lily/axis-group-interface-scheme.cc

   1 /*
   2   axis-group-interface-scheme.cc -- implement Axis_group_interface bindings
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "axis-group-interface.hh"
  10 #include "lily-guile.hh"
  11 #include "grob.hh"
  12 #include "grob-array.hh"
  13
  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.")
  18 {
  19   Grob_array *ga = unsmob_grob_array (elements);
  20
  21   SCM_ASSERT_TYPE (ga || scm_is_pair (elements), elements, SCM_ARG1, __FUNCTION__, "list or Grob_array");
  22   LY_ASSERT_SMOB (Grob, common, 2);
  23   LY_ASSERT_TYPE (is_axis, axis, 3);
  24
  25   vector<Grob*> elts;
  26   if (!ga)
  27     {
  28       for (SCM s = elements; scm_is_pair (s); s = scm_cdr (s))
  29         elts.push_back (unsmob_grob (scm_car (s)));
  30     }
  31
  32   Interval ext = Axis_group_interface::relative_group_extent (ga ? ga->array () : elts,
  33                                                               unsmob_grob (common),
  34                                                               (Axis) scm_to_int (axis));
  35   return ly_interval2scm (ext);
  36 }
  37