Axis_group_interface::part_of_line_pure_height (Grob *me, bool begin, int start, int end)
{
Spanner *sp = dynamic_cast<Spanner *> (me);
Axis_group_interface::part_of_line_pure_height (Grob *me, bool begin, int start, int end)
{
Spanner *sp = dynamic_cast<Spanner *> (me);