Line data    Source code

       1           0 : /*
       2             : 
       3             : OOSparkEntity.m
       4             : 
       5             : 
       6             : Oolite
       7             : Copyright (C) 2004-2013 Giles C Williams and contributors
       8             : 
       9             : This program is free software; you can redistribute it and/or
      10             : modify it under the terms of the GNU General Public License
      11             : as published by the Free Software Foundation; either version 2
      12             : of the License, or (at your option) any later version.
      13             : 
      14             : This program is distributed in the hope that it will be useful,
      15             : but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             : GNU General Public License for more details.
      18             : 
      19             : You should have received a copy of the GNU General Public License
      20             : along with this program; if not, write to the Free Software
      21             : Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
      22             : MA 02110-1301, USA.
      23             : 
      24             : */
      25             : 
      26             : #import "OOSparkEntity.h"
      27             : #import "Universe.h"
      28             : #import "PlayerEntity.h"
      29             : #import "OOColor.h"
      30             : 
      31             : 
      32             : @interface OOSparkEntity (Private)
      33             : 
      34           0 : - (void) performUpdate:(OOTimeDelta)delta_t;
      35             : 
      36             : @end
      37             : 
      38             : 
      39             : @implementation OOSparkEntity
      40             : 
      41             : - (id) initWithPosition:(HPVector)pos
      42             :                            velocity:(Vector)vel
      43             :                            duration:(OOTimeDelta)duration
      44             :                                    size:(float)size
      45             :                                   color:(OOColor *)color
      46             : {
      47             :         if ((self = [super initWithDiameter:size]))
      48             :         {
      49             :                 [self setPosition:pos];
      50             :                 [self setVelocity:vel];
      51             :                 _duration = _timeRemaining = duration;
      52             :                 [self setCollisionRadius:2.0];
      53             :                 
      54             :                 [color getRed:&_baseRGBA[0] green:&_baseRGBA[1] blue:&_baseRGBA[2] alpha:&_baseRGBA[3]];
      55             :                 [self performUpdate:0]; // Handle colour mixing and such.
      56             :         }
      57             :         
      58             :         return self;
      59             : }
      60             : 
      61             : 
      62           0 : - (void) update:(OOTimeDelta)delta_t
      63             : {
      64             :         [super update:delta_t];
      65             :         [self performUpdate:delta_t];
      66             : }
      67             : 
      68             : 
      69           0 : - (void) performUpdate:(OOTimeDelta)delta_t
      70             : {
      71             :         _timeRemaining -= delta_t;
      72             :         
      73             :         float mix = OOClamp_0_1_f(_timeRemaining / _duration);
      74             :         
      75             :         // Fade towards red while fading out.
      76             :         _colorComponents[0] = mix * _baseRGBA[0] + (1.0f - mix);
      77             :         _colorComponents[1] = mix * _baseRGBA[1];
      78             :         _colorComponents[2] = mix * _baseRGBA[2];
      79             :         _colorComponents[3] = mix * _baseRGBA[3];
      80             :         
      81             :         // Disappear when gone.
      82             :         if (mix == 0)  [UNIVERSE removeEntity:self];
      83             : }
      84             : 
      85             : @end