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/****************************************************************************
Copyright (C) 2002-2007 Gilles Debunne (Gilles.Debunne@imag.fr)
This file is part of the QGLViewer library.
Version 2.2.6-3, released on August 28, 2007.
http://artis.imag.fr/Members/Gilles.Debunne/QGLViewer
libQGLViewer is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libQGLViewer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with libQGLViewer; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
#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 -= 0.05;
pos_ += 0.1 * 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);
}
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