Merge branch 'lilypond/translation' of ssh://git.sv.gnu.org/srv/git/lilypond

[lilypond.git] / lily / beaming-pattern.cc

diff --git a/lily/beaming-pattern.cc b/lily/beaming-pattern.cc
index 1841f67900f468f0bea324712ebb0103887ecd56..56623d99a63a2d714317f0d72c826af27aefb562 100644 (file)
--- a/lily/beaming-pattern.cc
+++ b/lily/beaming-pattern.cc
@@ -1,20 +1,25 @@
 /*
-  beaming-info.cc -- implement Beam_rhythmic_element, Beaming_pattern
+  This file is part of LilyPond, the GNU music typesetter.
 
-  A Beaming_pattern object takes a set of stems at given moments and calculates
-  the pattern of their beam. That is, it works out, for each stem, how many
-  beams should be connected to the right and left sides of that stem. In
-  calculating this, Beaming_pattern takes into account
-   - the rhythmic position of the stems
-   - the options that are defined in Beaming_options
+  Copyright (C) 1999--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  source file of the GNU LilyPond music typesetter
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
 
-  (c) 1999--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "beaming-pattern.hh"
 #include "context.hh"
+#include "beam-settings.hh"
+#include "beaming-pattern.hh"
 
 /*
   Represents a stem belonging to a beam. Sometimes (for example, if the stem
@@ -52,7 +57,7 @@ Beam_rhythmic_element::de_grace ()
 {
   if (start_moment_.grace_part_)
     {
-      start_moment_.main_part_ = start_moment_.grace_part_; 
+      start_moment_.main_part_ = start_moment_.grace_part_;
       start_moment_.grace_part_ = 0;
     }
 }
@@ -70,7 +75,7 @@ Beam_rhythmic_element::count (Direction d) const
   CENTER.
 */
 Direction
-Beaming_pattern::flag_direction (vsize i) const
+Beaming_pattern::flag_direction (Beaming_options const &options, vsize i) const
 {
   // The extremal stems shouldn't be messed with, so it's appropriate to
   // return CENTER here also.
@@ -81,6 +86,16 @@ Beaming_pattern::flag_direction (vsize i) const
   int left_count = infos_[i-1].count (RIGHT);
   int right_count = infos_[i+1].count (LEFT);
 
+  // If we are told to subdivide beams and we are next to a beat, point the
+  // beamlet away from the beat.
+  if (options.subdivide_beams_)
+    {
+      if (infos_[i].rhythmic_importance_ < 0)
+       return RIGHT;
+      else if (infos_[i+1].rhythmic_importance_ < 0)
+       return LEFT;
+    }
+
   if (count <= left_count && count <= right_count)
     return CENTER;
 
@@ -123,12 +138,12 @@ Beaming_pattern::beamify (Beaming_options const &options)
 
   for (vsize i = 1; i < infos_.size () - 1; i++)
     {
-      Direction non_flag_dir = other_dir (flag_direction (i));
+      Direction non_flag_dir = other_dir (flag_direction (options, i));
       if (non_flag_dir)
        {
          int importance = (non_flag_dir == LEFT)
            ? infos_[i].rhythmic_importance_ : infos_[i+1].rhythmic_importance_;
-         int count = (importance < 0)
+         int count = (importance < 0 && options.subdivide_beams_)
            ? 1 : min (infos_[i].count (non_flag_dir),
                       infos_[i+non_flag_dir].count (-non_flag_dir));
 
@@ -140,7 +155,7 @@ Beaming_pattern::beamify (Beaming_options const &options)
 void
 Beaming_pattern::find_rhythmic_importance (Beaming_options const &options)
 {
-  Moment measure_pos (0);  
+  Moment measure_pos (0);
   SCM grouping = options.grouping_;
   vsize i = 0;
 
@@ -230,13 +245,58 @@ Beaming_pattern::beamlet_count (int i, Direction d) const
   return infos_.at (i).beam_count_drul_[d];
 }
 
+Moment
+Beaming_pattern::start_moment (int i) const
+{
+  return infos_.at (i).start_moment_;
+}
+
+Moment
+Beaming_pattern::end_moment (int i) const
+{
+  Duration *dur = new Duration (2 + max (beamlet_count (i, LEFT),
+                                        beamlet_count (i, RIGHT)),
+                               0);
+
+  return infos_.at (i).start_moment_ + dur->get_length();
+}
+
+bool
+Beaming_pattern::invisibility (int i) const
+{
+  return infos_.at (i).invisible_;
+}
+
+/*
+    Split a beamin pattern at index i and return a new
+    Beaming_pattern containing the removed elements
+*/
+Beaming_pattern *
+Beaming_pattern::split_pattern (int i)
+{
+  Beaming_pattern* new_pattern=0;
+  int count;
+
+  new_pattern = new Beaming_pattern ();
+  for (vsize j=i+1; j<infos_.size (); j++)
+    {
+      count = max(beamlet_count (j, LEFT), beamlet_count(j, RIGHT));
+      new_pattern->add_stem (start_moment (j),
+                             count,
+                             invisibility (j));
+    }
+  for (vsize j=i+1; j<infos_.size (); )
+    infos_.pop_back ();
+  return (new_pattern);
+}
+
 void
 Beaming_options::from_context (Context *context)
 {
-  grouping_ = context->get_property ("beatGrouping");
+  grouping_ = ly_beat_grouping (context->self_scm ());
   subdivide_beams_ = to_boolean (context->get_property ("subdivideBeams"));
   beat_length_ = robust_scm2moment (context->get_property ("beatLength"), Moment (1, 4));
-  measure_length_ = robust_scm2moment (context->get_property ("measureLength"), Moment (1, 4));
+  measure_length_ = robust_scm2moment (context->get_property ("measureLength"), Moment (4, 4));
 }
 
 Beaming_options::Beaming_options ()