[cocos2dx动作]CCLabel类数字变化动作

cococs2dx的CCLabel类的数字变化动作

介绍: 简单的数字变化动作(适用于CCLabel类对象, 包括CCLabelTTF， CCLabelAtlas, CCLabelBMFont等等)

 

//注意 demo中支持的是CCLabelTTF ，把dynamic_cast相应的代码改成如下即可支持多种CCLabel对象

CCLabelProtocol *pLabel = dynamic_cast<CCLabelProtocol*>(m_pTarget); 

 

demo下载地址:http://pan.baidu.com/s/1c09r3jU 环境:cocos2dx 2.14, xcode 5.0.2

版权木有，欢迎转载与各种使用修改~

源代码:

//头文件 CCLabelChange.h

//  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;

};

//cpp文件 CCLabelChange.cpp

#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());

    }



}

//使用方法

        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);