glbox.cpp Example File

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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();
  }