2 axis-group-interface-scheme.cc -- implement Axis_group_interface bindings
4 source file of the GNU LilyPond music typesetter
6 (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "axis-group-interface.hh"
10 #include "lily-guile.hh"
12 #include "grob-array.hh"
14 LY_DEFINE (ly_relative_group_extent, "ly:relative-group-extent",
15 3, 0, 0, (SCM elements, SCM common, SCM axis),
16 "Determine the extent of @var{elements} relative to @var{common} in the "
17 "@var{axis} direction.")
19 Grob_array *ga = unsmob_grob_array (elements);
21 SCM_ASSERT_TYPE (ga || scm_is_pair (elements), elements, SCM_ARG1, __FUNCTION__, "list or Grob_array");
22 SCM_ASSERT_TYPE (unsmob_grob (common), common, SCM_ARG2, __FUNCTION__, "grob");
23 SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
25 Link_array<Grob> elts;
28 for (SCM s = elements; scm_is_pair (s); s = scm_cdr (s))
29 elts.push (unsmob_grob (scm_car (s)));
32 Interval ext = Axis_group_interface::relative_group_extent (ga ? ga->array () : elts,
34 (Axis) scm_to_int (axis));
35 return ly_interval2scm (ext);