Qt 4.3: glbox.cpp Example File (activeqt/opengl/glbox.cpp)

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# glbox.cpp Example File
activeqt/opengl/glbox.cpp

     /****************************************************************************
     **
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     ** This file is part of the documentation of the Qt Toolkit.
     **
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    ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
    ** included in the packaging of this file.  Alternatively you may (at
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     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     ****************************************************************************/

     /****************************************************************************
     **
     ** This is a simple QGLWidget displaying an openGL wireframe box
     **
     ** The OpenGL code is mostly borrowed from Brian Pauls "spin" example
     ** in the Mesa distribution
     **
     ****************************************************************************/

     #include "glbox.h"
     #include <QAxAggregated>
     #include <QUuid>
     #include <objsafe.h>

     #if defined(Q_CC_MSVC)
     #pragma warning(disable:4305) // init: truncation from const double to float
     #endif

     /*!
       Create a GLBox widget
     */

     GLBox::GLBox( QWidget* parent, const char* name )
         : QGLWidget( parent )
     {
         xRot = yRot = zRot = 0.0;           // default object rotation
         scale = 1.25;                       // default object scale
         object = 0;
     }

     /*!
       Release allocated resources
     */

     GLBox::~GLBox()
     {
         makeCurrent();
         glDeleteLists( object, 1 );
     }

     /*!
       Paint the box. The actual openGL commands for drawing the box are
       performed here.
     */

     void GLBox::paintGL()
     {
         glClear( GL_COLOR_BUFFER_BIT );

         glLoadIdentity();
         glTranslatef( 0.0, 0.0, -10.0 );
         glScalef( scale, scale, scale );

         glRotatef( xRot, 1.0, 0.0, 0.0 );
         glRotatef( yRot, 0.0, 1.0, 0.0 );
         glRotatef( zRot, 0.0, 0.0, 1.0 );

         glCallList( object );
     }

     /*!
       Set up the OpenGL rendering state, and define display list
     */

     void GLBox::initializeGL()
     {
         qglClearColor(Qt::black);           // Let OpenGL clear to black
         object = makeObject();              // Generate an OpenGL display list
         glShadeModel( GL_FLAT );
     }

     /*!
       Set up the OpenGL view port, matrix mode, etc.
     */

     void GLBox::resizeGL( int w, int h )
     {
         glViewport( 0, 0, (GLint)w, (GLint)h );
         glMatrixMode( GL_PROJECTION );
         glLoadIdentity();
         glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 15.0 );
         glMatrixMode( GL_MODELVIEW );
     }

     /*!
       Generate an OpenGL display list for the object to be shown, i.e. the box
     */

     GLuint GLBox::makeObject()
     {
         GLuint list;

         list = glGenLists( 1 );

         glNewList( list, GL_COMPILE );

         qglColor(Qt::white);                      // Shorthand for glColor3f or glIndex

         glLineWidth( 2.0 );

         glBegin( GL_LINE_LOOP );
         glVertex3f(  1.0,  0.5, -0.4 );
         glVertex3f(  1.0, -0.5, -0.4 );
         glVertex3f( -1.0, -0.5, -0.4 );
         glVertex3f( -1.0,  0.5, -0.4 );
         glEnd();

         glBegin( GL_LINE_LOOP );
         glVertex3f(  1.0,  0.5, 0.4 );
         glVertex3f(  1.0, -0.5, 0.4 );
         glVertex3f( -1.0, -0.5, 0.4 );
         glVertex3f( -1.0,  0.5, 0.4 );
         glEnd();

         glBegin( GL_LINES );
         glVertex3f(  1.0,  0.5, -0.4 );   glVertex3f(  1.0,  0.5, 0.4 );
         glVertex3f(  1.0, -0.5, -0.4 );   glVertex3f(  1.0, -0.5, 0.4 );
         glVertex3f( -1.0, -0.5, -0.4 );   glVertex3f( -1.0, -0.5, 0.4 );
         glVertex3f( -1.0,  0.5, -0.4 );   glVertex3f( -1.0,  0.5, 0.4 );
         glEnd();

         glEndList();

         return list;
     }

     /*!
       Set the rotation angle of the object to \e degrees around the X axis.
     */

     void GLBox::setXRotation( int degrees )
     {
         xRot = (GLfloat)(degrees % 360);
         updateGL();
     }

     /*!
       Set the rotation angle of the object to \e degrees around the Y axis.
     */

     void GLBox::setYRotation( int degrees )
     {
         yRot = (GLfloat)(degrees % 360);
         updateGL();
     }

     /*!
       Set the rotation angle of the object to \e degrees around the Z axis.
     */

     void GLBox::setZRotation( int degrees )
     {
         zRot = (GLfloat)(degrees % 360);
         updateGL();
     }

     class ObjectSafetyImpl : public QAxAggregated,
                              public IObjectSafety
     {
     public:
         ObjectSafetyImpl() {}

         long queryInterface( const QUuid &iid, void **iface )
         {
             *iface = 0;
             if ( iid == IID_IObjectSafety )
                 *iface = (IObjectSafety*)this;
             else
                 return E_NOINTERFACE;

             AddRef();
             return S_OK;
         }

         QAXAGG_IUNKNOWN;

         HRESULT WINAPI GetInterfaceSafetyOptions( REFIID riid, DWORD *pdwSupportedOptions, DWORD *pdwEnabledOptions )
         {
             *pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
             *pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACESAFE_FOR_UNTRUSTED_CALLER;
             return S_OK;
         }
         HRESULT WINAPI SetInterfaceSafetyOptions( REFIID riid, DWORD pdwSupportedOptions, DWORD pdwEnabledOptions )
         {
             return S_OK;
         }
     };

     QAxAggregated *GLBox::createAggregate()
     {
         return new ObjectSafetyImpl();
     }