]> git.donarmstrong.com Git - lilypond.git/blobdiff - lily/beam-engraver.cc
release: 1.1.20
[lilypond.git] / lily / beam-engraver.cc
index 6ef0ba09fc68ec873e7f2b090f353ba24cfc3b7c..3165cf66607c863992c029adb4a2182d3526ae41 100644 (file)
-/*
-  beam-grav.cc -- implement Beam_engraver
-
+/*   
+  beam-engraver.cc --  implement Beam_engraver
+  
   source file of the GNU LilyPond music typesetter
+  
+  (c) 1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  
+ */
 
-  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-*/
-#include "duration-convert.hh"
-#include "time-description.hh"
 #include "beam-engraver.hh"
-#include "stem.hh"
-#include "beam.hh"
 #include "musical-request.hh"
+#include "beam.hh"
 #include "grouping.hh"
-#include "p-col.hh"
+#include "stem.hh"
 #include "warn.hh"
+#include "time-description.hh"
 
-Beam_engraver::Beam_engraver()
+Beam_engraver::Beam_engraver ()
 {
-  span_reqs_drul_[LEFT] = span_reqs_drul_[RIGHT] =0;
-  beam_p_ =0;
-  current_grouping_p_ =0;
+  beam_p_ = 0;
+  finished_beam_p_ =0;
+  finished_grouping_p_ = 0;
+  grouping_p_ =0;
+  reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
 }
 
 bool
-Beam_engraver::do_try_request(Request*r)
+Beam_engraver::do_try_music (Music *m)
 {
-  Musical_req* mus_l = r->access_Musical_req ();
-  if (!mus_l)
-    return false;
-
-  Beam_req* b = mus_l->access_Beam_req ();
-  if (!b)
-    return false;
-
-  if (bool (beam_p_) == bool (b->spantype == Span_req::START))
-    return false;
-
-  Direction d = (!beam_p_) ? LEFT : RIGHT;
-  if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (mus_l))
-    return false;
-
-  span_reqs_drul_[d] = b;
-  return true;
+  if (Beam_req * c = dynamic_cast<Beam_req*>(m))
+    {
+      reqs_drul_[c->spantype_] = c;
+      return true;
+    }
+  return false;
 }
 
+
 void
-Beam_engraver::do_process_requests()
+Beam_engraver::do_process_requests ()
 {
-  if (beam_p_ || !span_reqs_drul_[LEFT])
-    return;
+  if (reqs_drul_[STOP])
+    {
+      if (!beam_p_)
+       reqs_drul_[STOP]->warning (_("No beam to stop"));
+      finished_beam_p_ = beam_p_;
+      finished_grouping_p_ = grouping_p_;
 
-  current_grouping_p_ = new Rhythmic_grouping;
-  beam_p_ = new Beam;
+      beam_p_ = 0;
+      grouping_p_ = 0;
+    }
+  
+  if (reqs_drul_[START])
+    {
+      beam_p_ = new Beam;
+      grouping_p_ = new Rhythmic_grouping;
 
-  Scalar prop = get_property ("beamslopedamping");
-  if (prop.isnum_b ()) 
-    beam_p_->damping_i_ = prop;
+      Scalar prop = get_property ("beamslopedamping", 0);
+      if (prop.isnum_b ()) 
+       beam_p_->damping_i_ = prop;
 
-  prop = get_property ("beamquantisation");
-  if (prop.isnum_b ()) 
-    beam_p_->quantisation_ = (Beam::Quantisation)(int)prop;
+      prop = get_property ("beamquantisation", 0);
+      if (prop.isnum_b ()) 
+       beam_p_->quantisation_ = (Beam::Quantisation)(int)prop;
  
-  announce_element (Score_element_info (beam_p_, span_reqs_drul_[LEFT]));
+      // silly try at interstaff beam
+      // must set minVerticalAlign == maxVerticalAlign to get sane results
+      // see input/test/beam-interstaff.ly
+      prop = get_property ("minVerticalAlign", 0);
+      if (prop.isnum_b ())
+       beam_p_->vertical_align_f_ = prop;
+
+      prop = get_property ("maxVerticalAlign", 0);
+      if (prop.isnum_b ())
+       {
+         beam_p_->vertical_align_f_ += (Real)prop;
+         beam_p_->vertical_align_f_ /= (Real)2;
+       }
+
+      announce_element (Score_element_info (beam_p_, reqs_drul_[START]));
+    }
 }
 
