Source/WindowSystem/QT4/testPassiveQT4.cpp

   1 // little example on how to use OpenSG with a standard QT OpenGL widget
   2 // should be independent of QT version, and might also be used as an example
   3 // on how ot integrate OpenSG into other windowing toolkits
   4
   5 // The only thing lost by doing it like this is the ability to separate the
   6 // rendering and interface threads. If you need that you will have to
   7 // use the real OpenSG QT widget.
   8
   9 // It is ASAP (as simple as possible ;), and thus probably not a good example
  10 // for style, but I hope it's good enough to see what's going on.
  11
  12 // This code is based on the QT opengl/gear example.
  13
  14 #include <math.h>
  15
  16 #include <Qt/qapplication.h>
  17 #include <QtOpenGL/QGLWidget>
  18 #include <QtGui/QMouseEvent>
  19
  20 #if defined(Q_CC_MSVC)
  21 #pragma warning(disable:4305) // init: truncation from const double to float
  22 #endif
  23
  24 #include "OSGConfig.h"
  25 #include "OSGSceneFileHandler.h"
  26 #include "OSGSimpleGeometry.h"
  27 #include "OSGPassiveWindow.h"
  28 #include "OSGSimpleSceneManager.h"
  29
  30 class OpenSGWidget : public QGLWidget
  31 {
  32 public:
  33     OpenSGWidget(const QGLFormat &f, QWidget *parent=0);
  34
  35     OSG::SimpleSceneManager *getManager(void);
  36 protected:
  37     void initializeGL();
  38     void resizeGL( int, int );
  39     void paintGL();
  40     void mousePressEvent( QMouseEvent *ev );
  41     void mouseMoveEvent( QMouseEvent *ev );
  42     void mouseReleaseEvent( QMouseEvent *ev );
  43     void wheelEvent( QWheelEvent *ev );
  44
  45     OSG::SimpleSceneManagerRefPtr mgr;
  46     OSG::PassiveWindowRecPtr      pwin;
  47 };
  48
  49 OpenSGWidget::OpenSGWidget(const QGLFormat &f, QWidget *parent)
  50      : QGLWidget(f, parent)
  51 {
  52     setAutoBufferSwap(false);
  53     mgr  = OSG::SimpleSceneManager::create();
  54     pwin = OSG::PassiveWindow::create();
  55     mgr->setWindow(pwin);
  56 }
  57
  58 OSG::SimpleSceneManager *OpenSGWidget::getManager(void)
  59 {
  60     return mgr;
  61 }
  62
  63
  64 void OpenSGWidget::initializeGL()
  65 {
  66     pwin->init();
  67 }
  68
  69 void OpenSGWidget::resizeGL( int width, int height )
  70 {
  71     mgr->resize(width,height);
  72 }
  73
  74 void OpenSGWidget::paintGL()
  75 {
  76     mgr->redraw();
  77     swapBuffers();
  78 }
  79
  80 void OpenSGWidget::mousePressEvent( QMouseEvent *ev )
  81 {
  82     OSG::UInt32 button;
  83
  84     switch ( ev->button() )
  85     {
  86         case Qt::LeftButton:
  87             button = OSG::SimpleSceneManager::MouseLeft;
  88             break;
  89         case Qt::MidButton:
  90             button = OSG::SimpleSceneManager::MouseMiddle;
  91             break;
  92         case Qt::RightButton:
  93             button = OSG::SimpleSceneManager::MouseRight;
  94             break;
  95         default:          return;
  96     }
  97     mgr->mouseButtonPress(button, ev->x(), ev->y());
  98     update();
  99 }
 100
 101 void OpenSGWidget::mouseReleaseEvent( QMouseEvent *ev )
 102 {
 103     OSG::UInt32 button;
 104
 105     switch ( ev->button() )
 106     {
 107         case Qt::LeftButton:
 108             button = OSG::SimpleSceneManager::MouseLeft;
 109             break;
 110         case Qt::MidButton:
 111             button = OSG::SimpleSceneManager::MouseMiddle;
 112             break;
 113         case Qt::RightButton:
 114             button = OSG::SimpleSceneManager::MouseRight;
 115             break;
 116         default:          return;
 117     }
 118     mgr->mouseButtonRelease(button, ev->x(), ev->y());
 119     update();
 120 }
 121
 122 void OpenSGWidget::mouseMoveEvent( QMouseEvent *ev )
 123 {
 124     mgr->mouseMove(ev->x(), ev->y());
 125     update();
 126 }
 127
 128 void OpenSGWidget::wheelEvent( QWheelEvent *ev )
 129 {
 130     mgr->mouseButtonPress(ev->delta() > 0 ? OSG::SimpleSceneManager::MouseUp
 131                                           : OSG::SimpleSceneManager::MouseDown,
 132                           ev->x(), ev->y());
 133
 134     ev->accept();
 135     update();
 136 }
 137
 138
 139 int main( int argc, char **argv )
 140 {
 141     OSG::osgInit(argc,argv);
 142
 143     QApplication::setColorSpec( QApplication::CustomColor );
 144     QApplication a( argc, argv );
 145
 146     if ( !QGLFormat::hasOpenGL() ) {
 147     qWarning( "This system has no OpenGL support. Exiting." );
 148     return -1;
 149     }
 150
 151     OpenSGWidget w(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer | QGL::Rgba |
 152                              QGL::DirectRendering));
 153
 154     // create the scene
 155     OSG::NodeRecPtr scene;
 156
 157     if(argc > 1)
 158     {
 159         scene = OSG::Node::create();
 160         OSG::GroupRecPtr g = OSG::Group::create();
 161
 162         scene->setCore(g);
 163
 164         for(OSG::UInt16 i = 1; i < argc; ++i)
 165             scene->addChild(OSG::SceneFileHandler::the()->read(argv[i]));
 166     }
 167     else
 168     {
 169         scene = OSG::makeTorus(.5, 3, 16, 16);
 170     }
 171
 172     w.getManager()->setRoot(scene);
 173     w.getManager()->showAll();
 174
 175     w.show();
 176     return a.exec();
 177 }