OOPlasmaShotEntity.m

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/*
 
OOPlasmaShotEntity.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 "OOPlasmaShotEntity.h"
#import "Universe.h"
#import "PlayerEntity.h"
#import "OOColor.h"
#import "OOPlasmaBurstEntity.h"
 
 
#define kPlasmaShotSize             12.0f
#define kPlasmaShotActivationDelay  0.05f
 
 
/*  If nonzero, plasma shots fade with distance. Bits of this were in the old
    ParticleEntity code, but I think it was disabled on purpose.
    -- Ahruman 2009-09-25
*/
#define PLASMA_ATTENUATION 0
 
 
@implementation OOPlasmaShotEntity
 
- (id) initWithPosition:(HPVector)inPosition
               velocity:(Vector)inVelocity
                 energy:(float)inEnergy
               duration:(OOTimeDelta)duration
                  color:(OOColor *)color
{
    if ((self = [super initWithDiameter:kPlasmaShotSize]))
    {
        [self setPosition:inPosition];
        [self setVelocity:inVelocity];
        [self setCollisionRadius:2.0];
        
        [self setColor:color alpha:1.0];
        _colorComponents[3] = 1.0f;
        
        [self setEnergy:inEnergy];
        _duration = duration;
    }
    
    return self;
}
 
 
- (BOOL) canCollide
{
    return [UNIVERSE getTime] > [self spawnTime] + kPlasmaShotActivationDelay;
}
 
 
- (BOOL) checkCloseCollisionWith:(Entity *)other
{
    return ([other rootShipEntity] != [self owner]) && ![other isEffect];
}
 
 
- (void) update:(double)delta_t
{
    [super update:delta_t];
    
    OOTimeDelta lifeTime = [self timeElapsedSinceSpawn];
    
#if PLASMA_ATTENUATION
    float attenuation = OOClamp_0_1_f(1.0f - lifeTime / _duration);
#else
    const float attenuation = 1.0f;
#endif
    
    NSUInteger i, count = [collidingEntities count];
    for (i = 0; i < count; i++)
    {
        Entity *e = (Entity *)[collidingEntities objectAtIndex:i];
        if ([e rootShipEntity] != [self owner])
        {
            // we're going to force the weapon id to be a phantom equipment key so there is something for 
            // the PlayerEntitySound to reference. it allow allows for the sound effects to be overridden by OXP.
            [e takeEnergyDamage:[self energy] * attenuation
                           from:self
                      becauseOf:[self owner]
               weaponIdentifier:@"EQ_WEAPON_PLASMA_SHOT"];
            [UNIVERSE removeEntity:self];
            
            // Spawn a plasma burst.
            OOPlasmaBurstEntity *burst = [[OOPlasmaBurstEntity alloc] initWithPosition:[self position]];
            [UNIVERSE addEntity:burst];
            [burst release];
        }
    }
    
#if PLASMA_ATTENUATION
    _colorComponents[3] = attenuation;
#endif
    
    if (lifeTime > _duration)  [UNIVERSE removeEntity:self];
}
 
@end