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<title>libQGLViewer interface example</title>
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<h1>The interface example</h1>
<center>
<img src="../images/interface.jpg" width="300" height="200" alt="interface"/>
</center>
<p>
Adding a graphical user interface around a QGLViewer.
</p>
<p>
The same example as simpleViewer with an interface designed with <code>designer</code>. The
<code>interface</code>.ui file is the description of the interface resulting of designer. The
interface.cw file is the description of the signals and slots available. Here we use three slots
and three signals to connect to and from the interface and the viewer.
</p>
<p>
The designer cw files (custom widget), describing all the available signals and slots of the
<code>libQGLViewer</code> classes are available in the QGLViewer <code>include</code> directory.
</p>
<h2>interface.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(QWidget *parent,<span class="typ">const char </span>*name);
<span class="key">protected </span>:
<span class="key">virtual </span><span class="typ">void </span>draw();
<span class="key">virtual </span><span class="typ">void </span>init();
<span class="key">virtual </span>QString helpString() <span class="typ">const</span>;
};
</pre>
<h2>interface.cpp</h2>
<pre>
<span class="dir">#include </span><span class="dstr">"interface.h"</span><span class="dir">
</span><span class="dir">#include <math.h>
</span>
<span class="com">// Constructor must call the base class constructor.
</span>Viewer::Viewer(QWidget *parent,<span class="typ">const char </span>*name)
: QGLViewer(parent, name)
{
restoreFromFile();
help();
}
<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="typ">void </span>Viewer::init()
{
restoreFromFile();
}
QString Viewer::helpString() <span class="typ">const
</span>{
QString text(<span class="str">"<h2>I n t e r f a c e</h2>"</span>);
text += <span class="str">"A GUI can be added to a QGLViewer widget using Qt's <i>designer</i>. "</span>;
text += <span class="str">"All the available QGLViewer signals and slots are listed in a <b>qglviewer.cw</b> file, "</span>;
text += <span class="str">"located in the QGLViewer <i>include</i> directory."</span>;
<span class="key">return </span>text;
}</pre>
<h2>myInterface.h</h2>
<pre>
<span class="com">/****************************************************************************
** Form interface generated from reading ui file 'myInterface.ui'
**
** Created: Tue Sep 23 11:32:03 2003
** by: The User Interface Compiler (uic)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/</span>
<span class="dir">#ifndef FORM1_H
</span><span class="dir">#define FORM1_H
</span>
<span class="dir">#include <qvariant.h>
</span><span class="dir">#include <qwidget.h>
</span><span class="key">class </span>QVBoxLayout;
<span class="key">class </span>QHBoxLayout;
<span class="key">class </span>QGridLayout;
<span class="key">class </span>QCheckBox;
<span class="key">class </span>QPushButton;
<span class="key">class </span>Viewer;
<span class="key">class </span>myInterface : <span class="key">public </span>QWidget
{
Q_OBJECT
<span class="key">public</span>:
myInterface( QWidget* parent = <span class="num">0</span>, <span class="typ">const char</span>* name = <span class="num">0</span>, WFlags fl = <span class="num">0 </span>);
~myInterface();
Viewer* Viewer1;
QCheckBox* CheckBox1;
QCheckBox* CheckBox3;
QPushButton* PushButton1;
QCheckBox* CheckBox2;
<span class="key">protected</span>:
QGridLayout* Form1Layout;
};
<span class="dir">#endif </span><span class="com">// FORM1_H</span><span class="dir"></span></pre>
<h2>main.cpp</h2>
<pre>
<span class="dir">#include </span><span class="dstr">"interface.h"</span><span class="dir">
</span><span class="dir">#include </span><span class="dstr">"myInterface.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 interface.
</span> myInterface *main_window = <span class="key">new </span>myInterface(NULL);
<span class="com">// Make the viewer window visible on screen.
</span> main_window->setCaption(<span class="str">"Interface Example"</span>);
main_window->show();
<span class="com">// Set the viewer as the application main widget.
</span> application.setMainWidget(main_window);
<span class="com">// Run main loop.
