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<title>libQGLViewer mouseGrabber example</title>
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<h1>The mouseGrabber example</h1>
<center>
<img src="../images/mouseGrabber.jpg" width="330" height="228" alt="mouseGrabber"/>
</center>
<p>
<code>MouseGrabber</code>s enable complex mouse interaction.
</p>
<p>
A <code>MouseGrabber</code> is an abstract class which defines objects that are sensitive to the
mouse. When activated, they grab the mouse events. Possible applications are interactive 2D or 3D
GUI, object auto-selection, auto drop-down menu and much more.
</p>
<p>
<code>ManipulatedFrame</code> are indeed <code>MouseGrabbers</code> as is illustrated here. Simply
hover on a spiral to automatically "select" it. Mouse events will then be grabbed by the
associated <code>ManipulatedFrame</code>, which can be moved without any key press or GUI
interaction. Useful to easily manipulate scene objects. Note that by default, a
<code>ManipulatedFrame</code> grabs the mouse when the cursor is close enough to its
<code>position()</code>. You may want to overload the <code>checkIfGrabsMouse()</code> function to
define a more complex grabbing test.
</p>
<p>
That's what is done in the <code>CameraPathPlayer</code> class, which is associated to a Camera
keyFrame paths or position. It is displayed as a text on the left hand side of the window (when
its associated path is defined). It reacts to mouse hovering and clicking the text will play
(resp. restore) the Camera path (resp. position).
</p>
<h2>mouseGrabber.h</h2>
<!-- Generator: GNU source-highlight 2.4
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000080">#include</font></b> <font color="#FF0000"><QGLViewer/qglviewer.h></font>
<b><font color="#0000FF">class</font></b> CameraPathPlayer <font color="#990000">:</font> <b><font color="#0000FF">public</font></b> qglviewer<font color="#990000">::</font>MouseGrabber
<font color="#FF0000">{</font>
<b><font color="#0000FF">public</font></b><font color="#990000">:</font>
<b><font color="#000000">CameraPathPlayer</font></b><font color="#990000">(</font><font color="#009900">int</font> nb<font color="#990000">)</font> <font color="#990000">:</font> <b><font color="#000000">pathNb</font></b><font color="#990000">(</font>nb<font color="#990000">)</font> <font color="#FF0000">{}</font><font color="#990000">;</font>
<font color="#009900">void</font> <b><font color="#000000">checkIfGrabsMouse</font></b><font color="#990000">(</font><font color="#009900">int</font> x<font color="#990000">,</font> <font color="#009900">int</font> y<font color="#990000">,</font> <b><font color="#0000FF">const</font></b> qglviewer<font color="#990000">::</font>Camera<font color="#990000">*</font> <b><font color="#0000FF">const</font></b> camera<font color="#990000">);</font>
<font color="#009900">int</font> <b><font color="#000000">yPos</font></b><font color="#990000">()</font> <font color="#FF0000">{</font> <b><font color="#0000FF">return</font></b> <font color="#993399">25</font><font color="#990000">*</font>pathNb<font color="#990000">;</font> <font color="#FF0000">}</font><font color="#990000">;</font>
<b><font color="#0000FF">protected</font></b><font color="#990000">:</font>
<font color="#009900">void</font> <b><font color="#000000">mousePressEvent</font></b><font color="#990000">(</font>QMouseEvent<font color="#990000">*</font> <b><font color="#0000FF">const</font></b><font color="#990000">,</font> qglviewer<font color="#990000">::</font>Camera<font color="#990000">*</font> <b><font color="#0000FF">const</font></b> camera<font color="#990000">)</font> <font color="#FF0000">{</font> camera<font color="#990000">-></font><b><font color="#000000">playPath</font></b><font color="#990000">(</font>pathNb<font color="#990000">);</font> <font color="#FF0000">}</font><font color="#990000">;</font>
<b><font color="#0000FF">private</font></b><font color="#990000">:</font>
<font color="#009900">int</font> pathNb<font color="#990000">;</font>
