How can I include pen width to QPainterPath (QGraphicsItem Selection Problem)?

yaseminyilmaz

Hi all,

I've defined a new class inherited from QGraphicsItem. It's bounding rect has an arrow and curve. It can be easily selected by clicking it's arrow. But it's curve can't. I suppose the reason is corresponding with pen width. Please look at the following code. If I use mBoundingPath in the function checkPointSet, this problem occurs. If I use mRectF, it also has been selected when I click near of the graphic. How can I include pen width to mBoundingPath?

@
bool Flow::checkPointSet(QPointF point)
{
bool rc = false;

if (mBoundingPath.contains(point))
//if (mRectF.contains(point))
{
    rc = true;
}

return rc;

}
void Flow::updateBoundingRect()
{
mBoundingPath = QPainterPath();

addArrow();
addCurve();

prepareGeometryChange();
mRectF = mBoundingPath.boundingRect();
update();

}
void Flow::addArrow()
{
...
mArrowHead.clear();
mArrowHead.append(qLine.p2());
mArrowHead.append(arrowP1);
mArrowHead.append(arrowP2);
mBoundingPath.addPolygon(mArrowHead);
}
void Flow::addCurve()
{
...
mCurvePath = QPainterPath();
mCurvePath.moveTo(mNodeList[0]->coord());
mCurvePath.lineTo(mNodeList[1]->coord());

mBoundingPath.addPath(mCurvePath);

}

QPainterPath Flow::shape() const
{
QPainterPath path;
path.addRect(mRectF);

return path;
}

QRectF Flow::boundingRect() const
{
return mRectF;
}@

Thanks in advance for your helps,

Rems

To include the pen width in your bounding shape, you can use QPainterPathStroker:

@QPainterPathStroker stroker;
stroker.setWidth(w);
mBoundingPath = stroker.createStroke(mCurvePath);@

yaseminyilmaz

Thanks so much to you.

It has worked with your help. Thanks a lot again.