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<h1 class="title">main.cpp Example File</h1>
<span class="small-subtitle">demos/glhypnotizer/main.cpp</span>
<!-- $$$demos/glhypnotizer/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include <QtOpenGL></span>
<span class="preprocessor">#include <QtSvg></span>
<span class="preprocessor">#define NUM_SWIRLY_ITEMS 10</span>
<span class="keyword">class</span> GLPainter : <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span>
{
Q_OBJECT
<span class="keyword">public</span>:
GLPainter(<span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>widget);
<span class="type">void</span> stop();
<span class="type">void</span> resizeViewport(<span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> <span class="operator">&</span>size);
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> start();
<span class="keyword">protected</span>:
<span class="type">void</span> timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event);
<span class="type">void</span> paint();
<span class="type">void</span> initSwirlyItems();
<span class="type">void</span> updateSwirlyItems();
<span class="type">void</span> drawSuggestiveMessages(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>p);
<span class="keyword">private</span>:
<span class="type"><a href="qmutex.html">QMutex</a></span> mutex;
<span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>glWidget;
<span class="type">int</span> viewportWidth;
<span class="type">int</span> viewportHeight;
<span class="type">bool</span> doRendering;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> rotationAngle;
<span class="type">bool</span> swirlClockwise;
<span class="type"><a href="qsvgrenderer.html">QSvgRenderer</a></span> svgRenderer;
<span class="type"><a href="qpixmap.html">QPixmap</a></span> logo;
<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>PixmapFragment swirlyItems<span class="operator">[</span>NUM_SWIRLY_ITEMS<span class="operator">]</span>;
<span class="type">int</span> swirlyCounter;
<span class="type">int</span> textCounter;
<span class="type">int</span> messageYPos;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> scaleFactor;
};
GLPainter<span class="operator">::</span>GLPainter(<span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>widget)
: glWidget(widget)
<span class="operator">,</span> doRendering(<span class="keyword">true</span>)
<span class="operator">,</span> rotationAngle(rand() <span class="operator">%</span> <span class="number">360</span>)
<span class="operator">,</span> swirlClockwise((rand() <span class="operator">%</span> <span class="number">2</span>) <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>)
<span class="operator">,</span> svgRenderer(QLatin1String(<span class="string">":/spiral.svg"</span>)<span class="operator">,</span> <span class="keyword">this</span>)
<span class="operator">,</span> logo(QLatin1String(<span class="string">":/qt-logo.png"</span>))
{
}
<span class="type">void</span> GLPainter<span class="operator">::</span>start()
{
glWidget<span class="operator">-</span><span class="operator">></span>makeCurrent();
startTimer(<span class="number">20</span>);
}
<span class="type">void</span> GLPainter<span class="operator">::</span>stop()
{
<span class="type"><a href="qmutexlocker.html">QMutexLocker</a></span> locker(<span class="operator">&</span>mutex);
doRendering <span class="operator">=</span> <span class="keyword">false</span>;
}
<span class="type">void</span> GLPainter<span class="operator">::</span>resizeViewport(<span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> <span class="operator">&</span>size)
{
<span class="type"><a href="qmutexlocker.html">QMutexLocker</a></span> locker(<span class="operator">&</span>mutex);
viewportWidth <span class="operator">=</span> size<span class="operator">.</span>width();
viewportHeight <span class="operator">=</span> size<span class="operator">.</span>height();
initSwirlyItems();
textCounter <span class="operator">=</span> <span class="number">0</span>;
messageYPos <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
}
<span class="type">void</span> GLPainter<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qmutexlocker.html">QMutexLocker</a></span> locker(<span class="operator">&</span>mutex);
<span class="keyword">if</span> (<span class="operator">!</span>doRendering) {
killTimer(event<span class="operator">-</span><span class="operator">></span>timerId());
<span class="type"><a href="qthread.html">QThread</a></span><span class="operator">::</span>currentThread()<span class="operator">-</span><span class="operator">></span>quit();
<span class="keyword">return</span>;
}
updateSwirlyItems();
paint();
}
<span class="type">void</span> GLPainter<span class="operator">::</span>paint()
{
<span class="type"><a href="qpainter.html">QPainter</a></span> p(glWidget);
p<span class="operator">.</span>fillRect(<span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> viewportWidth<span class="operator">,</span> viewportHeight)<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