<font color="#FF0000">}</font><font color="#990000">;</font>
<b><font color="#0000FF">class</font></b> Spiral
<font color="#FF0000">{</font>
<b><font color="#0000FF">public</font></b><font color="#990000">:</font>
<font color="#009900">void</font> <b><font color="#000000">draw</font></b><font color="#990000">()</font> <b><font color="#0000FF">const</font></b><font color="#990000">;</font>
<font color="#009900">void</font> <b><font color="#000000">setPosition</font></b><font color="#990000">(</font><b><font color="#0000FF">const</font></b> qglviewer<font color="#990000">::</font>Vec<font color="#990000">&</font> pos<font color="#990000">)</font> <font color="#FF0000">{</font> mf_<font color="#990000">.</font><b><font color="#000000">setPosition</font></b><font color="#990000">(</font>pos<font color="#990000">);</font> <font color="#FF0000">}</font><font color="#990000">;</font>
<b><font color="#0000FF">private</font></b><font color="#990000">:</font>
qglviewer<font color="#990000">::</font>ManipulatedFrame mf_<font color="#990000">;</font>
<font color="#FF0000">}</font><font color="#990000">;</font>
<b><font color="#0000FF">class</font></b> Viewer <font color="#990000">:</font> <b><font color="#0000FF">public</font></b> QGLViewer
<font color="#FF0000">{</font>
<b><font color="#0000FF">protected</font></b> <font color="#990000">:</font>
<b><font color="#0000FF">virtual</font></b> <font color="#009900">void</font> <b><font color="#000000">init</font></b><font color="#990000">();</font>
<b><font color="#0000FF">virtual</font></b> <font color="#009900">void</font> <b><font color="#000000">draw</font></b><font color="#990000">();</font>
<b><font color="#0000FF">virtual</font></b> QString <b><font color="#000000">helpString</font></b><font color="#990000">()</font> <b><font color="#0000FF">const</font></b><font color="#990000">;</font>
<font color="#009900">void</font> <b><font color="#000000">displayPlayers</font></b><font color="#990000">();</font>
<font color="#009900">void</font> <b><font color="#000000">updatePlayers</font></b><font color="#990000">();</font>
<b><font color="#0000FF">private</font></b><font color="#990000">:</font>
CameraPathPlayer<font color="#990000">**</font> player_<font color="#990000">;</font>
<font color="#009900">int</font> nbPlayers_<font color="#990000">;</font>
<b><font color="#000080">#if</font></b> QT_VERSION <font color="#990000"><</font> <font color="#993399">0x040000</font>
QValueVector<font color="#990000"><</font>Spiral<font color="#990000">></font> spiral_<font color="#990000">;</font>
<b><font color="#000080">#else</font></b>
QList<font color="#990000"><</font>Spiral<font color="#990000">></font> spiral_<font color="#990000">;</font>
<b><font color="#000080">#endif</font></b>
<font color="#FF0000">}</font><font color="#990000">;</font>
</tt></pre>
<h2>mouseGrabber.cpp</h2>
<!-- Generator: GNU source-highlight 2.4
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000080">#include</font></b> <font color="#FF0000">"mouseGrabber.h"</font>
<b><font color="#0000FF">using</font></b> <b><font color="#0000FF">namespace</font></b> qglviewer<font color="#990000">;</font>
<b><font color="#0000FF">using</font></b> <b><font color="#0000FF">namespace</font></b> std<font color="#990000">;</font>
<font color="#009900">void</font> CameraPathPlayer<font color="#990000">::</font><b><font color="#000000">checkIfGrabsMouse</font></b><font color="#990000">(</font><font color="#009900">int</font> x<font color="#990000">,</font> <font color="#009900">int</font> y<font color="#990000">,</font> <b><font color="#0000FF">const</font></b> Camera<font color="#990000">*</font> <b><font color="#0000FF">const</font></b><font color="#990000">)</font>
<font color="#FF0000">{</font>
<i><font color="#9A1900">// Rectangular activation array - May have to be tune depending on your default font size</font></i>
