标签：cocos2dx alt name ems position cpp form flip shared
我的环境是cocos2dx 2.x的版本
【CCRenderTexture】
CCRenderTexture这个动态纹理类，顾名思义就是可以动态创建纹理图片。
屏幕截图主要步骤：
> 开始截图：render->begin();
> 遍历场景：scene->visit();
> 结束截图：render->end();
> 保存截图：render->saveToFile(string& filename, Image::Format format);
其中Image::Format为图片格式，可以保存为PNG、或JPG两种格式。
即：Image::Format::PNG、Image::Format::JPG。
首先是截整个屏幕（CCDirector.cpp中）：
saveToDCIM函数，找个目录，然后找到一个没用过的名字开始saveScreenShot
1 void CCDirector::saveToDCIM() 2 { 3 char bufferName[256]; 4 5 for (int i = 0;i<999999;i++) 6 { 7 std:string filedir = ""; 8 #if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID 9 filedir = std::string(SDKInterface::getExternalStoragePath()) +"/Screenshots"; 10 #else 11 filedir = CCFileUtils::sharedFileUtils()->getWritablePath() +"/Screenshots"; 12 #endif 13 memset(bufferName,0,sizeof(bufferName)); 14 sprintf(bufferName,"/SCREENSHOT_%d.png",i); 15 std::string filename = filedir + std::string(bufferName); 16 if(!CCFileUtils::sharedFileUtils()->isFileExist(filename)) 17 { 18 CCLog("ScreenShoot"); 19 createDirectory(filedir.c_str()); 20 saveScreenshot(filename); 21 return; 22 } 23 } 24 }
这是实际干活的函数：
1 void CCDirector::saveScreenshot( const std::string& fileName) 2 { 3 CCScene* temp = CCDirector::sharedDirector()->getRunningScene(); 4 if (temp) 5 { 6 CCSize winSize = CCDirector::sharedDirector()->getWinSize(); 7 CCRenderTexture* rt = CCRenderTexture::create(winSize.width, winSize.height); 8 rt->begin(); 9 temp->visit(); 10 rt->end(); 11 rt->saveToFile(fileName.c_str()); 12 CCLog(fileName.c_str()); 13 } 14 }
然后是截取屏幕的某一个部分，cocos2dx 3.x的版本里可以直接用这个函数：
2.x版本的怎么办呢？用得到的全屏截图rt的一部分RECT创建Sprite，然后在visit该Sprite，获得第二张截图rt2（比较懒，肯定不是最好的方法，欢迎指点）：
1 void CCDirector::renderTexturePartImpl(int x, int y, int width, int height, const std::string& fileName) 2 { 3 CCScene* temp = CCDirector::sharedDirector()->getRunningScene(); 4 if (temp) 5 { 6 CCSize winSize = CCDirector::sharedDirector()->getWinSize(); 7 CCRenderTexture* rt = CCRenderTexture::create(winSize.width, winSize.height); 8 rt->beginWithClear(0,0,0,0,0); 9 temp->visit(); 10 rt->endToLua(); 11 12 CCRenderTexture* rt2 = CCRenderTexture::create(width, height); 13 CCSprite* spr = CCSprite::createWithTexture(rt->getSprite()->getTexture(), CCRect(x, y, width, height)); 14 spr->setAnchorPoint(CCPoint(0,0)); 15 spr->setPosition(CCPoint(0,0)); 16 spr->setFlipY(true); 17 rt2->beginWithClear(0,0,0,0,0); 18 spr->visit(); 19 rt2->endToLua(); 20 rt2->saveToFile(fileName.c_str()); 21 CCLog(fileName.c_str()); 22 } 23 }
标签：cocos2dx alt name ems position cpp form flip shared
原文地址：http://www.cnblogs.com/pandawuwyj/p/6387489.html
