cocos2dx实现手动选取区域截图

概述使用的方法是：RenderTexture渲染纹理+对当前场景的层Layer施加位移（先改后还）。 全屏截图可以使用以前的方法 RenderTexture渲染纹理， 也可以使用cocos2d::utils::captureScreen方法来完成。 保存下截图文件的话，还是需要使用到RenderTexture的saveToFile方法。 （鄙人新手一枚，如有好的方法，或者认为我这样做存在问题的，请多多

使用的方法是：RenderTexture渲染纹理+对当前场景的层Layer施加位移（先改后还）。
全屏截图可以使用以前的方法 RenderTexture渲染纹理，
也可以使用cocos2d::utils::captureScreen方法来完成。
保存下截图文件的话，还是需要使用到RenderTexture的savetofile方法。
（鄙人新手一枚，如有好的方法，或者认为我这样做存在问题的，请多多指教，在此谢过了！）

代码如下：

Screen.h

#ifndef _SCREEN_H_#define _SCREEN_H_#include "cocos2d.h"USING_NS_CC;class ScreenScene :public Layer{public:    static Scene* createScene();    virtual bool init();    CREATE_FUNC(ScreenScene);    voID menuCloseCallback(Ref *pSender);    bool ontouchBegan(touch *touch,Event *event);    voID ontouchended(touch *touch,Event *event);    voID afterCaptured(bool success,std::string filename);    //屏幕截图    voID screenShoot(Size size);private:    //触摸起始点与结束点    Vec2 _startPos,_endPos;};#endif

Screen.cpp

#include "Screen.h"Scene* ScreenScene::createScene(){    auto scene = Scene::create();    auto layer = ScreenScene::create();    scene->addChild(layer,0,11);    return scene;}bool ScreenScene::init(){    if (!Layer::init())    {        return false;    }    //获取视图    auto visibleSize = Director::getInstance()->getVisibleSize();    //添加背景图片    auto bgSprite = Sprite::create("HelloWorld.png");    bgSprite->setScale(visibleSize.wIDth / bgSprite->getContentSize().wIDth,visibleSize.height / bgSprite->getContentSize().height);    bgSprite->setposition(visibleSize.wIDth / 2,visibleSize.height / 2);    this->addChild(bgSprite);    //添加关闭按钮    auto closeItem = MenuItemImage::create(        "Closenormal.png","CloseSelected.png",CC_CALLBACK_1(ScreenScene::menuCloseCallback,this));    closeItem->setposition(visibleSize.wIDth - closeItem->getContentSize().wIDth / 2,closeItem->getContentSize().height / 2);    // create menu,it's an autorelease object    auto menu = Menu::create(closeItem,nullptr);    menu->setposition(Vec2::ZERO);    this->addChild(menu,1);    auto touchListener = EventListenertouchOneByOne::create();    touchListener->ontouchBegan = CC_CALLBACK_2(ScreenScene::ontouchBegan,this);    touchListener->ontouchended = CC_CALLBACK_2(ScreenScene::ontouchended,this);    _eventdispatcher->addEventListenerWithSceneGraPHPriority(touchListener,this);    //this->setposition(-20,-20);    return true;}voID ScreenScene::menuCloseCallback(Ref *pSender){    _director->end();}bool ScreenScene::ontouchBegan(touch *touch,Event *event){    //获取起始点    auto nodeLocation = this->convertToNodeSpace(touch->getLocation());    _startPos = nodeLocation;    return true;}voID ScreenScene::ontouchended(touch *touch,Event *event){    auto visibleSize = _director->getVisibleSize();    auto origin = Director::getInstance()->getVisibleOrigin();    //获得结束点    _endPos = this->convertToNodeSpace(touch->getLocation());    //定义一个划取大小的渲染纹理    auto shootSize = Size(MIN(abs(_startPos.x - _endPos.x),visibleSize.wIDth),MIN(abs(_startPos.y - _endPos.y),visibleSize.height));    auto renderTexture = RenderTexture::create(shootSize.wIDth,shootSize.height);    //获取当前场景    auto currentScene = _director->getRunningScene();    //获取左下点    auto leftDownPoint = Vec2(MAX(MIN(_startPos.x,_endPos.x),0),MAX(MIN(_startPos.y,_endPos.y),0));    auto offset = Vec2(0,0) - leftDownPoint;    //位移    currentScene->getChildByTag(11)->setposition(offset);    renderTexture->beginWithClear(0.0f,0.0f,0.0f);    currentScene->visit();    renderTexture->end();    //还原    //这里不设置延迟的话，由于前后时间的问题，会导致截图出现大的偏差。    auto delay = DelayTime::create(0.001f);    auto callfunc = CallFunc::create([=]{        //不让其还原的时候闪烁一下        Director::getInstance()->pause();        currentScene->getChildByTag(11)->setposition(0,0);        Director::getInstance()->resume();    });    this->runAction(Sequence::create(delay,callfunc,nullptr));    //这个path是截图保存的路径。    auto path = fileUtils::getInstance()->getWritablePath();    renderTexture->savetofile("ScreenShoot5201314.png",Image::Format::PNG);    return;    //这个是截取全屏的，因为上面已经return了，所以不会执行到这    //可以把上面全部注释掉，就能够看到效果了。    utils::captureScreen(CC_CALLBACK_2(ScreenScene::afterCaptured,this),"newScreenShoot.png");    return;}//捕获之后voID ScreenScene::afterCaptured(bool success,std::string filename){    auto visibleSize = _director->getVisibleSize();    if (success)    {        //先在中间显示，然后慢慢淡出，移除。当然还是将截图保存下来了        auto shootSprite = Sprite::create(filename);        shootSprite->setScale(0.25);        shootSprite->setposition(visibleSize.wIDth / 2,visibleSize.height / 2);        this->addChild(shootSprite,1,1);        screenShoot(shootSprite->getContentSize());        auto delay = DelayTime::create(1.0f);        auto fadeOut = FadeOut::create(2.0f);        auto callFunc = CallFunc::create([=]{shootSprite->removeFromParent(); log("the sprite has removed from his parentNode!"); });        shootSprite->runAction(Sequence::create(delay,fadeOut,callFunc,nullptr));    }    else    {        log("capture screen Failed!");    }}voID ScreenScene::screenShoot(Size size){    auto visibleSize = _director->getVisibleSize();    auto renderTexture = RenderTexture::create(size.wIDth,size.height,Texture2D::PixelFormat::RGBA8888);    auto shootSprite = this->getChildByTag(1);    renderTexture->beginWithClear(0,0);    shootSprite->visit();    renderTexture->end();    //这个path是截图保存的路径。    auto path = fileUtils::getInstance()->getWritablePath();    renderTexture->savetofile("newScreenShoot.png",Image::Format::PNG);    return;}

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