<b><font color="#000000">setGrabsMouse</font></b><font color="#990000">((</font>x <font color="#990000"><</font> <font color="#993399">80</font><font color="#990000">)</font> <font color="#990000">&&</font> <font color="#990000">(</font>y<font color="#990000"><</font><b><font color="#000000">yPos</font></b><font color="#990000">())</font> <font color="#990000">&&</font> <font color="#990000">((</font><b><font color="#000000">yPos</font></b><font color="#990000">()-</font>y<font color="#990000">)</font> <font color="#990000"><</font> <font color="#993399">16</font><font color="#990000">));</font>
<font color="#FF0000">}</font>
<font color="#009900">void</font> Viewer<font color="#990000">::</font><b><font color="#000000">displayPlayers</font></b><font color="#990000">()</font>
<font color="#FF0000">{</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font><font color="#009900">int</font> i<font color="#990000">=</font><font color="#993399">0</font><font color="#990000">;</font> i<font color="#990000"><</font>nbPlayers_<font color="#990000">;</font> <font color="#990000">++</font>i<font color="#990000">)</font>
<font color="#FF0000">{</font>
CameraPathPlayer<font color="#990000">*</font> cpp <font color="#990000">=</font> player_<font color="#990000">[</font>i<font color="#990000">];</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font>cpp<font color="#990000">)</font>
<font color="#FF0000">{</font>
QString s<font color="#990000">;</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font>cpp<font color="#990000">-></font><b><font color="#000000">grabsMouse</font></b><font color="#990000">())</font>
<font color="#FF0000">{</font>
<b><font color="#000000">glColor3f</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">,</font><font color="#993399">1</font><font color="#990000">,</font><font color="#993399">1</font><font color="#990000">);</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font><b><font color="#000000">camera</font></b><font color="#990000">()-></font><b><font color="#000000">keyFrameInterpolator</font></b><font color="#990000">(</font>i<font color="#990000">)-></font><b><font color="#000000">numberOfKeyFrames</font></b><font color="#990000">()</font> <font color="#990000">></font> <font color="#993399">1</font><font color="#990000">)</font>
s <font color="#990000">=</font> <font color="#FF0000">"Play path F"</font> <font color="#990000">+</font> QString<font color="#990000">::</font><b><font color="#000000">number</font></b><font color="#990000">(</font>i<font color="#990000">);</font>
<b><font color="#0000FF">else</font></b>
s <font color="#990000">=</font> <font color="#FF0000">"Restore pos F"</font> <font color="#990000">+</font> QString<font color="#990000">::</font><b><font color="#000000">number</font></b><font color="#990000">(</font>i<font color="#990000">);</font>
<font color="#FF0000">}</font>
<b><font color="#0000FF">else</font></b>
<font color="#FF0000">{</font>
<b><font color="#000000">glColor3f</font></b><font color="#990000">(</font><font color="#993399">0</font><font color="#990000">.</font>6f<font color="#990000">,</font> <font color="#993399">0</font><font color="#990000">.</font>6f<font color="#990000">,</font> <font color="#993399">0</font><font color="#990000">.</font>6f<font color="#990000">);</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font><b><font color="#000000">camera</font></b><font color="#990000">()-></font><b><font color="#000000">keyFrameInterpolator</font></b><font color="#990000">(</font>i<font color="#990000">)-></font><b><font color="#000000">numberOfKeyFrames</font></b><font color="#990000">()</font> <font color="#990000">></font> <font color="#993399">1</font><font color="#990000">)</font>
s <font color="#990000">=</font> <font color="#FF0000">"Path F"</font> <font color="#990000">+</font> QString<font color="#990000">::</font><b><font color="#000000">number</font></b><font color="#990000">(</font>i<font color="#990000">);</font>
<b><font color="#0000FF">else</font></b>
s <font color="#990000">=</font> <font color="#FF0000">"Pos F"</font> <font color="#990000">+</font> QString<font color="#990000">::</font><b><font color="#000000">number</font></b><font color="#990000">(</font>i<font color="#990000">);</font>
