p.setRenderHint(QPainter::Antialiasing, false);
p.drawLine(x, get_visual_y() + extents.first,
x, get_visual_y() + extents.second);
p.setRenderHint(QPainter::Antialiasing, false);
p.drawLine(x, get_visual_y() + extents.first,
x, get_visual_y() + extents.second);