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<h1 class="title">glwidget.cpp Example File</h1>
<span class="small-subtitle">opengl/samplebuffers/glwidget.cpp</span>
<!-- $$$opengl/samplebuffers/glwidget.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 examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
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** from this software without specific prior written permission.
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**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &quot;glwidget.h&quot;</span>
<span class="preprocessor">#include &lt;math.h&gt;</span>
<span class="preprocessor">#ifndef GL_MULTISAMPLE</span>
<span class="preprocessor">#define GL_MULTISAMPLE 0x809D</span>
<span class="preprocessor">#endif</span>
GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <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)
{
startTimer(<span class="number">40</span>);
setWindowTitle(tr(<span class="string">&quot;Sample Buffers&quot;</span>));
}
<span class="type">void</span> GLWidget<span class="operator">::</span>initializeGL()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(<span class="operator">-</span><span class="operator">.</span><span class="number">5</span><span class="operator">,</span> <span class="operator">.</span><span class="number">5</span><span class="operator">,</span> <span class="operator">.</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="operator">.</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1000</span><span class="operator">,</span> <span class="number">1000</span>);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(<span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
makeObject();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>resizeGL(<span class="type">int</span> w<span class="operator">,</span> <span class="type">int</span> h)
{
glViewport(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> w<span class="operator">,</span> h);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>paintGL()
{
<span class="keyword">static</span> <span class="type">float</span> rot <span class="operator">=</span> <span class="number">0.0</span>;
glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glEnable(GL_MULTISAMPLE);
glTranslatef(<span class="operator">-</span><span class="number">0.25f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">0.10f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glScalef(<span class="number">0.75f</span><span class="operator">,</span> <span class="number">1.15f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(rot<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glCallList(list);
glPopMatrix();
glPushMatrix();
glDisable(GL_MULTISAMPLE);
glTranslatef(<span class="number">0.25f</span><span class="operator">,</span> <span class="operator">-</span><span class="number">0.10f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glScalef(<span class="number">0.75f</span><span class="operator">,</span> <span class="number">1.15f</span><span class="operator">,</span> <span class="number">0.0f</span>);
glRotatef(rot<span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">0.0f</span><span class="operator">,</span> <span class="number">1.0f</span>);
glCallList(list);
glPopMatrix();
rot <span class="operator">+</span><span class="operator">=</span> <span class="number">0.2f</span>;
qglColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
renderText(<span class="operator">-</span><span class="number">0.35</span><span class="operator">,</span> <span class="number">0.4</span><span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="string">&quot;Multisampling enabled&quot;</span>);
renderText(<span class="number">0.15</span><span class="operator">,</span> <span class="number">0.4</span><span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="string">&quot;Multisampling disabled&quot;</span>);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>)
{
update();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>makeObject()
{
<span class="type"><a href="qcolor.html">QColor</a></span> qtGreen(<span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>fromCmykF(<span class="number">0.40</span><span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="number">1.0</span><span class="operator">,</span> <span class="number">0.0</span>));
<span class="keyword">const</span> <span class="type">double</span> Pi <span class="operator">=</span> <span class="number">3.14159265358979323846</span>;
<span class="keyword">const</span> <span class="type">int</span> NumSectors <span class="operator">=</span> <span class="number">15</span>;
GLdouble x1 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.06</span>;
GLdouble y1 <span class="operator">=</span> <span class="operator">-</span><span class="number">0.14</span>;