<font color="#FF0000">}</font>
<b><font color="#000000">drawText</font></b><font color="#990000">(</font><font color="#993399">10</font><font color="#990000">,</font> cpp<font color="#990000">-></font><b><font color="#000000">yPos</font></b><font color="#990000">()-</font><font color="#993399">3</font><font color="#990000">,</font> s<font color="#990000">);</font>
<font color="#FF0000">}</font>
<font color="#FF0000">}</font>
<font color="#FF0000">}</font>
<font color="#009900">void</font> Viewer<font color="#990000">::</font><b><font color="#000000">updatePlayers</font></b><font color="#990000">()</font>
<font color="#FF0000">{</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font><font color="#009900">int</font> i<font color="#990000">=</font><font color="#993399">0</font><font color="#990000">;</font> i<font color="#990000"><</font>nbPlayers_<font color="#990000">;</font> <font color="#990000">++</font>i<font color="#990000">)</font>
<font color="#FF0000">{</font>
<i><font color="#9A1900">// Check if CameraPathPlayer is still valid</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">((</font>player_<font color="#990000">[</font>i<font color="#990000">])</font> <font color="#990000">&&</font> <font color="#990000">(!</font><b><font color="#000000">camera</font></b><font color="#990000">()-></font><b><font color="#000000">keyFrameInterpolator</font></b><font color="#990000">(</font>i<font color="#990000">)))</font>
<font color="#FF0000">{</font>
<b><font color="#0000FF">delete</font></b> player_<font color="#990000">[</font>i<font color="#990000">];</font>
player_<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000">=</font> NULL<font color="#990000">;</font>
<font color="#FF0000">}</font>
<i><font color="#9A1900">// Or add it if needed</font></i>
<b><font color="#0000FF">if</font></b> <font color="#990000">((</font><b><font color="#000000">camera</font></b><font color="#990000">()-></font><b><font color="#000000">keyFrameInterpolator</font></b><font color="#990000">(</font>i<font color="#990000">))</font> <font color="#990000">&&</font> <font color="#990000">(!</font>player_<font color="#990000">[</font>i<font color="#990000">]))</font>
player_<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000">=</font> <b><font color="#0000FF">new</font></b> <b><font color="#000000">CameraPathPlayer</font></b><font color="#990000">(</font>i<font color="#990000">);</font>
<font color="#FF0000">}</font>
<font color="#FF0000">}</font>
<font color="#009900">void</font> Viewer<font color="#990000">::</font><b><font color="#000000">init</font></b><font color="#990000">()</font>
<font color="#FF0000">{</font>
<i><font color="#9A1900">// Absolutely needed for MouseGrabber</font></i>
<b><font color="#000000">setMouseTracking</font></b><font color="#990000">(</font><b><font color="#0000FF">true</font></b><font color="#990000">);</font>
<i><font color="#9A1900">// In order to make the manipulatedFrame displacements clearer</font></i>
<b><font color="#000000">setAxisIsDrawn</font></b><font color="#990000">();</font>
<i><font color="#9A1900">// Initialize the CameraPathPlayer MouseGrabber array</font></i>
nbPlayers_ <font color="#990000">=</font> <font color="#993399">12</font><font color="#990000">;</font>
player_ <font color="#990000">=</font> <b><font color="#0000FF">new</font></b> CameraPathPlayer<font color="#990000">*[</font>nbPlayers_<font color="#990000">];</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font><font color="#009900">int</font> i<font color="#990000">=</font><font color="#993399">0</font><font color="#990000">;</font> i<font color="#990000"><</font>nbPlayers_<font color="#990000">;</font> <font color="#990000">++</font>i<font color="#990000">)</font>
player_<font color="#990000">[</font>i<font color="#990000">]</font> <font color="#990000">=</font> NULL<font color="#990000">;</font>
<i><font color="#9A1900">// Create a scene with several spirals.</font></i>
