[osg-users] osgQt aspect ratio issue when inside QMainWindow

[OpenSceneGraph Users]

Hi Mohamed,
thank you for your reply. Actually, the methods initializeGL, resizeGL 
and paintGL are not virtual and are already implemented inside the 
osgQOpenGLWidget class.
Probably there's some function inside these methods that is called only 
once, probably at window initialization, or that is effective only the at 
the first time.
I am currently reading the code but I am not an expert on OpenSceneGraph 
and I can't figure out what's missing (i.e. why window resize causes just 
an image stretch).


Il giorno lunedì 24 febbraio 2020 14:14:53 UTC+1, mohamed selim ha scritto:
>
> Hi Angelo,
>
> I believe you should handle from the osgQOpenGLWidget virtual methods, 
> which should be something like virtual void resizeGL( int width, int 
> height ); 
> As it's expected it should be called whenever there's a change in the 
> widget size. From there you would be able to call osgViewer::GraphicsWindowEmbedded 
> resized method as 
> well as camera's necessary adjustment for the new size and most important 
> the aspect ration for this new size.
>
>
> On Thursday, February 20, 2020 at 3:12:43 PM UTC+1, Angelo Emanuele 
> Fiorilla wrote:
>>
>> Hi,
>> I am trying to put an osgQOpenGLWidget inside a QMainWindow. I managed to 
>> made it quite easily but the resulting image is stretched and I cannot 
>> change its aspect ratio to made it right (the cow.osg is really stretched).
>> Can you help me, please? I have been struggling with this few lines of 
>> code for 5 days now.
>>
>> I can provide source code as follows...
>>
>> Thank you so much
>>
>> #include "mainwindow.h"
>>
>> MainWindow::MainWindow(QWidget *parent)
>>         : QMainWindow(parent)
>> {
>>     QSurfaceFormat format = QSurfaceFormat::defaultFormat();
>>     format.setVersion(2, 0);
>>     format.setProfile(QSurfaceFormat::CompatibilityProfile);
>>     format.setRenderableType(QSurfaceFormat::OpenGL);
>>     format.setOption(QSurfaceFormat::DebugContext);
>>     format.setDepthBufferSize(24);
>>     format.setSamples(8);
>>     format.setStencilBufferSize(8);
>>     format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
>>     QSurfaceFormat::setDefaultFormat(format);
>>
>>     osgWidget = new osgQOpenGLWidget(this);
>>     QObject::connect(osgWidget, &osgQOpenGLWidget::initialized, this, &MainWindow::setupOsgView);
>>
>>     setCentralWidget(osgWidget);
>>     osgWidget->show();
>> }
>>
>> void MainWindow::setupOsgView() {
>>
>>     osgWidget->getOsgViewer()->setCameraManipulator(new osgGA::TerrainManipulator());
>>     osgWidget->getOsgViewer()->addEventHandler(new osgGA::StateSetManipulator(osgWidget->getOsgViewer()->getCamera()->getOrCreateStateSet()));
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::ThreadingHandler);
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::WindowSizeHandler);
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::StatsHandler);
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::RecordCameraPathHandler);
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::LODScaleHandler);
>>     osgWidget->getOsgViewer()->addEventHandler(new osgViewer::ScreenCaptureHandler);
>>
>>     osg::ref_ptr<osg::Node> loadedModel = osgDB::readRefNodeFile("cow.osg");
>>     if(!loadedModel) {
>>         std::cout << "No data loaded" << std::endl;
>>     }
>>
>>     osgUtil::Optimizer optimizer;
>>     optimizer.optimize(loadedModel);
>>
>>     osgWidget->getOsgViewer()->setSceneData(loadedModel);
>> }
>>
>> MainWindow::~MainWindow()
>> {
>>
>> }
>>
>>

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