Hi,
I've come across an issue I'm sort of confused about, and hopefully someone can
help figure it out.
I'm using osgQt & osgEarth 2.10 & osg 3.6.3 with Qt 5.12 on Windows 10. It all
seems to work, and I'm following the osgQt Viewer example for setting up my
program. My osg widget, when added to my frame, has the default margin and
spacing, so when I set it to my central widget (in a QMainWidget) it has a gray
border. However, when I set the margins to 0, it won't draw the map at all, and
it shows some artifacts around the edge of the widget.
This is what I'm doing:
Code:
OsgViewerQWidget::OsgViewerQWidget(QWidget* parent /*= 0*/, Qt::WindowFlags f
/*= 0*/, QStatusBar* statusBar /*= 0*/)
: QWidget(parent, f)
{
_map = new osgEarth::Map();
// add a TMS imagery layer:
osgEarth::Drivers::TMSOptions imagery;
imagery.url() = "http://readymap.org/readymap/tiles/1.0.0/7/;;
_map->addLayer(new osgEarth::ImageLayer("ReadyMap Imagery", imagery));
// add a TMS elevation layer:
osgEarth::Drivers::TMSOptions elevation;
elevation.url() = "http://readymap.org/readymap/tiles/1.0.0/116/;;
_map->addLayer(new osgEarth::ElevationLayer("ReadyMap Elevation", elevation));
graticuleLayer = new osgEarth::Util::GeodeticGraticule();
_map->addLayer(graticuleLayer);
// That's it, the map is ready; now create a MapNode to render the Map:
_mapNode = new osgEarth::MapNode(_map);
_mapNode->setNodeMask(0x1);
setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
// disable the default setting of viewer.done() by pressing Escape.
setKeyEventSetsDone(0);
QWidget* widget1 = AddViewWidget(CreateGraphicsWindow(0, 0, 100, 100),
_mapNode, statusBar);
QGridLayout* grid = new QGridLayout;
setLayout(grid);
grid->setSpacing(0);
//grid->setContentsMargins(0, 0, 0, 0); // with this line commented out,
it works, with it in, it doesn't work... but, why?!
grid->addWidget(widget1);
connect(&_timer, SIGNAL(timeout()), this, SLOT(update()));
_timer.start(10);
}
osgQt::GraphicsWindowQt* OsgViewerQWidget::CreateGraphicsWindow(int x, int y,
int w, int h, const std::string& name /*= ""*/, bool windowDecoration /*=
false*/)
{
osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
osg::ref_ptr traits = new
osg::GraphicsContext::Traits;
traits->windowName = name;
traits->windowDecoration = windowDecoration;
traits->x = x;
traits->y = y;
traits->width = w;
traits->height = h;
traits->doubleBuffer = true;
traits->alpha = ds->getMinimumNumAlphaBits();
traits->stencil = ds->getMinimumNumStencilBits();
traits->sampleBuffers = ds->getMultiSamples();
traits->samples = ds->getNumMultiSamples();
return new osgQt::GraphicsWindowQt(traits.get());
}
QWidget* OsgViewerQWidget::AddViewWidget(osgQt::GraphicsWindowQt* gw,
osg::ref_ptr scene, QStatusBar *statusBar)
{
osgViewer::View* view = new osgViewer::View;
addView(view);
osg::Camera* camera = view->getCamera();
camera->setGraphicsContext(gw);
// need to do this to make lines show up... o_O Thanks's Glenn!
osgEarth::Util::GLUtils::setGlobalDefaults(camera->getOrCreateStateSet());
const osg::GraphicsContext::Traits* traits = gw->getTraits();
camera->setClearColor(osg::Vec4(0.2, 0.2, 0.6, 1.0));
camera->setViewport(new osg::Viewport(0, 0, traits->width, traits->height));
// set the draw and read buffers up for a double buffered window with rendering
going to back buffer
camera->setDrawBuffer(GL_BACK);
camera->setReadBuffer(GL_BACK);
camera->setProjectionMatrixAsPerspective(30.0f,
static_cast(traits->width) / static_cast(traits->height), 1.0f,
1.0f);
view->setSceneData(scene);
view->addEventHandler(new osgViewer::StatsHandler);
view->addEventHandler(new
osgGA::StateSetManipulator(view->getCamera()->getOrCreateStateSet()));
view->addEventHandler(new osgViewer::ThreadingHandler());
view->addEventHandler(new osgViewer::LODScaleHandler());
view->addEventHandler(new osgViewer::ScreenCaptureHandler());
earthManip = new osgEarth::Util::EarthManipulator;
view->setCameraManipulator(earthManip);
ldBuffer = new osgEarth::Util::LogarithmicDepthBuffer;
ldBuffer->install(camera);
gw->setTouchEventsEnabled(true);
return gw->getGLWidget();
}
So it seems to go wrong in my constructor, when I set the grid layout content
margins to 0. Otherwise this works just fine. I set the margin to 0, and it
doesn't show anything.
Any ideas will be greatly appreciated.
Thank you!
David
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=76113#76113
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