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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "system-start-delimiter.hh"
  11 #include "engraver.hh"
  12 #include "staff-symbol.hh"
  13 #include "group-interface.hh"
  14 #include "paper-column.hh"
  15 #include "output-def.hh"
  16 #include "spanner.hh"
  17
  18 class System_start_delimiter_engraver : public Engraver
  19 {
  20 public:
  21   TRANSLATOR_DECLARATIONS (System_start_delimiter_engraver);
  22
  23 protected:
  24   Spanner * delim_;
  25   virtual void acknowledge_grob (Grob_info);
  26   virtual void process_music ();
  27   virtual void finalize ();
  28 };
  29
  30
  31
  32 void
  33 System_start_delimiter_engraver::acknowledge_grob (Grob_info inf)
  34 {
  35   if (Staff_symbol::has_interface (inf.grob_))
  36     {
  37       /*
  38         don't add as Axis_group_interface::add_element (delim_,),
  39         because that would set the parent as well */
  40
  41       Pointer_group_interface::add_grob (delim_, ly_symbol2scm ("elements"),  inf.grob_);
  42     }
  43   else if (System_start_delimiter::has_interface (inf.grob_))
  44     {
  45       SCM gl = inf.grob_->get_property ("glyph");
  46       SCM my_gl = delim_->get_property ("glyph");
  47
  48       /*
  49         UGH UGH
  50        */
  51       if (ly_c_string_p (gl) && ly_c_equal_p (gl, scm_makfrom0str  ("brace"))
  52           && ly_c_string_p (my_gl) && ly_c_equal_p (my_gl, scm_makfrom0str  ("bracket")))
  53         inf.grob_->translate_axis (-0.8, X_AXIS); // ugh
  54       else if (ly_c_string_p (gl) && ly_c_equal_p (gl, scm_makfrom0str  ("bracket"))
  55                && ly_c_string_p (my_gl) && ly_c_equal_p (my_gl, scm_makfrom0str  ("bracket")))
  56        {
  57          inf.grob_->translate_axis ( -0.8, X_AXIS); // ugh
  58          inf.grob_->set_property ("arch-height",
  59                                        scm_make_real (ly_scm2double (inf.grob_->get_property
  60                                        ("arch-height"))+0.5));
  61        }
  62     }
  63 }
  64
  65 System_start_delimiter_engraver::System_start_delimiter_engraver ()
  66 {
  67   delim_ = 0;
  68 }
  69
  70 void
  71 System_start_delimiter_engraver::process_music ()
  72 {
  73   if (!delim_)
  74     {
  75       SCM delim_name =get_property ("systemStartDelimiter");
  76       delim_ = make_spanner_from_properties (this, delim_name, SCM_EOL);
  77
  78       delim_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  79
  80     }
  81 }
  82 void
  83 System_start_delimiter_engraver::finalize ()
  84 {
  85   if (delim_)
  86     {
  87       delim_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  88
  89     }
  90 }
  91
  92 ENTER_DESCRIPTION (System_start_delimiter_engraver,
  93 /* descr */       "Creates a system start delimiter (ie. SystemStart@{Bar,Brace,Bracket@} spanner",
  94 /* creats*/       "SystemStartBar SystemStartBrace SystemStartBracket",
  95 /* accepts */     "",
  96 /* acks  */      "system-start-delimiter-interface staff-symbol-interface",
  97 /* reads */       "systemStartDelimiter",
  98 /* write */       "");