osgQt.md

使用osgQt嵌入Qt应用程序

• OsgWidget.h

    #ifndef OSGWIDGET_H
    #define OSGWIDGET_H
     
    #include <QWidget>
    #include <osgViewer/Viewer>
    #include <osgQt/GraphicsWindowQt>
     
    namespace Ui {
    class OsgWidget;
    }
     
    class OsgWidget : public QWidget
    {
        Q_OBJECT
     
    public:
        explicit OsgWidget(QWidget *parent = 0);
     
    protected:
        void resizeEvent(QResizeEvent *event);
     
    protected:
        void initOsg();
        void loadOsg(QString osgFilePath);
     
    private slots:
        void on_pushButton_open_clicked();
     
    private:
        Ui::OsgWidget *ui;
     
    private:
        osg::ref_ptr<osgViewer::Viewer> _pViewer;
        osg::ref_ptr<osg::Viewport> _pViewport;
        osgQt::GLWidget * _pGLWidget;
        osgQt::GraphicsWindowQt* _pGraphicsWindowQt;
    };
     
    #endif // OSGWIDGET_H
  

• OsgWidget.cpp

    #include "OsgWidget.h"
    #include "ui_OsgWidget.h"
     
    #include <osgQt/GraphicsWindowQt>
    #include <osgViewer/Viewer>
    #include <osgGA/TrackballManipulator>
    #include <osgGA/StateSetManipulator>
    #include <osgViewer/ViewerEventHandlers>
    #include <osgDB/ReadFile>
     
    #include "define.h"
    #include <QFileDialog>
     
    OsgWidget::OsgWidget(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::OsgWidget),
        _pViewer(0),
        _pGLWidget(0),
        _pGraphicsWindowQt(0)
    {
        ui->setupUi(this);
        QString version = "V1.2.0";
        setWindowTitle(QString("OsgDemo %1").arg(version));
        initOsg();
    }
     
    void OsgWidget::resizeEvent(QResizeEvent *event)
    {
        if(_pGLWidget != 0)
        {
            _pGLWidget->move(0,0);
            _pGLWidget->resize(rect().size());
        }
    }
     
    void OsgWidget::initOsg()
    {
        // 使用osgQt步骤示例
        // 定义
    //    osg::ref_ptr<osgViewer::Viewer> _pViewer;
    //    osg::ref_ptr<osg::Viewport> _pViewport;
    //    osgQt::GLWidget * _pGLWidget;
    //    osgQt::GraphicsWindowQt* _pGraphicsWindowQt;
        // 步骤一：初始化qt窗口系统
        osgQt::initQtWindowingSystem();
        // 步骤二：创建视口
        _pViewer = new osgViewer::Viewer;
        // 步骤三：视口设为单线程（Qt5必须）
        _pViewer->setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
        // 步骤四：对视图的操作，必须，否则无法显示黑屏
        _pViewer->setCameraManipulator(new osgGA::TrackballManipulator);
        // 步骤五：视口操作
        _pViewer->setSceneData(osgDB::readNodeFile("glider.osg"));
        // 步骤六：设置osgQt视口(一个应用程序用opgQt同一时刻只能设置一个视口）
        osgQt::setViewer(_pViewer.get());
        // 步骤七：创建窗口(2个都要，只创建osgQt::GLWidget会挂掉）
    //    _pGLWidget = new osgQt::GLWidget();
        _pGLWidget = new osgQt::GLWidget(this);
        _pGraphicsWindowQt = new osgQt::GraphicsWindowQt(_pGLWidget);
        // 步骤八：设置视口
        _pViewport = new osg::Viewport(0, 0, _pGLWidget->width(), _pGLWidget->height());
        // 步骤九：设置摄像机视口范围，未设置不会显示，即窗口一片黑（刷新窗口但没有内容显示）
        _pViewer->getCamera()->setViewport(_pViewport);
        // 步骤十：设置刷新显示内容，未设置不会显示，即一片白（不会刷新窗口）
        _pViewer->getCamera()->setGraphicsContext(_pGraphicsWindowQt);
        // 步骤十一：显示
        _pGLWidget->show();
        _pGLWidget->lower();
    }
     
    void OsgWidget::loadOsg(QString osgFilePath)
    {
        _pViewer->setSceneData(osgDB::readNodeFile(osgFilePath.toStdString()));
    }
     
    void OsgWidget::on_pushButton_open_clicked()
    {
        QString filePath = QFileDialog::getOpenFileName(0, "打开...");
        if(!filePath.isEmpty())
        {
            _pViewer->setSceneData(osgDB::readNodeFile(filePath.toStdString()));
        }
    }