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<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>
<pre>
#include <QGLViewer/qglviewer.h>
class Particle {
public:
Particle();
void init();
void draw();
void animate();
private:
qglviewer::Vec speed_, pos_;
int age_, ageMax_;
};
class Viewer : public QGLViewer {
protected:
virtual void draw();
virtual void init();
virtual void animate();
virtual QString helpString() const;
private:
int nbPart_;
Particle *particle_;
};
</pre>
<h2>animation.cpp</h2>
<pre>
#include "animation.h"
#include <math.h>
#include <stdlib.h> // RAND_MAX
using namespace qglviewer;
using namespace std;
/////////////////////// V i e w e r ///////////////////////
void Viewer::init() {
restoreStateFromFile();
glDisable(GL_LIGHTING);
nbPart_ = 2000;
particle_ = new Particle[nbPart_];
glPointSize(3.0);
setGridIsDrawn();
help();
startAnimation();
}
void Viewer::draw() {
glBegin(GL_POINTS);
for (int i = 0; i < nbPart_; i++)
particle_[i].draw();
glEnd();
}
void Viewer::animate() {
for (int i = 0; i < nbPart_; i++)
particle_[i].animate();
}
QString Viewer::helpString() const {
QString text("<h2>A n i m a t i o n</h2>");
text += "Use the <i>animate()</i> function to implement the animation part "
"of your ";
text += "application. Once the animation is started, <i>animate()</i> and "
"<i>draw()</i> ";
text += "are called in an infinite loop, at a frequency that can be "
"fixed.<br><br>";
text += "Press <b>Return</b> to start/stop the animation.";
return text;
}
/////////////////////// P a r t i c l e ///////////////////////////////
Particle::Particle() { init(); }
void Particle::animate() {
speed_.z -= 0.05f;
pos_ += 0.1f * speed_;
if (pos_.z < 0.0) {
speed_.z = -0.8 * speed_.z;
pos_.z = 0.0;
}
if (++age_ == ageMax_)
init();
}
void Particle::draw() {
glColor3f(age_ / (float)ageMax_, age_ / (float)ageMax_, 1.0);
glVertex3fv(pos_);
}
void Particle::init() {
pos_ = Vec(0.0, 0.0, 0.0);
float angle = 2.0 * M_PI * rand() / RAND_MAX;
float norm = 0.04 * rand() / RAND_MAX;
speed_ = Vec(norm * cos(angle), norm * sin(angle),
rand() / static_cast<float>(RAND_MAX));
age_ = 0;
ageMax_ = 50 + static_cast<int>(100.0 * rand() / RAND_MAX);
}
</pre>
<h2>main.cpp</h2>
<pre>
#include "animation.h"
#include <qapplication.h>
int main(int argc, char **argv) {
QApplication application(argc, argv);
Viewer viewer;
viewer.setWindowTitle("animation");
viewer.show();
return application.exec();
}
</pre>
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