Diff between QBrush and QPen

[Lykurg]

thanks .. so i have to send QColor instead of QPen ...

If you want to sent a QColor why you define a constructor expecting a QPen? What's about defining:

...
LineItem(const QLineF &rect, const QPen &pen);
LineItem(const QLineF &rect, const QColor &color);
LineItem(const QLineF &rect, const Qt::GlobalColor color);

...
LineItem(const QLineF &rect, const QPen &pen);
LineItem(const QLineF &rect, const QColor &color);
LineItem(const QLineF &rect, const Qt::GlobalColor color);

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with for example:

LineItem(const QLineF &rect, const Qt::GlobalColor color)
   : QGraphicsLineItem(line)
{
  pen = QPen(QColor(color));
}

LineItem(const QLineF &rect, const Qt::GlobalColor color)
   : QGraphicsLineItem(line)
{
  pen = QPen(QColor(color));
}

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then you will be save.