/* |
File: AppController.m |
Abstract: Create a fireworks simulation using particles, respond to user actions |
Version: 1.0 |
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Copyright (C) 2009 Apple Inc. All Rights Reserved. |
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*/ |
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#import "AppController.h" |
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@implementation AppController |
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-(void)awakeFromNib { |
//Create the root layer |
rootLayer = [CALayer layer]; |
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//Set the root layer's attributes |
rootLayer.bounds = CGRectMake(0, 0, 640, 480); |
CGColorRef color = CGColorCreateGenericRGB(0.0, 0.0, 0.0, 1); |
rootLayer.backgroundColor = color; |
CGColorRelease(color); |
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//Load the spark image for the particle |
const char* fileName = [[[NSBundle mainBundle] pathForResource:@"tspark" ofType:@"png"] UTF8String]; |
CGDataProviderRef dataProvider = CGDataProviderCreateWithFilename(fileName); |
id img = (id) CGImageCreateWithPNGDataProvider(dataProvider, NULL, NO, kCGRenderingIntentDefault); |
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mortor = [[CAEmitterLayer layer] retain]; |
mortor.emitterPosition = CGPointMake(320, 0); |
mortor.renderMode = kCAEmitterLayerAdditive; |
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//Invisible particle representing the rocket before the explosion |
CAEmitterCell *rocket = [[CAEmitterCell emitterCell] retain]; |
rocket.emissionLongitude = M_PI / 2; |
rocket.emissionLatitude = 0; |
rocket.lifetime = 1.6; |
rocket.birthRate = 1; |
rocket.velocity = 400; |
rocket.velocityRange = 100; |
rocket.yAcceleration = -250; |
rocket.emissionRange = M_PI / 4; |
color = CGColorCreateGenericRGB(0.5, 0.5, 0.5, 0.5); |
rocket.color = color; |
CGColorRelease(color); |
rocket.redRange = 0.5; |
rocket.greenRange = 0.5; |
rocket.blueRange = 0.5; |
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//Name the cell so that it can be animated later using keypath |
[rocket setName:@"rocket"]; |
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//Flare particles emitted from the rocket as it flys |
CAEmitterCell *flare = [CAEmitterCell emitterCell]; |
flare.contents = img; |
flare.emissionLongitude = (4 * M_PI) / 2; |
flare.scale = 0.4; |
flare.velocity = 100; |
flare.birthRate = 45; |
flare.lifetime = 1.5; |
flare.yAcceleration = -350; |
flare.emissionRange = M_PI / 7; |
flare.alphaSpeed = -0.7; |
flare.scaleSpeed = -0.1; |
flare.scaleRange = 0.1; |
flare.beginTime = 0.01; |
flare.duration = 0.7; |
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//The particles that make up the explosion |
CAEmitterCell *firework = [CAEmitterCell emitterCell]; |
firework.contents = img; |
firework.birthRate = 9999; |
firework.scale = 0.6; |
firework.velocity = 130; |
firework.lifetime = 2; |
firework.alphaSpeed = -0.2; |
firework.yAcceleration = -80; |
firework.beginTime = 1.5; |
firework.duration = 0.1; |
firework.emissionRange = 2 * M_PI; |
firework.scaleSpeed = -0.1; |
firework.spin = 2; |
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//Name the cell so that it can be animated later using keypath |
[firework setName:@"firework"]; |
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//preSpark is an invisible particle used to later emit the spark |
CAEmitterCell *preSpark = [CAEmitterCell emitterCell]; |
preSpark.birthRate = 80; |
preSpark.velocity = firework.velocity * 0.70; |
preSpark.lifetime = 1.7; |
preSpark.yAcceleration = firework.yAcceleration * 0.85; |
preSpark.beginTime = firework.beginTime - 0.2; |
preSpark.emissionRange = firework.emissionRange; |
preSpark.greenSpeed = 100; |
preSpark.blueSpeed = 100; |
preSpark.redSpeed = 100; |
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//Name the cell so that it can be animated later using keypath |
[preSpark setName:@"preSpark"]; |
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//The 'sparkle' at the end of a firework |
CAEmitterCell *spark = [CAEmitterCell emitterCell]; |
spark.contents = img; |
spark.lifetime = 0.05; |
spark.yAcceleration = -250; |
spark.beginTime = 0.8; |
spark.scale = 0.4; |
spark.birthRate = 10; |
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preSpark.emitterCells = [NSArray arrayWithObjects:spark, nil]; |
rocket.emitterCells = [NSArray arrayWithObjects:flare, firework, preSpark, nil]; |
mortor.emitterCells = [NSArray arrayWithObjects:rocket, nil]; |
[rootLayer addSublayer:mortor]; |
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//Set the view's layer to the base layer |
[theView setLayer:rootLayer]; |
[theView setWantsLayer:YES]; |
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//Force the view to update |
[theView setNeedsDisplay:YES]; |
} |
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//Update particle properites based on the slider values |
-(IBAction)slidersMoved:(id)sender { |
[mortor setValue:[NSNumber numberWithFloat:[rocketRange floatValue] * M_PI / 4] |
forKeyPath:@"emitterCells.rocket.emissionRange"]; |
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[mortor setValue:[NSNumber numberWithFloat:[rocketVelocity floatValue]] |
forKeyPath:@"emitterCells.rocket.velocity"]; |
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[mortor setValue:[NSNumber numberWithFloat:[rocketVelocityRange floatValue]] |
forKeyPath:@"emitterCells.rocket.velocityRange"]; |
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[mortor setValue:[NSNumber numberWithFloat:(-1 * [rocketGravity floatValue])] |
forKeyPath:@"emitterCells.rocket.yAcceleration"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkRange floatValue] * M_PI / 4] |
forKeyPath:@"emitterCells.rocket.emitterCells.firework.emissionRange"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkVelocity floatValue]] |
forKeyPath:@"emitterCells.rocket.emitterCells.firework.velocity"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkVelocityRange floatValue]] |
forKeyPath:@"emitterCells.rocket.emitterCells.firework.velocityRange"]; |
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[mortor setValue:[NSNumber numberWithFloat:(-1 * [fireworkGravity floatValue])] |
forKeyPath:@"emitterCells.rocket.emitterCells.firework.yAcceleration"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkVelocity floatValue] * 0.70] |
forKeyPath:@"emitterCells.rocket.emitterCells.preSpark.velocity"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkGravity floatValue] * -0.85] |
forKeyPath:@"emitterCells.rocket.emitterCells.preSpark.yAcceleration"]; |
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[mortor setValue:[NSNumber numberWithFloat:[fireworkRange floatValue] * M_PI / 4] |
forKeyPath:@"emitterCells.rocket.emitterCells.preSpark.emissionRange"]; |
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mortor.speed = [animationSpeed floatValue] / 100.0; |
} |
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//Reset the slider positions to the default values |
-(IBAction)resetSliders:(id)sender { |
[rocketRange setIntValue:1]; |
[rocketVelocity setIntValue:400]; |
[rocketVelocityRange setIntValue:100]; |
[rocketGravity setIntValue:250]; |
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[fireworkRange setIntValue:8]; |
[fireworkVelocity setIntValue:130]; |
[fireworkVelocityRange setIntValue:0]; |
[fireworkGravity setIntValue:80]; |
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[animationSpeed setIntValue:100]; |
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[self slidersMoved:self]; |
} |
@end |
