022     PrivateData():
 
42
<a name="l00023"></a>00023         <a class="code" href="class_qwt_plot_raster_item.html#6a8ee7f74861bf13335044810174bd3c">alpha</a>(-1)
 
43
<a name="l00024"></a>00024     {
 
44
<a name="l00025"></a>00025         cache.policy = QwtPlotRasterItem::NoCache;
 
45
<a name="l00026"></a>00026     }
 
46
<a name="l00027"></a>00027 
 
47
<a name="l00028"></a>00028     <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_raster_item.html#6a8ee7f74861bf13335044810174bd3c">alpha</a>;
 
48
<a name="l00029"></a>00029 
 
49
<a name="l00030"></a>00030     <span class="keyword">struct </span>ImageCache
 
50
<a name="l00031"></a>00031     {
 
51
<a name="l00032"></a>00032         <a class="code" href="class_qwt_plot_raster_item.html#94929fc4c31c3dab75ee5adcac2d57b0">QwtPlotRasterItem::CachePolicy</a> policy;
 
52
<a name="l00033"></a>00033         <a class="code" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> rect;
 
53
<a name="l00034"></a>00034         QSize size;
 
54
<a name="l00035"></a>00035         QImage image;
 
55
<a name="l00036"></a>00036     } cache;
 
56
<a name="l00037"></a>00037 };
 
57
<a name="l00038"></a>00038 
 
58
<a name="l00039"></a>00039 <span class="keyword">static</span> QImage toRgba(<span class="keyword">const</span> QImage&amp; image, <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_raster_item.html#6a8ee7f74861bf13335044810174bd3c">alpha</a>)
 
59
<a name="l00040"></a>00040 {
 
60
<a name="l00041"></a>00041     <span class="keywordflow">if</span> ( alpha &lt; 0 || alpha &gt;= 255 )  
 
61
<a name="l00042"></a>00042         <span class="keywordflow">return</span> image;
 
62
<a name="l00043"></a>00043 
 
63
<a name="l00044"></a>00044 <span class="preprocessor">#if QT_VERSION &lt; 0x040000</span>
 
64
<a name="l00045"></a>00045 <span class="preprocessor"></span>    QImage alphaImage(image.size(), 32);
 
65
<a name="l00046"></a>00046     alphaImage.setAlphaBuffer(<span class="keyword">true</span>);
 
66
<a name="l00047"></a>00047 <span class="preprocessor">#else</span>
 
67
<a name="l00048"></a>00048 <span class="preprocessor"></span>    QImage alphaImage(image.size(), QImage::Format_ARGB32);
 
68
<a name="l00049"></a>00049 <span class="preprocessor">#endif</span>
 
69
<a name="l00050"></a>00050 <span class="preprocessor"></span>
 
70
<a name="l00051"></a>00051     <span class="keyword">const</span> QRgb mask1 = qRgba(0, 0, 0, alpha);
 
71
<a name="l00052"></a>00052     <span class="keyword">const</span> QRgb mask2 = qRgba(255, 255, 255, 0);
 
72
<a name="l00053"></a>00053     <span class="keyword">const</span> QRgb mask3 = qRgba(0, 0, 0, 255);
 
73
<a name="l00054"></a>00054 
 
74
<a name="l00055"></a>00055     <span class="keyword">const</span> <span class="keywordtype">int</span> w = image.size().width();
 
75
<a name="l00056"></a>00056     <span class="keyword">const</span> <span class="keywordtype">int</span> h = image.size().height();
 
76
<a name="l00057"></a>00057 
 
77
<a name="l00058"></a>00058     <span class="keywordflow">if</span> ( image.depth() == 8 )
 
78
<a name="l00059"></a>00059     {
 
79
<a name="l00060"></a>00060         <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> y = 0; y &lt; h; y++ )
 
80
<a name="l00061"></a>00061         {
 
81
<a name="l00062"></a>00062             QRgb* alphaLine = (QRgb*)alphaImage.scanLine(y);
 
82
<a name="l00063"></a>00063             <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *line = image.scanLine(y);
 
83
<a name="l00064"></a>00064 
 
84
<a name="l00065"></a>00065             <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> x = 0; x &lt; w; x++ )
 
85
<a name="l00066"></a>00066                 *alphaLine++ = (image.color(*line++) &amp; mask2) | mask1;
 
86
<a name="l00067"></a>00067         }
 
87
<a name="l00068"></a>00068     }
 
88
<a name="l00069"></a>00069     <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( image.depth() == 32 )
 
89
<a name="l00070"></a>00070     {
 
90
<a name="l00071"></a>00071         <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> y = 0; y &lt; h; y++ )
 