p<span class="operator">.</span>setRenderHints(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing <span class="operator">|</span> <span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>SmoothPixmapTransform);
p<span class="operator">.</span>translate(viewportWidth <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> viewportHeight <span class="operator">/</span> <span class="number">2</span>);
p<span class="operator">.</span>rotate(rotationAngle <span class="operator">*</span> (swirlClockwise <span class="operator">?</span> <span class="number">1</span> : <span class="operator">-</span><span class="number">1</span>));
p<span class="operator">.</span>scale(svgRenderer<span class="operator">.</span>viewBox()<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">200.0</span> <span class="operator">*</span> <span class="number">0.65</span><span class="operator">,</span>
svgRenderer<span class="operator">.</span>viewBox()<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">200.0</span> <span class="operator">*</span> <span class="number">0.65</span>);
p<span class="operator">.</span>translate(<span class="operator">-</span>viewportWidth <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>viewportHeight <span class="operator">/</span> <span class="number">2</span>);
svgRenderer<span class="operator">.</span>render(<span class="operator">&</span>p);
p<span class="operator">.</span>resetTransform();
p<span class="operator">.</span>drawPixmapFragments(swirlyItems<span class="operator">,</span> NUM_SWIRLY_ITEMS<span class="operator">,</span> logo);
drawSuggestiveMessages(<span class="operator">&</span>p);
p<span class="operator">.</span>end();
rotationAngle <span class="operator">+</span><span class="operator">=</span> <span class="number">1.2</span>;
}
<span class="type">void</span> GLPainter<span class="operator">::</span>drawSuggestiveMessages(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>p)
{
<span class="keyword">const</span> <span class="type">int</span> numSuggestiveMessages <span class="operator">=</span> <span class="number">7</span>;
<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>texts<span class="operator">[</span>numSuggestiveMessages<span class="operator">]</span> <span class="operator">=</span> {<span class="string">" You feel relaxed.. "</span><span class="operator">,</span>
<span class="string">" Let your mind wander.. "</span><span class="operator">,</span>
<span class="string">" Look deep into the swirls.. "</span><span class="operator">,</span>
<span class="string">" Even deeper.. "</span><span class="operator">,</span>
<span class="string">" Qt is good! "</span><span class="operator">,</span>
<span class="string">" Qt is good for you! "</span><span class="operator">,</span>
<span class="string">" You MUST use Qt! "</span>};
<span class="type"><a href="qfont.html">QFont</a></span> font(p<span class="operator">-</span><span class="operator">></span>font());
font<span class="operator">.</span>setPointSizeF(font<span class="operator">.</span>pointSizeF() <span class="operator">*</span> viewportWidth<span class="operator">/</span><span class="number">200.0</span>);
p<span class="operator">-</span><span class="operator">></span>setFont(font);
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fm(font);
<span class="type">int</span> messageNo <span class="operator">=</span> textCounter<span class="operator">/</span><span class="number">314</span>;
<span class="keyword">if</span> (messageNo <span class="operator">></span> <span class="number">6</span> <span class="operator">|</span><span class="operator">|</span> messageNo <span class="operator"><</span> <span class="number">0</span>) {
<a href="qtglobal.html#qFatal">qFatal</a>(<span class="string">"This should not happen: %d - %d"</span><span class="operator">,</span> messageNo<span class="operator">,</span> textCounter);
}
QLatin1String text(texts<span class="operator">[</span>textCounter <span class="operator">/</span> <span class="number">314</span><span class="operator">]</span>);
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> textWidth <span class="operator">=</span> fm<span class="operator">.</span>width(text);
<span class="type">int</span> alpha <span class="operator">=</span> <span class="number">255</span> <span class="operator">*</span> <a href="qtglobal.html#qAbs">qAbs</a>(<a href="qtcore-qmath-h.html#qSin">qSin</a>(textCounter <span class="operator">*</span> <span class="number">0.01</span>));
<span class="keyword">if</span> (messageYPos <span class="operator"><</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> (textCounter <span class="operator">%</span> <span class="number">314</span> <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)) {
messageYPos <span class="operator">=</span> <a href="qtglobal.html#qBound">qBound</a>(fm<span class="operator">.</span>height()<span class="operator">,</span> rand() <span class="operator">%</span> viewportHeight<span class="operator">,</span>
