new function Staff_symbol_referencer::extent_in_staff()

[lilypond.git] / lily / staff-symbol-referencer.cc

diff --git a/lily/staff-symbol-referencer.cc b/lily/staff-symbol-referencer.cc
index a74a1c07c948ecee9d18e8e095500dfb6afe8ed6..53637c86e5f1bd8fadc39ece6ee3dec4fdbc0f87 100644 (file)
--- a/lily/staff-symbol-referencer.cc
+++ b/lily/staff-symbol-referencer.cc
@@ -92,6 +92,25 @@ Staff_symbol_referencer::get_position (Grob *me)
   return robust_scm2double (me->get_property ("staff-position"), p);
 }
 
+
+Interval
+Staff_symbol_referencer::extent_in_staff (Grob *me)
+{
+  Grob *st = get_staff_symbol (me);
+  Grob *c = st ? me->common_refpoint (st, Y_AXIS) : 0;
+
+  Interval retval;
+  if (st && c)
+    {
+      retval  = me->extent (c, Y_AXIS)
+       - st->relative_coordinate (c, Y_AXIS);
+    }
+
+  return retval;
+}
+
+
+
 int
 Staff_symbol_referencer::get_rounded_position (Grob *me)
 {
@@ -172,3 +191,4 @@ ADD_INTERFACE (Staff_symbol_referencer,
               /* properties */
               "staff-position");
 
+