Trouble painting customized QGraphicsPathItem

[jkutchka]

Hello,
I am trying to create a class that inherits from QGraphicsPathItem so that the class can have some custom data members. This will be helpful when selecting an item on the scene with a mouse click and then displaying or changing attributes of that selected item.
The code that adds a new path to to a view is:

void processPath(QPainterPath newPath)
{
   newPath = mapToScene(newPath);
   QGraphicsPathItem *newItem = new QGraphicsPathItem(newPath);
   newItem->setPen(ItemPen);
   newItem->setBrush(ItemFill);
   CareZone *newCZ = new CareZone(newItem);
   CZGraphicsItem *newCZGI = new CZGraphicsItem(newItem,newCZ);
 
   scene()->addItem(newCZGI);
   carezones.push_back(newCZ);
   viewport()->update();
}

void processPath(QPainterPath newPath)
{
   newPath = mapToScene(newPath);
   QGraphicsPathItem *newItem = new QGraphicsPathItem(newPath);
   newItem->setPen(ItemPen);
   newItem->setBrush(ItemFill);
   CareZone *newCZ = new CareZone(newItem);
   CZGraphicsItem *newCZGI = new CZGraphicsItem(newItem,newCZ);

   scene()->addItem(newCZGI);
   carezones.push_back(newCZ);
   viewport()->update();
}

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If I change scene()->addItem(newCZGI) to scene()->addItem(newItem) it works but then it is using a QGraphicsPathItem and not a the customized CZGraphicsItem. CareZone is a class that contains data members. CZGraphicsItem contains a pointer to it.

I have added paint() and boundingRect() functions to the CZGraphicsItem class.

The paint method is :

void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0)
{
    qDebug() << "paint called" ;
    painter->setPen(gpi->pen());
    painter->setBrush(gpi->brush());
    painter->drawPath(gpi->shape());
    QGraphicsPathItem::paint(painter,option,widget);
}

void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0)
{
    qDebug() << "paint called" ;
    painter->setPen(gpi->pen());
    painter->setBrush(gpi->brush());
    painter->drawPath(gpi->shape());
    QGraphicsPathItem::paint(painter,option,widget);
}

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I think it should use the same paint method used by QGraphicsPathItem but I do not know how to do this. The same is true for boundingRect().
The boundingRect method is:

QRectF boundingRect()
{
    qDebug() << "boundRect() called";
    return gpi->boundingRect();
}

QRectF boundingRect()
{
    qDebug() << "boundRect() called";
    return gpi->boundingRect();
}

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gpi is the QGraphicsPathItem passed in the constructor (newItem in the first snippet of code).

I am not seeing either debugging message when running the applications. I do see a debug message that I placed in main though.

Thanks,
jkutchka

[anda_skoa]

If CZGraphicsItem is a QGraphicsPathItem, why doesn't it get a path?
What do you create newItem for?
Why are you passing it to CZGraphicsItem's constructor?

Cheers,
_

[jkutchka]

The problem was in the CZGraphicsItem constructor. I had:

CZGraphicsItem(QGraphicsPathItem *GPI, CareZone *cz) :
    QGraphicsPathItem(GPI)

CZGraphicsItem(QGraphicsPathItem *GPI, CareZone *cz) :
    QGraphicsPathItem(GPI)

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expecting a copy of the QGraphicsPathItem. Changing it to:

CZGraphicsItem(QGraphicsPathItem *GPI, CareZone *cz) :
    QGraphicsPathItem(GPI->shape())

CZGraphicsItem(QGraphicsPathItem *GPI, CareZone *cz) :
    QGraphicsPathItem(GPI->shape())

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fixed the problem.

[anda_skoa]

Why not just pass the path?

Cheers,
_