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//
// glgrav - OpenGL N-Body gravity simulator
//
// Copyright (C) 2003 Ian Cowburn (ianc@noddybox.demon.co.uk)
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// -------------------------------------------------------------------------
//
// Particles
//
//
static const char id[]="$Id$";
#include "particles.h"
Particles::Particles(GLfloat alpha_dec, GLfloat alpha_min)
{
m_alpha_dec=alpha_dec;
m_alpha_min=alpha_min;
}
Particles::~Particles()
{
}
void Particles::add(GLfloat x1, GLfloat y1, GLfloat z1,
GLfloat x2, GLfloat y2, GLfloat z2,
GLfloat r, GLfloat g, GLfloat b)
{
Point p;
p.x1=x1;
p.y1=y1;
p.z1=z1;
p.x2=x2;
p.y2=y2;
p.z2=z2;
p.r=r;
p.g=g;
p.b=b;
p.a=1.0;
m_list.push_back(p);
}
void Particles::draw()
{
list<Point>::iterator i;
glBegin(GL_LINES);
for(i=m_list.begin();i!=m_list.end();i++)
{
i->a-=m_alpha_dec;
glColor4f(i->r,i->g,i->b,i->a);
glVertex3f(i->x1,i->y1,i->z1);
glVertex3f(i->x2,i->y2,i->z2);
}
glEnd();
}
void Particles::update()
{
list<Point>::iterator i;
// Delete dead particles
//
i=m_list.begin();
while ((i!=m_list.end())&&(i->a<=m_alpha_min))
{
m_list.pop_front();
i=m_list.begin();
}
// Update them
//
for(i=m_list.begin();i!=m_list.end();i++)
{
i->a-=m_alpha_dec;
}
}
// END OF FILE //
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