Andreas Aardal Hanssen wrote:
> The difference seems to be that QGraphicsSvgItem::paint leaves the painter
> in a translated state in 4.4, whereas in 4.3 it didn't. Wrapping the call
> to QGraphicsSvgItem::paint inside a QPainter::save/restore pair should
> work around the bug.
> Yes, it seems to be a bug, we'll try to fix it as soon as possible.
On closer inspection, the translation bug that this example shows seems to
be a bugfix, not a regression. The painter was previously left in a funny
state, but now it is no longer. If you run this example, which renders
before and after the call to QGraphicsSvgItem::paint(), you'll see that the
two rects are rendered at the right spot in 4.4, but in 4.3 (uncomment the
cache line in the constructor) the box is drawn in device coordinates.
The cache mode implementation in QGraphicsSvgItem previously left the
painter in device space, but as of 4.4, the painter state is properly
restored.
#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsSvgItem>
class ToDraw : public QGraphicsSvgItem
{
public:
ToDraw() : QGraphicsSvgItem("norway.svg")
{
setCacheMode(NoCache);
}
void paint ( QPainter * painter, const
QStyleOptionGraphicsItem * option, QWidget * widget )
{
painter->setPen(QPen(Qt::blue));
painter->setBrush(QColor(Qt::blue));
painter->drawRect(-10, -10, 20, 20);
QGraphicsSvgItem::paint(painter, option, widget);
painter->setPen(QPen(Qt::black));
painter->setBrush(QColor(Qt::black));
painter->drawRect(0, 0, 10, 10);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QGraphicsView *gv = new QGraphicsView();
QGraphicsScene *scene = new QGraphicsScene();
gv->setScene(scene);
gv->show();
gv->resize(800, 600);
ToDraw *item = new ToDraw;
item->setPos(QPoint(0,0));
item->setZValue(0);
scene->addItem(item);
return a.exec();
}
--
Andreas Aardal Hanssen
Senior Software Engineer, Team Lead / Widgets
Trolltech ASA - Sandakerveien 116, NO-0484 Oslo, Norway
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