91
<a name="l00072"></a>00072         {
 
92
<a name="l00073"></a>00073             QRgb* alphaLine = (QRgb*)alphaImage.scanLine(y);
 
93
<a name="l00074"></a>00074             <span class="keyword">const</span> QRgb* line = (<span class="keyword">const</span> QRgb*) image.scanLine(y);
 
94
<a name="l00075"></a>00075 
 
95
<a name="l00076"></a>00076             <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> x = 0; x &lt; w; x++ )
 
96
<a name="l00077"></a>00077             {
 
97
<a name="l00078"></a>00078                 <span class="keyword">const</span> QRgb rgb = *line++;
 
98
<a name="l00079"></a>00079                 <span class="keywordflow">if</span> ( rgb &amp; mask3 ) <span class="comment">// alpha != 0</span>
 
99
<a name="l00080"></a>00080                     *alphaLine++ = (rgb &amp; mask2) | mask1;
 
100
<a name="l00081"></a>00081                 <span class="keywordflow">else</span>
 
101
<a name="l00082"></a>00082                     *alphaLine++ = rgb;
 
102
<a name="l00083"></a>00083             }
 
103
<a name="l00084"></a>00084         }
 
104
<a name="l00085"></a>00085     }
 
105
<a name="l00086"></a>00086 
 
106
<a name="l00087"></a>00087     <span class="keywordflow">return</span> alphaImage;
 
107
<a name="l00088"></a>00088 }
 
108
<a name="l00089"></a>00089 
 
109
<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&amp; <a class="code" href="class_qwt_plot_item.html#3abdb947d71e457de120851922de3197">title</a>):
 
110
<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))
 
111
<a name="l00093"></a>00093 {
 
112
<a name="l00094"></a>00094     init();
 
113
<a name="l00095"></a>00095 }
 
114
<a name="l00096"></a>00096 
 
115
<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>&amp; title):
 
116
<a name="l00099"></a>00099     <a class="code" href="class_qwt_plot_item.html">QwtPlotItem</a>(title)
 
117
<a name="l00100"></a>00100 {
 
118
<a name="l00101"></a>00101     init();
 
119
<a name="l00102"></a>00102 }
 
120
<a name="l00103"></a>00103 
 
121
<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>()
 
122
<a name="l00106"></a>00106 {
 
123
<a name="l00107"></a>00107     <span class="keyword">delete</span> d_data;
 
124
<a name="l00108"></a>00108 }
 
125
<a name="l00109"></a>00109 
 
126
<a name="l00110"></a>00110 <span class="keywordtype">void</span> QwtPlotRasterItem::init()
 
127
<a name="l00111"></a>00111 {
 
128
<a name="l00112"></a>00112     d_data = <span class="keyword">new</span> PrivateData();
 
129
<a name="l00113"></a>00113 
 
130
<a name="l00114"></a>00114     <a class="code" href="class_qwt_plot_item.html#5a335be8ff488809a2cf7f4b734ad1b6">setItemAttribute</a>(QwtPlotItem::AutoScale, <span class="keyword">true</span>);
 
131
<a name="l00115"></a>00115     <a class="code" href="class_qwt_plot_item.html#5a335be8ff488809a2cf7f4b734ad1b6">setItemAttribute</a>(QwtPlotItem::Legend, <span class="keyword">false</span>);
 
132
<a name="l00116"></a>00116 
 
133
<a name="l00117"></a>00117     <a class="code" href="class_qwt_plot_item.html#57d90e4146133b59d589c71b3a643e82">setZ</a>(8.0);
 
134
<a name="l00118"></a>00118 }
 
135
<a name="l00119"></a>00119 
 
136
<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)
 
137
<a name="l00144"></a>00144 {
 
138
<a name="l00145"></a>00145     <span class="keywordflow">if</span> ( alpha &lt; 0 )
 
139
<a name="l00146"></a>00146         alpha = -1;
 
140
<a name="l00147"></a>00147 
 
141
<a name="l00148"></a>00148     <span class="keywordflow">if</span> ( alpha &gt; 255 )
 
142
<a name="l00149"></a>00149         alpha = 255;
 
143
<a name="l00150"></a>00150 
 
144
<a name="l00151"></a>00151     <span class="keywordflow">if</span> ( alpha != d_data-&gt;alpha )
 
145
<a name="l00152"></a>00152     {
 
146
<a name="l00153"></a>00153         d_data-&gt;alpha = alpha;
 
147
<a name="l00154"></a>00154 
 
148
<a name="l00155"></a>00155         <a class="code" href="class_qwt_plot_item.html#d956fdbce5b0721abccce6d09fe4d5ce">itemChanged</a>();
 
