C++ GUIEventAdapter::getGraphicsContext方法代码示例

void CompositeViewer::reprojectPointerData(osgGA::GUIEventAdapter& source_event, osgGA::GUIEventAdapter& dest_event)
{
    osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(dest_event.getGraphicsContext());
    if (!gw) return;

    float x = dest_event.getX();
    float y = dest_event.getY();

    bool invert_y = dest_event.getMouseYOrientation()==osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS;
    if (invert_y && gw->getTraits()) y = gw->getTraits()->height - y;

    dest_event.addPointerData(new osgGA::PointerData(gw, x, 0, gw->getTraits()->width,
                              y, 0, gw->getTraits()->height));

    osg::Camera* camera = (source_event.getNumPointerData()>=2) ? dynamic_cast<osg::Camera*>(source_event.getPointerData(1)->object.get()) : 0;
    osg::Viewport* viewport = camera ? camera->getViewport() : 0;

    if (!viewport) return;

    dest_event.addPointerData(new osgGA::PointerData(camera, (x-viewport->x())/viewport->width()*2.0f-1.0f, -1.0, 1.0,
                              (y-viewport->y())/viewport->height()*2.0f-1.0f, -1.0, 1.0));

    osgViewer::View* view = dynamic_cast<osgViewer::View*>(camera->getView());
    osg::Camera* view_masterCamera = view ? view->getCamera() : 0;

    // if camera isn't the master it must be a slave and could need reprojecting.
    if (view && camera!=view_masterCamera)
    {
        generateSlavePointerData(camera, dest_event);
    }
}

void CompositeViewer::generatePointerData(osgGA::GUIEventAdapter& event)
{
    osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(event.getGraphicsContext());
    if (!gw) return;

    float x = event.getX();
    float y = event.getY();

    bool invert_y = event.getMouseYOrientation()==osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS;
    if (invert_y && gw->getTraits()) y = gw->getTraits()->height - y;

    event.addPointerData(new osgGA::PointerData(gw, x, 0, gw->getTraits()->width,
                                                    y, 0, gw->getTraits()->height));

    event.setMouseYOrientationAndUpdateCoords(osgGA::GUIEventAdapter::Y_INCREASING_UPWARDS);

    typedef std::vector<osg::Camera*> CameraVector;
    CameraVector activeCameras;

    osg::GraphicsContext::Cameras& cameras = gw->getCameras();
    for(osg::GraphicsContext::Cameras::iterator citr = cameras.begin();
        citr != cameras.end();
        ++citr)
    {
        osg::Camera* camera = *citr;
        if (camera->getAllowEventFocus() &&
            camera->getRenderTargetImplementation()==osg::Camera::FRAME_BUFFER)
        {
            osg::Viewport* viewport = camera ? camera->getViewport() : 0;
            if (viewport &&
                x >= viewport->x() && y >= viewport->y() &&
                x <= (viewport->x()+viewport->width()) && y <= (viewport->y()+viewport->height()) )
            {
                activeCameras.push_back(camera);
            }
        }
    }

    std::sort(activeCameras.begin(), activeCameras.end(), osg::CameraRenderOrderSortOp());

    osg::Camera* camera = activeCameras.empty() ? 0 : activeCameras.back();

    if (camera)
    {
        osg::Viewport* viewport = camera ? camera->getViewport() : 0;

        event.addPointerData(new osgGA::PointerData(camera, (x-viewport->x())/viewport->width()*2.0f-1.0f, -1.0, 1.0,
                                                            (y-viewport->y())/viewport->height()*2.0f-1.0f, -1.0, 1.0));

        osgViewer::View* view = dynamic_cast<osgViewer::View*>(camera->getView());
        osg::Camera* view_masterCamera = view ? view->getCamera() : 0;

        // if camera isn't the master it must be a slave and could need reprojecting.
        if (view && camera!=view_masterCamera)
        {
            generateSlavePointerData(camera, event);
        }
    }
}

void CompositeViewer::generateSlavePointerData(osg::Camera* camera, osgGA::GUIEventAdapter& event)
{
    osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(event.getGraphicsContext());
    if (!gw) return;

