[osg-users] [OsgQT] How to use this

[TORRALVO Mickaël]

Hi guys,

I'm currently trying to integrate OSG in a QT environnement. I'm working with QT 4.8 32bit and OSG 3.2.1 32 bit. When I create a project and configure it, all is ok. My problem is that i don't know how to use the osgQt package. I really need help to do this, how to use the package osgQt to add an osgViewer into my qt window.

Thank you!

Cheers,
TORRALVO

Ps : Sorry for my English I'm a french student and my english should be bad.

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[马国财]

Hi, I got a file maybe helpful to you. There's a .h file that defines an class of an osgView. In your project, there should be a ui, and add the code bottom.

#include "Viewer.h"

...

ViewerWidget *osgview;

 osgview = new ViewerWidget;

ui.horizontalLayout->addWidget(osgview);

The .h file:

#ifndef _SATLITEVIEWER_H_
#define _SATLITEVIEWER_H_

#include <osg/Node>
#include <QtCore/QTimer>
#include <QtGui/QApplication>
#include <QtGui/QGridLayout>
#include <osgViewer/CompositeViewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/TrackballManipulator>
#include <osgDB/ReadFile>
#include <osgQt/GraphicsWindowQt>
#include <iostream>

class ViewerWidget : public QWidget, public osgViewer::CompositeViewer
{
public:
	ViewerWidget(osgViewer::ViewerBase::ThreadingModel threadingModel=osgViewer::CompositeViewer::SingleThreaded)
	{
		setThreadingModel(threadingModel);
		osg::Group *root = new osg::Group;
		osg::Node *satNode = osgDB::readNodeFile("cow.osg");
		root->addChild(satNode);

		QWidget* widget1 = addViewWidget( createCamera(0,0,100,100), root );
		/*
		QWidget* widget2 = addViewWidget( createCamera(0,0,100,100), osgDB::readNodeFile("glider.osg") );
		QWidget* widget3 = addViewWidget( createCamera(0,0,100,100), osgDB::readNodeFile("axes.osg") );
		QWidget* widget4 = addViewWidget( createCamera(0,0,100,100), osgDB::readNodeFile("fountain.osg") );
		QWidget* popupWidget = addViewWidget( createCamera(900,100,320,240,"Popup window",true),
			osgDB::readNodeFile("dumptruck.osg") );
		popupWidget->show();
		*/
		QGridLayout* grid = new QGridLayout;
		grid->addWidget( widget1, 0, 0 );
		/*grid->addWidget( widget2, 0, 1 );
		grid->addWidget( widget3, 1, 0 );
		grid->addWidget( widget4, 1, 1 );
		setLayout( grid );*/

		connect( &_timer, SIGNAL(timeout()), this, SLOT(update()) );
		_timer.start( 10 );
	}

	QWidget* addViewWidget( osg::Camera* camera, osg::Group* group )
	{
		StartNetwork();
		osgViewer::Viewer* viewer = new osgViewer::Viewer;
		viewer->setCamera( camera );
		addView( viewer );
		viewer->setSceneData( group );
		viewer->addEventHandler( new osgViewer::StatsHandler );
		viewer->setCameraManipulator( new osgGA::TrackballManipulator );

		osgQt::GraphicsWindowQt* gw = dynamic_cast<osgQt::GraphicsWindowQt*>( camera->getGraphicsContext() );
		return gw ? gw->getGraphWidget() : NULL;
	}
	osg::Camera* createCamera( 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<osg::GraphicsContext::Traits> 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();

		osg::ref_ptr<osg::Camera> camera = new osg::Camera;
		camera->setGraphicsContext( new osgQt::GraphicsWindowQt(traits.get()) );

		camera->setClearColor( osg::Vec4(0.2, 0.2, 0.6, 1.0) );
		camera->setViewport( new osg::Viewport(0, 0, traits->width, traits->height) );
		camera->setProjectionMatrixAsPerspective(
			30.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 1.0f, 10000.0f );
		return camera.release();
	}

	virtual void paintEvent( QPaintEvent* event )
	{ frame(); }

protected:

	QTimer _timer;
};
#endif