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();
}