osg截取场景图片

osg截取场景图片

#include <osgViewer/Viewer>
#include <osgViewer/ViewerBase>
#include <osgViewer/GraphicsWindow>
#include <osg/Node>
#include <osg/Geode>
#include <osg/Group>
#include <osg/Camera>
#include <osg/Image>
#include <osg/BufferObject>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgUtil/Optimizer>
#include <iostream>
#include <osgGA/GUIEventHandler>
#include <osgGA/TrackballManipulator>
#include <osg/RenderInfo>
#include <OpenThreads/Mutex>
#include <OpenThreads/Thread>
#include <OpenThreads/ScopedLock>

osg::ref_ptr<osg::Image> image_c = new osg::Image();

struct CaptureCallback :public osg::Camera::DrawCallback
{
    CaptureCallback()
    {
        
        std::cout << "=----0---=" << std::endl;
    }

    CaptureCallback(osg::ref_ptr<osg::Image> image)
    {
        image_ = image;

        std::cout << "=-------=" << std::endl;
    }

    ~CaptureCallback() {}

    virtual void operator()(const osg::Camera &camera) const
    {
        //得到窗口系统接口
        //osg::ref_ptr<osg::GraphicsContext::WindowingSystemInterface> wsi = osg::GraphicsContext::getWindowingSystemInterface();
        unsigned int width=800, height=500;
        //得到分辨率
        //wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);

        //分配一个image
        image_->allocateImage(width, height, 1, GL_RGB, GL_UNSIGNED_BYTE);
        //读取像素信息抓图
        image_->readPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE);
    }


    //virtual void operator()(osg::RenderInfo& renderInfo) const
    //{
    //    //读取像素信息抓图
    //    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);
    //    auto& camera = *renderInfo.getCurrentCamera();
    //    auto traits = camera.getGraphicsContext()->getTraits();
    //    glReadBuffer(traits->doubleBuffer ? GL_BACK : GL_FRONT);
    //    _image->readPixels(pos[0], pos[1], size[0], size[1], _image->getPixelFormat(), _image->getDataType());
    //}
    //osg::Vec2i pos;
    //osg::Vec2i size;
    //osg::observer_ptr<osg::Image> _image;
    //mutable OpenThreads::Mutex  _mutex;

private:
    osg::ref_ptr<osg::Image> image_;

};

//抓图事件处理器
class ImageHandler :public osgGA::GUIEventHandler
{
public:
    ImageHandler()
    {
        _screenCaptureSequence = 0;
    }
    ~ImageHandler() 
    {
    
    }

    bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
    {
        osg::ref_ptr<osgViewer::Viewer> viewer = dynamic_cast<osgViewer::Viewer *>(&aa);

        //std::cout << "======1======" << std::endl;
        if (viewer == NULL)
        {
            return false;
        }

        std::cout << "======2======" << ea.getEventType() << std::endl;
        
        if (ea.getEventType()==16)
        {
            char filename[128];
            sprintf(filename, "ScreenShot%4d.bmp", _screenCaptureSequence);
            std::cout << filename << std::endl;
            _screenCaptureSequence++;
            osgDB::writeImageFile(*(image_c.get()), filename);
        }

        switch (ea.getEventType())
        {
            case osgGA::GUIEventAdapter::KEYDOWN:
        {
            
        }
        break;
        default:

            return false;//一定设为false不然不能旋转
        }
        return true;
    }

private:
    //定义一个静态变量
    int _screenCaptureSequence;

};

int main()
{
    osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("L:\\BIM\\robot.osg");
    osg::ref_ptr<osg::Group> root = new osg::Group();
    root->addChild(node.get());
    osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();

    osgUtil::Optimizer optimizer;
    optimizer.optimize(root.get());




    //osg::Vec2i pos(400,250);
    //osg::Vec2i size(800,500);
    //osg::observer_ptr<osg::Image> _image = new osg::Image();
    ////mutable OpenThreads::Mutex  _mutex;

    //osg::ref_ptr<CaptureCallback> cb = new CaptureCallback();
    //cb->pos = pos;
    //cb->size = size;
    //cb->_image = _image;
    //viewer->getCamera()->setFinalDrawCallback(cb);
    //auto viewer2= dynamic_cast<osgViewer::ViewerBase*>(viewer->getCamera()->getView());
    //auto oldModel = viewer2->getThreadingModel();
    //viewer2->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
    //viewer2->renderingTraversals();
    //viewer2->setThreadingModel(oldModel);
    //viewer->getCamera()->setFinalDrawCallback(nullptr);



    viewer->getCamera()->setPostDrawCallback(new CaptureCallback(image_c.get()));
    viewer->addEventHandler(new ImageHandler());


    viewer->setSceneData(root.get());
    viewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
    
    viewer->setUpViewInWindow(200, 200, 800, 500, 0);
    

    viewer->realize();
    viewer->run();
    return 1;
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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