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OGDC 2014_Hands on experience with Cocos2dx in cross-platform with Farmery_Mr. Vu Ngoc Kien

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The document discusses developing the Farmery game using the cocos2d-x game engine. It describes how the game uses over 125 animations optimized through tools like Dragon Bone. It also covers how cocos2d-x allows for multi-screen support across different devices by adjusting screen sizes and resolutions. Finally, it provides steps for debugging cocos2d-x games on Android using Eclipse instead of Cygwin on Windows.

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Farmery development using cocos2d-x Vu Ngoc Kien - Game Studio North / VNG
Farmery Game
Farmery Game  Over 1M downloads on Google Play  Top 10 frees on Apple Store  Run well on low specs as Galaxy Y phone  Coming soon on WP
Cocos2d-x - Cross platform game engine
 2D Cross-Platform engine game  Open source  High performance  Using cocos2d-ios documents as APIs are similar  Many support tools Advantages
 Not easy  Many choices: C++, Lua, Java Script  Use C++ language  Require understandings of different platforms setup Approach Cocos2d-x
1. Animation in Farmery game 2. Multiscreen in Cocos2d-x 3. Debug Cocos2d-x on Android Farmery development using Cocos2d-x
 Over 125 animations in game  Optimize to save memory 1. Animation in Farmery
Frame-By-Frame Animation 64 pictures, 2MB
Tween Animation 5 pictures, 240 KB
Make Animations using Dragon Bone http://dragonbones.github.io
Artists produce objects parts
Assemble animations on Flash
Extract animation file using Dragon Bone
Result
 Using flash in animation  Import PSD Layer  Support pictures skewing Advantages
1. Animation in Farmery game 2. Multi screen in Cocos2d-x 3. Debug Cocos2d-x on Android Farmery development using Cocos2d-x
2. Multi screen in Cocos2d-x 480 x 320 2048 x 1536 1136 x 640 1080 x 1920
 DesignResolutionSize: standard screen size  CCEGLView::sharedOpenGLView()->setDesignResolutionSize (width, height, policy)  Policy: • Exact fit • Show all • No border • Fixed Height • Fixed Width Multiscreen in cocos2d-x
Picture looks stretched Exact fit
2 black edges on the screen Show all
No border
 contentScaleFactor = RH/DH, resource for screen suitably  contentScaleFactor = (RH/DH)/ (MIN(fScaleX, fScaleY) / MAX(fScaleX, fScaleY)). fScaleX = FW/ DW; float fScaleY = FH/DH. contentScaleFactor
Farmery displays well on different screen sizes
1. Animation in Farmery game 2. Multiscreen by Cocos2d-x 3. Debug Cocos2d-x on Android Farmery development using Cocos2d-x
Require Cygwin, NDK Setup NDK path Can’t debug native Build cocos2d-x on Android by Cygwin on Windows
Build cocos2d-x on Android by eclipse  Not require Cygwin  Can debug native
 Undefined Cygwin (properties -> C/C++ Build -> Environment) Edit Project Properties
 Use Android GCC tool chain (properties -> C/C++ Build -> Tool Chain Editor) Edit Project Properties
• Setting build command: ndk-build NDK_DEBUG=1 –j8 (properties -> C/C++ Build -> Builder Setting) Edit Project Properties
Link Classes folder (properties -> C/C++ General -> Paths and Symbols -> Source Location) Edit Project Properties
 Add module path $(call import-add-path,(LOCAL_PATH)/../../../../../) $(call import-add- path,(LOCAL_PATH)/../../../../../cocos2dx/platform/third_party/ android/prebuilt) $(call import-module,cocos2dx) Edit file Android.mk
Crash will show on LogCat
Use Breakpoint to debug
1. Make Animation with Flash and Dragon Bone 2. Multiscreen by Cocos2d-x 3. Debug cocos2d-x on Android by Eclipse Develop Farmery by Cocos2d-x
OGDC 2014_Hands on experience with Cocos2dx in cross-platform with Farmery_Mr. Vu Ngoc Kien
Farmery development using cocos2d-x Vu Ngoc Kien KienVN@vng.com.vn (Game Studio North /VNG)

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OGDC 2014_Hands on experience with Cocos2dx in cross-platform with Farmery_Mr. Vu Ngoc Kien