From 548075f8c20d76600ee58e7ab90aae277ff03f39 Mon Sep 17 00:00:00 2001
From: Han-Wen Nienhuys <hanwen@xs4all.nl>
Date: Tue, 30 May 2006 19:03:53 +0000
Subject: [PATCH] add lily/figured-bass-position-engraver.cc

---
 lily/figured-bass-position-engraver.cc | 120 +++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 lily/figured-bass-position-engraver.cc

diff --git a/lily/figured-bass-position-engraver.cc b/lily/figured-bass-position-engraver.cc
new file mode 100644
index 0000000000..af0d3be772
--- /dev/null
+++ b/lily/figured-bass-position-engraver.cc
@@ -0,0 +1,120 @@
+/*
+  figured-bass-position-engraver.cc -- implement Figured_bass_engraver
+
+  source file of the GNU LilyPond music typesetter
+
+  (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+*/
+
+#include "engraver.hh"
+
+#include "context.hh"
+#include "music.hh"
+#include "spanner.hh"
+#include "side-position-interface.hh"
+#include "translator.icc"
+#include "axis-group-interface.hh"
+
+class Figured_bass_position_engraver : public Engraver
+{
+  TRANSLATOR_DECLARATIONS(Figured_bass_position_engraver);
+
+  Spanner *bass_figure_alignment_;
+  Spanner *positioner_;
+  vector<Grob*> note_columns_;
+
+protected:
+  DECLARE_ACKNOWLEDGER (note_column);
+  DECLARE_ACKNOWLEDGER (bass_figure_alignment);
+  DECLARE_END_ACKNOWLEDGER (bass_figure_alignment);
+
+  virtual void finalize ();
+  void start_spanner ();
+  void stop_spanner ();
+  void stop_translation_timestep ();
+};
+
+Figured_bass_position_engraver::Figured_bass_position_engraver ()
+{
+  positioner_ = 0;
+  bass_figure_alignment_ = 0;
+}
+
+void
+Figured_bass_position_engraver::start_spanner ()
+{
+  assert (!positioner_);
+
+  positioner_ = make_spanner("BassFigureAlignmentPositioning", bass_figure_alignment_->self_scm ());
+  positioner_->set_bound (LEFT, bass_figure_alignment_->get_bound (LEFT));
+  Axis_group_interface::add_element (positioner_, bass_figure_alignment_);
+}
+
+void
+Figured_bass_position_engraver::stop_spanner ()
+{
+  if (positioner_ && !positioner_->get_bound (RIGHT))
+    {
+      positioner_->set_bound (RIGHT, bass_figure_alignment_->get_bound (RIGHT));
+    }
+  
+  positioner_ = 0;
+  bass_figure_alignment_ = 0;
+}
+
+void
+Figured_bass_position_engraver::finalize () 
+{
+  stop_spanner ();
+}
+
+void
+Figured_bass_position_engraver::acknowledge_note_column (Grob_info info)
+{
+  note_columns_.push_back (info.grob ());
+}
+
+void
+Figured_bass_position_engraver::stop_translation_timestep ()
+{
+  if (positioner_)
+    {
+      for (vsize i = 0; i < note_columns_.size (); i++)
+	Side_position_interface::add_support (positioner_, note_columns_[i]);
+    }
+
+  note_columns_.clear ();
+}
+
+void
+Figured_bass_position_engraver::acknowledge_end_bass_figure_alignment (Grob_info info)
+{
+  (void)info;
+  stop_spanner ();
+}
+
+void
+Figured_bass_position_engraver::acknowledge_bass_figure_alignment (Grob_info info)
+{
+  bass_figure_alignment_ = dynamic_cast<Spanner*> (info.grob ());
+  start_spanner ();
+}
+
+
+ADD_ACKNOWLEDGER(Figured_bass_position_engraver,note_column);
+ADD_ACKNOWLEDGER(Figured_bass_position_engraver,bass_figure_alignment);
+ADD_END_ACKNOWLEDGER(Figured_bass_position_engraver,bass_figure_alignment);
+
+ADD_TRANSLATOR (Figured_bass_position_engraver,
+		/* doc */
+		"Position figured bass alignments over notes.",
+		
+		/* create */
+		"BassFigureAlignmentPositioning ",
+
+		/* accept */ "",
+
+		/* read */
+		" ",
+		/* write */ "");
-- 
2.39.2