2. Hello World!
#include "AppDelegate.h"
#include "HelloWorldScene.h"
USING_NS_CC;
AppDelegate::AppDelegate() {
}
AppDelegate::~AppDelegate()
{
}
bool AppDelegate::applicationDidFinishLaunching() {
// initialize director
CCDirector* pDirector = CCDirector::sharedDirector();
CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();
pDirector->setOpenGLView(pEGLView);
// turn on display FPS
pDirector->setDisplayStats(true);
// set FPS. the default value is 1.0/60 if you don't call this
pDirector->setAnimationInterval(1.0 / 60);
// create a scene. it's an autorelease object
CCScene *pScene = HelloWorld::scene();
// run
pDirector->runWithScene(pScene);
return true;
}
// This function will be called when the app is inactive. When comes a phone call,it's be invoked too
void AppDelegate::applicationDidEnterBackground() {
CCDirector::sharedDirector()->stopAnimation();
// if you use SimpleAudioEngine, it must be pause
// SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();
}
// this function will be called when the app is active again
void AppDelegate::applicationWillEnterForeground() {
CCDirector::sharedDirector()->startAnimation();
// if you use SimpleAudioEngine, it must resume here
// SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();
}
Red Color Stroke -> CCScene
Green Color Stroke -> CCLayer
Blue Color Stroke -> CCSprite
you can add many CCLayer in CCScene 1 for background ,1 for HUD etc… etc..
Line 28 get Pointer of HelloWorld scene function which is returning a CCScene
Line 31 using our SharedDirector run the HelloWorld::scene()
Line 38 CCDirector::sharedDirector()->stopAnimation(); //Stop the animation when game pause
Line 46 CCDirector::sharedDirector()->startAnimation(); // Run it again when game resumes
_________________________________________________________________
The HelloWorldScene class is sub class of CCLayer
Before we move to code let me explain some Data types
CCSize -> holds two floating point Numbers think it as width and height
CCPoint -> holds two floating point Numbers think it as x and y
ccp -> use it to set CCPoint values // ccp(0,0);
Delete the content of HelloWorldScene to this code according to me by default the code is not easy to understand as a complete beginner
#include "HelloWorldScene.h"
USING_NS_CC;
CCScene* HelloWorld::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();
// 'layer' is an autorelease object
HelloWorld *layer = HelloWorld::create();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
return false;
}
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
// add "HelloWorld" splash screen"
CCSprite* pSprite = CCSprite::create("HelloWorld.png");
// position the sprite on the center of the screen
pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
// add the sprite as a child to this layer
this->addChild(pSprite, 0);
return true;
}
Line 3 defined as using namespace cocos2d (Short keyword)
Line 5-18 static scene function which is returning pointer of cocos2d::CCScene*
Line 8 create new CCScene by CCScene::create();
Line 11 create new HelloWorld Layer by HelloWorld::create();
Line 14 add the HelloWorld Layer as child to CCScene by scene->addChild(layer); //the add child method is gonna used many times when you add sprite ,CCrenderTexture etc. etc.
Line 17 reutnr that CCScene which added HelloWorld layer to the scene
Line 21-77 initialize function named init() return boolean value it’s a Virtual function
Line 25-28 CCLayer::init() call init method of CCLayer if it’s false then return false exit method
Line 30 get Visible size of OpenGL View in CCSize data type CCSize holds two float values like width & height
Line 31 get Visible origin point of OpenGL View in CCPoint data type CCPoint holds two float values like x & y
Line 34 create a new Sprite with the file name which is in Resources folder
Line 37 set Position of the Sprite which is made in 34 by create a new CCPoint using ccp the Position will be center
Line 40 add the sprite as a child of Layer the second parameter is z-index (Hope you knwo what it is if you don’t then no worries it’s like the layer index which will be on top of that layer
just like we do in photoshop or illustrator we drag and drop the layer to the top of it if you set z-index 0 it will top on -1 if you set it 1 then it will be top on 0 Simple)
_______________________________________
This is the end of Hello World Tutorial hope you liked it if you did not then please post in comments what you did not like and what i can improve
we will go more advance step by step
Here is the Project Hello Classes just replace them with the project you created in Classes folder (I have not uploaded the full project because it will let you do some work of creating your own project OR saving my time for 9 MB project uplaod :D)
https://www.dropbox.com/s/gu64thsadl32wqf/Classes.rar
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