OOPlasmaBurstEntity.m

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/*
 
OOPlasmaBurstEntity.m
 
 
Oolite
Copyright (C) 2004-2013 Giles C Williams and contributors
 
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
 
*/
 
#import "OOPlasmaBurstEntity.h"
#import "Universe.h"
 
 
#define kPlasmaBurstInitialSize     64.0f
#define kPlasmaBurstGrowthRate      64.0f
#define kPlasmaBurstDuration        2.0f
 
 
@implementation OOPlasmaBurstEntity
 
- (id) initWithPosition:(HPVector)inPosition
{
    if ((self = [super initWithDiameter:kPlasmaBurstInitialSize]))
    {
        [self setPosition:inPosition];
        [self setCollisionRadius:2.0];
        
        [self setColor:[OOColor redColor]];
    }
    
    return self;
}
 
 
- (void) update:(double)delta_t
{
    [super update:delta_t];
    
    OOTimeDelta lifeTime = [self timeElapsedSinceSpawn];
    float attenuation = OOClamp_0_1_f(1.0f - lifeTime / kPlasmaBurstDuration);
    
    _diameter = kPlasmaBurstInitialSize + lifeTime * kPlasmaBurstGrowthRate;
    
    _colorComponents[3] = attenuation;
    
    if (lifeTime > kPlasmaBurstDuration)  [UNIVERSE removeEntity:self];
}
 
@end