[Qt-interest] Finding location of a QGraphicsItem that is in a QGraphicsItemGroup

[Malyushytsky, Alex]

I would suggest you to check how
QGraphicsItem::ensureVisible(...) and  QGraphicsView::ensureVisible(...) work. QGraphicsView::ensureVisible does the check you need.

Alex


From: qt-interest-bounces+alex=wai.com at qt.nokia.com [mailto:qt-interest-bounces+alex=wai.com at qt.nokia.com] On Behalf Of Cole, Derek
Sent: Tuesday, June 14, 2011 7:59 AM
To: qt-interest at qt.nokia.com
Subject: [Qt-interest] Finding location of a QGraphicsItem that is in a QGraphicsItemGroup

I have a QGraphicsItemGroup that is layed out in a specific way, to make sure that the QGraphicsItem that compose it create a tiled version of a large image.

I am using a test like this
QList<QGraphicsItem *> groupItems =group->childItems();
while(!groupItems.isEmpty())
{
        Tile *tile = (Tile *)groupItems.first();
        QRectF itemRect = tile->mapRectFromScene(sceneRect);
        QRectF isec = itemRect.intersected(tile->boundingRect());
        if(isec.isEmpty())
            qDebug("Test was not visible!");
...
}
Is this the best way to test for which tiles are visible in the viewport? (Tile is a QGraphicsItem).
How can I find tile's position in the QGraphicsView?

I tried to use tile.pos() but it is not giving me the right answer. I think it might be because the QGraphicsItemGroup class I have created allows for scaling, and maybe that throws the positions off?


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