/*

     File: AppController.m

 Abstract: Create a fire effect using emitter layers

  Version: 1.1

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 */

#import "AppController.h"

@interface AppController (Internal)

-(CGImageRef)CGImageNamed:(NSString*)name;

@end

@implementation AppController

-(void)awakeFromNib {

    //Create the root layer

    rootLayer = [CALayer layer];

    //Set the root layer's background color to black

    rootLayer.backgroundColor = CGColorGetConstantColor(kCGColorBlack);

    //Create the fire emitter layer

    fireEmitter = [CAEmitterLayer layer];

    fireEmitter.emitterPosition = CGPointMake(225, 50);

    fireEmitter.emitterMode = kCAEmitterLayerOutline;

    fireEmitter.emitterShape = kCAEmitterLayerLine;

    fireEmitter.renderMode = kCAEmitterLayerAdditive;

    fireEmitter.emitterSize = CGSizeMake(0, 0);

    //Create the smoke emitter layer

    smokeEmitter = [CAEmitterLayer layer];

    smokeEmitter.emitterPosition = CGPointMake(225, 50);

    smokeEmitter.emitterMode = kCAEmitterLayerPoints;

    //Create the fire emitter cell

    CAEmitterCell* fire = [CAEmitterCell emitterCell];

    fire.emissionLongitude = M_PI;

    fire.birthRate = 0;

    fire.velocity = 80;

    fire.velocityRange = 30;

    fire.emissionRange = 1.1;

    fire.yAcceleration = 200;

    fire.scaleSpeed = 0.3;

    CGColorRef color = CGColorCreateGenericRGB(0.8, 0.4, 0.2, 0.10);

    fire.color = color;

    CGColorRelease(color);

    fire.contents = (id) [self CGImageNamed:@"fire.png"];

    //Name the cell so that it can be animated later using keypaths

    [fire setName:@"fire"];

    //Add the fire emitter cell to the fire emitter layer

    fireEmitter.emitterCells = [NSArray arrayWithObject:fire] ;

    //Create the smoke emitter cell

    CAEmitterCell* smoke = [CAEmitterCell emitterCell];

    smoke.birthRate = 11;

    smoke.emissionLongitude = M_PI / 2;

    smoke.lifetime = 0;

    smoke.velocity = 40;

    smoke.velocityRange = 20;

    smoke.emissionRange = M_PI / 4;

    smoke.spin = 1;

    smoke.spinRange = 6;

    smoke.yAcceleration = 160;

    smoke.contents = (id) [self CGImageNamed:@"smoke.png"];

    smoke.scale = 0.1;

    smoke.alphaSpeed = -0.12;

    smoke.scaleSpeed = 0.7;

    //Name the cell so that it can be animated later using keypaths

    [smoke setName:@"smoke"];

    //Add the smoke emitter cell to the smoke emitter layer

    smokeEmitter.emitterCells = [NSArray arrayWithObject:smoke];

    //Add the two emitter layers to the root layer

    [rootLayer addSublayer:smokeEmitter];

    [rootLayer addSublayer:fireEmitter];

    //Set the view's layer to the base layer

    [view setLayer:rootLayer];

    [view setWantsLayer:YES];

    //Set the fire simulation to reflect the initial slider position

    [self slidersChanged:self];

    //Force the view to update

    [view setNeedsDisplay:YES];

}

//Update the emitters when the slider value changes

-(IBAction)slidersChanged:(id)sender {

    //Query the gasSlider's value

    float gas = [gasSlider intValue] / 100.0;

    //Update the fire properties

    [fireEmitter setValue:[NSNumber numberWithInt:(gas * 1000)] forKeyPath:@"emitterCells.fire.birthRate"];

    [fireEmitter setValue:[NSNumber numberWithFloat:gas] forKeyPath:@"emitterCells.fire.lifetime"];

    [fireEmitter setValue:[NSNumber numberWithFloat:(gas * 0.35)] forKeyPath:@"emitterCells.fire.lifetimeRange"];

    fireEmitter.emitterSize = CGSizeMake(50 * gas, 0);

    //Update the smoke properites

    [smokeEmitter setValue:[NSNumber numberWithInt:gas * 4] forKeyPath:@"emitterCells.smoke.lifetime"];

    CGColorRef color = CGColorCreateGenericRGB(1, 1, 1, gas * 0.3);

    [smokeEmitter setValue:(id)color forKeyPath:@"emitterCells.smoke.color"];

    CGColorRelease(color);

}

//Return a CGImageRef from the specified image file in the app's bundle

-(CGImageRef)CGImageNamed:(NSString*)name {

    CFURLRef url = (CFURLRef) [[NSBundle mainBundle] URLForResource:name withExtension:nil];

    CGImageSourceRef source = CGImageSourceCreateWithURL(url, NULL);

    CGImageRef image = CGImageSourceCreateImageAtIndex(source, 0, NULL);

    CFRelease(source);

    return (CGImageRef)[NSMakeCollectable(image) autorelease];

}

@end