lily/bar-line.cc

   1 /*
   2   bar.cc -- implement Bar
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <math.h>
  10
  11 #include "lookup.hh"
  12 #include "paper-column.hh"
  13 #include "grob.hh"
  14 #include "bar-line.hh"
  15 #include "string.hh"
  16 #include "molecule.hh"
  17 #include "paper-def.hh"
  18 #include "font-interface.hh"
  19
  20 #include "all-font-metrics.hh"
  21 #include "item.hh"
  22 #include "staff-symbol-referencer.hh"
  23
  24 MAKE_SCHEME_CALLBACK (Bar_line,brew_molecule,1);
  25
  26 SCM
  27 Bar_line::brew_molecule (SCM smob)
  28 {
  29   Grob * me = unsmob_grob (smob);
  30
  31   SCM s = me->get_grob_property ("glyph");
  32   SCM barsiz_proc = me->get_grob_property ("bar-size-procedure");
  33   if (gh_string_p (s) && gh_procedure_p (barsiz_proc))
  34     {
  35       String str  =ly_scm2string (s);
  36       SCM siz = gh_call1 (barsiz_proc, me->self_scm ());
  37       Real sz =  gh_scm2double (siz);
  38       if (sz < 0)
  39         return SCM_EOL;
  40
  41       return compound_barline (me, str, sz).smobbed_copy ();
  42     }
  43   return SCM_EOL;
  44 }
  45
  46
  47 Molecule
  48 Bar_line::compound_barline (Grob*me, String str, Real h)
  49 {
  50   Real kern = gh_scm2double (me->get_grob_property ("kern"));
  51   Real thinkern = gh_scm2double (me->get_grob_property ("thin-kern"));
  52   Real hair = gh_scm2double (me->get_grob_property ("hair-thickness"));
  53   Real fatline = gh_scm2double (me->get_grob_property ("thick-thickness"));
  54
  55   Real staffline = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
  56   Real staff_space = Staff_symbol_referencer::staff_space (me);
  57
  58   kern *= staffline;
  59   thinkern *= staffline;
  60   hair *= staffline;
  61   fatline *= staffline;
  62
  63   Molecule thin = simple_barline (me, hair, h);
  64   Molecule thick = simple_barline (me, fatline, h);
  65   Molecule colon;
  66   Molecule dot = Font_interface::get_default_font (me)->find_by_name ("dots-dot");
  67   Real dist = ( Staff_symbol_referencer::line_count (me) & 1 ? 1 :
  68                 (staff_space<2 ? 2 : .5) ) * staff_space;
  69   dot.translate_axis(dist/2,Y_AXIS);
  70   colon.add_molecule(dot);
  71   dot.translate_axis(-dist,Y_AXIS);
  72   colon.add_molecule(dot);
  73
  74   Molecule m;
  75
  76   if (str == "")
  77     {
  78       return Lookup::blank (Box (Interval (0, 0), Interval (-h/2, h/2)));
  79     }
  80   else if (str == "|")
  81     {
  82       return thin;
  83     }
  84   else if (str == "|." || (h == 0 && str == ":|"))
  85     {
  86       m.add_at_edge (X_AXIS, LEFT, thick, 0, 0);
  87       m.add_at_edge (X_AXIS, LEFT, thin, kern,0 );
  88     }
  89   else if (str == ".|" || (h == 0 && str == "|:"))
  90     {
  91       m.add_at_edge (X_AXIS, RIGHT, thick, 0, 0);
  92       m.add_at_edge (X_AXIS, RIGHT, thin, kern, 0);
  93     }
  94   else if (str == ":|")
  95     {
  96       m.add_at_edge (X_AXIS, LEFT, thick, 0, 0);
  97       m.add_at_edge (X_AXIS, LEFT, thin, kern, 0);
  98       m.add_at_edge (X_AXIS, LEFT, colon, kern, 0);
  99     }
 100   else if (str == "|:")
 101     {
 102       m.add_at_edge (X_AXIS, RIGHT, thick, 0, 0);
 103       m.add_at_edge (X_AXIS, RIGHT, thin, kern, 0);
 104       m.add_at_edge (X_AXIS, RIGHT, colon, kern, 0);
 105     }
 106   else if (str == ":|:")
 107     {
 108       m.add_at_edge (X_AXIS, LEFT, thick, thinkern, 0);
 109       m.add_at_edge (X_AXIS, LEFT, colon, kern, 0);
 110       m.add_at_edge (X_AXIS, RIGHT, thick, kern, 0);
 111       m.add_at_edge (X_AXIS, RIGHT, colon, kern, 0);
 112     }
 113   else if (str == ".|.")
