Painter not painting over 32,765 px in width of QGraphicsItem/QGraphicsObject

lansing

I have a QGraphicsItem/QGraphicsObject that's going to expand in width on scroll, and I have filled the background with a red. The problem came when my width got over 32,765 px, the painter stopped painting those area, so I ended up with no red background for the end of the item.

mygraphicsitem.cpp

QRectF MyItem::boundingRect() const
{    
    return QRectF(0, 0, 33000, 40);
}

void MyItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{    
    QBrush redBrush(Qt::red);
    QRectF rec = boundingRect();

    painter->fillRect(rec, redBrush);

mrjj

Hi
https://doc.qt.io/qt-5/qpainter.html#details
"if you are using coordinates with Qt's raster-based paint engine, it is important to note that, while coordinates greater than +/- 2^15 can be used, any painting performed with coordinates outside this range is not guaranteed to be shown; the drawing may be clipped. This is due to the use of short int in the implementation."

I think this is what you are seeing.

lansing

@mrjj Thanks, so I hit the limit. I'll try not to go over that.