QPainterPath shapeLine(QPointF p1, QPointF p2) const
    {
        QPolygonF     pol,  pol2;
        QPainterPath path, path2;
        float delta = 2; //дополнительная область вокруг линии

        pol << QPointF(p1 + QPointF(-delta, -delta)) //1p1
            << QPointF(p2 + QPointF(-delta, -delta)) //1p2
            << QPointF(p2 + QPointF( delta,  delta)) //3p2
            << QPointF(p1 + QPointF( delta,  delta));//3p1

        pol2<< QPointF(p1 + QPointF( delta, -delta)) //4p1
            << QPointF(p2 + QPointF( delta, -delta)) //4p2
            << QPointF(p2 + QPointF(-delta,  delta)) //2p2
            << QPointF(p1 + QPointF(-delta,  delta));//2p1

        //path.setFillRule(Qt::WindingFill);
        path.addPolygon(pol);
        path2.addPolygon(pol2);
        return path.united(path2); 
    }

    QPainterPath shape() const
    {
        QPainterPath painterPath;

        for(int i = 0; i < points.count() - 1; i++)
        {
            painterPath.addPath(shapeLine(points[i], points[i + 1]));
        }

        return painterPath;
    }