how to keep the last elements of QPainterPath

I am drawing with QPainterPath at regular times. ALl in all, I have a slot called every 100 ms that updates the position of the tip adding a new point to the path. How could I keep the last 1000 points and discard and free the memory of the older ones?

No go with this one?

The only way I've thought of achieving this is by obtaining the path and modifying all its items. Something like:

Code:

---

QPainterPath p = item->path();
for(int i = 0; i < p.elementCount()-1; i++)
{
    auto e = p.elementAt(i+1);
    p.setElementPositionAt(i, e.x(), e.y());
}
p.moveTo(newpoint);
item->setPath(p);

---

But it's kind of lame to do it like this. If only there was the possibility of deleting the first or last item we could do it too.

Since I haven't found any documentation on how to do this and a few posts asking similar things without answer I'm considering building the path myself by storing a vector of lines, but i guess that would be costly too. Any help is appreciated. Is there a way to access the internal vector of the path?