<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>libQGLViewer animation example</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link href="../qglviewer.css" rel="stylesheet" type="text/css" /> <link rel="shortcut icon" href="../images/qglviewer.ico" type="image/x-icon" /> <link rel="icon" href="../images/qglviewer.icon.png" type="image/png" /> </head> <body> <div class="banner"> <a class="qindex" href="../index.html">Home</a> <a class="qindex" href="../refManual/hierarchy.html">Documentation</a> <a class="qindex" href="../download.html">Download</a> <a class="qindex highlight" href="index.html">Examples</a> <a class="qindex" href="../developer.html">Developer</a> </div> <h1>The animation example</h1> <center> <img src="../images/animation.jpg" width="330" height="228" alt="animation"/> </center> <p> The <code>animate()</code> function illustrated by a water particle simulation. </p> <p> When animation is activated (the Return key toggles animation), the <code>animate()</code> and then the <code>draw()</code> functions are called in an infinite loop. </p> <p> You can tune the frequency of your animation (default is 25Hz) using <code>setAnimationInterval()</code>. The frame rate will then be fixed, provided that your animation loop function is fast enough. </p> <h2>animation.h</h2> <!-- Generator: GNU source-highlight 3.0.1 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> <font color="#008080">Particle</font> <font color="#FF0000">{</font> <b><font color="#0000FF">public</font></b> <font color="#990000">:</font> <b><font color="#000000">Particle</font></b><font color="#990000">();</font> <font color="#009900">void</font> <b><font color="#000000">init</font></b><font color="#990000">();</font> <font color="#009900">void</font> <b><font color="#000000">draw</font></b><font color="#990000">();</font> <font color="#009900">void</font> <b><font color="#000000">animate</font></b><font color="#990000">();</font> <b><font color="#0000FF">private</font></b> <font color="#990000">:</font> qglviewer<font color="#990000">::</font><font color="#008080">Vec</font> speed_<font color="#990000">,</font> pos_<font color="#990000">;</font> <font color="#009900">int</font> age_<font color="#990000">,</font> ageMax_<font color="#990000">;</font> <font color="#FF0000">}</font><font color="#990000">;</font> <b><font color="#0000FF">class</font></b> <font color="#008080">Viewer</font> <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">draw</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">animate</font></b><font color="#990000">();</font> <b><font color="#0000FF">virtual</font></b> <font color="#008080">QString</font> <b><font color="#000000">helpString</font></b><font color="#990000">()</font> <b><font color="#0000FF">const</font></b><font color="#990000">;</font> <b><font color="#0000FF">private</font></b><font color="#990000">:</font> <font color="#009900">int</font> nbPart_<font color="#990000">;</font> Particle<font color="#990000">*</font> particle_<font color="#990000">;</font> <font color="#FF0000">}</font><font color="#990000">;</font> </tt></pre> <h2>animation.cpp</h2> <!-- Generator: GNU source-highlight 3.0.1 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">"animation.h"</font> <b><font color="#000080">#include</font></b> <font color="#FF0000"><math.h></font> <b><font color="#000080">#include</font></b> <font color="#FF0000"><stdlib.h></font> <i><font color="#9A1900">// RAND_MAX</font></i> <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> <i><font color="#9A1900">/////////////////////// V i e w e r ///////////////////////</font></i> <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> <b><font color="#000000">restoreStateFromFile</font></b><font color="#990000">();</font> <b><font color="#000000">glDisable</font></b><font color="#990000">(</font>GL_LIGHTING<font color="#990000">);</font> nbPart_ <font color="#990000">=</font> <font color="#993399">2000</font><font color="#990000">;</font> particle_ <font color="#990000">=</font> <b><font color="#0000FF">new</font></b> Particle<font