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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
//
// -------------------------------------------------------------------------
//
// Sparks
//
//
static const char id[]="$Id$";
#include "sparks.h"
Sparks::Sparks(int num, GLfloat alpha_dec, GLfloat alpha_min,
int len, GLfloat delta)
{
m_num=max(num,1);
m_alpha_dec=alpha_dec;
m_alpha_min=alpha_min;
m_len=max(len,1);
m_delta=delta;
}
Sparks::~Sparks()
{
}
void Sparks::add(GLfloat ox, GLfloat oy, GLfloat oz)
{
int f;
Point p;
p.x2=ox;
p.y2=oy;
p.z2=oz;
p.life=m_life;
for(f=0;f<m_num;f++)
{
p.dx=DRand()*m_delta*2-m_delta;
p.dy=DRand()*m_delta*2-m_delta;
p.dz=DRand()*m_delta*2-m_delta;
p.x1=ox+p.dx*m_len;
p.y1=oy+p.dy*m_len;
p.z1=oz+p.dz*m_len;
p.alpha=1.0f;
m_list.push_back(p);
}
}
void Sparks::update()
{
list<Point>::iterator i;
// Delete dead sparks
//
i=m_list.begin();
while ((i!=m_list.end())&&(i->alpha<=m_alpha_min))
{
m_list.pop_front();
i=m_list.begin();
}
// Update them
//
for(i=m_list.begin();i!=m_list.end();i++)
{
i->x1+=i->dx;
i->y1+=i->dy;
i->z1+=i->dz;
i->x2+=i->dx;
i->y2+=i->dy;
i->z2+=i->dz;
i->alpha-=m_alpha_dec;
}
}
void Sparks::draw()
{
list<Point>::iterator i;
// Draw them
//
glBegin(GL_LINES);
for(i=m_list.begin();i!=m_list.end();i++)
{
glColor4f(1.0,1.0,0.0,i->alpha);
glVertex3f(i->x1,i->y1,i->z1);
glColor4f(0.5,0.0,0.0,i->alpha);
glVertex3f(i->x2,i->y2,i->z2);
}
glEnd();
}
// END OF FILE //
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