<b><font color="#0000FF">const</font></b> <font color="#009900">int</font> nbSpirals <font color="#990000">=</font> <font color="#993399">7</font><font color="#990000">;</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font><font color="#009900">int</font> i <font color="#990000">=</font> <font color="#990000">-</font>nbSpirals<font color="#990000">/</font><font color="#993399">2</font><font color="#990000">;</font> i<font color="#990000"><=</font>nbSpirals<font color="#990000">/</font><font color="#993399">2</font><font color="#990000">;</font> <font color="#990000">++</font>i<font color="#990000">)</font>
<font color="#FF0000">{</font>
Spiral s<font color="#990000">;</font>
s<font color="#990000">.</font><b><font color="#000000">setPosition</font></b><font color="#990000">(</font><b><font color="#000000">Vec</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">.</font>8f<font color="#990000">*</font>i<font color="#990000">/</font>nbSpirals<font color="#990000">,</font> <font color="#993399">0.0</font><font color="#990000">,</font> <font color="#993399">0.0</font><font color="#990000">));</font>
spiral_<font color="#990000">.</font><b><font color="#000000">push_back</font></b><font color="#990000">(</font>s<font color="#990000">);</font>
<font color="#FF0000">}</font>
<b><font color="#000000">restoreStateFromFile</font></b><font color="#990000">();</font>
<b><font color="#000000">help</font></b><font color="#990000">();</font>
<font color="#FF0000">}</font>
<font color="#009900">void</font> Viewer<font color="#990000">::</font><b><font color="#000000">draw</font></b><font color="#990000">()</font>
<font color="#FF0000">{</font>
<b><font color="#000080">#if</font></b> QT_VERSION <font color="#990000"><</font> <font color="#993399">0x040000</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font>QValueVector<font color="#990000"><</font>Spiral<font color="#990000">>::</font>const_iterator it<font color="#990000">=</font>spiral_<font color="#990000">.</font><b><font color="#000000">begin</font></b><font color="#990000">(),</font> end<font color="#990000">=</font>spiral_<font color="#990000">.</font><b><font color="#000000">end</font></b><font color="#990000">();</font> it <font color="#990000">!=</font> end<font color="#990000">;</font> <font color="#990000">++</font>it<font color="#990000">)</font>
<b><font color="#000080">#else</font></b>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font>QList<font color="#990000"><</font>Spiral<font color="#990000">>::</font>const_iterator it<font color="#990000">=</font>spiral_<font color="#990000">.</font><b><font color="#000000">begin</font></b><font color="#990000">(),</font> end<font color="#990000">=</font>spiral_<font color="#990000">.</font><b><font color="#000000">end</font></b><font color="#990000">();</font> it <font color="#990000">!=</font> end<font color="#990000">;</font> <font color="#990000">++</font>it<font color="#990000">)</font>
<b><font color="#000080">#endif</font></b>
<font color="#990000">(*</font>it<font color="#990000">).</font><b><font color="#000000">draw</font></b><font color="#990000">();</font>
<b><font color="#000000">updatePlayers</font></b><font color="#990000">();</font>
<b><font color="#000000">glDisable</font></b><font color="#990000">(</font>GL_LIGHTING<font color="#990000">);</font>
<b><font color="#000000">displayPlayers</font></b><font color="#990000">();</font>
<b><font color="#000000">glEnable</font></b><font color="#990000">(</font>GL_LIGHTING<font color="#990000">);</font>
<font color="#FF0000">}</font>
QString Viewer<font color="#990000">::</font><b><font color="#000000">helpString</font></b><font color="#990000">()</font> <b><font color="#0000FF">const</font></b>
<font color="#FF0000">{</font>
QString <b><font color="#000000">text</font></b><font color="#990000">(</font><font color="#FF0000">"<h2>M o u s e G r a b b e r </h2>"</font><font color="#990000">);</font>
