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<title>libQGLViewer stereoViewer example</title>
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<h1>The stereoViewer example</h1>
<center>
<img src="../images/stereoViewer.jpg" width="300" height="200" alt="stereoViewer"/>
</center>
<p>
Simply press S to toggle stereo display (architecture dependent).
</p>
<p>
This is a simple stereo application inspired from <a href="simpleViewer.html">simpleViewer</a>.
The constructor is called with a QFormat stereo option to enable stereo. Press 'S' to toggle
stereo display.
</p>
<h2>stereoViewer.h</h2>
<pre>
<span class="dir">#include <QGLViewer/qglviewer.h>
</span>
<span class="key">class </span>Viewer : <span class="key">public </span>QGLViewer
{
<span class="key">public </span>:
Viewer(<span class="typ">const </span>QGLFormat& format);
<span class="key">protected </span>:
<span class="key">virtual </span><span class="typ">void </span>draw();
<span class="key">virtual </span>QString helpString() <span class="typ">const</span>;
};</pre>
<h2>stereoViewer.cpp</h2>
<pre>
<span class="dir">#include </span><span class="dstr">"stereoViewer.h"</span><span class="dir">
</span><span class="dir">#include <qapplication.h>
</span><span class="dir">#include <math.h>
</span>
<span class="key">using namespace </span>std;
<span class="com">// Constructor must call the base class constructor.
</span><span class="com">// See the QT man page for details on QGLFormat.
</span>Viewer::Viewer(<span class="typ">const </span>QGLFormat& format)
: QGLViewer(format)
{
restoreFromFile();
<span class="com">// Activate the stereo display. Press 's' to toggle.
</span> setStereoDisplay(<span class="key">true</span>);
help();
}
QString Viewer::helpString() <span class="typ">const
</span>{
QString text(<span class="str">"<h2>S t e r e o V i e w e r</h2>"</span>);
text += <span class="str">"You can display in stereo with no change to your application.<br>"</span>;
text += <span class="str">"If you get a <b>Stereo not supported on this display</b> error message, check that "</span>;
text += <span class="str">"your machine supports stereo (search for quad-buffer in <i>glxinfo</i> and find stereo glasses!). "</span>;
text += <span class="str">"Send an e-mail if you were able to run other stereo applications and not this one.<br>"</span>;
text += <span class="str">"Press <b>S</b> to toggle the stereo display."</span>;
<span class="key">return </span>text;
}
<span class="typ">void </span>Viewer::draw()
{
<span class="com">// Draws a spiral
</span> <span class="typ">const float </span>nbSteps = <span class="num">500.0</span>;
glBegin(GL_QUAD_STRIP);
<span class="key">for </span>(<span class="typ">float </span>i=<span class="num">0</span>; i<nbSteps; ++i)
{
<span class="typ">float </span>ratio = i/nbSteps;
<span class="typ">float </span>angle = <span class="num">21.0</span>*ratio;
<span class="typ">float </span>c = cos(angle);
<span class="typ">float </span>s = sin(angle);
<span class="typ">float </span>r1 = <span class="num">1.0 </span>- <span class="num">0.8</span>*ratio;
<span class="typ">float </span>r2 = <span class="num">0.8 </span>- <span class="num">0.8</span>*ratio;
<span class="typ">float </span>alt = ratio <span class="num">- 0.5</span>;
<span class="typ">const float </span>nor = .<span class="num">5</span>;
<span class="typ">const float </span>up = sqrt(<span class="num">1.0</span>-nor*nor);
glColor3f(<span class="num">1</span>-ratio, .<span class="num">2 </span>, ratio);
glNormal3f(nor*c, up, nor*s);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+<span class="num">0.05</span>, r2*s);
}
glEnd();
<span class="key">return</span>;
}</pre>
<h2>main.cpp</h2>
<pre>
<span class="dir">#include </span><span class="dstr">"stereoViewer.h"</span><span class="dir">
</span><span class="dir">#include <qapplication.h>
</span>
<span class="typ">int </span>main(<span class="typ">int </span>argc, <span class="typ">char</span>** argv)
{
<span class="com">// Read command lines arguments.
</span> QApplication application(argc,argv);
<span class="com">// Instantiate the viewer with a stereo OpenGl context.
</span> QGLFormat format;
format.setStereo( TRUE );
Viewer viewer(format);
<span class="com">// Make the viewer window visible on screen.
</span> viewer.show();
<span class="com">// Set the viewer as the application main widget.
</span> application.setMainWidget(&viewer);
<span class="com">// Run main loop.
</span> <span class="key">return </span>application.exec();
}</pre>
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<i>Last modified on Thursday, February 5, 2004.</i>
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