COCOS2D-X 抖动效果 CCShake

cocos2dx全屏抖动，个别对象抖动

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/**

desc:让指定控件抖动

一个CCNode同时执行多个CCShake动作,或者一个CCShake没有完又执行一个CCShake的话就会出现问题,会出现偏移的现象!

解决方案:

1).不要同时执行多个CCShake动作.

2.自己外部记录这个CCNode的位置,执行完成后手动setPosition();

*/

#ifndef __SHAKE_H__

#define __SHAKE_H__

#include "actions/CCActionInterval.h"

/**

* 按指定频度范围内抖动[-strength_x,strength_x][-strength_y, strength_y]

*/

class CCShake : public cocos2d::CCActionInterval

{

public:

CCShake();

// Create the action with a time and a strength (same in x and y)

static CCShake* create(float d, float strength );

// Create the action with a time and strengths (different in x and y)

static CCShake* createWithStrength(float d, float strength_x, float strength_y );

bool initWithDuration(float d, float strength_x, float strength_y );

protected:

virtual void startWithTarget(cocos2d::CCNode *pTarget);

virtual void update(float time);

virtual void stop(void);

// Initial position of the shaked node

float m_initial_x, m_initial_y;

// Strength of the action

float m_strength_x, m_strength_y;

};

/**

* 线性抖动(剩余时间越短，抖动范围越小)

*/

class CCFallOffShake : public CCShake

{

public:

CCFallOffShake();

// Create the action with a time and a strength (same in x and y)

static CCFallOffShake* create(float d, float strength );

// Create the action with a time and strengths (different in x and y)

static CCFallOffShake* createWithStrength(float d, float strength_x, float strength_y );

protected:

virtual void update(float time);

};

#endif //__SHAKE_H__

CPP

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#include "ShakeAction.h"

#include "cocos2d.h"

USING_NS_CC;

// not really useful, but I like clean default constructors

CCShake::CCShake() : m_strength_x(0), m_strength_y(0), m_initial_x(0), m_initial_y(0)

{

}

CCShake* CCShake::create( float d, float strength )

{

// call other construction method with twice the same strength

return createWithStrength( d, strength, strength );

}

CCShake* CCShake::createWithStrength(float duration, float strength_x, float strength_y)

{

CCShake *pRet = new CCShake();

if (pRet && pRet->initWithDuration(duration, strength_x, strength_y))

{

pRet->autorelease();

}

else

{

CC_SAFE_DELETE(pRet);

}

return pRet;

}

bool CCShake::initWithDuration(float duration, float strength_x, float strength_y)

{

if (CCActionInterval::initWithDuration(duration))

{

m_strength_x = strength_x;

m_strength_y = strength_y;

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 = CCRANDOM_0_1();

return rnd*(max-min)+min;

}

void CCShake::update(float dt)

{

float randx = fgRangeRand( -m_strength_x, m_strength_x )*dt;

float randy = fgRangeRand( -m_strength_y, m_strength_y )*dt;

// move the target to a shaked position

m_pTarget->setPosition( ccpAdd(ccp(m_initial_x, m_initial_y),ccp( randx, randy)));

}

void CCShake::startWithTarget(CCNode *pTarget)

{

CCActionInterval::startWithTarget( pTarget );

// save the initial position

m_initial_x = pTarget->getPosition().x;

m_initial_y = pTarget->getPosition().y;

}

void CCShake::stop(void)

{

// Action is done, reset clip position

this->getTarget()->setPosition( ccp( m_initial_x, m_initial_y ) );

CCActionInterval::stop();

}

///////////////////////////////////////////////////////////////////////////////

CCFallOffShake::CCFallOffShake()

{

}

// Create the action with a time and a strength (same in x and y)

CCFallOffShake* CCFallOffShake::create(float d, float strength )

{

return createWithStrength( d, strength, strength );

}

// Create the action with a time and strengths (different in x and y)

CCFallOffShake* CCFallOffShake::createWithStrength(float duration, float strength_x, float strength_y)

{

CCFallOffShake *pRet = new CCFallOffShake();

if (pRet && pRet->initWithDuration(duration, strength_x, strength_y))

{

pRet->autorelease();

}

else

{

CC_SAFE_DELETE(pRet);

}

return pRet;

}

void CCFallOffShake::update(float dt)

{

float rate = (getDuration() - getElapsed())/getDuration();

if (rate < 0.f) {

rate = 0.f;

}

float randx = fgRangeRand( -m_strength_x, m_strength_x )*rate;

float randy = fgRangeRand( -m_strength_y, m_strength_y )*rate;

// move the target to a shaked position

m_pTarget->setPosition( ccpAdd(ccp(m_initial_x, m_initial_y),ccp( randx, randy)));

}

用法:

pSprite->runAction(CCShake::create(0.1f,10));

pSprite:想抖动的物体

第一个参数是:抖动的时间

第一个参数是:抖动的幅度

注意

一个CCNode同时执行多个CCShake动作,或者一个CCShake没有完又执行一个CCShake的话就会出现问题,会出现偏移的现象!

解决方案:

1).不要同时执行多个CCShake动作.

2.自己外部记录这个CCNode的位置,执行完成后手动setPosition();