cocos2dx 2.x实现闪电效果(贴画版)

 

cocos2dx 2.x实现闪电效果(非画线版)

在网上搜索到一个直接用opengl画线实现的版本，但放在游戏中效果不太搭，要求用贴图的。我这个版本用的也是画线版的算法。

闪动的时候效果还可以，每段衔接的地方还是不太完美，各位有其他的建议的请联系我  [email protected]

 

转载请注明出处 http://www.cnblogs.com/mrblue/p/4315091.html

 

效果图

//头文件

#ifndef __LIGINTNING_H__

#define __LIGINTNING_H__



#include "cocos2d.h"

#include <vector>



class Lightning : public cocos2d::CCNode

{

public:

	Lightning();

	~Lightning();



public:

    static Lightning* create(const std::string& strTextureFile, float fLength);

	virtual bool init(const std::string& strTextureFile, float fLength);



protected:

	virtual void draw()/*override*/;

	virtual void update(float fDelta)/*override*/;



public:

	void setTexture(cocos2d::CCTexture2D *texture);

	void setLength(float fLength){ m_fLength = fLength; }



protected:

	void calculateVertex();

	void addLightningSegment(float x1, float y1, float x2, float y2, float displace);



protected:

	std::vector<cocos2d::CCPoint>	m_vecLightningTrackPoint;

	std::vector<float>				m_vecVertics;

	std::vector<float>				m_vecCoordinates;

	cocos2d::CCTexture2D*			m_pTexture;

	float							m_fLength;

};



#endif // __HELLOWORLD_SCENE_H__

　　

//cpp

#include "Lightning.h"



USING_NS_CC;



using namespace std;





Lightning::Lightning()

    :m_pTexture(NULL)

{

    m_vecLightningTrackPoint.reserve(64);

    m_vecVertics.reserve(256);

    m_vecCoordinates.reserve(256);

}



Lightning::~Lightning()

{

    CC_SAFE_RELEASE(m_pTexture);

}



Lightning* Lightning::create( const std::string& strTextureFile, float fLength )

{

    Lightning * pRet = new Lightning();

    if (pRet && pRet->init(strTextureFile,fLength))

    {

        pRet->autorelease();

    }

    else

    {

        CC_SAFE_DELETE(pRet);

    }



    return pRet;

}



bool Lightning::init(const string& strFile, float fLength)

{

    CCNode::init();



    setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTexture));

    setLength(fLength);

    setTexture(CCTextureCache::sharedTextureCache()->addImage(strFile.c_str()));

    

    

    scheduleUpdate();

        

    return true;

}



void Lightning::draw()

{

    if(m_vecVertics.empty()||m_vecCoordinates.empty()) return;



    CC_NODE_DRAW_SETUP();

    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_TexCoords );

        

    ccGLBlendFunc( CC_BLEND_SRC,CC_BLEND_DST );

    ccGLBindTexture2D( m_pTexture->getName() );



    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)(&m_vecVertics[0]));

    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)(&m_vecCoordinates[0]));



    glDrawArrays(GL_TRIANGLE_STRIP, 0, m_vecVertics.size()/2);

}



void Lightning::addLightningSegment( float x1, float y1, float x2, float y2, float displace )

{

    if (displace <=m_pTexture->getPixelsWide()/2 )

    {

        m_vecLightningTrackPoint.push_back(ccp(x2,y2));

    }

    else

    {

        float mid_x = (x2+x1)/2;

        float mid_y = (y2+y1)/2;

        mid_x += (CCRANDOM_0_1() - 0.5) * displace;

        mid_y += (CCRANDOM_0_1() - 0.5) * displace;

        addLightningSegment(x1, y1, mid_x, mid_y, displace/2);

        addLightningSegment(mid_x, mid_y,x2, y2, displace/2);

    }

}



void Lightning::update(float delta)

{

    calculateVertex();

}



void Lightning::calculateVertex()

{

    m_vecLightningTrackPoint.clear();

    m_vecLightningTrackPoint.push_back(CCPointZero);

    addLightningSegment(0,0,m_fLength,0,m_fLength/3);



    m_vecVertics.clear();

    m_vecCoordinates.clear();



    for (size_t i=0; i<m_vecLightningTrackPoint.size(); i++)

    {

        const auto& pt = m_vecLightningTrackPoint[i];



        m_vecVertics.push_back(pt.x);

        m_vecVertics.push_back(pt.y-m_pTexture->getPixelsHigh()/2);

        m_vecVertics.push_back(pt.x);

        m_vecVertics.push_back(pt.y+m_pTexture->getPixelsHigh()/2);



        m_vecCoordinates.push_back(i);

        m_vecCoordinates.push_back(0);

        m_vecCoordinates.push_back(i);

        m_vecCoordinates.push_back(1);

    }

}



void Lightning::setTexture( cocos2d::CCTexture2D *texture )

{

    CC_SAFE_RETAIN(texture);

    CC_SAFE_RELEASE(m_pTexture);

    m_pTexture = texture;

　　ccTexParams params = {GL_LINEAR,GL_LINEAR,GL_REPEAT,GL_REPEAT}; m_pTexture->setTexParameters(&params);

}

 

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