From 82b1b61dfe18520b6bb197f7772d451dd43986da Mon Sep 17 00:00:00 2001
From: hanwen <hanwen>
Date: Wed, 13 Nov 2002 00:53:03 +0000
Subject: [PATCH] *** empty log message ***
---
lily/cluster-engraver.cc | 188 +++++++++++++++++++++++++++++++++++++++
1 file changed, 188 insertions(+)
create mode 100644 lily/cluster-engraver.cc
diff --git a/lily/cluster-engraver.cc b/lily/cluster-engraver.cc
new file mode 100644
index 0000000000..a9bd545314
--- /dev/null
+++ b/lily/cluster-engraver.cc
@@ -0,0 +1,188 @@
+/*
+ cluster-engraver.cc -- implement Cluster_engraver
+
+ (c) 2002 Juergen Reuter <reuter@ipd.uka.de>
+*/
+
+#include "engraver.hh"
+#include "item.hh"
+#include "spanner.hh"
+#include "note-head.hh"
+#include "warn.hh"
+
+class Cluster_engraver : public Engraver
+{
+
+protected:
+TRANSLATOR_DECLARATIONS(Cluster_engraver);
+ virtual void start_translation_timestep ();
+ virtual bool try_music (Music *);
+ virtual void process_music ();
+ virtual void acknowledge_grob (Grob_info);
+ virtual void stop_translation_timestep ();
+
+private:
+ Drul_array<Music*> reqs_drul_;
+ Pitch pitch_min, pitch_max;
+ Spanner *cluster;
+ SCM columns_scm;
+};
+
+void reset_min_max (Pitch *pitch_min, Pitch *pitch_max)
+{
+ /*
+ * (pitch_min > pitch_max) means that pitches are not yet
+ * initialized
+ */
+ *pitch_min = Pitch (0, 0, +1);
+ *pitch_max = Pitch (0, 0, -1);
+}
+
+Cluster_engraver::Cluster_engraver ()
+{
+ cluster = 0;
+ columns_scm = SCM_EOL;
+ reqs_drul_[LEFT] = reqs_drul_[RIGHT] = 0;
+}
+
+bool
+Cluster_engraver::try_music (Music *m)
+{
+ if (m->is_mus_type ("abort-event"))
+ {
+ reqs_drul_[START] = 0;
+ reqs_drul_[STOP] = 0;
+ if (cluster)
+ {
+ cluster->suicide ();
+ cluster = 0;
+ columns_scm = SCM_EOL;
+ }
+ }
+ else if (m->is_mus_type ("cluster-event"))
+ {
+ Direction d = to_dir (m->get_mus_property ("span-direction"));
+ reqs_drul_[d] = m;
+ return true;
+ }
+ return false;
+}
+
+void
+Cluster_engraver::process_music ()
+{
+ if (reqs_drul_[STOP])
+ {
+ if (!cluster)
+ {
+ reqs_drul_[STOP]->origin ()->warning ("can't find start of cluster");
+ }
+ else
+ {
+ Grob *bound = unsmob_grob (get_property ("currentMusicalColumn"));
+ cluster->set_bound (RIGHT, bound);
+ cluster->set_grob_property ("segments", columns_scm);
+ typeset_grob (cluster);
+ cluster = 0;
+ columns_scm = SCM_EOL;
+ }
+ reqs_drul_[STOP] = 0;
+ }
+ if (reqs_drul_[START])
+ {
+ if (cluster)
+ {
+ reqs_drul_[START]->origin ()->warning ("may not nest clusters");
+ }
+ else
+ {
+ SCM basicProperties = get_property ("Cluster");
+ cluster = new Spanner (basicProperties);
+ columns_scm = SCM_EOL;
+ Grob *bound = unsmob_grob (get_property ("currentMusicalColumn"));
+ cluster->set_bound (LEFT, bound);
+ announce_grob (cluster, bound->self_scm ());
+ }
+ reqs_drul_[START] = 0;
+ }
+}
+
+void
+Cluster_engraver::start_translation_timestep ()
+{
+ reset_min_max (&pitch_min, &pitch_max);
+}
+
+void
+Cluster_engraver::stop_translation_timestep ()
+{
+ if (cluster)
+ {
+ SCM column_scm = get_property ("currentMusicalColumn");
+ if (column_scm == SCM_EOL)
+ {
+ programming_error("failed retrieving current column");
+ return;
+ }
+
+ if (Pitch::compare (pitch_min, pitch_max) <= 0)
+ {
+ int staff_position = pitch_min.steps ();
+ SCM c0 = get_property ("centralCPosition");
+ if (gh_number_p (c0))
+ staff_position += gh_scm2int (c0);
+ SCM segment = scm_list_n (column_scm,
+ gh_int2scm (staff_position),
+ pitch_min.smobbed_copy (),
+ pitch_max.smobbed_copy (),
+ SCM_UNDEFINED);
+ segment = scm_list_n (segment, SCM_UNDEFINED);
+ columns_scm = (columns_scm != SCM_EOL) ?
+ gh_append2 (columns_scm, segment) : segment;
+ }
+ else
+ {
+ /* This timestep is caused by a different voice of the same
+ staff and hence should be ignored. */
+ }
+ }
+}
+
+void
+Cluster_engraver::acknowledge_grob (Grob_info info)
+{
+ Item *item = dynamic_cast <Item *>(info.grob_);
+ if (item)
+ {
+ if (Note_head::has_interface (info.grob_))
+ {
+ Music *nr = info.music_cause ();
+ if (nr && nr->is_mus_type ("note-event"))
+ {
+ Pitch pitch = *unsmob_pitch (nr->get_mus_property ("pitch"));
+ if (Pitch::compare (pitch_min, pitch_max) > 0) // already init'd?
+ {
+ // not yet init'd; use current pitch to init min/max
+ pitch_min = pitch;
+ pitch_max = pitch;
+ }
+ else if (Pitch::compare (pitch, pitch_max) > 0) // new max?
+ {
+ pitch_max = pitch;
+ }
+ else if (Pitch::compare (pitch, pitch_min) < 0) // new min?
+ {
+ pitch_min = pitch;
+ }
+ }
+ }
+ }
+}
+
+ENTER_DESCRIPTION(Cluster_engraver,
+/* descr */ "engraves a cluster",
+/* creats*/ "Cluster",
+/* accepts */ "cluster-event",
+/* acks */ "note-head-interface",
+/* reads */ "",
+/* write */ "");
--
2.39.5