IAPDemo/Libraries/red_utils/Actions/RUEfxShake.cpp

#include "RUEfxShake.h"
#include "cocos2d.h"  
USING_NS_CC;

NS_RU_BEGIN
  
// not really useful, but I like clean default constructors  
RUEfxShake::RUEfxShake() : m_strength_x(0), m_strength_y(0)
{  
}

RUEfxShake::~RUEfxShake()
{
}
  
RUEfxShake* RUEfxShake::create(float d, float strength)
{  
    // call other construction method with twice the same strength  
    return createWithStrength(d, strength, strength);
}  
  
RUEfxShake *RUEfxShake::createWithStrength(float duration, float strength_x, float strength_y, int interval)
{  
    RUEfxShake *pRet = new RUEfxShake();
  
    if (pRet && pRet->initWithDuration(duration, strength_x, strength_y,interval))
    {  
        pRet->autorelease();  
    }  
    else  
    {  
        CC_SAFE_DELETE(pRet);  
    }  
  
  
    return pRet;  
}  
  
bool RUEfxShake::initWithDuration(float duration, float strength_x, float strength_y, int interval)
{  
    if (ActionInterval::initWithDuration(duration))  
    {  
        m_strength_x = strength_x;  
        m_strength_y = strength_y;  
        m_curFrameCount = 0;
        m_interval = interval;
        m_accelEnable = true;
        return true;  
    }  
  
    return false;  
}  
  
// Helper function. I included it here so that you can compile the whole file it returns a random value between min and max included  
static float fgRangeRand( float min, float max )  
{  
    float rnd = ((float)rand() / (float)RAND_MAX);  
    return rnd * (max - min) + min;  
}  
  
void RUEfxShake::update(float dt)
{
    if (m_curFrameCount % m_interval != 0)
    {
        m_curFrameCount++;
        return;
    }

    float scale = m_accelEnable ? dt : 1.0;
    float randx = fgRangeRand(-m_strength_x, m_strength_x ) * scale;
    float randy = fgRangeRand(-m_strength_y, m_strength_y ) * scale;

    // move the target to a shaked position
    if (_target)
        _target->setPosition(m_StartPosition + Vec2( randx, randy));
    
    m_curFrameCount++;
    
    
//    CCLOG("efx shake : %f %f  %d",randx,randy,m_curFrameCount);
}
  
void RUEfxShake::startWithTarget(Node *pTarget)
{  
    ActionInterval::startWithTarget( pTarget );  
  
    // save the initial position  
    m_StartPosition=pTarget->getPosition();  
}  
  
void RUEfxShake::stop()
{  
    // Action is done, reset clip position
    if (this->getTarget())
        this->getTarget()->setPosition(m_StartPosition);
  
    ActionInterval::stop();  
}

NS_RU_END