osg::CompositeViewer动态删除views程序中断

smengq

#include <osgViewer/Viewer>

#include <osgViewer/ViewerEventHandlers>

#include <osgViewer/CompositeViewer>

#include <osg/Node>

#include <osg/Geode>

#include <osg/Group>

#include <osg/Geometry>

#include <osg/Camera>

#include <osg/MatrixTransform>

#include <osg/PositionAttitudeTransform>

#include <osgDB/ReadFile>

#include <osgDB/WriteFile>

#include <osgGA/TrackballManipulator>

#include <osgUtil/Optimizer>

#include <iostream>

//动态删除视图窗口事件

class DeletSlaveView:public osgGA::GUIEventHandler

{

public:

DeletSlaveView(osg::ref_ptr<osgViewer::CompositeViewer>compositeViewer,osg::ref_ptr<osgViewer::View>view):m_compositeviewer(compositeViewer),m_view(view){}

     bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&aa )

     {

         switch(ea.getEventType())

         {

         case osgGA::GUIEventAdapter::KEYDOWN:

              {

                   if (ea.getKey()=='q')

                   {

                       m_compositeviewer->stopThreading();//使用是否正确？

                       m_compositeviewer->removeView(m_view);

                       m_compositeviewer->startThreading();//使用是否正确？

                   }

              }

              break;

         default:

              break;

         }

         return false;

     }

public:

     osg::ref_ptr<osgViewer::CompositeViewer>m_compositeviewer;

     osg::ref_ptr<osgViewer::View>m_view;

};

int main()

{

     //创建CompositeViewer对象

     osg::ref_ptr<osgViewer::CompositeViewer> viewer = new osgViewer::CompositeViewer() ;

     //读取牛的模型

     osg::ref_ptr<osg::Node> cow = osgDB::readNodeFile("cow.osg") ;

     //读取飞机模型

     osg::ref_ptr<osg::Node> cessna = osgDB::readNodeFile("cessna.osg");

     //优化场景数据

     osgUtil::Optimizer optimizer ;

     optimizer.optimize(cow.get());

     optimizer.optimize(cessna.get());

     //设置图形环境特性

     osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits();

     traits->x = 100;

     traits->y = 100;

     traits->width = 900;

     traits->height = 700;

     traits->windowDecoration = true;

     traits->doubleBuffer = true;

     traits->sharedContext = 0;

     //创建图形环境特性

          osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());

     if (gc->valid())

     {

         osg::notify(osg::INFO)<<"  GraphicsWindow has been created successfully."<<std::endl;

         //清除窗口颜色及清除颜色和深度缓冲

         gc->setClearColor(osg::Vec4f(0.2f,0.2f,0.6f,1.0f));

         gc->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     }

     else

     {

         osg::notify(osg::NOTICE)<<"  GraphicsWindow has not been created successfully."<<std::endl;

     }

     //视图一

     {

         //创建视图一

         osg::ref_ptr<osgViewer::View> view = new osgViewer::View;

         viewer->addView(view.get());

         //设置视图场景数据

         view->setSceneData(cow);

         //设置相机视口及图形环境

         view->getCamera()->setViewport(new osg::Viewport(0,0, traits->width/2, traits->width/2));

         view->getCamera()->setGraphicsContext(gc.get());

         //设置操作器

         view->setCameraManipulator(new osgGA::TrackballManipulator);

         

         //添加事件处理

         view->addEventHandler( new osgViewer::StatsHandler );

         view->addEventHandler( new osgViewer::WindowSizeHandler );

         view->addEventHandler( new osgViewer::ThreadingHandler );

         view->addEventHandler( new osgViewer::RecordCameraPathHandler );

         view->addEventHandler(new ModelMoveHandler);

     }

     //视图二

     

         osg::ref_ptr<osgViewer::View> view2 = new osgViewer::View;

         viewer->addView(view2.get());

         view2->setSceneData(cessna.get());

         view2->getCamera()->setViewport(new osg::Viewport(traits->width/2,0, traits->width/2, traits->height/2));

         view2->getCamera()->setGraphicsContext(gc.get());

         view2->setCameraManipulator(new osgGA::TrackballManipulator);

     //视图三

     

         osg::ref_ptr<osgViewer::View> view3 = new osgViewer::View;

         viewer->addView(view3.get());

         view3->setSceneData(cessna.get());

         //根据分辨率来确定合适的投影来保证显示的图形不变形

         double fovy, aspectRatio, zNear, zFar;

         view3->getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar);

         double newAspectRatio = double(traits->width) / double(traits->height/2);

         double aspectRatioChange = newAspectRatio / aspectRatio;

         if (aspectRatioChange != 1.0)

         {

              view3->getCamera()->getProjectionMatrix() *= osg::Matrix::scale(1.0/aspectRatioChange,1.0,1.0);

         }

         view3->getCamera()->setViewport(new osg::Viewport(0,traits->height/2, traits->width, traits->height/2));

         view3->getCamera()->setGraphicsContext(gc.get());

         view3->setCameraManipulator(new osgGA::TrackballManipulator);

//视图二调用动态删除事件，删除视图三

     view2->addEventHandler(new DeletSlaveView(viewer,view3));

     

     viewer->realize();

     //viewer->setThreadingModel(osgViewer::CompositeViewer:rawThreadPerContext);

     viewer->setThreadingModel(osgViewer::CompositeViewer::SingleThreaded);

     viewer->run() ;

     return 0 ;

}
以上程序添加了三个视图，之后程序运行后添加事件处理，在视图二上按键删除视图三，但是程序失败是怎么回事？

liuzhiyu123

哪里出错？

smengq

liuzhiyu123 发表于 2013-4-9 08:11
哪里出错？

出错位置指向 return 0;

array

1. m_compositeviewer->stopThreading();//使用是否正确？
   
2. m_compositeviewer->removeView(m_view);
   
3. m_compositeviewer->startThreading();//使用是否正确？

复制代码

理论上这样是可以的，不过实际中我个人始终不建议这么做，不如直接找到底层的GraphicsWindowWin32然后直接隐藏掉HWND

smengq

array 发表于 2013-4-12 10:23
理论上这样是可以的，不过实际中我个人始终不建议这么做，不如直接找到底层的GraphicsWindowWin32然后直接隐 ...

你好，怎样从CompsiteViewer找到底层的GraphicsWindowWin32？谢谢

liuzhiyu123

view camera GraphicContext GraphicsWindowWin32

smengq

liuzhiyu123 发表于 2013-4-12 11:55
view camera GraphicContext GraphicsWindowWin32

你好，view->getcamera->getGraphicContext->.....后面获取不到GraphicsWindowWin32对象，查看了一下GraphicsWindowWin32对象它继承自osgViewer::GraphicWindow，osgViewer::GraphicWindow继承自osg::GraphicsContext、osgGA::GUIActionAdapter类,从compsiteviewer类该怎么获取到？谢谢

liuzhiyu123

dynamic_cast

smengq

liuzhiyu123 发表于 2013-4-12 13:10
dynamic_cast

你好，我在去掉视图事件响应里这么做的：
if (ea.getKey()=='q')
{
osgViewer::GraphicsWindowWin32* G32 =dynamic_cast<osgViewer::GraphicsWindowWin32*>(m_view->getCamera()-        >getGraphicsContext());                                                                       
HWND hwnd=G32->getHWND();
::ShowWindow(hwnd,SW_HIDE);
}
结构将整个窗口都删除掉了，我原来的目的是只是删除视图三，该怎么做？谢谢

liuzhiyu123

您的所有camera都共用了一个gc  您说 它是属于谁的？