Adding Custom Variable To QGraphicsItem, Possible?

[steadi]

Hello,

I am looking for a way to create a new variable for a qgraphicsitem. I need to set it for save and load purposes but how would i go about doing this?

The end result should be something along these lines:
QGraphicsItem *temp;
temp = scene->addPixmap([blah blah blah]);
temp->customvariable = 1; //This is the variable i want to create (int) for each time i add the graphicsitem

Thanks in advance and sorry if i did not explain this very well but it is late.
Matt

[ChrisW67]

Subclass QGraphicsItem, or one of its existing subclasses (QGraphicsPixmapItem in your example), and go to town. Standard C++ stuff.

[steadi]

Thanks for the help man. You have pointed me in the right direction which has helped alot.

class TileItem : public QObject, public QGraphicsPixmapItem
{
 Q_OBJECT
 
public:
    int mynewvariable();
    void setmynewvariable(int a);
};

class TileItem : public QObject, public QGraphicsPixmapItem
{
 Q_OBJECT

public:
    int mynewvariable();
    void setmynewvariable(int a);
};

To copy to clipboard, switch view to plain text mode 

Then for the setmynewvariable function:

void TileItem::setmynewvariable(int a)
{
    this->mynewvariable = a;
}

void TileItem::setmynewvariable(int a)
{
    this->mynewvariable = a;
}

To copy to clipboard, switch view to plain text mode 

But whenever i try to add this item to my graphicsscene:

TileItem *pix;
scene->addItem(pix);

TileItem *pix;
scene->addItem(pix);

To copy to clipboard, switch view to plain text mode 

It simply will not allow me. It crashed the whole program. Is there something i am overlooking?

Thanks again for the help,
Matt

[wysota]

You created a pointer to a TileItem object but you did not initialize it with a real object. Still standard C++ stuff.