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1 files changed, 123 insertions, 0 deletions

diff --git a/sparks.cpp b/sparks.cpp
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+++ b/sparks.cpp
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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 //