149
<a name="l00156"></a>00156     }
 
150
<a name="l00157"></a>00157 }
 
151
<a name="l00158"></a>00158 
 
152
<a name="l00163"></a><a class="code" href="class_qwt_plot_raster_item.html#6a8ee7f74861bf13335044810174bd3c">00163</a> <span class="keywordtype">int</span> <a class="code" href="class_qwt_plot_raster_item.html#6a8ee7f74861bf13335044810174bd3c">QwtPlotRasterItem::alpha</a>()<span class="keyword"> const</span>
 
153
<a name="l00164"></a>00164 <span class="keyword"></span>{
 
154
<a name="l00165"></a>00165     <span class="keywordflow">return</span> d_data-&gt;alpha;
 
155
<a name="l00166"></a>00166 }
 
156
<a name="l00167"></a>00167 
 
157
<a name="l00176"></a><a class="code" href="class_qwt_plot_raster_item.html#31f74199f7e333c2683b0f18289e4c7f">00176</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_raster_item.html#31f74199f7e333c2683b0f18289e4c7f">QwtPlotRasterItem::setCachePolicy</a>(
 
158
<a name="l00177"></a>00177     <a class="code" href="class_qwt_plot_raster_item.html#94929fc4c31c3dab75ee5adcac2d57b0">QwtPlotRasterItem::CachePolicy</a> policy)
 
159
<a name="l00178"></a>00178 {
 
160
<a name="l00179"></a>00179     <span class="keywordflow">if</span> ( d_data-&gt;cache.policy != policy )
 
161
<a name="l00180"></a>00180     {
 
162
<a name="l00181"></a>00181         d_data-&gt;cache.policy = policy;
 
163
<a name="l00182"></a>00182 
 
164
<a name="l00183"></a>00183         <a class="code" href="class_qwt_plot_raster_item.html#547ce4d8d031b230226cfbd509ef65b5">invalidateCache</a>();
 
165
<a name="l00184"></a>00184         <a class="code" href="class_qwt_plot_item.html#d956fdbce5b0721abccce6d09fe4d5ce">itemChanged</a>();
 
166
<a name="l00185"></a>00185     }
 
167
<a name="l00186"></a>00186 }
 
168
<a name="l00187"></a>00187 
 
169
<a name="l00192"></a><a class="code" href="class_qwt_plot_raster_item.html#ec74de65bf6b566afd52db6dc4c67c46">00192</a> <a class="code" href="class_qwt_plot_raster_item.html#94929fc4c31c3dab75ee5adcac2d57b0">QwtPlotRasterItem::CachePolicy</a> <a class="code" href="class_qwt_plot_raster_item.html#ec74de65bf6b566afd52db6dc4c67c46">QwtPlotRasterItem::cachePolicy</a>()<span class="keyword"> const</span>
 
170
<a name="l00193"></a>00193 <span class="keyword"></span>{
 
171
<a name="l00194"></a>00194     <span class="keywordflow">return</span> d_data-&gt;cache.policy;
 
172
<a name="l00195"></a>00195 }
 
173
<a name="l00196"></a>00196 
 
174
<a name="l00201"></a><a class="code" href="class_qwt_plot_raster_item.html#547ce4d8d031b230226cfbd509ef65b5">00201</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_raster_item.html#547ce4d8d031b230226cfbd509ef65b5">QwtPlotRasterItem::invalidateCache</a>()
 
175
<a name="l00202"></a>00202 {
 
176
<a name="l00203"></a>00203     d_data-&gt;cache.image = QImage();
 
177
<a name="l00204"></a>00204     d_data-&gt;cache.rect = <a class="code" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a>();
 
178
<a name="l00205"></a>00205     d_data-&gt;cache.size = QSize();
 
179
<a name="l00206"></a>00206 }
 
180
<a name="l00207"></a>00207 
 
181
<a name="l00217"></a><a class="code" href="class_qwt_plot_raster_item.html#b608eda9778ea870b07db2209e77cc3d">00217</a> QSize <a class="code" href="class_qwt_plot_raster_item.html#b608eda9778ea870b07db2209e77cc3d">QwtPlotRasterItem::rasterHint</a>(<span class="keyword">const</span> <a class="code" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> &amp;)<span class="keyword"> const</span>
 
182
<a name="l00218"></a>00218 <span class="keyword"></span>{
 
183
<a name="l00219"></a>00219     <span class="keywordflow">return</span> QSize();
 