</span> <span class="key">return </span>application.exec();
}</pre>
<h2>myInterface.cpp</h2>
<pre>
<span class="com">/****************************************************************************
** Form implementation generated from reading ui file 'myInterface.ui'
**
** Created: Tue Sep 23 12:38:27 2003
** by: The User Interface Compiler (uic)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/</span>
<span class="dir">#include </span><span class="dstr">"myInterface.h"</span><span class="dir">
</span>
<span class="dir">#include <qvariant.h>
</span><span class="dir">#include <qcheckbox.h>
</span><span class="dir">#include <qpushbutton.h>
</span><span class="dir">#include <qlayout.h>
</span><span class="dir">#include <qtooltip.h>
</span><span class="dir">#include <qwhatsthis.h>
</span><span class="dir">#include <qimage.h>
</span><span class="dir">#include <qpixmap.h>
</span>
<span class="dir">#include </span><span class="dstr">"interface.h"</span><span class="dir">
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<span class="com">/*
* Constructs a myInterface which is a child of 'parent', with the
* name 'name' and widget flags set to 'f'.
*/</span>
myInterface::myInterface( QWidget* parent, <span class="typ">const char</span>* name, WFlags fl )
: QWidget( parent, name, fl )
{
QPixmap image0( ( <span class="typ">const char</span>** ) image0_data );
<span class="key">if </span>( !name )
setName( <span class="str">"Form1"</span> );
resize( <span class="num">673</span>, <span class="num">438 </span>);
setCaption( trUtf8( <span class="str">"Form1"</span> ) );
Form1Layout = <span class="key">new </span>QGridLayout( <span class="key">this</span>, <span class="num">1</span>, <span class="num">1</span>, <span class="num">6</span>, <span class="num">2</span>, <span class="str">"Form1Layout"</span>);
Viewer1 = <span class="key">new </span>Viewer( <span class="key">this</span>, <span class="str">"Viewer1"</span> );
Form1Layout->addMultiCellWidget( Viewer1, <span class="num">0</span>, <span class="num">0</span>, <span class="num">0</span>, <span class="num">5 </span>);
CheckBox1 = <span class="key">new </span>QCheckBox( <span class="key">this</span>, <span class="str">"CheckBox1"</span> );
CheckBox1->setText( trUtf8( <span class="str">"FPS"</span> ) );
Form1Layout->addWidget( CheckBox1, <span class="num">1</span>, <span class="num">0 </span>);
CheckBox3 = <span class="key">new </span>QCheckBox( <span class="key">this</span>, <span class="str">"CheckBox3"</span> );
CheckBox3->setText( trUtf8( <span class="str">"Axis"</span> ) );
Form1Layout->addWidget( CheckBox3, <span class="num">1</span>, <span class="num">2 </span>);
PushButton1 = <span class="key">new </span>QPushButton( <span class="key">this</span>, <span class="str">"PushButton1"</span> );
PushButton1->setText( trUtf8( <span class="str">"Quit"</span> ) );
Form1Layout->addWidget( PushButton1, <span class="num">1</span>, <span class="num">5 </span>);
CheckBox2 = <span class="key">new </span>QCheckBox( <span class="key">this</span>, <span class="str">"CheckBox2"</span> );
CheckBox2->setText( trUtf8( <span class="str">"Grid"</span> ) );
Form1Layout->addWidget( CheckBox2, <span class="num">1</span>, <span class="num">1 </span>);
<span class="com">// signals and slots connections
</span> connect( CheckBox1, SIGNAL( toggled(<span class="typ">bool</span>) ), Viewer1, SLOT( setDisplayFPS(<span class="typ">bool</span>) ) );
connect( CheckBox2, SIGNAL( toggled(<span class="typ">bool</span>) ), Viewer1, SLOT( setDrawGrid(<span class="typ">bool</span>) ) );
connect( CheckBox3, SIGNAL( toggled(<span class="typ">bool</span>) ), Viewer1, SLOT( setDrawAxis(<span class="typ">bool</span>) ) );
connect( Viewer1, SIGNAL( axisDrawn(<span class="typ">bool</span>) ), CheckBox3, SLOT( setChecked(<span class="typ">bool</span>) ) );
connect( Viewer1, SIGNAL( gridDrawn(<span class="typ">bool</span>) ), CheckBox2, SLOT( setChecked(<span class="typ">bool</span>) ) );
connect( Viewer1, SIGNAL( fpsDisplayed(<span class="typ">bool</span>) ), CheckBox1, SLOT( setChecked(<span class="typ">bool</span>) ) );
connect( PushButton1, SIGNAL( released() ), <span class="key">this</span>, SLOT( close() ) );
}
<span class="com">/*
* Destroys the object and frees any allocated resources
*/</span>
myInterface::~myInterface()
{
<span class="com">// no need to delete child widgets, Qt does it all for us
</span>}
</pre>
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<i>Last modified on Thursday, February 5, 2004.</i>
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