本文没你想象的那么,,复杂。事实上就是通过重力感应控制个小球移动而已。
先看头文件:
- #ifndef __HELLOWORLD_SCENE_H__
- #define __HELLOWORLD_SCENE_H__
- #include "cocos2d.h"
- USING_NS_CC;
- class HelloWorld : public cocos2d::CCLayer
- {
- public:
- HelloWorld(void);
- ~HelloWorld(void);
- // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
- virtual bool init();
- // there's no 'id' in cpp, so we recommand to return the exactly class pointer
- static cocos2d::CCScene* scene();
- // a selector callback
- void menuCloseCallback(CCObject* pSender);
- virtual void didAccelerate(CCAcceleration* pAccelerationValue);
- // implement the "static node()" method manually
- CREATE_FUNC(HelloWorld);
- protected:
- CCSprite* m_pBall;
- double m_fLastTime;
- };
- #endif // __HELLOWORLD_SCENE_H__
- #include "HelloWorldScene.h"
- using namespace cocos2d;
- #define FIX_POS(_pos, _min, _max)
- if (_pos < _min)
- _pos = _min;
- else if (_pos > _max)
- _pos = _max;
- HelloWorld::HelloWorld()
- : m_fLastTime(0.0)
- {
- }
- HelloWorld::~HelloWorld()
- {
- m_pBall->release();
- }
- CCScene* HelloWorld::scene()
- {
- CCScene * scene = NULL;
- do
- {
- // 'scene' is an autorelease object
- scene = CCScene::create();
- CC_BREAK_IF(! scene);
- // 'layer' is an autorelease object
- HelloWorld *layer = HelloWorld::create();
- CC_BREAK_IF(! layer);
- // add layer as a child to scene
- scene->addChild(layer);
- } while (0);
- // return the scene
- return scene;
- }
- // on "init" you need to initialize your instance
- bool HelloWorld::init()
- {
- bool bRet = false;
- do
- {
- CC_BREAK_IF(! CCLayer::init());
- CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
- "CloseNormal.png",
- "CloseSelected.png",
- this,
- menu_selector(HelloWorld::menuCloseCallback));
- CC_BREAK_IF(! pCloseItem);
- // Place the menu item bottom-right conner.
- pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20));
- // Create a menu with the "close" menu item, it's an auto release object.
- CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
- pMenu->setPosition(CCPointZero);
- CC_BREAK_IF(! pMenu);
- // Add the menu to HelloWorld layer as a child layer.
- this->addChild(pMenu, 1);
- //add Accelerometer
- CSize size = CCDirector::sharedDirector()->getWinSize();
- setAccelerometerEnabled(true);//打开重力感应
- m_pBall = CCSprite::create("ball.png");
- m_pBall->setPosition(ccp(size.width/2, size.height/2));
- addChild(m_pBall);
- m_pBall->retain();
- bRet = true;
- } while (0);
- return bRet;
- }
- <pre name="code" class="cpp">void HelloWorld::menuCloseCallback(CCObject* pSender)
- {
- // "close" menu item clicked
- CCDirector::sharedDirector()->end();
- }
- void HelloWorld::didAccelerate(CCAcceleration* pAccelerationValue)
- {
- // double fNow = pAccelerationValue->timestamp;
- //
- // if (m_fLastTime > 0.0)
- // {
- // CCPoint ptNow = convertToUI
- // }
- //
- // m_fLastTime = fNow;
- CCSize size = CCDirector::sharedDirector()->getWinSize();
- CCDirector* pDir = CCDirector::sharedDirector();
- /*FIXME: Testing on the Nexus S sometimes m_pBall is NULL */
- if ( m_pBall == NULL ) {
- return;
- }
- CCSize ballSize = m_pBall->getContentSize();
- CCPoint ptNow = m_pBall->getPosition();
- CCPoint ptTemp = pDir->convertToUI(ptNow);
- //9.8 重力加速度
- ptTemp.x += pAccelerationValue->x * 9.81f;
- ptTemp.y -= pAccelerationValue->y * 9.81f;
- CCPoint ptNext = pDir->convertToGL(ptTemp);
- FIX_POS(ptNext.x, (0+ballSize.width / 2.0), (size.width - ballSize.width / 2.0));
- FIX_POS(ptNext.y, (0+ballSize.height / 2.0), (size.height - ballSize.height / 2.0));
- m_pBall->setPosition(ptNext);
- }</pre>
- <p></p>
- <pre></pre>