184
<a name="l00220"></a>00220 }
 
185
<a name="l00221"></a>00221 
 
186
<a name="l00229"></a><a class="code" href="class_qwt_plot_raster_item.html#a8051353a68ab08b5962b0664e2c89d4">00229</a> <span class="keywordtype">void</span> <a class="code" href="class_qwt_plot_raster_item.html#a8051353a68ab08b5962b0664e2c89d4">QwtPlotRasterItem::draw</a>(QPainter *painter,
 
187
<a name="l00230"></a>00230     <span class="keyword">const</span> <a class="code" href="class_qwt_scale_map.html">QwtScaleMap</a> &amp;xMap, <span class="keyword">const</span> <a class="code" href="class_qwt_scale_map.html">QwtScaleMap</a> &amp;yMap,
 
188
<a name="l00231"></a>00231     <span class="keyword">const</span> QRect &amp;canvasRect)<span class="keyword"> const</span>
 
189
<a name="l00232"></a>00232 <span class="keyword"></span>{
 
190
<a name="l00233"></a>00233     <span class="keywordflow">if</span> ( canvasRect.isEmpty() || d_data-&gt;alpha == 0 )
 
191
<a name="l00234"></a>00234         <span class="keywordflow">return</span>;
 
192
<a name="l00235"></a>00235 
 
193
<a name="l00236"></a>00236     <a class="code" href="qwt__double__rect_8h.html#0c0dc4d33592fac4ad94734d8e9c4152">QwtDoubleRect</a> area = <a class="code" href="class_qwt_plot_item.html#01bc8299a1e06eac29907d717dede51a">invTransform</a>(xMap, yMap, canvasRect);
 
194
<a name="l00237"></a>00237     <span class="keywordflow">if</span> ( <a class="code" href="class_qwt_plot_item.html#aa0d61c721363671e1a1912cd4b8d4a7">boundingRect</a>().isValid() )
 
195
<a name="l00238"></a>00238         area &amp;= <a class="code" href="class_qwt_plot_item.html#aa0d61c721363671e1a1912cd4b8d4a7">boundingRect</a>();
 
196
<a name="l00239"></a>00239 
 
197
<a name="l00240"></a>00240     <span class="keyword">const</span> QRect <a class="code" href="class_qwt_plot_item.html#d0b1c45a2c0a6807a85e2201b99737f2">paintRect</a> = <a class="code" href="class_qwt_plot_item.html#9adba4c37682d216740c714d23e97b53">transform</a>(xMap, yMap, area);
 
198
<a name="l00241"></a>00241     <span class="keywordflow">if</span> ( !paintRect.isValid() )
 
199
<a name="l00242"></a>00242         <span class="keywordflow">return</span>;
 
200
<a name="l00243"></a>00243 
 
201
<a name="l00244"></a>00244     QImage image;
 
202
<a name="l00245"></a>00245 
 
203
<a name="l00246"></a>00246     <span class="keywordtype">bool</span> doCache = <span class="keyword">true</span>;
 
204
<a name="l00247"></a>00247     <span class="keywordflow">if</span> ( painter-&gt;device()-&gt;devType() == QInternal::Printer 
 
205
<a name="l00248"></a>00248             || painter-&gt;device()-&gt;devType() == QInternal::Picture )
 
206
<a name="l00249"></a>00249     {
 
207
<a name="l00250"></a>00250         doCache = <span class="keyword">false</span>;
 
208
<a name="l00251"></a>00251     }
 
209
<a name="l00252"></a>00252 
 
210
<a name="l00253"></a>00253     <span class="keywordflow">if</span> ( !doCache || d_data-&gt;cache.policy == NoCache )
 
211
<a name="l00254"></a>00254     {
 
212
<a name="l00255"></a>00255         image = <a class="code" href="class_qwt_plot_raster_item.html#934080bd84c334df24eb50ddfcc1e8db">renderImage</a>(xMap, yMap, area);
 
213
<a name="l00256"></a>00256         <span class="keywordflow">if</span> ( d_data-&gt;alpha &gt;= 0 &amp;&amp; d_data-&gt;alpha &lt; 255 )
 
214
<a name="l00257"></a>00257             image = toRgba(image, d_data-&gt;alpha);
 
215
<a name="l00258"></a>00258 
 
216
<a name="l00259"></a>00259     }
 
217
<a name="l00260"></a>00260     <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( d_data-&gt;cache.policy == PaintCache )
 
218
<a name="l00261"></a>00261     {
 
219
<a name="l00262"></a>00262         <span class="keywordflow">if</span> ( d_data-&gt;cache.image.isNull() || d_data-&gt;cache.rect != area
 
