Cocos2dx_可擦除Layer

概述#ifndef __ERASABLELAYER_H__#define __ERASABLELAYER_H__#include "cocos2d.h"USING_NS_CC;// http://blog.csdn.net/linchaolong// 可擦除的Layerclass ErasableLayer :public Layer{public: // 创建Erasable

#ifndef __ERASABLELAYER_H__#define __ERASABLELAYER_H__#include "cocos2d.h"USING_NS_CC;// http://blog.csdn.net/linchaolong// 可擦除的Layerclass ErasableLayer :public Layer{public:	// 创建ErasableLayer	//1.遮罩层	//2.橡皮擦（可以是Sprite或者纹理的路径）	static ErasableLayer* create(const char* layerPath,const char* erasaPath);	static ErasableLayer* create(Node *layer,Sprite* erasa);	static ErasableLayer* create(Node *layer,const char* erasaPath);	static ErasableLayer* create(const char* layerPath,Sprite* erasa);	// 还原	voID clear();	// 是否可擦除	voID seterasable(bool);	bool ontouchBegan(touch* touch,Event  *event);	voID ontouchesMoved(touch* touch,Event *event);	voID ontouchended(touch* touch,Event  *event);protected:	ErasableLayer();	~ErasableLayer();	bool init(Node *layer,Sprite* erasa);	voID tick(float);private:	Node* layer_;	Sprite* erasa_;	bool isErasable_;	RenderTexture* rt_;};#endif

#include "ErasableLayer.h"ErasableLayer::ErasableLayer() :isErasable_(true){}ErasableLayer::~ErasableLayer(){	CC_SAFE_RELEASE(layer_);	CC_SAFE_RELEASE(erasa_);} ErasableLayer* ErasableLayer::create(const char* layerPath,const char* erasaPath){	CCSprite* layer = CCSprite::create(layerPath);	CCSprite* erasa = CCSprite::create(erasaPath);	ErasableLayer* ret = new ErasableLayer;	if (ret->init(layer,erasa))	{		ret->autorelease();		return ret;	}	delete ret;	return nullptr;}ErasableLayer* ErasableLayer::create(Node* layer,Sprite* erasa){	ErasableLayer* ret = new ErasableLayer;	if (ret->init(layer,const char* erasaPath){	CCSprite* erasa = CCSprite::create(erasaPath);	ErasableLayer* ret = new ErasableLayer;	if (ret->init(layer,erasa))	{		ret->autorelease();		return ret;	}	delete ret;	return nullptr;}ErasableLayer* ErasableLayer::create(const char* layerPath,Sprite* erasa){	CCSprite* layer = CCSprite::create(layerPath);	ErasableLayer* ret = new ErasableLayer;	if (ret->init(layer,erasa))	{		ret->autorelease();		return ret;	}	delete ret;	return nullptr;}bool ErasableLayer::init(Node *layer,Sprite* erasa){	if (!Layer::init())	{		return false;	}	layer_ = layer;	erasa_ = erasa;	layer_->retain();	erasa_->retain();	this->setContentSize(layer_->getContentSize());	// 设置颜色混合模式	BlendFunc erasaBf = { GL_ZERO,GL_ONE_MINUS_SRC_Alpha }; //源因子：值为0，橡皮擦颜色为透明；目标因子：目标颜色透明度减去源颜色的透明度	erasa_->setBlendFunc(erasaBf);	auto size = layer_->getContentSize();	rt_ = RenderTexture::create(size.wIDth,size.height);	rt_->setAnchorPoint(Vec2(0,0));	rt_->setposition(Vec2(size.wIDth/2,size.height/2));	this->addChild(rt_);	clear();	schedule(CC_SCHEDulE_SELECTOR(ErasableLayer::tick));	// 触摸事件	auto Listener = EventListenertouchOneByOne::create();	Listener->ontouchBegan = CC_CALLBACK_2(ErasableLayer::ontouchBegan,this);	Listener->ontouchmoved = CC_CALLBACK_2(ErasableLayer::ontouchesMoved,this);	Listener->ontouchended = CC_CALLBACK_2(ErasableLayer::ontouchended,this);	_eventdispatcher->addEventListenerWithSceneGraPHPriority(Listener,this);	Listener->setSwallowtouches(false);	return true;}voID ErasableLayer::tick(float){	if (!isErasable_)	{		return;	}		// 设置源颜色Alpha值为最大值，目标颜色Alpha值减去源颜色Alpha值后就为0了，混合出来的效果就变透明了，这样就实现了橡皮擦效果了。	erasa_->setopacity(255);	// 更新RenderTexture	rt_->begin();		// 绘制	erasa_->visit();	rt_->end();}voID ErasableLayer::clear(){	layer_->setAnchorPoint(Vec2(0,0));	layer_->setposition(Vec2(0,0));	rt_->begin();	layer_->visit();	rt_->end();}voID ErasableLayer::seterasable(bool flag){	isErasable_ = flag;}bool ErasableLayer::ontouchBegan(touch* touch,Event  *event){	erasa_->setposition(this->convertToNodeSpace(touch->getLocation()));	return true;}voID ErasableLayer::ontouchesMoved(touch* touch,Event  *event){	erasa_->setposition(this->convertToNodeSpace(touch->getLocation()));}voID ErasableLayer::ontouchended(touch* touch,Event  *event){	erasa_->setposition(this->convertToNodeSpace(touch->getLocation()));}

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