 void
-Beam_engraver::do_pre_move_processing()
+Beam_engraver::typeset_beam ()
 {
-  if (!beam_p_ || !span_reqs_drul_[RIGHT]) 
-    return;
-
-  Rhythmic_grouping const * rg_C = get_staff_info().rhythmic_C_;
-  rg_C->extend (current_grouping_p_->interval());
-  beam_p_->set_grouping (*rg_C, *current_grouping_p_);
-  typeset_element (beam_p_);
-  beam_p_ = 0;
-
-  delete current_grouping_p_;
-  current_grouping_p_ = 0;
-
-  span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
+  if (finished_beam_p_)
+    {
+      Rhythmic_grouping const * rg_C = get_staff_info().rhythmic_C_;
+      rg_C->extend (finished_grouping_p_->interval());
+      finished_beam_p_->set_grouping (*rg_C, *finished_grouping_p_);
+      typeset_element (finished_beam_p_);
+      finished_beam_p_ = 0;
+    
+      delete finished_grouping_p_;
+      finished_grouping_p_= 0;
+    
+      reqs_drul_[STOP] = 0;
+    }
 }
 
 void
-Beam_engraver::do_removal_processing()
+Beam_engraver::do_post_move_processing ()
 {
-  if (beam_p_)
-    {
-      span_reqs_drul_[LEFT]->warning (_("unterminated beam"));
-      typeset_element (beam_p_);
-      beam_p_ =0;
-    }
+  reqs_drul_ [START] =0;
 }
 
+void
+Beam_engraver::do_pre_move_processing ()
+{
+  typeset_beam ();
+}
 
 void
-Beam_engraver::acknowledge_element (Score_element_info i)
+Beam_engraver::do_removal_processing ()
 {
-  if (!beam_p_ || !i.elem_l_->is_type_b (Stem::static_name ()))
-    return;
+  typeset_beam ();
+  finished_beam_p_ = beam_p_;
+  finished_grouping_p_ = grouping_p_;
+  typeset_beam ();
+}
 
-  Stem* s = (Stem*)i.elem_l_->access_Item ();
-  if (!i.req_l_ || !i.req_l_->access_Musical_req () || !i.req_l_->access_Musical_req ()->access_Rhythmic_req ())
-    {
-      ::warning ( _("Stem must have Rhythmic structure."));
-      return;
-    }
+void
+Beam_engraver::acknowledge_element (Score_element_info info)
+{
+    if (beam_p_)
+      {
+       Stem* stem_l = dynamic_cast<Stem *> (info.elem_l_);
+       if (!stem_l)
+         return;
+
+
+       Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
+       if (!rhythmic_req)
+         {
+           String s=_("Stem must have Rhythmic structure.");
+           if (info.req_l_)
+             info.req_l_->warning(s);
+           else
+             ::warning (s);
+         
+           return;
+         }
+      
+
+       if (rhythmic_req->duration_.durlog_i_<= 2)
+         {
+           rhythmic_req->warning (_ ("stem doesn't fit in beam"));
+           reqs_drul_[LEFT]->warning (_("beam was started here"));
+           return;
+         }
+
+       /*
+         TODO: do something sensible if it doesn't fit in the beam.
+       */
+       Moment start = get_staff_info().time_C_->whole_in_measure_;
+
+       if (!grouping_p_->child_fit_b (start))
+         {
+           String s (_("please fix me") + ": " 
+                     + _f ("stem at %s doesn't fit in beam", now_moment ().str ()));
+
+           if (info.req_l_)
+             info.req_l_->warning(s);
+           else 
+             warning (s);
+         }
+       else
+         {
+           grouping_p_->add_child (start, rhythmic_req->duration ());
+           stem_l->flag_i_ = rhythmic_req->duration_.durlog_i_;
+           beam_p_->add_stem (stem_l);
+         }
+      }
+}
 
-  Rhythmic_req *rhythmic_req = i.req_l_->access_Musical_req ()->access_Rhythmic_req ();
-  if (rhythmic_req->duration_.durlog_i_<= 2)
-    {
-      rhythmic_req->warning (_ ("stem doesn't fit in beam"));
-      return;
-    }
 
-  /*
-    TODO: do something sensible if it doesn't fit in the beam.
-   */
-  Moment start = get_staff_info().time_C_->whole_in_measure_;
 
-  if (!current_grouping_p_->child_fit_b (start))
-    {
-      String s (_("please fix me") + ": " 
-       + _f ("stem at %s doesn't fit in beam", now_moment ().str ()));
-      if (i.req_l_)
-       i.req_l_->warning(s);
-      else 
-       warning (s);
-    }
-  else
-    {
-      current_grouping_p_->add_child (start, rhythmic_req->duration ());
-      s->flag_i_ = rhythmic_req->duration_.durlog_i_;
-      beam_p_->add_stem (s);
-    }
-}
-IMPLEMENT_IS_TYPE_B1(Beam_engraver, Engraver);
 ADD_THIS_TRANSLATOR(Beam_engraver);