Custom QGraphicsItem

Hello everyone.
I try to create a custom QGraphicsitem.

This is the code of QGraphicsItemDot.h:

Code:

#ifndef QGRAPHICSITEMDOT_H
#define QGRAPHICSITEMDOT_H
#include <QWidget>
#include <QGraphicsItem>
#include <Qpainter>
#include <QRectF>
#include <QLine>
#include <QLineF>
#include <QPoint>
#include <QPointF>
#include <globalTypes.h>
 
class QGraphicsItemDot : public QGraphicsItem {
public:
 //QGraphicsItemDot(QPointF &dot, QGraphicsItem* parent = 0);
 void setDot(QPointF argdot);
 QRectF boundingRect() const;
 void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
 QPointF dot;
};
 
#endif

This is the code of QGraphicsItemDot.cpp:

Code:

#include "QGraphicsItemDot.h"
 
//QGraphicsItemDot::QGraphicsItemDot(QPointF &dot, QGraphicsItem* parent) : QGraphicsItem(parent) {
//setDot(dot);
//}
 
void QGraphicsItemDot::setDot(QPointF argdot) {
prepareGeometryChange();
dot = argdot;
update();
}
 
QRectF QGraphicsItemDot::boundingRect() const {
return QRectF(2, 2, 2, 2);
}
 
void QGraphicsItemDot::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
painter->drawPoint(dot);
}

Booth of this files compile ok.
I try to create and return a object like this:

Code:

QGraphicsItemDot qDrawData::createItemDot(tpStockDataRow coord) {
//Calculations...
QGraphicsItemDot tmpdot;
tmpdot.setDot(QPointF(xPos, yPos));
return tmpdot;
}

But this throws that error:

Code:

Error  1       error C2248: 'QGraphicsItem::QGraphicsItem' : cannot access private member declared in class 'QGraphicsItem'    QGraphicsItemDot.h 20

Can someone help me with this problem?
Thank you, Louis.