GLdouble x2 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.14</span>;
GLdouble y2 <span class="operator">=</span> <span class="operator">-</span><span class="number">0.06</span>;
GLdouble x3 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.08</span>;
GLdouble y3 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.00</span>;
GLdouble x4 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.30</span>;
GLdouble y4 <span class="operator">=</span> <span class="operator">+</span><span class="number">0.22</span>;
list <span class="operator">=</span> glGenLists(<span class="number">1</span>);
glNewList(list<span class="operator">,</span> GL_COMPILE);
{
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> NumSectors; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">double</span> angle1 <span class="operator">=</span> (i <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> Pi) <span class="operator">/</span> NumSectors;
GLdouble x5 <span class="operator">=</span> <span class="number">0.30</span> <span class="operator">*</span> sin(angle1);
GLdouble y5 <span class="operator">=</span> <span class="number">0.30</span> <span class="operator">*</span> cos(angle1);
GLdouble x6 <span class="operator">=</span> <span class="number">0.20</span> <span class="operator">*</span> sin(angle1);
GLdouble y6 <span class="operator">=</span> <span class="number">0.20</span> <span class="operator">*</span> cos(angle1);
<span class="type">double</span> angle2 <span class="operator">=</span> ((i <span class="operator">+</span> <span class="number">1</span>) <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> Pi) <span class="operator">/</span> NumSectors;
GLdouble x7 <span class="operator">=</span> <span class="number">0.20</span> <span class="operator">*</span> sin(angle2);
GLdouble y7 <span class="operator">=</span> <span class="number">0.20</span> <span class="operator">*</span> cos(angle2);
GLdouble x8 <span class="operator">=</span> <span class="number">0.30</span> <span class="operator">*</span> sin(angle2);
GLdouble y8 <span class="operator">=</span> <span class="number">0.30</span> <span class="operator">*</span> cos(angle2);
qglColor(qtGreen);
quad(GL_QUADS<span class="operator">,</span> x5<span class="operator">,</span> y5<span class="operator">,</span> x6<span class="operator">,</span> y6<span class="operator">,</span> x7<span class="operator">,</span> y7<span class="operator">,</span> x8<span class="operator">,</span> y8);
qglColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
quad(GL_LINE_LOOP<span class="operator">,</span> x5<span class="operator">,</span> y5<span class="operator">,</span> x6<span class="operator">,</span> y6<span class="operator">,</span> x7<span class="operator">,</span> y7<span class="operator">,</span> x8<span class="operator">,</span> y8);
}
qglColor(qtGreen);
quad(GL_QUADS<span class="operator">,</span> x1<span class="operator">,</span> y1<span class="operator">,</span> x2<span class="operator">,</span> y2<span class="operator">,</span> y2<span class="operator">,</span> x2<span class="operator">,</span> y1<span class="operator">,</span> x1);
quad(GL_QUADS<span class="operator">,</span> x3<span class="operator">,</span> y3<span class="operator">,</span> x4<span class="operator">,</span> y4<span class="operator">,</span> y4<span class="operator">,</span> x4<span class="operator">,</span> y3<span class="operator">,</span> x3);
qglColor(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
quad(GL_LINE_LOOP<span class="operator">,</span> x1<span class="operator">,</span> y1<span class="operator">,</span> x2<span class="operator">,</span> y2<span class="operator">,</span> y2<span class="operator">,</span> x2<span class="operator">,</span> y1<span class="operator">,</span> x1);
quad(GL_LINE_LOOP<span class="operator">,</span> x3<span class="operator">,</span> y3<span class="operator">,</span> x4<span class="operator">,</span> y4<span class="operator">,</span> y4<span class="operator">,</span> x4<span class="operator">,</span> y3<span class="operator">,</span> x3);
}
glEndList();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>quad(GLenum primitive<span class="operator">,</span> GLdouble x1<span class="operator">,</span> GLdouble y1<span class="operator">,</span> GLdouble x2<span class="operator">,</span> GLdouble y2<span class="operator">,</span>
GLdouble x3<span class="operator">,</span> GLdouble y3<span class="operator">,</span> GLdouble x4<span class="operator">,</span> GLdouble y4)
{
glBegin(primitive);
{
glVertex2d(x1<span class="operator">,</span> y1);
glVertex2d(x2<span class="operator">,</span> y2);
glVertex2d(x3<span class="operator">,</span> y3);
glVertex2d(x4<span class="operator">,</span> y4);
}
glEnd();
}</pre>
</div>
<!-- @@@opengl/samplebuffers/glwidget.cpp -->
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