Rendering a QGraphicsItem

[jonks]

Hi,

I'm trying to create an off-screen render of a QGraphicsItem before the application main window is shown.

My code that creates the is like this:

QPixmap* myObject::preview()
{
    QPixmap* image = new QPixmap(boundingRect().size().toSize());
    image->fill(QColor());
    QPainter imagePainter(image);
    imagePainter.translate(-boundingRect().topLeft());
 
    paint(&imagePainter, 0, 0);
 
     imagePainter.end();
 
     return image;
}

QPixmap* myObject::preview()
{
    QPixmap* image = new QPixmap(boundingRect().size().toSize());
    image->fill(QColor());
    QPainter imagePainter(image);
    imagePainter.translate(-boundingRect().topLeft());

    paint(&imagePainter, 0, 0);

     imagePainter.end();

     return image;
}

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I'm getting this error, which I cannot find documentation for:

QPainter::begin: Paint device returned engine == 0, type: 2
QPainter::translate: Painter not active
QPainter::end: Painter not active, aborted

A thread from back in 2007 seems to suggest that the code above should work.
http://lists.trolltech.com/qt-intere...ad00089-0.html

Any ideas?

Thanks
Jonks

[jonks]

Solved! - boundingRect() was returning (0,0)