IOS Animation--The Fireworks effect example detailed _ios

Caemitterlayer provides a Core Animation particle launch System that enables a variety of particle animation effects. The effect of the fireworks here is based on Caemitterlayer.

Fire.gif

-(void) viewdidload {[Super viewdidload];
[Self makefireworksdisplay];
 }-(void) Makefireworksdisplay {//Particle Launch System initialization caemitterlayer *fireworksemitter = [Caemitterlayer layer];
 CGRect viewbounds = self.view.layer.bounds;
 The location of the emitter is fireworksemitter.emitterposition = Cgpointmake (viewbounds.size.width/2.0, viewBounds.size.height);
 Emission source Size fireworksemitter.emittersize = Cgsizemake (viewbounds.size.width/2.0, 0.0);
 Launch mode fireworksemitter.emittermode = Kcaemitterlayeroutline;
 The shape of the emitter source is Fireworksemitter.emittershape = Kcaemitterlayerline;
 The rendering mode Fireworksemitter.rendermode = Kcaemitterlayeradditive of the emitter source;

 The seed Fireworksemitter.seed = (Arc4random ()%100) +1, which is generated by the initialization random number of the transmitting source;
 /** * Add the launch point a circle (launch point) from the bottom of a process to launch to the above/caemittercell* rocket = [Caemittercell Emittercell]; Rocket.birthrate = 1.0; is the number of Effectcell produced at some point per second rocket.emissionrange = 0.25 * M_PI; Ambient firing angle rocket.velocity = 400; Speed Rocket.velocityrange = 100; Speed range rocket.yacceleration = 75;
 The acceleration component in the Y direction of the particleRocket.lifetime = 1.02;

 The life cycle of the Effectcell, how long it takes to display on the screen.
 The following is the content of the rocket, color, size setting rocket.contents = (ID) [[uiimage imagenamed:@ "Circle"] cgimage];
 Rocket.scale = 0.2;
 Rocket.color = [[Uicolor redcolor] cgcolor];
 Rocket.greenrange = 1.0;
 Rocket.redrange = 1.0;
 Rocket.bluerange = 1.0; Rocket.spinrange = M_PI;
 Sub rotation angle Range/** * Add the effect of explosion, suddenly the feeling of a big bit/caemittercell* burst = [Caemittercell Emittercell];
 Burst.birthrate = 1.0;
 burst.velocity = 0;
 Burst.scale = 2.5;
 Burst.redspeed =-1.5;
 Burst.bluespeed =+1.5;
 Burst.greenspeed =+1.0;

 Burst.lifetime = 0.35;
 /** * Add star diffusion particle/caemittercell* spark = [Caemittercell Emittercell];
 Spark.birthrate = 400;
 Spark.velocity = 125;
 Spark.emissionrange = 2* M_pi; Spark.yacceleration = 75;

 The acceleration component of the Y-direction of the particle spark.lifetime = 3;
 Spark.contents = (ID) [[uiimage imagenamed:@ ' star '] cgimage];
 Spark.scalespeed =-0.2;
 Spark.greenspeed =-0.1;
 Spark.redspeed = 0.4;
 Spark.bluespeed =-0.1; Spark.alphaspeed =-0.25; Examples of changes in transparencySpeed Spark.spin = 2* m_pi;

 Sub rotation angle Spark.spinrange = 2* m_pi;
 Combine caemitterlayer and Caemittercell fireworksemitter.emittercells = [Nsarray arraywithobject:rocket];
 Adding explosive particles on the basis of circle particles rocket.emittercells = [Nsarray Arraywithobject:burst];
 Adding star particles burst.emittercells = [Nsarray Arraywithobject:spark] on the basis of exploding particles;

Add to layer [Self.view.layer addsublayer:fireworksemitter];

 }

Caemitterlayer

Caemitterlayer is a particle engine provided by quartzcore that can be used to make beautiful particle effects. In fact, it can be said that it is loaded Caemittercell container, there is a property emittercells, the Caemittercell directly added to the array, you can achieve the particle effect.

Might use a property
* birthrate: Particle generation coefficient, default 1.0;
* Emittercells: An array of Caemittercell objects that are used to put the particles on the layer;
* Emitterdepth: Determining the depth of particle shape contact: emittershape
* Emittermode: Launch mode
* Emitterposition: Launch location
* Emittershape: The shape of the transmitting source;
* Emittersize: The size of the launch source is large;
* Emitterzposition: The z-coordinate position of the emitter source;
* Lifetime: Particle life cycle
* Preservesdepth: Not much clearer (particles are flattened on layers)
* Rendermode: Render mode:
* Scale: the scaling ratio of particles:
* Seed: Used to initialize the seed produced by random numbers
* Spin: self-rotating speed
* Velocity: particle velocity

Caemittercell

Caemittercell is used to represent a particle, and it has a series of parameters for setting the effect.

Properties that may be used
* birthrate This must be set, the specific meaning is the number of Effectcell per second.
* Alpharange: The range by which the color alpha of a particle can change;
* Alphaspeed: The speed at which particle transparency changes during the life cycle;
* Bluerange: The color of a particle blue can change the range;
* Bluespeed: The speed at which particle blue changes in the life cycle;
* Color: The colour of the particle
* Contents: is a Cgimageref object, both particles to show the picture;
* Contentsrect: The son rectangle should be painted in contents:
* Emissionlatitude: Angle of the direction of the z-axis of the launch
* Emissionlongitude:x-y plane of the launch direction
* Emissionrange; angle of firing around
* Emittercells: particle emitted by particles
* Enabled: Whether the particle is rendered
* Greenrange: The color of a particle green can change the range;
* Greenspeed: Change the speed of particle green in the life cycle;
* Lifetime: Life cycle
* Lifetimerange: Life cycle scope
* Magnificationfilter: Not very clear as if to increase their size
* Minificatonfilter: Reduce your size
* Minificationfilterbias: Factor to reduce size
* Name: The name of the particle
* Redrange: The color of a particle red can change the range;
* REDSPEED; The rate at which the particle red changes in the life cycle;
* Scale: Zoom ratio:
* Scalerange: Scaling scale range;
* Scalespeed: Zoom rate:
* Spin: Sub rotation angle
* Spinrange: Sub rotation angle Range
* Style: Not very clear:
* Velocity: Speed
* Velocityrange: Speed range
* Xacceleration: The acceleration component in the particle x direction
* Yacceleration: The acceleration component in the Y direction of the particle
* Zacceleration: The acceleration component in the z direction of the particle

The feeling caemitterlayer is a very interesting dongdong, at present first the basic knowledge point notes here, still needs the unceasing actual combat experience to be able to use it better.
Note reference: http://www.jb51.net/article/93043.htm

Text/Sky Ball (Jane book author)
Original link: http://www.jianshu.com/p/08cbe521afe5
Copyright belongs to the author, reprint please contact the author to obtain authorization, and labeled "Jane Book author".