cocos2d-x-3.16实现橡皮擦除遮挡层(类似刮刮乐效果)

概述经历几次修改，总算实现了感觉还行的效果。下面是我的实现代码，高手勿喷！！！！ 1. Erasure.hpp //// Tailor.hpp// Hello-mobile#ifndef Erasure_hpp#define Erasure_hpp#include <stdio.h>#include <cocos2d.h>USING_NS_CC;class Erasure : pu

经历几次修改，总算实现了感觉还行的效果。下面是我的实现代码，高手勿喷！！！！

1. Erasure.hpp

//// Tailor.hpp// Hello-mobile#ifndef Erasure_hpp#define Erasure_hpp#include <stdio.h>#include <cocos2d.h>USING_NS_CC;class Erasure : public Layer{public:    Erasure();    ~Erasure();    bool init();    static Scene *scene();    virtual bool ontouchBegan(touch *touch,Event *unused_event);    virtual voID ontouchmoved(touch *touch,Event *unused_event);    virtual voID ontouchended(touch *touch,Event *unused_event);    virtual voID ontouchCancelled(touch *touch,Event *unused_event);    CREATE_FUNC(Erasure);public:    voID initializeElement();    voID initializeDrawNode();private:    Sprite *m_pBottom;    Sprite *m_pImage;   // DrawNode *m_pDotNode;    RenderTexture *m_pRenderTexture;};#endif /* Tailor_hpp */

3.Erasure.cpp

//// Tailor.cpp// Hello-mobile#include "Erasure.hpp"Erasure::Erasure(){    m_pImage = NulL;    m_pBottom = NulL;}Erasure::~Erasure(){    m_pImage = NulL;    m_pBottom = NulL;}Scene *Erasure::scene(){    Erasure *pLayer = Erasure::create();    Scene *scene = Scene::create();    scene->addChild(pLayer);    return scene;}bool Erasure::init(){    if (!Layer::init())    {        return false;    }    initializeElement();    initializeDrawNode();    EventListenertouchOneByOne *Listener = EventListenertouchOneByOne::create();    Listener->ontouchBegan = CC_CALLBACK_2(Erasure::ontouchBegan,this);    Listener->ontouchmoved = CC_CALLBACK_2(Erasure::ontouchmoved,this);    Listener->ontouchended = CC_CALLBACK_2(Erasure::ontouchended,this);    Listener->ontouchCancelled = CC_CALLBACK_2(Erasure::ontouchCancelled,this);    _eventdispatcher->addEventListenerWithSceneGraPHPriority(Listener,this);    return true;}voID Erasure::initializeElement(){    Size winSize = Director::getInstance()->getWinSize();    m_pBottom = Sprite::create("white.jpeg");    m_pBottom->setposition(Vec2(winSize.wIDth/2,winSize.height/2));    m_pBottom->setScale(5.0f);    addChild(m_pBottom,0);    m_pImage = Sprite::create("image.jpg");    m_pImage->setScale(2.0f);    m_pImage->setAnchorPoint(Vec2(0.5f,0.5f));    m_pImage->setposition(Vec2(winSize.wIDth/2,winSize.height/2));// addChild(m_pImage); //注意这里不要把遮挡精灵加入父节点，当时在这个地方卡了很久，//实现不了效果}voID Erasure::initializeDrawNode(){    Size size = Director::getInstance()->getWinSize();    //m_pDotNode = DrawNode::create();    //m_pDotNode->retain();    //m_pDotNode->drawDot(Point(0,0),3.0f,color4F(255,255));    m_pRenderTexture = RenderTexture::create(size.wIDth,size.height);    m_pRenderTexture->setposition(Vec2(size.wIDth/2,size.height/2));    this->addChild(m_pRenderTexture);    //通过RenderTexture将m_pImage渲染到节点上    m_pRenderTexture->begin();    m_pImage->visit();    m_pRenderTexture->end();}bool Erasure::ontouchBegan(cocos2d::touch *touch,cocos2d::Event *unused_event){    return true;}voID Erasure::ontouchmoved(cocos2d::touch *touch,cocos2d::Event *unused_event){    Point pt = touch->getLocation();    float distance = pt.distance(m_ptDragStart);    if (m_pRenderTexture && m_pRenderTexture->isVisible())    {        if (distance > 1)        {            m_pRenderTexture->begin();            int d = (int)distance;            for (int i = 0; i < d; i++)            {                //橡皮擦                blendFunc.src = GL_ZERO;                //设置混合模式                BlendFunc blendFunc;                blendFunc.src = GL_ZERO;                blendFunc.dst = GL_ONE_MINUS_DST_Alpha;// m_pDotNode->setBlendFunc(blendFunc);                Sprite *brush = Sprite::create("brush.png");                brush->setBlendFunc(blendFunc);                float difx = pt.x - m_ptDragStart.x;                float dify = pt.y - m_ptDragStart.y;                float delta = (float)i / distance;                Point pos = Point(m_ptDragStart.x + (difx * delta),m_ptDragStart.y + (dify * delta));// m_pDotNode->setposition(pos);// m_pDotNode->visit();                brush->setposition(pos);                brush->visit();            }            m_pRenderTexture->end();        }    }    m_ptDragStart = touch->getLocation();}voID Erasure::ontouchended(cocos2d::touch *touch,cocos2d::Event *unused_event){}voID Erasure::ontouchCancelled(cocos2d::touch *touch,cocos2d::Event *unused_event){}

参考文章： 1.http://www.mamicode.com/info-detail-193798.html 总结

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