Oolite 1.91.0.7644-241112-7f5034b
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OORingEffectEntity.m
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1/*
2
3OORingEffectEntity.m
4
5
6Oolite
7Copyright (C) 2004-2013 Giles C Williams and contributors
8
9This program is free software; you can redistribute it and/or
10modify it under the terms of the GNU General Public License
11as published by the Free Software Foundation; either version 2
12of the License, or (at your option) any later version.
13
14This program is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with this program; if not, write to the Free Software
21Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22MA 02110-1301, USA.
23
24*/
25
27#import "Universe.h"
28#import "OOMacroOpenGL.h"
29
30
31#define kRingDuration (2.0f) // seconds
32#define kRingAttack (0.4f) // fade-up time
33
34// Dimensions and growth rates per second in terms of base size.
35#define kInnerRingInitialSizeFactor (0.5f)
36#define kOuterRingInitialSizeFactor (1.25f * kInnerRingInitialSizeFactor)
37#define kInnerRingGrowthRateFactor (1.1f * kInnerRingInitialSizeFactor)
38#define kOuterRingGrowthRateFactor (1.25f * kInnerRingInitialSizeFactor)
39
40// These factors produce a ring that shrinks to nothing, then expands to the size of a "normal" ring.
41#define kShrinkingRingInnerGrowthFactor (-2.5)
42#define kShrinkingRingOuterGrowthFactor (-2.0)
43
44
45enum
46{
48};
49static struct { float x, y; } sCircleVerts[kCircleSegments]; // holds vector coordinates for a unit circle
50
51
52@implementation OORingEffectEntity
53
54+ (void)initialize
55{
56 unsigned i;
57 for (i = 0; i < kCircleSegments; i++)
58 {
59 sCircleVerts[i].x = sinf(i * 2 * M_PI / (kCircleSegments - 1));
60 sCircleVerts[i].y = cosf(i * 2 * M_PI / (kCircleSegments - 1));
61 }
62}
63
64
65- (id) initRingFromEntity:(Entity *)sourceEntity
66{
67 if (sourceEntity == nil)
68 {
69 [self release];
70 return nil;
71 }
72
73 if ((self = [super init]))
74 {
75 GLfloat baseSize = [sourceEntity collisionRadius];
80
81 [self setPosition:[sourceEntity position]];
82 [self setOrientation:[sourceEntity orientation]];
83 [self setVelocity:[sourceEntity velocity]];
84
85 [self setStatus:STATUS_EFFECT];
86 [self setScanClass:CLASS_NO_DRAW];
87
88 [self setOwner:sourceEntity];
89 }
90
91 return self;
92}
93
94
95+ (instancetype) ringFromEntity:(Entity *)sourceEntity
96{
97 return [[[self alloc] initRingFromEntity:sourceEntity] autorelease];
98}
99
100
101+ (instancetype) shrinkingRingFromEntity:(Entity *)sourceEntity
102{
103 OORingEffectEntity *result = [self ringFromEntity:sourceEntity];
104 if (result != nil)
105 {
108 }
109 return result;
110}
111
112
113- (NSString *) descriptionComponents
114{
115 return [NSString stringWithFormat:@"%f seconds passed of %f", _timePassed, kRingDuration];
116}
117
118
119- (void) update:(OOTimeDelta) delta_t
120{
121 [super update:delta_t];
122 _timePassed += delta_t;
123
124 _innerRadius += delta_t * _innerGrowthRate;
125 _outerRadius += delta_t * _outerGrowthRate;
126
128 {
129 [UNIVERSE removeEntity:self];
130 }
131}
132
133
134- (void) drawImmediate:(bool)immediate translucent:(bool)translucent
135{
136 if (!translucent || [UNIVERSE breakPatternHide]) return;
137
140
141 GLfloat alpha = OOClamp_0_1_f((kRingDuration - _timePassed) / kRingAttack);
142
143 GLfloat ex_em_hi[4] = {0.6, 0.8, 1.0, alpha}; // pale blue
144 GLfloat ex_em_lo[4] = {0.2, 0.0, 1.0, 0.0}; // purplish-blue-black
145
146 OOGLBEGIN(GL_TRIANGLE_STRIP);
147 for (unsigned i = 0; i < kCircleSegments; i++)
148 {
149 glColor4fv(ex_em_lo);
150 glVertex3f(_innerRadius * sCircleVerts[i].x, _innerRadius * sCircleVerts[i].y, 0.0f);
151 glColor4fv(ex_em_hi);
152 glVertex3f(_outerRadius * sCircleVerts[i].x, _outerRadius * sCircleVerts[i].y, 0.0f);
153 }
154 OOGLEND();
155
157 OOCheckOpenGLErrors(@"OOQuiriumCascadeEntity after drawing %@", self);
158}
159
160
161- (BOOL) isEffect
162{
163 return YES;
164}
165
166
167- (BOOL) canCollide
168{
169 return NO;
170}
171
172@end
#define OO_ENTER_OPENGL()
#define M_PI
Definition OOMaths.h:73
#define OOGLBEGIN
Definition OOOpenGL.h:253
@ OPENGL_STATE_ADDITIVE_BLENDING
Definition OOOpenGL.h:125
#define OOVerifyOpenGLState()
Definition OOOpenGL.h:136
BOOL OOCheckOpenGLErrors(NSString *format,...)
Definition OOOpenGL.m:39
#define OOSetOpenGLState(STATE)
Definition OOOpenGL.h:135
#define OOGLEND
Definition OOOpenGL.h:254
return nil
#define kRingDuration
@ kCircleSegments
#define kOuterRingGrowthRateFactor
#define kRingAttack
static struct @11 sCircleVerts[kCircleSegments]
#define kInnerRingGrowthRateFactor
float y
#define kShrinkingRingInnerGrowthFactor
#define kOuterRingInitialSizeFactor
float x
#define kInnerRingInitialSizeFactor
#define kShrinkingRingOuterGrowthFactor
double OOTimeDelta
Definition OOTypes.h:224
#define UNIVERSE
Definition Universe.h:833
Quaternion orientation
Definition Entity.h:114
GLfloat collisionRadius()
Definition Entity.m:905
HPVector position
Definition Entity.h:112
Vector velocity
Definition Entity.h:140
id init()
Definition Entity.m:68
NSString * descriptionComponents()