Node之间的关系：
场景AppDelegate.cpp又要由导演去调用然后进行表演：
// create a scene. it's an autorelease object
auto scene = HelloWorld::createScene(); // run
director->runWithScene(scene);
这里层里面的场景HelloWorldScene.cpp里面的内容：
#include "HelloWorldScene.h" USING_NS_CC; Scene* HelloWorld::createScene()
{
// 'scene' is an autorelease object
auto scene = Scene::create(); // 'layer' is an autorelease object
auto 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 ( !Layer::init() )
{
return false;
} Size visibleSize = Director::getInstance()->getVisibleSize();
Vec2 origin = Director::getInstance()->getVisibleOrigin(); /////////////////////////////
// 2. add a menu item with "X" image, which is clicked to quit the program
// you may modify it.
//每一个addChild会创建出一个添加的层
// add a "close" icon to exit the progress. it's an autorelease object
auto closeItem = MenuItemImage::create(
"CloseNormal.png",
"CloseSelected.png",
CC_CALLBACK_1(HelloWorld::menuCloseCallback, this)); closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/ ,
origin.y + closeItem->getContentSize().height/)); // create menu, it's an autorelease object
auto menu = Menu::create(closeItem, NULL);
menu->setPosition(Vec2::ZERO);
this->addChild(menu, ); /////////////////////////////
// 3. add your codes below... // add a label shows "Hello World"
// create and initialize a label auto label = Label::createWithTTF("Hello sunzhiyan", "fonts/arial.ttf", ); // position the label on the center of the screen
label->setPosition(Vec2(origin.x + visibleSize.width/,
origin.y + visibleSize.height - label->getContentSize().height)); // add the label as a child to this layer
this->addChild(label, ); auto label1= Label::createWithTTF("", "fonts/arial.ttf", ); // position the label on the center of the screen
label1->setPosition(Vec2(origin.x + visibleSize.width / ,
origin.y + visibleSize.height - label1->getContentSize().height)); // add the label as a child to this layer
this->addChild(label1, ); //创建一个精灵
auto sprite = Sprite::create("sun.jpg"); //设置精灵的显示位置
sprite->setPosition(Vec2(visibleSize.width/ + origin.x, visibleSize.height/ + origin.y)); // 将精灵添加到层里面
this->addChild(sprite, ); return true;
} void HelloWorld::menuCloseCallback(Ref* pSender)
{
Director::getInstance()->end(); #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit();
#endif
}