OOECMBlastEntity.m

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/*
 
OOECMBlastEntity.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 "OOECMBlastEntity.h"
#import "Universe.h"
#import "ShipEntity.h"
#import "OOEntityFilterPredicate.h"
#import "OOJavaScriptEngine.h"
 
 
// NOTE: these values are documented for scripting, be careful about changing them.
#define ECM_EFFECT_DURATION     2.0
#define ECM_PULSE_COUNT         4
#define ECM_PULSE_INTERVAL      (ECM_EFFECT_DURATION / (double)ECM_PULSE_COUNT)
 
#define ECM_DEBUG_DRAW          0
 
 
#if ECM_DEBUG_DRAW
#import "OODebugGLDrawing.h"
#endif
 
 
@implementation OOECMBlastEntity
 
- (id) initFromShip:(ShipEntity *)ship
{
    if (ship == nil)
    {
        DESTROY(self);
    }
    else if ((self = [super init]))
    {
        _blastsRemaining = ECM_PULSE_COUNT;
        _nextBlast = ECM_PULSE_INTERVAL;
        _ship = [ship weakRetain];
        
        [self setPosition:[ship position]];
        
        [self setStatus:STATUS_EFFECT];
        [self setScanClass:CLASS_NO_DRAW];
    }
    
    return self;
}
 
 
- (void) update:(OOTimeDelta)delta_t
{
    _nextBlast -= delta_t;
    ShipEntity      *ship = [_ship weakRefUnderlyingObject];
    BOOL            validShip = (ship != nil) && ([ship status] != STATUS_DEAD);
    
    if (_nextBlast <= 0.0 && validShip)
    {
        // Do ECM stuff.
        double radius = OOClamp_0_1_d((double)(ECM_PULSE_COUNT - _blastsRemaining + 1) * 1.0 / (double)ECM_PULSE_COUNT);
        radius *= SCANNER_MAX_RANGE;
        _blastsRemaining--;
        
        NSArray *targets = [UNIVERSE findEntitiesMatchingPredicate:IsShipPredicate
                                                         parameter:NULL
                                                           inRange:radius
                                                          ofEntity:self];
        NSUInteger i, count = [targets count];
        if (count > 0)
        {
            JSContext *context = OOJSAcquireContext();
            jsval ecmPulsesRemaining = INT_TO_JSVAL(_blastsRemaining);
            jsval whomVal = OOJSValueFromNativeObject(context, ship);
            
            for (i = 0; i < count; i++)
            {
                ShipEntity *target = [targets objectAtIndex:i];
                ShipScriptEvent(context, target, "shipHitByECM", ecmPulsesRemaining, whomVal);
                [target reactToAIMessage:@"ECM" context:nil];
                [target noticeECM];
            }
            
            OOJSRelinquishContext(context);
        }
        _nextBlast += ECM_PULSE_INTERVAL;
    }
    
    if (_blastsRemaining == 0 || !validShip)  [UNIVERSE removeEntity:self];
}
 
 
- (void) drawImmediate:(bool)immediate translucent:(bool)translucent
{
#if ECM_DEBUG_DRAW && OO_DEBUG
    OODebugDrawPoint(kZeroVector, [OOColor cyanColor]);
#endif
    // Else do nothing, we're invisible!
}
 
 
- (BOOL) isECMBlast
{
    return YES;
}
 
@end
 
 
@implementation Entity (OOECMBlastEntity)
 
- (BOOL) isECMBlast
{
    return NO;
}
 
@end