lilypond-manuals.css: edit color scheme and some spacing

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

diff --git a/lily/beaming-pattern.cc b/lily/beaming-pattern.cc
index 135438e063c91673825a33326dd630e90be1ea94..46a46a5d2ea529aa4c1e09836413f4ee0b708d05 100644 (file)
--- a/lily/beaming-pattern.cc
+++ b/lily/beaming-pattern.cc
@@ -166,15 +166,26 @@ Beaming_pattern::beamify (Beaming_options const &options)
         Direction non_flag_dir = -flag_directions[i];
         if (non_flag_dir)
           {
-            int importance = infos_[i + 1].rhythmic_importance_;
-            int start_dur = intlog2(infos_[i+1].start_moment_.main_part_.den());
-            int count = (importance < 0 && options.subdivide_beams_) 
-                        ? max(start_dur,3)-2 // 1/8 note has one beam
-                        : min (min (infos_[i].count (non_flag_dir),
-                                        infos_[i + non_flag_dir].count (-non_flag_dir)),
-                                   infos_[i - non_flag_dir].count (non_flag_dir));
-
-            infos_[i].beam_count_drul_[non_flag_dir] = max(count, 1);
+            int count =
+                (infos_[i + 1].rhythmic_importance_ < 0 &&
+                 options.subdivide_beams_)
+                        // we're left of a subdivision
+                ?  (i != infos_.size () - 2)
+                   // respect the beam count for shortened beams ...
+                   ? max (beam_count_for_rhythmic_position (i + 1),
+                          beam_count_for_length (remaining_length (i + 1)))
+                   // ... except if there's only one trailing stem
+                   : beam_count_for_rhythmic_position (i + 1)
+
+                // we're at any other stem
+                : min (min (infos_[i].count (non_flag_dir),
+                            infos_[i + non_flag_dir].count (-non_flag_dir)),
+                       infos_[i - non_flag_dir].count (non_flag_dir));
+
+            // Ensure at least one beam is left, even for groups longer than 1/8
+            count = max (count, 1);
+
+            infos_[i].beam_count_drul_[non_flag_dir] = count;
           }
       }
 }
@@ -362,6 +373,25 @@ Beaming_pattern::end_moment (int i) const
          + infos_.at (i).factor_ * dur.get_length ();
 }
 
+Moment
+Beaming_pattern::remaining_length (int i) const
+{
+    return end_moment (infos_.size () - 1) - infos_[i].start_moment_;
+}
+
+int
+Beaming_pattern::beam_count_for_rhythmic_position (int idx) const
+{
+    // Calculate number of beams representing the rhythmic position of given stem
+    return intlog2(infos_[idx].start_moment_.main_part_.den()) - 2;
+}
+
+int
+Beaming_pattern::beam_count_for_length (Moment len) const
+{
+    return intlog2(len.main_part_.den()) - 2 - intlog2(len.main_part_.num());
+}
+
 bool
 Beaming_pattern::invisibility (int i) const
 {