color="#990000">[</font>nbPart_<font color="#990000">];</font> <b><font color="#000000">glPointSize</font></b><font color="#990000">(</font><font color="#993399">3.0</font><font color="#990000">);</font> <b><font color="#000000">setGridIsDrawn</font></b><font color="#990000">();</font> <b><font color="#000000">help</font></b><font color="#990000">();</font> <b><font color="#000000">startAnimation</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="#000000">glBegin</font></b><font color="#990000">(</font>GL_POINTS<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>nbPart_<font color="#990000">;</font> i<font color="#990000">++)</font> particle_<font color="#990000">[</font>i<font color="#990000">].</font><b><font color="#000000">draw</font></b><font color="#990000">();</font> <b><font color="#000000">glEnd</font></b><font color="#990000">();</font> <font color="#FF0000">}</font> <font color="#009900">void</font> Viewer<font color="#990000">::</font><b><font color="#000000">animate</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>nbPart_<font color="#990000">;</font> i<font color="#990000">++)</font> particle_<font color="#990000">[</font>i<font color="#990000">].</font><b><font color="#000000">animate</font></b><font color="#990000">();</font> <font color="#FF0000">}</font> <font color="#008080">QString</font> 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> <font color="#008080">QString</font> <b><font color="#000000">text</font></b><font color="#990000">(</font><font color="#FF0000">"<h2>A n i m a t i o n</h2>"</font><font color="#990000">);</font> text <font color="#990000">+=</font> <font color="#FF0000">"Use the <i>animate()</i> function to implement the animation part of your "</font><font color="#990000">;</font> text <font color="#990000">+=</font> <font color="#FF0000">"application. Once the animation is started, <i>animate()</i> and <i>draw()</i> "</font><font color="#990000">;</font> text <font color="#990000">+=</font> <font color="#FF0000">"are called in an infinite loop, at a frequency that can be fixed.<br><br>"</font><font color="#990000">;</font> text <font color="#990000">+=</font> <font color="#FF0000">"Press <b>Return</b> to start/stop the animation."</font><font color="#990000">;</font> <b><font color="#0000FF">return</font></b> text<font color="#990000">;</font> <font color="#FF0000">}</font> <i><font color="#9A1900">/////////////////////// P a r t i c l e ///////////////////////////////</font></i> Particle<font color="#990000">::</font><b><font color="#000000">Particle</font></b><font color="#990000">()</font> <font color="#FF0000">{</font> <b><font color="#000000">init</font></b><font color="#990000">();</font> <font color="#FF0000">}</font> <font color="#009900">void</font> Particle<font color="#990000">::</font><b><font color="#000000">animate</font></b><font color="#990000">()</font> <font color="#FF0000">{</font> speed_<font color="#990000">.</font>z <font color="#990000">-=</font> <font color="#993399">0</font><font color="#990000">.</font>05f<font color="#990000">;</font> pos_ <font color="#990000">+=</font> <font color="#993399">0</font><font color="#990000">.</font>1f <font color="#990000">*</font> speed_<font color="#990000">;</font> <b><font color="#0000FF">if</font></b> <font color="#990000">(</font>pos_<font color="#990000">.</font>z <font color="#990000"><</font> <font color="#993399">0.0</font><font color="#990000">)</font> <font color="#FF0000">{</font> speed_<font color="#990000">.</font>z <font color="#990000">=</font> <font color="#990000">-</font><font color="#993399">0.8</font><font color="#990000">*</font>speed_<font color="#990000">.</font>z<font color="#990000">;</font> pos_<font color="#990000">.