Accidentally removed file.

diff --git a/lily/axis-group-interface-scheme.cc b/lily/axis-group-interface-scheme.cc
new file mode 100644 (file)
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+++ b/lily/axis-group-interface-scheme.cc
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+/*
+  axis-group-interface-scheme.cc -- implement Axis_group_interface bindings
+
+  source file of the GNU LilyPond music typesetter
+
+  (c) 2005--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
+
+#include "axis-group-interface.hh"
+#include "lily-guile.hh"
+#include "grob.hh"
+#include "grob-array.hh"
+
+LY_DEFINE (ly_relative_group_extent, "ly:relative-group-extent",
+          3, 0, 0, (SCM elements, SCM common, SCM axis),
+          "Determine the extent of @var{elements} relative to @var{common} in the"
+          " @var{axis} direction.")
+{
+  Grob_array *ga = unsmob_grob_array (elements);
+
+  SCM_ASSERT_TYPE (ga || scm_is_pair (elements), elements, SCM_ARG1, __FUNCTION__, "list or Grob_array");
+  LY_ASSERT_SMOB (Grob, common, 2);
+  LY_ASSERT_TYPE (is_axis, axis, 3);
+
+  vector<Grob*> elts;
+  if (!ga)
+    {
+      for (SCM s = elements; scm_is_pair (s); s = scm_cdr (s))
+       elts.push_back (unsmob_grob (scm_car (s)));
+    }
+
+  Interval ext = Axis_group_interface::relative_group_extent (ga ? ga->array () : elts,
+                                                             unsmob_grob (common),
+                                                             (Axis) scm_to_int (axis));
+  return ly_interval2scm (ext);
+}
+