220
<a name="l00263"></a>00263             || d_data-&gt;cache.size != paintRect.size() )
 
221
<a name="l00264"></a>00264         {
 
222
<a name="l00265"></a>00265             d_data-&gt;cache.image = <a class="code" href="class_qwt_plot_raster_item.html#934080bd84c334df24eb50ddfcc1e8db">renderImage</a>(xMap, yMap, area);
 
223
<a name="l00266"></a>00266             d_data-&gt;cache.rect = area;
 
224
<a name="l00267"></a>00267             d_data-&gt;cache.size = paintRect.size();
 
225
<a name="l00268"></a>00268         }
 
226
<a name="l00269"></a>00269 
 
227
<a name="l00270"></a>00270         image = d_data-&gt;cache.image;
 
228
<a name="l00271"></a>00271         <span class="keywordflow">if</span> ( d_data-&gt;alpha &gt;= 0 &amp;&amp; d_data-&gt;alpha &lt; 255 )
 
229
<a name="l00272"></a>00272             image = toRgba(image, d_data-&gt;alpha);
 
230
<a name="l00273"></a>00273     }
 
231
<a name="l00274"></a>00274     <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( d_data-&gt;cache.policy == ScreenCache )
 
232
<a name="l00275"></a>00275     {
 
233
<a name="l00276"></a>00276         <span class="keyword">const</span> QSize screenSize =
 
234
<a name="l00277"></a>00277             QApplication::desktop()-&gt;screenGeometry().size();
 
235
<a name="l00278"></a>00278 
 
236
<a name="l00279"></a>00279         <span class="keywordflow">if</span> ( paintRect.width() &gt; screenSize.width() ||
 
237
<a name="l00280"></a>00280             paintRect.height() &gt; screenSize.height() )
 
238
<a name="l00281"></a>00281         {
 
239
<a name="l00282"></a>00282             image = <a class="code" href="class_qwt_plot_raster_item.html#934080bd84c334df24eb50ddfcc1e8db">renderImage</a>(xMap, yMap, area);
 
240
<a name="l00283"></a>00283         }
 
241
<a name="l00284"></a>00284         <span class="keywordflow">else</span>
 
242
<a name="l00285"></a>00285         {
 
243
<a name="l00286"></a>00286             <span class="keywordflow">if</span> ( d_data-&gt;cache.image.isNull() || d_data-&gt;cache.rect != area )
 
244
<a name="l00287"></a>00287             {
 
245
<a name="l00288"></a>00288                 <a class="code" href="class_qwt_scale_map.html">QwtScaleMap</a> cacheXMap = xMap;
 
246
<a name="l00289"></a>00289                 cacheXMap.<a class="code" href="class_qwt_scale_map.html#a9a63a0b2e4ff81b1df23d9f968cd5b8">setPaintInterval</a>( 0, screenSize.width());
 
247
<a name="l00290"></a>00290 
 
248
<a name="l00291"></a>00291                 <a class="code" href="class_qwt_scale_map.html">QwtScaleMap</a> cacheYMap = yMap;
 
249
<a name="l00292"></a>00292                 cacheYMap.<a class="code" href="class_qwt_scale_map.html#a9a63a0b2e4ff81b1df23d9f968cd5b8">setPaintInterval</a>(screenSize.height(), 0);
 
250
<a name="l00293"></a>00293 
 
251
<a name="l00294"></a>00294                 d_data-&gt;cache.image = <a class="code" href="class_qwt_plot_raster_item.html#934080bd84c334df24eb50ddfcc1e8db">renderImage</a>(
 
252
<a name="l00295"></a>00295                     cacheXMap, cacheYMap, area);
 
253
<a name="l00296"></a>00296                 d_data-&gt;cache.rect = area;
 
254
<a name="l00297"></a>00297                 d_data-&gt;cache.size = paintRect.size();
 
255
<a name="l00298"></a>00298             }
 
256
<a name="l00299"></a>00299 
 
257
<a name="l00300"></a>00300             image = d_data-&gt;cache.image;
 
258
<a name="l00301"></a>00301         }
 
259
<a name="l00302"></a>00302         image = toRgba(image, d_data-&gt;alpha);
 
260
<a name="l00303"></a>00303     }
 
261
<a name="l00304"></a>00304 
 
262
<a name="l00305"></a>00305     painter-&gt;drawImage(paintRect, image);
 
263
<a name="l00306"></a>00306 }
 
264
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Mar 22 16:54:08 2009 for Qwt User's Guide by&nbsp;
 
265
<a href="http://www.doxygen.org/index.html">
 
266
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.0 </small></address>
 
267
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268
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