lily/dynamic-performer.cc

   1 /*
   2   dynamic-performer.cc -- implement Dynamic_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "command-request.hh"
  11 #include "musical-request.hh"
  12 #include "audio-item.hh"
  13
  14 /*
  15   TODO:
  16     handle multiple requests
  17     handle span requests (crescendo/decrescendo)
  18  */
  19
  20 /**
  21    perform absolute (text) dynamics
  22  */
  23 class Dynamic_performer : public Performer
  24 {
  25 public:
  26   VIRTUAL_COPY_CONS (Translator);
  27
  28   Dynamic_performer ();
  29   ~Dynamic_performer ();
  30
  31 protected:
  32   void do_print () const;
  33   virtual bool do_try_music (Music* req_l);
  34   virtual void do_process_requests ();
  35   virtual void do_pre_move_processing ();
  36
  37 private:
  38   Text_script_req* text_script_req_l_;
  39   Audio_dynamic* audio_p_;
  40 };
  41
  42 ADD_THIS_TRANSLATOR (Dynamic_performer);
  43
  44 Dynamic_performer::Dynamic_performer ()
  45 {
  46   text_script_req_l_ = 0;
  47   audio_p_ = 0;
  48 }
  49
  50 Dynamic_performer::~Dynamic_performer ()
  51 {
  52 }
  53
  54 void
  55 Dynamic_performer::do_print () const
  56 {
  57 #ifndef NPRINT
  58   if (text_script_req_l_)
  59     text_script_req_l_->print ();
  60 #endif
  61 }
  62
  63 void
  64 Dynamic_performer::do_process_requests ()
  65 {
  66   if (text_script_req_l_)
  67     {
  68
  69       SCM s = scm_eval
  70         (gh_list
  71          (ly_symbol2scm ("dynamic-absolute-volume"),
  72           ly_quote_scm (ly_str02scm (text_script_req_l_->text_str_.ch_C ())),
  73           SCM_UNDEFINED));
  74       int volume = gh_scm2int (ly_eval_str ("dynamic-default-volume"));
  75       if (gh_number_p (s))
  76         volume = gh_scm2int (s);
  77
  78       audio_p_ = new Audio_dynamic (volume);
  79       Audio_element_info info (audio_p_, text_script_req_l_);
  80       announce_element (info);
  81       text_script_req_l_ = 0;
  82     }
  83 }
  84
  85 void
  86 Dynamic_performer::do_pre_move_processing ()
  87 {
  88   if (audio_p_)
  89     {
  90       play_element (audio_p_);
  91       audio_p_ = 0;
  92     }
  93 }
  94
  95 bool
  96 Dynamic_performer::do_try_music (Music* r)
  97 {
  98   if (!text_script_req_l_)
  99     {
 100       // urg, text script, style `dynamic' is how absolute dynamics appear
 101       if(Text_script_req* t = dynamic_cast <Text_script_req*> (r))
 102         {
 103           if (t->style_str_ == "dynamic")
 104             {
 105               text_script_req_l_ = t;
 106               return true;
 107             }
 108         }
 109     }
 110   return false;
 111 }
 112