viewportHeight <span class="operator">-</span> fm<span class="operator">.</span>height());
}
p<span class="operator">-</span><span class="operator">></span>setPen(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> alpha));
p<span class="operator">-</span><span class="operator">></span>setBackground(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <a href="qtglobal.html#qBound">qBound</a>(<span class="number">0</span><span class="operator">,</span> alpha<span class="operator">,</span> <span class="number">50</span>)));
p<span class="operator">-</span><span class="operator">></span>setBackgroundMode(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>OpaqueMode);
p<span class="operator">-</span><span class="operator">></span>drawText((viewportWidth <span class="operator">/</span> <span class="number">2</span>) <span class="operator">-</span> (textWidth<span class="operator">/</span> <span class="number">2</span>)<span class="operator">,</span> messageYPos<span class="operator">,</span> text);
<span class="operator">+</span><span class="operator">+</span>textCounter;
<span class="keyword">if</span> (textCounter <span class="operator">></span><span class="operator">=</span> (<span class="number">314</span> <span class="operator">*</span> numSuggestiveMessages))
textCounter <span class="operator">=</span> <span class="number">0</span>;
}
<span class="type">void</span> GLPainter<span class="operator">::</span>initSwirlyItems()
{
swirlyCounter <span class="operator">=</span> swirlClockwise <span class="operator">?</span> <span class="number">0</span> : <span class="number">360</span>;
scaleFactor <span class="operator">=</span> viewportWidth <span class="operator">/</span> <span class="number">200.0</span>;
<span class="type"><a href="qrectf.html">QRectF</a></span> logoRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> logo<span class="operator">.</span>width()<span class="operator">,</span> logo<span class="operator">.</span>height());
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>NUM_SWIRLY_ITEMS; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (swirlClockwise) {
swirlyItems<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>PixmapFragment<span class="operator">::</span>create(<span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> logoRect<span class="operator">,</span>
scaleFactor<span class="operator">,</span>
scaleFactor);
} <span class="keyword">else</span> {
swirlyItems<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>PixmapFragment<span class="operator">::</span>create(<span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> logoRect<span class="operator">,</span>
scaleFactor <span class="operator">*</span> <span class="number">1</span> <span class="operator">/</span> <span class="number">360.0</span><span class="operator">,</span>
scaleFactor <span class="operator">*</span> <span class="number">1</span> <span class="operator">/</span> <span class="number">360.0</span>);
}
}
}
<span class="type">void</span> GLPainter<span class="operator">::</span>updateSwirlyItems()
{
swirlyCounter <span class="operator">+</span><span class="operator">=</span> swirlClockwise <span class="operator">?</span> <span class="number">1</span> : <span class="operator">-</span><span class="number">1</span>;
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>NUM_SWIRLY_ITEMS; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">int</span> factor;
factor <span class="operator">=</span> swirlClockwise <span class="operator">?</span> (swirlyCounter <span class="operator">-</span> i <span class="operator">*</span> <span class="number">20</span>) : (swirlyCounter <span class="operator">+</span> i <span class="operator">*</span> <span class="number">20</span>);
<span class="keyword">if</span> (factor <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> factor <span class="operator"><</span><span class="operator">=</span> <span class="number">360</span>) {
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>x <span class="operator">=</span> viewportWidth <span class="operator">/</span> <span class="number">2.0</span> <span class="operator">+</span> <a href="qtcore-qmath-h.html#qSin">qSin</a>(factor <span class="operator">*</span> <span class="number">0.05</span>) <span class="operator">*</span> (viewportWidth <span class="operator">/</span> <span class="number">2.0</span>) <span class="operator">*</span> (<span class="number">100.0</span> <span class="operator">/</span> factor);
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>y <span class="operator">=</span> viewportHeight <span class="operator">/</span> <span class="number">2.0</span> <span class="operator">+</span> <a href="qtcore-qmath-h.html#qCos">qCos</a>(factor <span class="operator">*</span> <span class="number">0.05</span>) <span class="operator">*</span> (viewportHeight <span class="operator">/</span> <span class="number">2.0</span>) <span class="operator">*</span> (<span class="number">100.0</span> <span class="operator">/</span> factor);
