Dimension const dim = dimension(*pi.base.bv);
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
Dimension const & dim1 = cell(1).dimension(*pi.base.bv);
int m = x + dim.wid / 2;
int yo = y - dim1.asc - dim0.des - 1;
cell(1).draw(pi, m - dim1.wid / 2, y);
Dimension const dim = dimension(*pi.base.bv);
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
Dimension const & dim1 = cell(1).dimension(*pi.base.bv);
int m = x + dim.wid / 2;
int yo = y - dim1.asc - dim0.des - 1;
cell(1).draw(pi, m - dim1.wid / 2, y);