EmittingCell Sample

DSAppDelegate.m

//
//  DSAppDelegate.m
//  DrawSmoke
//
//  Created by developer on 12/03/27.
//  Copyright (c) 2012 your good mind. All rights reserved.
//

#import "DSAppDelegate.h"
#import <QuartzCore/QuartzCore.h>

#if __has_feature(objc_arc)
#define ARC_ON
#define AUTORELEASE(A) A
#define RETAIN(A) A
#define RELEASE(A) 
#else
#define ARC_OFF
#define AUTORELEASE(A) [A autorelease]
#define RETAIN(A) [A retain]
#define RELEASE(A) [A release]
#endif

//
// SmokeView
//
@interface DSSmokeView : UIView

@end

@implementation DSSmokeView

-(id) initWithFrame:(CGRect)frame {
  if ((self = [super initWithFrame:frame]) != nil) {
	CAEmitterLayer* fireEmitter = (CAEmitterLayer*)self.layer;
	fireEmitter.emitterPosition = CGPointMake(self.bounds.size.width/2, self.bounds.size.height);
	fireEmitter.emitterMode     = kCAEmitterLayerSurface; //kCAEmitterLayerOutline;
	fireEmitter.emitterShape    = kCAEmitterLayerLine; // kCAEmitterLayerSphere; kCAEmitterLayerCircle; kCAEmitterLayerPoint;
	fireEmitter.emitterSize     = CGSizeMake(self.bounds.size.width/5,self.bounds.size.width/5 );
 
	float gas=.6;
	CAEmitterCell *smoke = [CAEmitterCell emitterCell];
	smoke.BirthRate             = 0;//11;
	smoke.emissionLongitude     = -M_PI ;
	smoke.emissionLatitude      = -M_PI;
	smoke.lifetime              = gas*4;
	smoke.Velocity              = 40;
	smoke.VelocityRange         = 20;
	smoke.emissionRange         = M_PI / 4;
	smoke.Spin                  = 1;
	smoke.SpinRange             = 6;
	smoke.yAcceleration         = -160;
	smoke.Scale                 = 0.3f;
	smoke.AlphaSpeed            = -0.22f;
	smoke.ScaleSpeed            = 0.7f;
	smoke.color                 = [[UIColor colorWithRed:1 green:1 blue:1 alpha:0.3*gas] CGColor];
	smoke.contents              = (id)[[UIImage imageNamed:@"smoke.png"] CGImage];
	[smoke setName:@"smoke"];
 
	fireEmitter.emitterCells = [NSArray arrayWithObject:smoke];
  }
  return self;
}

+ (Class) layerClass {
  //configure the UIView to have emitter layer
  return [CAEmitterLayer class];
}

-(void)setEmitterPositionFromTouch: (UITouch*)t {
  CAEmitterLayer* smokeEmitter = (CAEmitterLayer*)self.layer;
  //change the emitter's position
  smokeEmitter.emitterPosition = [t locationInView:self];
}

-(void)setIsEmitting:(BOOL)isEmitting {
  CAEmitterLayer* smokeEmitter = (CAEmitterLayer*)self.layer;
  //turn on/off the emitting of particles
  [smokeEmitter setValue:[NSNumber numberWithInt:isEmitting?50:0] forKeyPath:@"emitterCells.smoke.birthRate"];
}

@end

//
// ViewController
//
@interface DSViewController : UIViewController

@end

@implementation DSViewController

-(void) loadView {
  CGRect screen = [[UIScreen mainScreen] bounds];
  DSSmokeView* smoke = [[DSSmokeView alloc] initWithFrame:screen];
  smoke.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  smoke.backgroundColor = [UIColor whiteColor];
  self.view = smoke;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
  return YES;
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  [(DSSmokeView*)self.view setEmitterPositionFromTouch: [touches anyObject]];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  [(DSSmokeView*)self.view setEmitterPositionFromTouch: [touches anyObject]];
  [(DSSmokeView*)self.view setIsEmitting:YES];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
  [(DSSmokeView*)self.view setIsEmitting:NO];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
  [(DSSmokeView*)self.view setIsEmitting:NO];
}

@end

//
// DSAppDelegate
//
//
// Header File
// #import <UIKit/UIKit.h>
//
// @interface DSAppDelegate : UIResponder <UIApplicationDelegate>
//
// @property (strong, nonatomic) UIWindow *window;
//
// @end
//
//
//
//
@implementation DSAppDelegate

@synthesize window = _window;

#ifdef ARC_OFF
- (void)dealloc {
    [_window release];
    [super dealloc];
}
#endif

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
	self.window.rootViewController = AUTORELEASE([[DSViewController alloc] initWithNibName:nil bundle:nil]);
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {}
- (void)applicationDidEnterBackground:(UIApplication *)application {}
- (void)applicationWillEnterForeground:(UIApplication *)application {}
- (void)applicationDidBecomeActive:(UIApplication *)application {}
- (void)applicationWillTerminate:(UIApplication *)application {}

@end