    // What type of Camera is it?
    // 1) Master Camera : do nothin extra
    // 2) Slave Camera, Relative RF, Same scene graph as master : transform coords into Master Camera and add to PointerData list
    // 3) Slave Camera, Relative RF, Different scene graph from master : do nothing extra?
    // 4) Slave Camera, Absolute RF, Same scene graph as master : do nothing extra?
    // 5) Slave Camera, Absolute RF, Different scene graph : do nothing extra?
    // 6) Slave Camera, Absolute RF, Different scene graph but a distortion correction subgraph depending upon RTT Camera (slave or master)
    //                              : project ray into RTT Camera's clip space, and RTT Camera's is Relative RF and sharing same scene graph as master then transform coords.

    // if camera isn't the master it must be a slave and could need reprojecting.


    osgViewer::View* view = dynamic_cast<osgViewer::View*>(camera->getView());
    if (!view) return;

    osg::Camera* view_masterCamera = view->getCamera();
    if (camera!=view_masterCamera)
    {
        float x = event.getX();
        float y = event.getY();

        bool invert_y = event.getMouseYOrientation()==osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS;
        if (invert_y && gw->getTraits()) y = gw->getTraits()->height - y;

        double master_min_x = -1.0;
        double master_max_x = 1.0;
        double master_min_y = -1.0;
        double master_max_y = 1.0;

        osg::Matrix masterCameraVPW = view_masterCamera->getViewMatrix() * view_masterCamera->getProjectionMatrix();
        if (view_masterCamera->getViewport())
        {
            osg::Viewport* viewport = view_masterCamera->getViewport();
            master_min_x = viewport->x();
            master_min_y = viewport->y();
            master_max_x = viewport->x()+viewport->width();
            master_max_y = viewport->y()+viewport->height();
            masterCameraVPW *= viewport->computeWindowMatrix();
        }

        // slave Camera tahnks to sharing the same View
        osg::View::Slave* slave = view ? view->findSlaveForCamera(camera) : 0;
        if (slave)
        {
            if (camera->getReferenceFrame()==osg::Camera::RELATIVE_RF && slave->_useMastersSceneData)
            {
                osg::Viewport* viewport = camera->getViewport();
                osg::Matrix localCameraVPW = camera->getViewMatrix() * camera->getProjectionMatrix();
                if (viewport) localCameraVPW *= viewport->computeWindowMatrix();

                osg::Matrix matrix( osg::Matrix::inverse(localCameraVPW) * masterCameraVPW );
                osg::Vec3d new_coord = osg::Vec3d(x,y,0.0) * matrix;
                //OSG_NOTICE<<"    pointer event new_coord.x()="<<new_coord.x()<<" new_coord.y()="<<new_coord.y()<<std::endl;
                event.addPointerData(new osgGA::PointerData(view_masterCamera, new_coord.x(), master_min_x, master_max_x,
                                     new_coord.y(), master_min_y, master_max_y));
            }
            else if (!slave->_useMastersSceneData)
            {
                // Are their any RTT Camera's that this Camera depends upon for textures?