text <font color="#990000">+=</font> <font color="#FF0000">"This example illustrates the use of <i>MouseGrabber</i>, which is an abstract "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"class for objects that react (usually when the mouse hovers over them).<br><br>"</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"Define new camera paths (or positions) using <b>Alt</b>+[<b>F1</b>-<b>F12</b>]. "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"New <i>MouseGrabbers</i> are then created and displayed in the upper left corner. "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"Note how they react when the mouse hovers, and click them to play the associated path.<br><br>"</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"<i>ManipulatedFrame</i>, such as the ones which define the spirals' positions, are "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"also <i>MouseGrabbers</i>. When the mouse is close to the spiral center, the <i>ManipulatedFrame</i> "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"will grab to mouse click (as if the <b>Control</b> key was pressed). This is very convenient "</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"to intuitively move scene objects (such as lights) without any key or GUI interaction.<br><br>"</font><font color="#990000">;</font>
text <font color="#990000">+=</font> <font color="#FF0000">"Note that <code>setMouseTracking()</code> must be enabled to use <i>MouseGrabbers</i>."</font><font color="#990000">;</font>
<b><font color="#0000FF">return</font></b> text<font color="#990000">;</font>
<font color="#FF0000">}</font>
<font color="#009900">void</font> Spiral<font color="#990000">::</font><b><font color="#000000">draw</font></b><font color="#990000">()</font> <b><font color="#0000FF">const</font></b>
<font color="#FF0000">{</font>
<b><font color="#000000">glPushMatrix</font></b><font color="#990000">();</font>
<b><font color="#000000">glMultMatrixd</font></b><font color="#990000">(</font>mf_<font color="#990000">.</font><b><font color="#000000">matrix</font></b><font color="#990000">());</font>
<i><font color="#9A1900">// Draw a spiral</font></i>
<b><font color="#0000FF">const</font></b> <font color="#009900">float</font> nbSteps <font color="#990000">=</font> <font color="#993399">100.0</font><font color="#990000">;</font>
<b><font color="#000000">glBegin</font></b><font color="#990000">(</font>GL_QUAD_STRIP<font color="#990000">);</font>
<b><font color="#0000FF">for</font></b> <font color="#990000">(</font><font color="#009900">float</font> i<font color="#990000">=</font><font color="#993399">0</font><font color="#990000">;</font> i<font color="#990000"><</font>nbSteps<font color="#990000">;</font> <font color="#990000">++</font>i<font color="#990000">)</font>
<font color="#FF0000">{</font>
<font color="#009900">float</font> ratio <font color="#990000">=</font> i<font color="#990000">/</font>nbSteps<font color="#990000">;</font>
<font color="#009900">float</font> angle <font color="#990000">=</font> <font color="#993399">21.0</font><font color="#990000">*</font>ratio<font color="#990000">;</font>
<font color="#009900">float</font> c <font color="#990000">=</font> <b><font color="#000000">cos</font></b><font color="#990000">(</font>angle<font color="#990000">);</font>
<font color="#009900">float</font> s <font color="#990000">=</font> <b><font color="#000000">sin</font></b><font color="#990000">(</font>angle<font color="#990000">);</font>
<font color="#009900">float</font> r1 <font color="#990000">=</font> <font color="#993399">0.2</font> <font color="#990000">-</font> <font color="#993399">0.15</font><font color="#990000">*</font>ratio<font color="#990000">;</font>
<font color="#009900">float</font> r2 <font color="#990000">=</font> <font color="#993399">0.16</font> <font color="#990000">-</font> <font color="#993399">0.15</font><font color="#990000">*</font>ratio<font color="#990000">;</font>
<font color="#009900">float</font> alt <font color="#990000">=</font> <font color="#993399">0</font><font color="#990000">.</font>2f <font color="#990000">*</font> <font color="#990000">(</font>ratio <font color="#990000">-</font> <font color="#993399">0.5</font><font color="#990000">);</font>
