OOQuiriumCascadeEntity.m

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/*
 
OOQuiriumCascadeEntity.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 "OOQuiriumCascadeEntity.h"
#import "PlayerEntity.h"
#import "Universe.h"
#import "OOMacroOpenGL.h"
 
 
#define kQuiriumCascadeDuration         (20.0)  // seconds
#define kQuiriumCollisionDelay          (0.05)  // seconds before we start colliding with and damaging things.
 
 
@implementation OOQuiriumCascadeEntity
 
- (id) initQuiriumCascadeFromShip:(ShipEntity *)ship
{
    if (ship == nil)
    {
        [self release];
        return nil;
    }
    
    if ((self = [super init]))
    {
        [self setPosition:[ship position]];
        
        [self setStatus:STATUS_EFFECT];
        scanClass = CLASS_MINE;
        
        [self setOwner:[ship owner]];
        
        // Red and green channels are animated.
        _color[2] = 1.0f;
        _color[3] = 0.5f;
    }
    
    return self;
}
 
 
+ (instancetype) quiriumCascadeFromShip:(ShipEntity *)ship
{
    return [[[self alloc] initQuiriumCascadeFromShip:ship] autorelease];
}
 
 
- (NSString *) descriptionComponents
{
    return [NSString stringWithFormat:@"%f seconds passed of %f", _timePassed, kQuiriumCascadeDuration];
}
 
 
- (void) update:(OOTimeDelta) delta_t
{
    [super update:delta_t];
    _timePassed += delta_t;
    
    rotMatrix = OOMatrixForBillboard(position, [PLAYER position]);
    
    GLfloat tf = _timePassed / kQuiriumCascadeDuration;
    GLfloat stf = tf * tf;
    GLfloat expansionSpeed = 0.0;
    if (_timePassed > 0)    // Avoid divide by 0
    {
        expansionSpeed = fmin(240.0f + 10.0f / (tf * tf), 1000.0f);
    }
    
    collision_radius += delta_t * expansionSpeed;       // expand
    energy = delta_t * (100000 - 90000 * tf);   // adjusted to take into account delta_t
    
    _color[3] = OOClamp_0_1_f(0.5f * ((0.025f / tf) + 1.0f - stf));
    
    _color[0] = _color[1] = fmin(1.0f - 5.0f * tf, 1.0f);
    if (_color[0] < 0.0f)
    {
        _color[0] = 0.25f * tf * randf();
        _color[1] = 0.0f;
    }
 
    // manage collisions
    Entity *owner = [self owner];
    Entity *e = nil;
    foreach (e, collidingEntities)
    {
        // we're going to force the weapon id to be the qbomb key here, because at this point the cascade entity isn't a ship any more
        // and there's no link back to the original.
        [e takeEnergyDamage:energy from:self becauseOf:owner weaponIdentifier:@"EQ_QC_MINE"];
    }
    
    // expire after ttl
    if (_timePassed > kQuiriumCascadeDuration)
    {
        [UNIVERSE removeEntity:self];
    }
}
 
 
- (void) drawImmediate:(bool)immediate translucent:(bool)translucent
{
    if (!translucent || [UNIVERSE breakPatternHide])  return;
    
    OO_ENTER_OPENGL();
    OOSetOpenGLState(OPENGL_STATE_ADDITIVE_BLENDING);
    
    OOGL(glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT));
    
    OOGL(glDisable(GL_CULL_FACE));
    OOGL(glDisable(GL_TEXTURE_2D));
    OOGL(glEnable(GL_BLEND));
    OOGL(glBlendFunc(GL_SRC_ALPHA, GL_ONE));
    
    OOGL(glColor4fv(_color));
    OOGLBEGIN(GL_TRIANGLE_FAN);
        GLDrawBallBillboard(collision_radius, 4, sqrt(cam_zero_distance));
    OOGLEND();
    
    OOGL(glPopAttrib());
    
    OOVerifyOpenGLState();
    OOCheckOpenGLErrors(@"OOQuiriumCascadeEntity after drawing %@", self);
}
 
 
- (BOOL) isEffect
{
    return YES;
}
 
 
- (BOOL) isCascadeWeapon
{
    return YES;
}
 
 
- (BOOL) canCollide
{
    return _timePassed > kQuiriumCollisionDelay;
}
 
 
- (BOOL) checkCloseCollisionWith:(Entity *)other
{
    return YES;
}
 
@end
 
 
@implementation Entity (OOQuiriumCascadeExtensions)
 
- (BOOL) isCascadeWeapon
{
    return NO;
}
 
@end