Post on 08-May-2015
description
Cocos2D Programming
Dong Gyu PARK ( dongupak@gmail.com )June. 2012.
Carnegie Mellon University - MSIT
Introduction
• DongGyu PARK(Dennis PARK)
• Associate Professor
• Changwon National University, S. KOREA
• Visiting Scholar at TAMU(2012. Feb-.)
• Visiting Researcher at CMU(2007-2008), Pittsburgh, PA
• Blog http://Cocos2dDev.com/ (Korean)
Agenda
• Portfolios
• Mobile Games
• Cocos2d Introduction
• Learning Cocos2d
• Cocos2d Tools
• Cocos2d on iOS vs Android
Portfolios
Shake Series
• Shaking App using accelerometer sensor
• 4 Players can play
• Fun Sounds
• Lightweight App
• Game Center available
• Cocos2d game development kit
Shake Series
Coke Shake
http://itunes.apple.com/us/app/coke-shake!/id448242537?mt=8
Action Game
Monster Buster
Monster Buster
http://itunes.apple.com/us/app/monster-buster/id440886409?l=ko&ls=1&mt=8
Pocket Windmill
http://itunes.apple.com/us/app/pocket-windmill/id439495371?l=ko&ls=1&mt=8
Mobile Games
Successful Mobile Game
Successful Mobile Game
• The game has to be easy to learn and understand
• people to not spend much time to learn mobile games
• Little input, Big output
• Simple but huge amount of feedbacks
• Physics based gameplay
• physics give much variations on same input
Successful Mobile Game
• A bright, fun, cartoony, and cute visual style
• Very simple storyline
• The player is constantly rewarded
• Huge amount of levels but very short to play
• Provides users ranking
AR Game : AR Defender
http://www.youtube.com/watch?v=rB5xUStsUs4&feature=player_embedded
AR defense - tracking by camera and marker
Look-up
http://www.youtube.com/watch?v=bps3FkX-_cY&feature=player_embedded
Team play is available
Cocos2D Introduction
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
• Started as a Python framework, re-written in Objective-C in 2008
• Cocos2d-x - multi-platform port written in C++
Trainyard: #2 Paid
ZombieSmash: #1 PaidAir Penguin: #1 Paid
Birzzle
Cocos2d games
Cocos2d vs OpenGL
• You can also make a high level game using openGL, but ...
• 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...
and CoreGraphics
• C-based API based on Quartz drawing engine
• low-level, lightweight 2D rendering
• path-based drawing, transformation, color management, offscreen rendering, patterns, image data management, image creation, masking
• low-level drawing apps
Cocos2d
http://www.cocos2d-iphone.org/
Installation for iOS
Installation for iOS
Installation(super easy)
Cocos2d for Android
http://code.google.com/p/cocos2d-android-1/
Sample Program
Many featured sample codes are provided
Cocos2D Package
Tutorial codes for beginners- easy to start
Tutorial
Demo
Cocos2D for iPhone
and More
Learning Cocos2d
Features
• Scene Graph Structure
• Flow Control(Scene Management)
• Flow Control between Scenes
• Sprites and Sprite Sheets
• Easy and powerful way of Sprite Usage
• Actions are most powerful features
• Supports many actions including move, rotate, scale, sequence, spawn, and manipulate objects with ease.
Features
• Various 2D effect including wave, twirl, lens, liquid, ripple
• Tiled Maps, Transition, Menus, Text Rendering
• Built-in Font Support
• Embedded TrueType fonts and bitmap font
• 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 Structure
• General data structure used in Vector based graphics editing application or games.
• Acrobat 3D, AutoCAD, VRML, Open Inventor, X3D, OpenSG,..
• Collection of nodes in a graph or tree structure
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
Principal Classes• Cocos2D Class has name space starting with
CC-.
• CCNode - main class
• CCDirector - controls scenes
• CCSprite - logic to hold and manipulate game image
• CCScene
• CCLayer
CCNode Class
• The CCNode class is the super class of all Cocos2d class
• Defines common attributes and methods that all Cocos2d object must have
• contains the logic to enable it to schedule events on itself as well as to perform Cocos2d actions
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_, ...
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, ...(Attributes)
CCNode : Attributes
CCDirector Class
• Similar to a director’s role in movies
• Management object for game control thru scene
• OpenGL ES environment setting
• Running the game loop
CCScene Class
• A game is composed of multiple screens
• Each scene compose each screen on game
• Scene is composed of multiple layers (hierarchical structure)
• Scene contains CCLayer and other graphical objects on screen
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 ..
.. remove child
• CCLayer can handle touch and accelerometer events
• all the sprites and game elements are contained within layers
• Game controller
• Manage game entities
CCLayer Class
Sprite Object
• Image files are loaded into OpenGL ES Textures in a format that the GPU can understand
• contains the necessary logic to hold and manipulate your image.
• 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,...
• Modify node’s attributes by time
• position/rotation/scale/opacity/grid/...
• Interval actions and Instant actions
• Actions that let you compose actions
• Sequence action, Spawn action, Repeat action, RepeatForever action
Action
Running an Action
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
Sprite frame from sprite cached sheet
Animation contain frames
Animate framesrepeats animation forever
in your code
Tutorial-Birds on Wire
http://itunes.apple.com/us/app/birds-on-a-wire/id474403193?mt=8
How to use
...
...
Cocos2d Tools
Tools-Font Generator
• Many game developers want in-house bitmap font
• Game scene needs an special font effect and customized fonts
Font Generator
http://www.bmglyph.com/http://www.71squared.com/
in your code
font file(testFont.png)
import meta-data(testFont.fnt)
Sound Editor• Sound Effect is very important in a game
Sound in your code• SimpleAudioEngine
object is a wrapper to the CDAudioManager object
• if you just want to play some sound fx without knowing lower level working, this is the interface to use
Particle Editor
http://particledesigner.71squared.com/
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 on iOS vs Android
Cocos2d-android
• based on cocos2d-iphone design
• uses same API, but instead of using objective-c, it uses Java
• comparing to iOS design, it goes slow updating(latest follow-up cocos2d-iphone version is 0.99.4-June, 2012)
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
Android iOS
Demo
Cocos2d-X
• Cocos2d-X is a port of Cocos2d engine using C++
• written in C++ and OpenGL ES 1.1/2.0
• run on iOS, Android, BlackBerry, Bada(Samsung phone), Marmalade, Windows, Linux and more
Cocos2d-html5• written in Javascript for
HTML5 compliant browser
• derived from Cocos2d-X
• Available Cocos2d game on your web browser
http://www.gamefromscratch.com/post/2012/06/03/Cocos2D-HTML-release-a-tech-demo-Moon-Warriors.aspx
Q & A
Contact
dongupak@gmail.comhttp://Cocos2dDev.com/