Cocos2D

Cocos2d

• Open Source 2D Game Framework

• Built upon the OpenGL API’s

• 2D Game, Graphic, Interactive Application Programs

• Sep. 2008 - 0.3.0 version released

• Used in thousands of apps

• Active developer community

Cocos2d

• Multi-platform game engine

• iOS, Mac OS X, Android ported

• Cocos2d-x multi-platform port written in C++

iOS game engines(non-commercial)

Sparrow(open source)

Galaxy(New BSDLicense)

oolong engine(MIT License)

Cocos2d(open source)

iOS game engines(commercial)

Unreal Dev Kit

SIO2

Game salad

Unity

And much more...

iOS game engines• http://maniacdev.com/2011/01/open-source-

and-commercial-ios-game-engine-listings-updated/

• http://maniacdev.com/2009/09/the-commercial-iphone-game-engine-comparison-3d-and-2d/

Cocos2d games

Tap Pet Hotel: #1 Free

Tap Zoo: #2 Free

Zombie Farm: #6 Free

iStunt 2: #6 Free

Trainyard: #2 Paid

ZombieSmash: #1 PaidAir Penguin: #1 Paid

Fishing Frenzy: #7 Paid

Cocos2d games

Cocos2d for Mac App

Cocos2d vs OpenGL

• You can make a high level game using openGL

• You will need an animation of sprits, menus for the game, actions for game objects, sound effects, and much more...

• Cocos2d supports a wrapper class of OpenGL

• Also sound control class, menu class, sprites...

Cocos2d

http://www.cocos2d-iphone.org/

Installation for iOS

Installation for iOS

Installation(super easy)

Cocos2d for Android

Sample Program

Many featured sample codes are provided

Cocos2D Package

Tutorial codes for beginners-easy to start

Tutorial

Demo

Cocos2D for iPhone

and More

Features• Scene Graph Structure

• Flow Control(Scene Management)

• Flow Control between Scenes

• Sprites and Sprite Sheets

• Easy and powerful way of Sprite Usage

• Action

• Supports many actions including move, rotate, scale, sequence, spawn,...

Features

• Effect

• Various 2D effect including wave, twirl, lens, liquid, ripple

• Tiled Maps, Transition, Menus, Text Rendering

• Physics Engine : Chipmunk, Box2d, Particle System

Features

• Basic Menu and Button

• Parallax scrolling

• Sound Controls, Particle System

• High Score server(Cocos live)

• Based on OpenGL ES 1.1 - for iOS

• Based on OpenGL 1.5 - for Mac

Scene Graph

• Hierarchy of every Cocos2d NODE that's currently active.

• Every node has exactly one parent node, except the scene itself, and can have any number of child nodes.

• General technique on high level graphics system or game programming

Scene GraphCCScene

CCLayer CCLayer CCLayer

CCSprite CCMenu CCSprite

Scene Graph Structure

• General data structure used in Vector based graphics editing application or games.

• Acrobat 3D, Java 3D, AutoCAD, VRML, Open Inventor,..

• Collection of nodes in a graph or tree structure

Object class in Java

• The Object class is the super class for all classes in Java

• Defines the basic states and behavior that all objects must have

• equals, getClass, toString, ...

CCNode in Cocos2d

• The CCNode class is the super class of all Cocos2d class

• Defines common attributes and methods that all Cocos2d object must have

CCNode Class

• Most important Cocos2D class, most object in Cocos2d inherits from CCNode

• CCScene, CCLayer, CCSprite, CCMenu classes are children of CCNode class

• Can include another CCNode object.

• Can schedule periodic callbacks

• Can run all actions

CCNode Class

• Attributes

• rotation, scaleX_, scaleY_,position, visible_, anchorPointInPixels_, anchorPoint_, isRelativeAnchorPoint_, contentSize_, transform_, inverse_, vertexZ_, camera_, grid, zOrder_, children_

CCNode: Attributes

rotation

posit

ion

anchorPoint

• If you want to draw a monster in your game scene• You will need an image( CCSprite )• And its position, size, rotation angle, anchor point, ...

CCDirector Class

• Cocos2D Class has name space starting with CCxxx.

• Director(CCDirector)

• Management object for game control thru scene

• OpenGL ES environment setting

• Running the game loop

CCScene Class

• Scene

• A game is composed of multiple screens

• Each scene compose each screen on game

• Scene is composed of multiple layers(hierarchical structure)

Scene & Director

CCDirector

CCScene CCScene CCScene..

..

CCScene ClassCCScene

CCLayer CCLayer

(game layer) (touch handling layer)

CCLayer Class

• One Game scene can contain many layers

• and each layer contains more than one sprite or menu

• Capture user interaction or accelerometer

• Layer consists a scene

CCLayerScore: 210 LIFE : 3

CCLayer

CCSprite CCLabel CCNode..

CCSprite CCSprite ..

..

CCLayerScore: 210 LIFE : 3

CCLayer

CCSprite CCLabel CCNode..

CCSprite CCSprite ..

..

• CCLayer can handle events

• isTouchEnabled_

• isAccelerometerEnabled_

• Game controller

• Manage game entities

CCLayer

Sprite Object

• Image files are loaded into OpenGL ES Textures in a format that the GPU can understand

• Sprites can move within a scene or a layer

• Sprites may be animated, by cycling through a number of different images

CCSprite

Texture-Sprite Sheet

Sprites

Action

• Control the movement, transition, and effects of Cocos2d objects.

• All CCNode objects are able to run actions.

• CCAnimate, CCJumpBy, CCRepeatForever, CCSequence, CCSpawn, CCMoveTo, CCFadeTo,...

CCNode: Actions• Modify node’s attributes by time

• position/rotation/scale/opacity/grid/...

• Interval actions and Instant actions

Running an Action

high level action description

Tools - TexturePacker

• Loading a sprite requires much system resources

• In a game scene many sprites are required

• each sprite contains many animation images

• packaging each image into a big sprite sheet

Sprite Images

...

MB_01.png MB_02.png MB_03.png MB_03.png

Making a big Sprite Sheet

Meta data

in your codeSprite Sheet file

Sprite file

Tools-Font Generator

• Many game developers want in-house bitmap font

• Game scene needs an special font effect and customized fonts

Font Generator

in your code

font file(testFont.png)

import meta-data(testFont.fnt)

Sound Editor• Sound Effect is very important in a game

Map Editor

Particle Editor

More game tools

http://www.learn-cocos2d.com/2011/06/complete-list-cocos2d-tools/

Game Tools

• Many 3rd party game tools for Cocos2d are available

• Enrich your game effect

• Minimize your programming efforts

• More efficient way of memory management

Cocos2d for Android

Download

• Unzip downloaded file

• “ZhouWeikuan-cocos2d-1d79d40” folder will be generated.

Android Code

http://dan.clarke.name/2011/04/how-to-make-a-simple-android-game-with-cocos2d/

iOS code

http://www.raywenderlich.com/352/how-to-make-a-simple-iphone-game-with-cocos2d-tutorial

Android

Android code

iOS

iOS code

Demo

Q & A