</font>z <font color="#990000">=</font> <font color="#993399">0.0</font><font color="#990000">;</font> <font color="#FF0000">}</font> <b><font color="#0000FF">if</font></b> <font color="#990000">(++</font>age_ <font color="#990000">==</font> ageMax_<font color="#990000">)</font> <b><font color="#000000">init</font></b><font color="#990000">();</font> <font color="#FF0000">}</font> <font color="#009900">void</font> Particle<font color="#990000">::</font><b><font color="#000000">draw</font></b><font color="#990000">()</font> <font color="#FF0000">{</font> <b><font color="#000000">glColor3f</font></b><font color="#990000">(</font>age_<font color="#990000">/(</font><font color="#009900">float</font><font color="#990000">)</font>ageMax_<font color="#990000">,</font> age_<font color="#990000">/(</font><font color="#009900">float</font><font color="#990000">)</font>ageMax_<font color="#990000">,</font> <font color="#993399">1.0</font><font color="#990000">);</font> <b><font color="#000000">glVertex3fv</font></b><font color="#990000">(</font>pos_<font color="#990000">);</font> <font color="#FF0000">}</font> <font color="#009900">void</font> Particle<font color="#990000">::</font><b><font color="#000000">init</font></b><font color="#990000">()</font> <font color="#FF0000">{</font> pos_ <font color="#990000">=</font> <b><font color="#000000">Vec</font></b><font color="#990000">(</font><font color="#993399">0.0</font><font color="#990000">,</font> <font color="#993399">0.0</font><font color="#990000">,</font> <font color="#993399">0.0</font><font color="#990000">);</font> <font color="#009900">float</font> angle <font color="#990000">=</font> <font color="#993399">2.0</font> <font color="#990000">*</font> M_PI <font color="#990000">*</font> <b><font color="#000000">rand</font></b><font color="#990000">()</font> <font color="#990000">/</font> RAND_MAX<font color="#990000">;</font> <font color="#009900">float</font> norm <font color="#990000">=</font> <font color="#993399">0.04</font> <font color="#990000">*</font> <b><font color="#000000">rand</font></b><font color="#990000">()</font> <font color="#990000">/</font> RAND_MAX<font color="#990000">;</font> speed_ <font color="#990000">=</font> <b><font color="#000000">Vec</font></b><font color="#990000">(</font>norm<font color="#990000">*</font><b><font color="#000000">cos</font></b><font color="#990000">(</font>angle<font color="#990000">),</font> norm<font color="#990000">*</font><b><font color="#000000">sin</font></b><font color="#990000">(</font>angle<font color="#990000">),</font> <b><font color="#000000">rand</font></b><font color="#990000">()</font> <font color="#990000">/</font> <b><font color="#0000FF">static_cast</font></b><font color="#990000"><</font><font color="#009900">float</font><font color="#990000">>(</font>RAND_MAX<font color="#990000">)</font> <font color="#990000">);</font> age_ <font color="#990000">=</font> <font color="#993399">0</font><font color="#990000">;</font> ageMax_ <font color="#990000">=</font> <font color="#993399">50</font> <font color="#990000">+</font> <b><font color="#0000FF">static_cast</font></b><font color="#990000"><</font><font color="#009900">int</font><font color="#990000">>(</font><font color="#993399">100.0</font> <font color="#990000">*</font> <b><font color="#000000">rand</font></b><font color="#990000">()</font> <font color="#990000">/</font> RAND_MAX<font color="#990000">);</font> <font color="#FF0000">}</font> </tt></pre> <h2>main.cpp</h2> <!-- Generator: GNU source-highlight 3.0.1 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">"animation.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> <font color="#008080">QApplication</font> <b><font color="#000000">application</font></b><font color="#990000">(</font>argc<font color="#990000">,</font>argv<font color="#990000">);</font> <font color="#008080">Viewer</font> 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">"animation"</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> <p> Back to the <a href="index.html">examples main page</a>. </p> <p> <a href="http://validator.w3.org/check/referer"><img src="../images/xhtml.png" alt="Valid XHTML 1.0!" height="31" width="88"/></a> <a href="http://jigsaw.w3.org/css-validator/check/referer"><img src="../images/css.gif" width="88" height="31" alt="Valid CSS!"/></a> <i>Last modified on Saturday, May 22, 2010.</i> </p> </body> </html>