lily/system-start-delimiter-engraver.cc

   1 /*
   2   system-start-delimiter-engraver.cc -- implement System_start_delimiter_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "system-start-delimiter.hh"
  12 #include "engraver.hh"
  13 #include "staff-symbol.hh"
  14 #include "group-interface.hh"
  15 #include "paper-column.hh"
  16 #include "paper-def.hh"
  17 #include "spanner.hh"
  18
  19 class System_start_delimiter_engraver : public Engraver
  20 {
  21 public:
  22   TRANSLATOR_DECLARATIONS(System_start_delimiter_engraver);
  23
  24 protected:
  25   Spanner * delim_;
  26   virtual void acknowledge_grob (Grob_info);
  27   virtual void initialize ();
  28   virtual void finalize ();
  29 };
  30
  31
  32
  33 void
  34 System_start_delimiter_engraver::acknowledge_grob (Grob_info inf)
  35 {
  36   if (Staff_symbol::has_interface (inf.grob_l_))
  37     {
  38       /*
  39         don't add as Axis_group_interface::add_element (delim_,),
  40         because that would set the parent as well */
  41
  42       Pointer_group_interface::add_grob (delim_, ly_symbol2scm ("elements"),  inf.grob_l_);
  43     }
  44   else if (System_start_delimiter::has_interface (inf.grob_l_))
  45     {
  46       SCM gl = inf.grob_l_->get_grob_property ("glyph");
  47       SCM my_gl = delim_->get_grob_property ("glyph");
  48
  49       /*
  50         UGH UGH
  51        */
  52       if (gh_string_p (gl) && gh_equal_p (gl, ly_symbol2scm ("brace"))
  53           && gh_string_p (my_gl) && gh_equal_p (my_gl, ly_symbol2scm ("bracket")))
  54         inf.grob_l_->translate_axis (-0.8, X_AXIS); // ugh
  55       else if (gh_string_p (gl) && gh_equal_p (gl, ly_symbol2scm ("bracket"))
  56                && gh_string_p (my_gl) && gh_equal_p (my_gl, ly_symbol2scm ("bracket")))
  57        {
  58          inf.grob_l_->translate_axis ( -0.8, X_AXIS); // ugh
  59          inf.grob_l_->set_grob_property ("arch-height",
  60            gh_double2scm(gh_scm2double(inf.grob_l_->get_grob_property
  61                                        ("arch-height"))+0.5));
  62        }
  63     }
  64 }
  65
  66 System_start_delimiter_engraver::System_start_delimiter_engraver ()
  67 {
  68   delim_ = 0;
  69 }
  70
  71 void
  72 System_start_delimiter_engraver::initialize ()
  73 {
  74   SCM delim_name =get_property ("systemStartDelimiter");
  75   delim_ = new Spanner (internal_get_property (delim_name));
  76
  77   delim_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  78
  79
  80   announce_grob (delim_, SCM_EOL);
  81 }
  82
  83 void
  84 System_start_delimiter_engraver::finalize ()
  85 {
  86   delim_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  87   typeset_grob (delim_);
  88 }
  89
  90 ENTER_DESCRIPTION(System_start_delimiter_engraver,
  91 /* descr */       "creates a system start delimiter (ie. SystemStart@{Bar,Brace,Bracket@} spanner",
  92 /* creats*/       "SystemStartBar SystemStartBrace SystemStartBracket",
  93 /* acks  */       "system-start-delimiter-interface staff-symbol-interface",
  94 /* reads */       "systemStartDelimiter",
  95 /* write */       "");