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>rotation <span class="operator">+</span><span class="operator">=</span> <span class="operator">-</span>swirlyCounter <span class="operator">*</span> <span class="number">0.01</span>;
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator">+</span><span class="operator">=</span> swirlClockwise <span class="operator">?</span> <span class="operator">-</span>scaleFactor <span class="operator">*</span> <span class="number">1</span> <span class="operator">/</span> <span class="number">360.0</span> : scaleFactor <span class="operator">*</span> <span class="number">1</span> <span class="operator">/</span> <span class="number">360.0</span>;
<span class="keyword">if</span> (swirlClockwise) {
<span class="keyword">if</span> (swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator"><</span> <span class="number">0</span>)
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator">=</span> scaleFactor;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator">></span> scaleFactor)
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator">=</span> scaleFactor <span class="operator">*</span> <span class="number">1</span> <span class="operator">/</span> <span class="number">360.0</span>;
}
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleY <span class="operator">=</span> swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX;
} <span class="keyword">else</span> {
swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleX <span class="operator">=</span> swirlyItems<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>scaleY <span class="operator">=</span> <span class="number">0</span>;
}
}
<span class="keyword">if</span> (swirlClockwise) {
<span class="keyword">if</span> (swirlyCounter <span class="operator">></span> (<span class="number">360</span> <span class="operator">+</span> NUM_SWIRLY_ITEMS <span class="operator">*</span> <span class="number">20</span>))
swirlyCounter <span class="operator">=</span> <span class="number">0</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (swirlyCounter <span class="operator"><</span> <span class="operator">-</span>NUM_SWIRLY_ITEMS <span class="operator">*</span> <span class="number">20</span>)
swirlyCounter <span class="operator">=</span> <span class="number">360</span>;
}
}
<span class="keyword">class</span> GLWidget : <span class="keyword">public</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span>
{
<span class="keyword">public</span>:
GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>shareWidget <span class="operator">=</span> <span class="number">0</span>);
<span class="operator">~</span>GLWidget();
<span class="type">void</span> startRendering();
<span class="type">void</span> stopRendering();
<span class="keyword">protected</span>:
<span class="type">void</span> resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event);
<span class="type">void</span> paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event);
<span class="type"><a href="qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>); }
<span class="keyword">private</span>:
GLPainter glPainter;
<span class="type"><a href="qthread.html">QThread</a></span> glThread;
};
GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span> <span class="operator">*</span>share)
: <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers)<span class="operator">,</span> parent<span class="operator">,</span> share)
<span class="operator">,</span> glPainter(<span class="keyword">this</span>)
<span class="operator">,</span> glThread(<span class="keyword">this</span>)
{
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_PaintOutsidePaintEvent);
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
}
GLWidget<span class="operator">::</span><span class="operator">~</span>GLWidget()
{
stopRendering();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>startRendering()
{
glPainter<span class="operator">.</span>moveToThread(<span class="operator">&</span>glThread);
connect(<span class="operator">&</span>glThread<span class="operator">,</span> SIGNAL(started())<span class="operator">,</span> <span class="operator">&</span>glPainter<span class="operator">,</span> SLOT(start()));
glThread<span class="operator">.</span>start();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>stopRendering()
{
glPainter<span class="operator">.</span>stop();
glThread<span class="operator">.</span>wait();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event)
{
glPainter<span class="operator">.</span>resizeViewport(event<span class="operator">-</span><span class="operator">></span>size());
}
<span class="type">void</span> GLWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>)
{
<span class="comment">// Handled by GLPainter.</span>
}
<span class="keyword">class</span> MainWindow : <span class="keyword">public</span> <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>
{
Q_OBJECT
<span class="keyword">public</span>:
MainWindow();
<span class="keyword">private</span> <span class="keyword">slots</span>:
<span class="type">void</span> newThread();