                osg::ref_ptr<osgUtil::LineSegmentIntersector> ray = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, x,y);
                osgUtil::IntersectionVisitor iv(ray.get());
                camera->accept(iv);
                if (ray->containsIntersections())
                {
                    osg::Vec3 tc;
                    osg::Texture* texture = ray->getFirstIntersection().getTextureLookUp(tc);
                    if (texture)
                    {
                        // look up Texture in RTT Camera's.
                        for(unsigned int i=0; i<view->getNumSlaves(); ++i)
                        {
                            osg::Camera* slave_camera = view->getSlave(i)._camera.get();
                            if (slave_camera)
                            {
                                osg::Camera::BufferAttachmentMap::const_iterator ba_itr = slave_camera->getBufferAttachmentMap().find(osg::Camera::COLOR_BUFFER);
                                if (ba_itr != slave_camera->getBufferAttachmentMap().end())
                                {
                                    if (ba_itr->second._texture == texture)
                                    {
                                        osg::TextureRectangle* tr = dynamic_cast<osg::TextureRectangle*>(ba_itr->second._texture.get());
                                        osg::TextureCubeMap* tcm = dynamic_cast<osg::TextureCubeMap*>(ba_itr->second._texture.get());
                                        if (tr)
                                        {
                                            event.addPointerData(new osgGA::PointerData(slave_camera, tc.x(), 0.0f, static_cast<float>(tr->getTextureWidth()),
                                                                 tc.y(), 0.0f, static_cast<float>(tr->getTextureHeight())));
                                        }
                                        else if (tcm)
                                        {
                                            OSG_NOTICE<<"  Slave has matched texture cubemap"<<ba_itr->second._texture.get()<<", "<<ba_itr->second._face<<std::endl;
                                        }
                                        else
                                        {
                                            event.addPointerData(new osgGA::PointerData(slave_camera, tc.x(), 0.0f, 1.0f,
                                                                 tc.y(), 0.0f, 1.0f));
//.........这里部分代码省略.........

        virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa, osg::Object* object, osg::NodeVisitor* nv)
        {
            osg::AutoTransform* transform = dynamic_cast<osg::AutoTransform*>(object);
            if (!transform) return false;

            osg::NotifySeverity level = osg::INFO;
            
            switch(ea.getEventType())
            {
                case(osgGA::GUIEventAdapter::PUSH):
                case(osgGA::GUIEventAdapter::RELEASE):
                case(osgGA::GUIEventAdapter::MOVE):
                case(osgGA::GUIEventAdapter::DRAG):

                    osg::notify(level)<<std::endl<<"ea.getGraphicsContext()="<<ea.getGraphicsContext()<<std::endl;
                    osg::notify(level)<<"ea.getWindowWidth()="<<ea.getWindowWidth()<<std::endl;
                    osg::notify(level)<<"ea.getWindowHeight()="<<ea.getWindowHeight()<<std::endl;
                    osg::notify(level)<<"ea.getX()="<<ea.getX()<<std::endl;
                    osg::notify(level)<<"ea.getXin()="<<ea.getXmin()<<std::endl;
                    osg::notify(level)<<"ea.getXmax()="<<ea.getXmax()<<std::endl;
                    osg::notify(level)<<"ea.getY()="<<ea.getY()<<std::endl;
                    osg::notify(level)<<"ea.getYin()="<<ea.getYmin()<<std::endl;
                    osg::notify(level)<<"ea.getYmax()="<<ea.getYmax()<<std::endl;

                    _mousePostition.set(ea.getXnormalized(), ea.getYnormalized());
                    break;

                case(osgGA::GUIEventAdapter::FRAME):
                {
                    osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);


                    osg::Camera* camera = view->getCamera();
                    osg::Matrix VP =  camera->getViewMatrix() * camera->getProjectionMatrix();

                    osg::Matrix inverse_VP;
                    inverse_VP.invert(VP);

                    osg::Vec3d start_eye(_mousePostition.x(), _mousePostition.y(), 0.0);
                    osg::Vec3d end_eye(_mousePostition.x(), _mousePostition.y(), 1.0);

                    osg::Vec3d start_world = start_eye * inverse_VP;
                    osg::Vec3d end_world = start_eye * inverse_VP;

                    osg::notify(level)<<"start_world="<<start_world<<std::endl;
                    osg::notify(level)<<"end_world="<<end_world<<std::endl;

                    if (end_world.valid()) transform->setPosition(end_world);
                    else
                    {
                        OSG_NOTICE<<"Ignoring invalid end_world position"<<std::endl;
                    }

                    break;
                }
                case(osgGA::GUIEventAdapter::KEYDOWN):
                {
                    if (ea.getKey()=='c')
                    {
                        for(unsigned int i=0; i< transform->getNumChildren(); ++i)
                        {
                            osg::Node* node = transform->getChild(i);
                            node->setNodeMask(
                                node->getNodeMask()!=0 ?
                                0 :
                                0xffffff);
                        }
                    }
                    break;
                }
                default:
                    break;
            }
            return false;
        }