lily/system-start-delimiter.cc

   1 /*
   2   system-start-delimiter.cc --  implement System_start_delimiter
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include <math.h>
  10
  11 #include "axis-group-interface.hh"
  12 #include "system-start-delimiter.hh"
  13 #include "paper-def.hh"
  14 #include "molecule.hh"
  15 #include "font-interface.hh"
  16 #include "all-font-metrics.hh"
  17 #include "grob.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "lookup.hh"
  20
  21 Molecule
  22 System_start_delimiter::staff_bracket (Grob*me,Real height)
  23 {
  24   Real arc_height = gh_scm2double (me->get_grob_property ("arch-height")) ;
  25
  26   SCM at = gh_list (ly_symbol2scm ("bracket"),
  27                     me->get_grob_property ("arch-angle"),
  28                     me->get_grob_property ("arch-width"),
  29                     gh_double2scm (arc_height),
  30                     gh_double2scm (height),
  31                     me->get_grob_property ("arch-thick"),
  32                     me->get_grob_property ("bracket-thick"),
  33                     SCM_UNDEFINED);
  34
  35 /*
  36 TODO: sort this out.
  37
  38 Another thing:
  39 In system-start-delimiter.cc I see the line
  40
  41   Real h = height + 2 * arc_height;
  42
  43 But I really think that you mean
  44
  45  Real h = height + 2 * arc_width;
  46
  47 (arc_height changes the x-axis-size of arc ; arc_width changes the
  48 y-axis-size)
  49 Will not fix it since I'm not sure.
  50
  51    */
  52
  53   Real h = height + 2 * arc_height;
  54   Box b (Interval (0, 1.5), Interval (-h/2, h/2));
  55   Molecule mol (b, at);
  56   mol.align_to (X_AXIS, CENTER);
  57   return mol;
  58 }
  59
  60 void
  61 System_start_delimiter::set_interface (Grob*me)
  62 {
  63   me->set_interface (ly_symbol2scm ("system-start-delimiter-interface"));
  64 }
  65
  66 bool
  67 System_start_delimiter::has_interface (Grob*me)
  68 {
  69   return  me->has_interface (ly_symbol2scm ("system-start-delimiter-interface"));
  70 }
  71
  72 Molecule
  73 System_start_delimiter::simple_bar (Grob*me,Real h)
  74 {
  75   Real w = me->paper_l ()->get_var ("stafflinethickness") *
  76     gh_scm2double (me->get_grob_property ("thickness"));
  77   return Lookup::filledbox (Box (Interval (0,w), Interval (-h/2, h/2)));
  78 }
  79
  80 MAKE_SCHEME_CALLBACK (System_start_delimiter,after_line_breaking,1);
  81
  82 SCM
  83 System_start_delimiter::after_line_breaking (SCM smob)
  84 {
  85   try_collapse (unsmob_grob (smob));
  86   return SCM_UNSPECIFIED;
  87 }
  88
  89 void
  90 System_start_delimiter::try_collapse (Grob*me)
  91 {
  92   SCM   gl = me->get_grob_property ("glyph");
  93
  94   if (scm_ilength (me->get_grob_property ("elements")) <=  1 && gl == ly_symbol2scm ("bar-line"))
  95     {
  96       me->suicide ();
  97     }
  98
  99 }
 100
 101
 102 MAKE_SCHEME_CALLBACK (System_start_delimiter,brew_molecule,1);
 103
 104 SCM
 105 System_start_delimiter::brew_molecule (SCM smob)
 106 {
 107   Grob * me = unsmob_grob (smob);
 108
 109   SCM s = me->get_grob_property ("glyph");
 110   if (!gh_symbol_p (s))
 111     return SCM_EOL;
 112
 113   SCM c = me->get_grob_property ((ly_symbol2string (s) + "-collapse-height")
 114                                  .ch_C ());
 115
 116   Real staff_space = Staff_symbol_referencer::staff_space (me);
 117   Interval ext = ly_scm2interval (Axis_group_interface::group_extent_callback
 118  (me->self_scm (), gh_int2scm (Y_AXIS)));
 119   Real l = ext.length () / staff_space;
 120
 121   if (ext.empty_b ()
 122       || (gh_number_p (c) && l <= gh_scm2double (c)))
 123     {
 124       me->suicide ();
 125       return SCM_EOL;
 126     }
 127
 128   Molecule m;
 129   if (s == ly_symbol2scm ("bracket"))
 130     m = staff_bracket (me,l);
 131   else if (s == ly_symbol2scm ("brace"))
 132     m =  staff_brace (me,l);
 133   else if (s == ly_symbol2scm ("bar-line"))
 134     m = simple_bar (me,l);
 135
 136   m.translate_axis (ext.center (), Y_AXIS);
 137   return m.smobbed_copy ();
 138 }
 139
 140 Molecule
 141 System_start_delimiter::staff_brace (Grob*me, Real y)
 142 {
 143   Font_metric *fm = 0;
 144
 145   for (int i = 0; ; i++)
 146     {
 147       if (!fm || y > fm->get_char (fm->count ()-1)[Y_AXIS].length ())
 148         {
 149           /* We go through the style sheet to lookup the font file
 150              name.  This is better than using find_font directly,
 151              esp. because that triggers mktextfm for non-existent
 152              fonts. */
 153           SCM alist = gh_list (gh_cons (ly_symbol2scm ("font-family"),
 154                                         ly_symbol2scm ("braces")),
 155                                gh_cons (ly_symbol2scm ("font-relative-size"),
 156                                         gh_int2scm (i)),
 157                                SCM_UNDEFINED);
 158           fm = Font_interface::get_font (me, gh_list (alist, SCM_UNDEFINED));
 159           /* Hmm, if lookup fails, we get cmr10 anyway */
 160           if (ly_scm2string (gh_car (fm->description_)) == "cmr10")
 161             break;
 162         }
 163       else
 164         break;
 165     }
 166
 167   int lo = 0;
 168
 169   int hi = (fm->count () - 1) >? 2;
 170   Box b;
 171
 172   /* do a binary search for each Y, not very efficient, but passable?  */
 173   do
 174     {
 175       int cmp = (lo + hi) / 2;
 176       b = fm->get_char (cmp);
 177       if (b[Y_AXIS].empty_b () || b[Y_AXIS].length () > y)
 178         hi = cmp;
 179       else
 180         lo = cmp;
 181     }
 182   while (hi - lo > 1);
 183
 184   SCM at = gh_list (ly_symbol2scm ("char"), gh_int2scm (lo), SCM_UNDEFINED);
 185   at = fontify_atom (fm, at);
 186
 187   b = fm->get_char (lo);
 188   b[X_AXIS] = Interval (0,0);
 189
 190   return Molecule (b, at);
 191 }
 192