Draw line with border

[folibis]

Ok, in attached image I described what exactly I need.
And the code how I do it now:

QPoint line1[] = {QPoint(20,200),QPoint(400,200),QPoint(400,300),QPoint(20,300)};
     QPoint line2[] = {QPoint(100,100),QPoint(100,400),QPoint(200,400),QPoint(350,100)};
     QPen pen;
     pen.setCapStyle(Qt::RoundCap);
     pen.setJoinStyle(Qt::RoundJoin);
     pen.setColor(qRgb(201,199,182));
     pen.setWidth(14);
     painter.setPen(pen);
     painter.drawPolyline(line1,4);
     painter.drawPolyline(line2,4);
     pen.setColor(qRgb(237,234,200));
     pen.setWidth(10);
     painter.setPen(pen);
     painter.drawPolyline(line1,4);
     painter.drawPolyline(line2,4);

QPoint line1[] = {QPoint(20,200),QPoint(400,200),QPoint(400,300),QPoint(20,300)};
     QPoint line2[] = {QPoint(100,100),QPoint(100,400),QPoint(200,400),QPoint(350,100)};
     QPen pen;
     pen.setCapStyle(Qt::RoundCap);
     pen.setJoinStyle(Qt::RoundJoin);
     pen.setColor(qRgb(201,199,182));
     pen.setWidth(14);
     painter.setPen(pen);
     painter.drawPolyline(line1,4);
     painter.drawPolyline(line2,4);
     pen.setColor(qRgb(237,234,200));
     pen.setWidth(10);
     painter.setPen(pen);
     painter.drawPolyline(line1,4);
     painter.drawPolyline(line2,4);

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I was not successful with QPainterPathStroker and QPainterPath at all. It just draw closed lines and I really don't know how to use it.
Rectangles ... ok guys, may be you use thermonuclear anisotropic grasper to eat spaghetti I just use a fork for that.
It seems too confusing to me to draw a rectangle and rotate it when you need just line )))
And anyway, it will be a bit problematic to connect one this "line" to others.
As I understand it is impossible to draw line with border in Qt now and it is very frustrating to me.
So I'll continue to use my method.
Thanks to all who responded!