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Demo creating-physics-game.

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This document provides an overview of how to create a physics-based game in 1 hour using Cocos2D and Box2D. It outlines a 7 step process: 1) initialize the director and create the physics world, 2) add dynamic blocks, 3) handle touch events, 4) add graphics, 5) add particles for effects, 6) add sound, and 7) notes it is a sample and not production code. Cocos2D provides scene management, textures, audio and rendering while Box2D adds 2D physics simulation.

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COCOS2D + BOX2D Creating physics game in 1 hour
WHO IS ROD? ? Founder of Prop Group www.prop.gr ? Background in enterprise software, now iPhone+iPad games! ? 2D physics game, Payload in the AppStore
In Progress... www.cocos2dbook.com
SNOWBALLTOSS!
WHY COCOS2D ? Games are fun! Making a game does not have to be hard. ? Write less infrastructure code, spend more time on design and core gameplay ? OpenGL ES rendering and performance without having to learn OpenGL ES to get started ? It is free!
GETTING COCOS2D http://github.com/cocos2d/cocos2d-iphone
GETTING COCOS2D - PART 2 1. Clone the Git Repository 2. Install theTemplates
XCODETEMPLATES ? New Project -> Cocos2DTemplates
COCOS2D ? Objective-C framework for games ? Scene Management,Textures,Audio ? Everything but the kitchen sink (3D stuff)* ? OpenGL ES rendering and optimizations, Actions,Tile Maps, Parallax Scrolling, Scheduler, High Score service, ...
COCOS2D ESSENTIALS ? Your game is divided into scenes, scenes into layers ? Layers have what you care about, the Sprites ? Director is used to switch between scenes ? Everything uses the CC namespace, so layers are CCLayers, CCScenes, CCSprites ...
LAYERS AND SCENES CCSprite(s) Background CCLayer Gameplay Scene CCScene Gameplay CCLayer
LAYERS ANDTOUCH Accelerometer Gameplay Scene CCLayer CCScene CCLayer CCLayer Touch
MULTIPLE SCENES Gameplay Scene CCLayer CCScene CCLayer CCLayer Level Completed Scene CCLayer CCScene CCLayer CCLayer Director CCScene
COCOS2D ACTIONS ? Actions are an easy way to apply transitions, effects, and animations to your sprites ? MoveTo, MoveBy, ScaleBy, ScaleTo, FadeIn, FadeOut ... CCAction *moveAction = [CCMoveBy actionWithDuration:2.0f position:CGPointMake(50.0f,0.0f)]; [playerSprite runAction:moveAction]; 2 seconds
COCOS2D+BOX2D ESSENTIALS 2 ? Box2D is C++ ? 2D rigid physics simulation engine with continuous collision detection ? All your ?les that touch C++ or include it must be Objective-C++ (.mm) ? Tuned for 1 meter sized objects! ? Use a ?xed time step!
A GAME IN 7 STEPS ? Lets begin
STEP 1 ? Attach the director to the AppDelegate window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; [window setUserInteractionEnabled:YES];!// cocos2d will inherit these values [window setMultipleTouchEnabled:YES]; // cocos2d will inherit these values // create an openGL view inside a window [[CCDirector sharedDirector] attachInView:window];! [window makeKeyAndVisible];! ! ? Director Options
STEP 2 ? init() ? createPhysicsWorld ? debug draw ? ground body
INIT() -(id)init { ! if ((self=[super init])) { ! ! CGSize screenSize = [CCDirector sharedDirector].winSize; ! ! ! ! // enable touches ! ! self.isTouchEnabled = YES; ! ! // enable accelerometer ! ! self.isAccelerometerEnabled = YES; ! ! ! ! [self createPhysicsWorld]; ! ! ! ! [self addNewBodyWithCoords:ccp((screenSize.width/2)+80.0f, screenSize.height/2) ! ! ! ! ! withDimensions:ccp(1.0f,0.5f) ! ! ! ! ! ! andDensity:3.0f ! ! ! ! ! andWithSprite:ICE_BLOCK_FILENAME_1]; ! ! ! ! // Start the scheduler to call the tick function ! ! [self schedule: @selector(tick:)]; ! } ! return self; }
CREATEPHYSICSWORLD() // Define the gravity vector. ! b2Vec2 gravity; ! gravity.Set(0.0f, -10.0f); ! ! // Do we want to let bodies sleep? ! // This will speed up the physics simulation ! bool doSleep = true; ! ! // Construct a world object, which will hold and simulate the rigid bodies. ! world = new b2World(gravity, doSleep); ! ! world->SetContinuousPhysics(true); b2BodyDef groundBodyDef; ! groundBodyDef.position.Set(0, 0); // bottom-left corner ! ! // Call the body factory which allocates memory for the ground body ! // from a pool and creates the ground box shape (also from a pool). ! // The body is also added to the world. ! b2Body* groundBody = world->CreateBody(&groundBodyDef); b2PolygonShape groundBox;! ! ! ! // bottom ! groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(screenSize.width/PTM_RATIO,0)); ! groundBody->CreateFixture(&groundBox);
STEP 3 ? Create the dynamic blocks
CODE+DEMO Physics World + Dynamic Blocks
STEP 4 ? Touch Events
CODE+DEMO Touch Events Demo
STEP 5 ? Time to add graphics!
GRAPHICS DETAILS ? Background Layer ? Sprites for the static shapes ? Sprites for the snowballs ? Penguin animation ? Instructions Layer
STEP 6 Let it snow! - Fun with Particle Systems
STEP 7 Pump up the volume!
CLOSINGTHOUGHTS ? Sample Code != Production Code ? Cocos2d Website: http://www.cocos2d-iphone.org/ Look at the sample tests included with Cocos2D!
THANKYOU ? rod@prop.gr ? twitter.com/rodstrougo ? www.prop.gr ? www.cocos2dbook.com
EXTRAS ? SpriteSheets ? Creating Physics Models ? Collision detection ? Accelerometer Filters ? Multi-touch handling
HOW-TO PHYSICS MODELS ? VertexHelper & Mekanimo http://github.com/jfahrenkrug/VertexHelper http://www.mekanimo.net/ ? Ricardos LevelSVG http://www.sapusmedia.com/levelsvg/

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Demo creating-physics-game.