Cocos2d-x3.1及3.2实现截屏功能

• 1、Cocos2d-x3.1

  在Cocos2d-x3.2之前，Cocos引擎没有提供截图功能，但是可以通过RenderTexture实现，
• 原文链接：http://www.it165.net/pro/html/201409/21451.html
  

  1.1首先在CCDirector.h中添加如下代码：并在其中添加头文件 #include "2d/CCRenderTexture.h"

  view sourceprint?

  1.void saveScreenshot(const std::string& fileName,const std::function<void(const std::string&)>& callback);

  1.2然后在CCDirector.cpp中添加如下代码：

  view sourceprint?

  01.void Director::saveScreenshot(const std::string &fileName, const std::function<void (const std::string &)> &callback)

  02.{

  03.Image::Format format;

  04.//进行后缀判断

  05.if(std::string::npos != fileName.find_last_of(".")){

  06.auto extension = fileName.substr(fileName.find_last_of("."),fileName.length());

  07.if (!extension.compare(".png")) {

  08.format = Image::Format::PNG;

  09.} else if(!extension.compare(".jpg")) {

  10.format = Image::Format::JPG;

  11.} else{

  12.log("cocos2d: the image can only be saved as JPG or PNG format");

  13.return;

  14.}

  15.} else {

  16.log("cocos2d: the image can only be saved as JPG or PNG format");

  17.return ;

  18.}

  19.//获取屏幕尺寸，初始化一个空的渲染纹理对象

  20.auto renderTexture = RenderTexture::create(getWinSize().width, getWinSize().height, Texture2D::PixelFormat::RGBA8888);

  21.//清空并开始获取

  22.renderTexture->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);

  23.//遍历场景节点对象，填充纹理到RenderTexture中

  24.getRunningScene()->visit();

  25.//结束获取

  26.renderTexture->end();

  27.//保存文件

  28.renderTexture->saveToFile(fileName , format);

  29.//使用schedule在下一帧中调用callback函数

  30.auto fullPath = FileUtils::getInstance()->getWritablePath() + fileName;

  31.auto scheduleCallback = [&,fullPath,callback](float dt){

  32.callback(fullPath);

  33.};

  34.auto _schedule = getRunningScene()->getScheduler();

  35._schedule->schedule(scheduleCallback, this, 0.0f,0,0.0f, false, "screenshot");

  36. 

  37.}

  1.3在HelloWorld.cpp中添加如下代码：

  view sourceprint?

  01.bool HelloWorld::init()

  02.{

  03.bool bRet = false;

  04.do{

  05.CC_BREAK_IF(!Layout::init());

  06.auto button = ui::Button::create("CloseNormal.png","CloseSelected.png");

  07.button->setPosition(Vec2(200,200));

  08.addChild(button);

  09.button->addTouchEventListener(CC_CALLBACK_2(HomeLayer::touchEvent,this));

  10.Director::getInstance()->getEventDispatcher();

  11. 

  12.bRet = true;

  13.}while(0);

  14.return bRet;

  15.}

  16. 

  17.void HelloWorld::touchEvent(cocos2d::Ref *pSender, cocos2d::ui::Widget::TouchEventType type)

  18.{

  19.switch (type)

  20.{

  21.case Widget::TouchEventType::ENDED:

  22.<span style="white-space:pre">    </span>    //参数依次为保存图片的名字，在控制台打印保存路径信息

  23.Director::getInstance()->saveScreenshot("homeLayer.png", [&](const std::string &str){

  24.log("str = %s",str.c_str());

  25.});

  26.break;

  27.default:

  28.break;

  29.}

  30.}

  1.4点击按钮，实现截图功能，最后图片保存在沙盒中，可在Xcode控制台下看到文件保存路径。

  2、Cocos2d-x3.2

  Cocos2d-x3.2中已经封装了截图共，使用如下
  view sourceprint?

  1.void Util::captureScreen(const std::function<void(bool, const std::string&)>& afterCaptured, const std::string& filename);
•