<span class="type">void</span> killThread();
<span class="keyword">private</span>:
<span class="type"><a href="qmdiarea.html">QMdiArea</a></span> mdiArea;
<span class="type"><a href="qglwidget.html">QGLWidget</a></span> shareWidget;
};
MainWindow<span class="operator">::</span>MainWindow()
: <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(<span class="number">0</span>)
<span class="operator">,</span> mdiArea(<span class="keyword">this</span>)
<span class="operator">,</span> shareWidget(<span class="keyword">this</span>)
{
setWindowTitle(<span class="string">"Qt GL Hypnotizer"</span>);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>menu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(<span class="string">"&Hypnotizers"</span>);
menu<span class="operator">-</span><span class="operator">></span>addAction(<span class="string">"&New hypnotizer thread"</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(newThread())<span class="operator">,</span> <span class="type"><a href="qkeysequence.html">QKeySequence</a></span>(<span class="string">"Ctrl+N"</span>));
menu<span class="operator">-</span><span class="operator">></span>addAction(<span class="string">"&End current hypnotizer thread"</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(killThread())<span class="operator">,</span> <span class="type"><a href="qkeysequence.html">QKeySequence</a></span>(<span class="string">"Ctrl+K"</span>));
menu<span class="operator">-</span><span class="operator">></span>addSeparator();
menu<span class="operator">-</span><span class="operator">></span>addAction(<span class="string">"E&xit"</span><span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit())<span class="operator">,</span> <span class="type"><a href="qkeysequence.html">QKeySequence</a></span>(<span class="string">"Ctrl+Q"</span>));
setCentralWidget(<span class="operator">&</span>mdiArea);
shareWidget<span class="operator">.</span>resize(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
newThread();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>newThread()
{
<span class="keyword">static</span> <span class="type">int</span> windowCount <span class="operator">=</span> <span class="number">1</span>;
<span class="keyword">if</span> (mdiArea<span class="operator">.</span>subWindowList()<span class="operator">.</span>count() <span class="operator">></span> <span class="number">9</span>)
<span class="keyword">return</span>;
GLWidget <span class="operator">*</span>widget <span class="operator">=</span> <span class="keyword">new</span> GLWidget(<span class="operator">&</span>mdiArea<span class="operator">,</span> <span class="operator">&</span>shareWidget);
mdiArea<span class="operator">.</span>addSubWindow(widget);
widget<span class="operator">-</span><span class="operator">></span>setWindowTitle(<span class="string">"Thread #"</span> <span class="operator">+</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(windowCount<span class="operator">+</span><span class="operator">+</span>));
widget<span class="operator">-</span><span class="operator">></span>show();
widget<span class="operator">-</span><span class="operator">></span>startRendering();
}
<span class="type">void</span> MainWindow<span class="operator">::</span>killThread()
{
<span class="keyword">delete</span> mdiArea<span class="operator">.</span>activeSubWindow();
}
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="comment">// Make Xlib and GLX thread safe under X11</span>
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AA_X11InitThreads);
<span class="type"><a href="qapplication.html">QApplication</a></span> application(argc<span class="operator">,</span> argv);
<span class="comment">// Using QPainter to draw into QGLWidgets is only supported with GL 2.0</span>
<span class="keyword">if</span> (<span class="operator">!</span>((<span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>openGLVersionFlags() <span class="operator">&</span> <span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>OpenGL_Version_2_0) <span class="operator">|</span><span class="operator">|</span>
(<span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>openGLVersionFlags() <span class="operator">&</span> <span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>OpenGL_ES_Version_2_0))) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="number">0</span><span class="operator">,</span> <span class="string">"Qt GL Hypnotizer"</span><span class="operator">,</span>
<span class="string">"This system does not support OpenGL 2.0 or OpenGL ES 2.0, "</span>
<span class="string">"which is required for this example to work."</span>);
<span class="keyword">return</span> <span class="number">0</span>;
}
MainWindow mainWindow;
mainWindow<span class="operator">.</span>show();
<span class="keyword">return</span> application<span class="operator">.</span>exec();
}
<span class="preprocessor">#include "main.moc"</span></pre>
</div>
<!-- @@@demos/glhypnotizer/main.cpp -->
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