<b><font color="#0000FF">const</font></b> <font color="#009900">float</font> nor <font color="#990000">=</font> <font color="#990000">.</font><font color="#993399">5</font><font color="#990000">;</font>
<b><font color="#0000FF">const</font></b> <font color="#009900">float</font> up <font color="#990000">=</font> <b><font color="#000000">sqrt</font></b><font color="#990000">(</font><font color="#993399">1.0</font><font color="#990000">-</font>nor<font color="#990000">*</font>nor<font color="#990000">);</font>
<b><font color="#0000FF">if</font></b> <font color="#990000">(</font>mf_<font color="#990000">.</font><b><font color="#000000">grabsMouse</font></b><font color="#990000">())</font>
<b><font color="#000000">glColor3f</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">-</font>ratio<font color="#990000">,</font> <font color="#993399">0</font><font color="#990000">.</font>8f <font color="#990000">,</font> ratio<font color="#990000">/</font><font color="#993399">2.0</font><font color="#990000">);</font>
<b><font color="#0000FF">else</font></b>
<b><font color="#000000">glColor3f</font></b><font color="#990000">(</font><font color="#993399">1</font><font color="#990000">-</font>ratio<font color="#990000">,</font> <font color="#993399">0</font><font color="#990000">.</font>2f <font color="#990000">,</font> ratio<font color="#990000">);</font>
<b><font color="#000000">glNormal3f</font></b><font color="#990000">(</font>nor<font color="#990000">*</font>c<font color="#990000">,</font> up<font color="#990000">,</font> nor<font color="#990000">*</font>s<font color="#990000">);</font>
<b><font color="#000000">glVertex3f</font></b><font color="#990000">(</font>r1<font color="#990000">*</font>c<font color="#990000">,</font> alt<font color="#990000">,</font> r1<font color="#990000">*</font>s<font color="#990000">);</font>
<b><font color="#000000">glVertex3f</font></b><font color="#990000">(</font>r2<font color="#990000">*</font>c<font color="#990000">,</font> alt<font color="#990000">+</font><font color="#993399">0.01</font><font color="#990000">,</font> r2<font color="#990000">*</font>s<font color="#990000">);</font>
<font color="#FF0000">}</font>
<b><font color="#000000">glEnd</font></b><font color="#990000">();</font>
<b><font color="#000000">glPopMatrix</font></b><font color="#990000">();</font>
<font color="#FF0000">}</font>
</tt></pre>
<h2>main.cpp</h2>
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<pre><tt><b><font color="#000080">#include</font></b> <font color="#FF0000">"mouseGrabber.h"</font>
<b><font color="#000080">#include</font></b> <font color="#FF0000"><qapplication.h></font>
<font color="#009900">int</font> <b><font color="#000000">main</font></b><font color="#990000">(</font><font color="#009900">int</font> argc<font color="#990000">,</font> <font color="#009900">char</font><font color="#990000">**</font> argv<font color="#990000">)</font>
<font color="#FF0000">{</font>
QApplication <b><font color="#000000">application</font></b><font color="#990000">(</font>argc<font color="#990000">,</font>argv<font color="#990000">);</font>
Viewer viewer<font color="#990000">;</font>
<b><font color="#000080">#if</font></b> QT_VERSION <font color="#990000"><</font> <font color="#993399">0x040000</font>
application<font color="#990000">.</font><b><font color="#000000">setMainWidget</font></b><font color="#990000">(&</font>viewer<font color="#990000">);</font>
<b><font color="#000080">#else</font></b>
viewer<font color="#990000">.</font><b><font color="#000000">setWindowTitle</font></b><font color="#990000">(</font><font color="#FF0000">"mouseGrabber"</font><font color="#990000">);</font>
<b><font color="#000080">#endif</font></b>
viewer<font color="#990000">.</font><b><font color="#000000">show</font></b><font color="#990000">();</font>
<b><font color="#0000FF">return</font></b> application<font color="#990000">.</font><b><font color="#000000">exec</font></b><font color="#990000">();</font>
<font color="#FF0000">}</font>
</tt></pre>
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