 114     {
 115       m.add_at_edge (X_AXIS, LEFT, thick, thinkern, 0);
 116       m.add_at_edge (X_AXIS, RIGHT, thick, kern, 0);
 117     }
 118   else if (str == "||")
 119     {
 120       /*
 121         should align to other side? this never appears
 122         on the system-start?
 123       */
 124       m.add_at_edge (X_AXIS, RIGHT, thin, 0, 0);
 125       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern, 0);
 126     }
 127
 128   return m;
 129 }
 130
 131 Molecule
 132 Bar_line::simple_barline (Grob *me,Real w, Real h)
 133 {
 134   Real blot = me->get_paper ()->get_realvar (ly_symbol2scm ("blotdiameter"));
 135   return Lookup::round_filled_box (Box (Interval (0,w), Interval (-h/2, h/2)), blot);
 136 }
 137
 138 MAKE_SCHEME_CALLBACK (Bar_line,before_line_breaking ,1);
 139
 140 SCM
 141 Bar_line::before_line_breaking (SCM smob)
 142 {
 143   Grob*me=unsmob_grob (smob);
 144   Item * item = dynamic_cast<Item*> (me);
 145
 146   SCM g = me->get_grob_property ("glyph");
 147   SCM orig = g;
 148   Direction bsd = item->break_status_dir ();
 149   if (gh_string_p (g) && bsd)
 150     {
 151       SCM proc = me->get_grob_property ("break-glyph-function");
 152       g = gh_call2 (proc, g, scm_int2num (bsd));
 153     }
 154
 155   if (!gh_string_p (g))
 156     {
 157       me->set_grob_property ("molecule-callback", SCM_EOL);
 158       me->set_extent (SCM_EOL, X_AXIS);
 159       // leave y_extent for spanbar?
 160     }
 161
 162   if (! gh_equal_p (g, orig))
 163     me->set_grob_property ("glyph", g);
 164
 165   return SCM_UNSPECIFIED;
 166 }
 167
 168
 169
 170
 171 MAKE_SCHEME_CALLBACK (Bar_line,get_staff_bar_size,1);
 172 SCM
 173 Bar_line::get_staff_bar_size (SCM smob)
 174 {
 175   Grob*me = unsmob_grob (smob);
 176   Real ss = Staff_symbol_referencer::staff_space (me);
 177   SCM size = me->get_grob_property ("bar-size");
 178   if (gh_number_p (size))
 179     return gh_double2scm (gh_scm2double (size)*ss);
 180   else if (Staff_symbol_referencer::get_staff_symbol (me))
 181     {
 182       /*
 183         If there is no staff-symbol, we get -1 from the next
 184         calculation. That's a nonsense value, which would collapse the
 185         barline so we return 0.0 in the next alternative.
 186       */
 187       return gh_double2scm ((Staff_symbol_referencer::line_count (me) -1) * ss);
 188     }
 189   else
 190     return scm_int2num (0);
 191 }
 192
 193
 194
 195 ADD_INTERFACE (Bar_line, "bar-line-interface",
 196   "Bar line.\n"
 197 "\n"
 198 "Print a special bar symbol. It replaces the \n"
 199 "regular bar symbol with a special\n"
 200 "symbol.  The argument @var{bartype} is a string which specifies the\n"
 201 "kind of bar to print.  Options are @code{:|},\n"
 202 "@code{|:}, @code{:|:},\n"
 203 "@code{||}, @code{|.},\n"
 204 "@code{.|}, and @code{.|.}. \n"
 205 "\n"
 206 "These produce, respectively, a right repeat, a left repeat, a double\n"
 207 "repeat, a double bar, a start bar, an end bar, and a thick double bar.\n"
 208 "If @var{bartype} is set to @code{empty} then nothing is printed,\n"
 209 "but a line break is allowed at that spot.\n",
 210   "bar-size-procedure kern thin-kern hair-thickness thick-thickness glyph bar-size break-glyph-function");