cocos2d-x 重力感应

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__

看.cpp

#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>

巴特西

cocos2d-x 重力感应

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