[Qt-interest] QGraphicsView promotion

[Sajjad]

Hello forum,

I am trying to do opengl rendering to the QGraphicsView subclass. The
mainwindow consists several QGraphicsViiew widgets which i have promoted to
specialized ones.


I have set the viewport and enabled opengl rendering inside the constructor
of mainwindow() as follows:



*****************************

LightPositionWindow::LightPositionWindow(QWidget *parent)
    :QMainWindow(parent)
{
    setupUi(this);


    graphicsViewWorldSpace->setViewport(new
QGLWidget(QGLFormat(QGL::SampleBuffers)));

graphicsViewWorldSpace->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
    graphicsViewWorldSpace->setScene(new GraphicsWorldScene);

}


****************************


But the progeam exits with a warning that i have specified , saying that
OpenGL rendering context not found .


************************************''

void GraphicsWorldScene::drawBackground(QPainter *painter, const QRectF
&rect)
{
    Q_UNUSED(rect);


   * if(painter->paintEngine()->type() != QPaintEngine::OpenGL) {
        qWarning("Scene cannot be rendered without the OpenGL support");
        return;
    }*


glClearColor(mBackgroundColor.redF(),mBackgroundColor.greenF(),mBackgroundColor.blueF(),1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_PROJECTION);

    glPushMatrix();
    glLoadIdentity();
    gluPerspective(70,width()/height(),0.01,1000);

    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();

    const float pos[] = { mLightItem->x() - width() / 2, height() / 2 -
mLightItem->y(), 512, 0 };
    glLightfv(GL_LIGHT0, GL_POSITION, pos);
    //glColor4f(m_modelColor.redF(), m_modelColor.greenF(),
m_modelColor.blueF(), 1.0f);

    glPopMatrix();

    glMatrixMode(GL_PROJECTION);

    glPopMatrix();

}




***************************************

In  the above the bold statement gets executed and the program does not
proceed any furthur.


Any idea why it is not finding the OpenGL cotext?


Regards
Sajjad
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