glbox.cpp Example File

activeqt/opengl/glbox.cpp 
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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)
 {
     m_xRot = m_yRot = m_zRot = 0.0;       // default object rotation
     m_scale = 1.25;                       // default object scale
     m_object = 0;
 }

 /*!
   Release allocated resources
 */

 GLBox::~GLBox()
 {
     makeCurrent();

     if (m_object)
         glDeleteLists(m_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(m_scale, m_scale, m_scale);

     glRotatef(m_xRot, 1.0, 0.0, 0.0);
     glRotatef(m_yRot, 0.0, 1.0, 0.0);
     glRotatef(m_zRot, 0.0, 0.0, 1.0);

     glCallList(m_object);
 }

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

 void GLBox::initializeGL()
 {
     initializeOpenGLFunctions();

     qglClearColor(Qt::black);           // Let OpenGL clear to black
     m_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)
 {
     m_xRot = (GLfloat)(degrees % 360);
     updateGL();
 }

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

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

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

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

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

     long queryInterface(const QUuid &iid, void **iface)
     {
         *iface = nullptr;
         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();
 }

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