[cocos2dx动作]CCLabel类数字变化动作

// CCLabelChange.h

#ifndef __testLabelChange__CCLabelChange__
#define __testLabelChange__CCLabelChange__
#include "cocos2d.h"
USING_NS_CC;
class CCLabelChange : public CCActionInterval
{
public:
CCLabelChange();public:
/** creates the action */
static CCLabelChange* create(float duration, int fromNum, int toNum); /** initializes the action */
bool initWithDuration(float duration, int fromNum, int toNum); virtual CCObject* copyWithZone(CCZone* pZone);
virtual void startWithTarget(CCNode *pTarget);
virtual CCActionInterval* reverse(void);
virtual void update(float time);protected:
int m_nFromNum;
int m_nToNum;
};

#include "CCLabelChange.h"
CCLabelChange::CCLabelChange():
m_nFromNum(0),
m_nToNum(0)
{}
CCLabelChange* CCLabelChange::create(float duration, int fromNum, int toNum)
{
CCLabelChange *pRet = new CCLabelChange();
pRet->initWithDuration(duration, fromNum, toNum);
pRet->autorelease(); return pRet;
}
bool CCLabelChange::initWithDuration(float duration, int fromNum, int toNum)
{
if (CCActionInterval::initWithDuration(duration))
{
m_nFromNum = fromNum;
m_nToNum = toNum;
return true;
} return false;
}
CCObject* CCLabelChange::copyWithZone(CCZone *pZone)
{
CCZone* pNewZOne= NULL;
CCLabelChange* pCopy = NULL;
if(pZone && pZone->m_pCopyObject)
{
//in case of being called at sub class
pCopy = (CCLabelChange*)(pZone->m_pCopyObject);
}
else
{
pCopy = new CCLabelChange();
pZone = pNewZOne= new CCZone(pCopy);
} CCActionInterval::copyWithZone(pZone); pCopy->initWithDuration(m_fDuration, m_nFromNum, m_nToNum); CC_SAFE_DELETE(pNewZone);
return pCopy;
}
void CCLabelChange::startWithTarget(CCNode *pTarget)
{
CCActionInterval::startWithTarget(pTarget); CCLabelProtocol *pLabel = dynamic_cast<CCLabelProtocol*>(m_pTarget);
if (pLabel)
{
CCString *numStr = CCString::createWithFormat("%i", m_nFromNum);
pLabel->setString(numStr->getCString());
}
}
CCActionInterval* CCLabelChange::reverse(void)
{
return CCLabelChange::create(m_fDuration, m_nToNum, m_nFromNum);
}
void CCLabelChange::update(float t)
{
CCLabelProtocol *pLabel = dynamic_cast<CCLabelProtocol*>(m_pTarget);
if (pLabel)
{
int num = m_nFromNum + (m_nToNum - m_nFromNum) * t;
CCString *numStr = CCString::createWithFormat("%i", num);
pLabel->setString(numStr->getCString());
}
}

CCLabelTTF *label = CCLabelTTF::create("", "Arial", 30);

float duration = 5.0f;
int fromNum = 20; //开始数字
int tOnum= 1000; //结束数字

CCLabelChange *pChange = CCLabelChange::create(duration, fromNum, toNum);

label->runAction(pChange);