OSG中使用Qt做界面

最近使用OSG做三维引擎开发，在外层使用Qt做主框架，三维渲染使用OSG，但是在OSG中想快速写出UI设计师设计的界面有时就显得吃力，OSG提供了osgQt来支持Qt嵌入OSG，那么如果能在OSG中直接使用Qt做界面必定事半功倍，于是在网络一顿胡搜，结果令人沮丧，大多标题写着osg嵌入Qt却干着Qt嵌入OSG的事。于是想到OSG的例子，进去也是一顿乱搜，不知道是我没找到还是真没有，本人反正没有收到。于是在经过各种测试找到了一种方法，原来osgQt本身就支持，这个类叫:QWidgetImage.

本人使用Qt5.8测试。

下面是代码：

1.引入所需头文件

#include "osg/Texture2D"

#include "osg/Geometry"

#include "osg/CullStack"

#include "osg/AutoTransform"

#include "osg/MatrixTransform"

#include "osg/PositionAttitudeTransform"

#include "osgDB/ReadFile"

#include "osgGA/TrackballManipulator"

#include "osgViewer/ViewerEventHandlers"

#include "osgViewer/Viewer"

#include "osgQt/QWidgetImage"

#include 

#include 

#include 

#include 

2.创建一个Qt窗体

QWidget* createWidget( const QString& movieFile, const QString& title)

{

  QLabel* label = new QLabel;

  QPushButton* playBtn = new QPushButton("Play " + title );

  QPushButton* stopBtn = new QPushButton("Stop " + title );

  QWidget* demo = new QWidget;

  demo->setLayout( new QVBoxLayout );

  demo->layout()->addWidget( label );

  demo->layout()->addWidget( playBtn );

  demo->layout()->addWidget( stopBtn );

  demo->setStyleSheet("background-color:lightblue;");

  QMovie* movie = new QMovie(movieFile);

  label->setMovie( movie );

  label->setFixedHeight( 400 );

  QObject::connect( playBtn, SIGNAL(clicked()), movie, SLOT(start()) );

  QObject::connect( stopBtn, SIGNAL(clicked()), movie, SLOT(stop()) );

  return demo;

}

3. 创建一个osg节点

osg::Node* createNode(const osg::Vec3& position, const QString& title， const QString &backgroundImage)

{

  osg::ref_ptr<osgQt::QWidgetImage> widgetImage =

    new osgQt::QWidgetImage( createDemoWidget(backgroundImage, title) );

  osg::ref_ptr<osgViewer::InteractiveImageHandler> handler =

    new osgViewer::InteractiveImageHandler( widgetImage.get() );

  osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D;

  texture->setImage( widgetImage.get() );

  osg::ref_ptr<osg::Geometry> quad =

    osg::createTexturedQuadGeometry(osg::Vec3(),

                                    osg::Vec3(widgetImage->getQWidget()->width(),0,0),

                                    osg::Vec3(0,widgetImage->getQWidget()->height(),0));

  quad->setEventCallback( handler.get() );

  quad->setCullCallback( handler.get() );

  osg::ref_ptr<osg::Geode> geode = new osg::Geode;

  geode->addDrawable(quad.get());

  geode->getOrCreateStateSet()->setTextureAttributeAndModes( 0, texture.get() );

  geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

  geode->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);

  geode->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

  osg::ref_ptr<osg::AutoTransform> autoNode = new osg::AutoTransform;

  autoNode->setAutoRotateMode(osg::AutoTransform::ROTATE_TO_SCREEN);

  autoNode->setAutoScaleToScreen(true);

  autoNode->addChild(geode.get());

  osg::ref_ptr<osg::PositionAttitudeTransform> pat = new osg::PositionAttitudeTransform;

  pat->setPosition(position);

  pat->addChild(geode.get());

  return pat.release();

}
4.将节点加入场景
int main( int argc, char** argv )

{

  QApplication app( argc, argv );

  osg::ref_ptr<osg::Group> root = new osg::Group;

  //root->addChild( createDemoNode(osg::Vec3(-1.0,0.0,0.0), "Widget 1", F:\\UrbanOMp\\resource\\image\\start_up_bk1.gif) );

  root->addChild( createDemoNode(osg::Vec3( 1.0,0.0,0.0), "Widget 2", F:\\UrbanOMp\\resource\\image\\start_up_bk1.gif) );

  osgViewer::Viewer viewer;

  viewer.setSceneData( root.get() );

  viewer.setCameraManipulator( new osgGA::TrackballManipulator );

  viewer.addEventHandler( new osgViewer::StatsHandler );

  while ( !viewer.done() )

  {

    QCoreApplication::processEvents( QEventLoop::AllEvents, 100 );

    viewer.frame();

  }

  return 0;

}
运行成功的在OSG中使用Qt，是不是太简单了。。。。。。。。。。。。。。。。。。。。。。。。。。