Qt-interest Archive, January 2008
How to use QPainter inside QGraphicsPixmapItem?
Message 1 in thread
Hi!
I am trying to create a QGraphicsPixmapItem and then use the QPainter to
draw freehand lines inside the item. Does any body know if it is possible?
Could you give me a exemple? If it is not, does any body have an alternative
way to do this?
I am using QT 4.3 and Windows XP.
Thanks!
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Message 2 in thread
William Marques Dias wrote:
> Hi!
>
> I am trying to create a QGraphicsPixmapItem and then use the QPainter
> to draw freehand lines inside the item. Does any body know if it is
> possible? Could you give me a exemple? If it is not, does any body
> have an alternative way to do this?
>
> I am using QT 4.3 and Windows XP.
>
> Thanks!
>
> --
> William Marques Dias
Hi William!
You can try to inherit QGraphicsPixmapItem and overload paint method
like this:
void YourClass::paint(QPainter *p, const QStyleOptionGraphicsItem *o,
QWidget *w) {
// draw here what you wish using p
QGraphicsPixmapItem::paint(p, o, w);
}
Anton I Alferov
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Message 3 in thread
On torsdag den 31. Januar 2008, William Marques Dias wrote:
> Hi!
>
> I am trying to create a QGraphicsPixmapItem and then use the QPainter to
> draw freehand lines inside the item. Does any body know if it is possible?
> Could you give me a exemple? If it is not, does any body have an
> alternative way to do this?
>
> I am using QT 4.3 and Windows XP.
QPixmap pixmap = item->pixmap;
QPainter painter(&pixmap);
// Paint here
painter.end();
item->setPixmap(pixmap);
Bo.
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Message 4 in thread
QPixmap pixmap;
QPainter painter;
QRectF * rect = new QRectF(startPoint, endPoint);
painter.begin(&pixmap);
painter.drawRect(*rect);
painter.end();
I tried this, but i get the warning: QPainter::begin: Paint device returned
engine == 0, type: 2
any idea?
2008/1/31, Bo Thorsen <bo@xxxxxxxxxxxxxxxxxxxxx>:
>
> On torsdag den 31. Januar 2008, William Marques Dias wrote:
> > Hi!
> >
> > I am trying to create a QGraphicsPixmapItem and then use the QPainter to
> > draw freehand lines inside the item. Does any body know if it is
> possible?
> > Could you give me a exemple? If it is not, does any body have an
> > alternative way to do this?
> >
> > I am using QT 4.3 and Windows XP.
>
> QPixmap pixmap = item->pixmap;
> QPainter painter(&pixmap);
> // Paint here
> painter.end();
> item->setPixmap(pixmap);
>
> Bo.
>
> --
>
> Thorsen Consulting ApS - Qt consulting services
> http://www.thorsen-consulting.dk
>
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