int m = x + dim.wid / 2;
cell(0).draw(pi, m - dim0.width() / 2, y - dim0.descent() - 2 - 5);
cell(1).draw(pi, m - dim1.width() / 2, y + dim1.ascent() + 2 - 5);
int m = x + dim.wid / 2;
cell(0).draw(pi, m - dim0.width() / 2, y - dim0.descent() - 2 - 5);
cell(1).draw(pi, m - dim1.width() / 2, y + dim1.ascent() + 2 - 5);