lily/bar.cc

   1 /*
   2   bar.cc -- implement Bar
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include <math.h>
   9
  10 #include "lookup.hh"
  11 #include "paper-column.hh"
  12 #include "main.hh"
  13 #include "grob.hh"
  14 #include "bar.hh"
  15 #include "string.hh"
  16 #include "molecule.hh"
  17 #include "paper-def.hh"
  18 #include "font-interface.hh"
  19 #include "debug.hh"
  20 #include "all-font-metrics.hh"
  21 #include "item.hh"
  22 #include "staff-symbol-referencer.hh"
  23
  24 MAKE_SCHEME_CALLBACK (Bar,brew_molecule,1);
  25
  26 SCM
  27 Bar::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::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->paper_l ()->get_var ("stafflinethickness");
  56
  57   kern *= staffline;
  58   thinkern *= staffline;
  59   hair *= staffline;
  60   fatline *= staffline;
  61
  62   Molecule thin = simple_barline (me, hair, h);
  63   Molecule thick = simple_barline (me, fatline, h);
  64   Molecule colon = Font_interface::get_default_font (me)->find_by_name (
  65     Staff_symbol_referencer::line_count (me) & 1 == 1 ?
  66     "dots-repeatcolon" : "dots-evenrepeatcolon"
  67   );
  68
  69   Molecule m;
  70
  71   if (str == "")
  72     {
  73       return Lookup::blank (Box (Interval (0, 0), Interval (-h/2, h/2)));
  74     }
  75   else if (str == "|")
  76     {
  77       return thin;
  78     }
  79   else if (str == "|." || (h == 0 && str == ":|"))
  80     {
  81       m.add_at_edge (X_AXIS, LEFT, thick, 0);
  82       m.add_at_edge (X_AXIS, LEFT, thin, kern);
  83     }
  84   else if (str == ".|" || (h == 0 && str == "|:"))
  85     {
  86       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
  87       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
  88     }
  89   else if (str == ":|")
  90     {
  91       m.add_at_edge (X_AXIS, LEFT, thick, 0);
  92       m.add_at_edge (X_AXIS, LEFT, thin, kern);
  93       m.add_at_edge (X_AXIS, LEFT, colon, kern);
  94     }
  95   else if (str == "|:")
  96     {
  97       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
  98       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
  99       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 100     }
 101   else if (str == ":|:")
 102     {
 103       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 104       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 105       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 106       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 107     }
 108   else if (str == ".|.")
 109     {
 110       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 111       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 112     }
 113   else if (str == "||")
 114     {
 115       m.add_at_edge (X_AXIS, RIGHT, thin, 0);
 116       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern);
 117     }
 118
 119   return m;
 120 }
 121
 122
 123 Molecule
 124 Bar::simple_barline (Grob*,Real w, Real h)
 125 {
 126   return Lookup::filledbox (Box (Interval (0,w), Interval (-h/2, h/2)));
 127 }
 128
 129 MAKE_SCHEME_CALLBACK (Bar,before_line_breaking ,1);
 130
 131 SCM
 132 Bar::before_line_breaking (SCM smob)
 133 {
 134   Grob*me=unsmob_grob (smob);
 135   Item * item = dynamic_cast<Item*> (me);
 136
 137   SCM g = me->get_grob_property ("glyph");
 138   SCM orig = g;
 139   Direction bsd = item->break_status_dir ();
 140   if (gh_string_p (g) && bsd)
 141     {
 142       SCM proc = me->get_grob_property ("break-glyph-function");
 143       g = gh_call2 (proc, g, gh_int2scm (bsd));
 144     }
 145
 146
 147   if (!gh_string_p (g))
 148     {
 149       me->set_grob_property ("molecule-callback", SCM_BOOL_T);
 150       me->set_extent_callback (SCM_EOL, X_AXIS);
 151       // leave y_extent for spanbar?
 152     }
 153
 154   if (! gh_equal_p (g, orig))
 155     me->set_grob_property ("glyph", g);
 156
 157
 158   /*
 159     set a (pseudo) stem-direction, so we extra space is inserted
 160     between stemup and barline.
 161
 162     TODO: should check if the barline is the leftmost object of the
 163     break alignment.
 164
 165   */
 166   if (gh_string_p (g))
 167     {
 168       Grob * col = item->column_l ();
 169       SCM dirlist = col->get_grob_property ("dir-list");
 170       SCM scmdir = gh_int2scm (-1);
 171       if (scm_memq (scmdir, dirlist) == SCM_BOOL_F)
 172         {
 173           dirlist = gh_cons (scmdir, dirlist);
 174           col->set_grob_property ("dir-list", dirlist);
 175         }
 176     }
 177
 178   return SCM_UNSPECIFIED;
 179 }
 180
 181 void
 182 Bar::set_interface (Grob*me)
 183 {
 184   me->set_interface (ly_symbol2scm ("bar-line-interface"));
 185 }
 186
 187 bool
 188 Bar::has_interface (Grob*m)
 189 {
 190   return m && m->has_interface (ly_symbol2scm ("bar-line-interface"));
 191 }
 192
 193
 194 MAKE_SCHEME_CALLBACK (Bar,get_staff_bar_size,1);
 195 SCM
 196 Bar::get_staff_bar_size (SCM smob)
 197 {
 198   Grob*me = unsmob_grob (smob);
 199   Real ss = Staff_symbol_referencer::staff_space (me);
 200   SCM size = me->get_grob_property ("bar-size");
 201   if (gh_number_p (size))
 202     return gh_double2scm (gh_scm2double (size)*ss);
 203   else if (Staff_symbol_referencer::staff_symbol_l (me))
 204     {
 205       /*
 206         If there is no staff-symbol, we get -1 from the next
 207         calculation. That's a nonsense value, which would collapse the
 208         barline so we return 0.0 in the next alternative.
 209       */
 210       return gh_double2scm ((Staff_symbol_referencer::line_count (me) -1) * ss);
 211     }
 212   else
 213     return gh_int2scm (0);
 214 }