lily/bar-line.cc

   1 /*
   2   bar.cc -- implement Bar
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 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 "stencil.hh"
  17 #include "output-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,print,1);
  25
  26 SCM
  27 Bar_line::print (SCM smob)
  28 {
  29   Grob * me = unsmob_grob (smob);
  30
  31   SCM s = me->get_property ("glyph");
  32   SCM barsiz_proc = me->get_property ("bar-size-procedure");
  33   if (ly_c_string_p (s) && ly_c_procedure_p (barsiz_proc))
  34     {
  35       String str  =ly_scm2string (s);
  36       SCM siz = scm_call_1 (barsiz_proc, me->self_scm ());
  37       Real sz = robust_scm2double (siz, 0);
  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 Stencil
  48 Bar_line::compound_barline (Grob*me, String str, Real h)
  49 {
  50   Real kern = robust_scm2double (me->get_property ("kern"), 1);
  51   Real thinkern = robust_scm2double (me->get_property ("thin-kern"), 1);
  52   Real hair = robust_scm2double (me->get_property ("hair-thickness"), 1);
  53   Real fatline = robust_scm2double (me->get_property ("thick-thickness"), 1);
  54
  55   Real staffline = me->get_paper ()->get_dimension (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   Stencil thin = simple_barline (me, hair, h);
  64   Stencil thick = simple_barline (me, fatline, h);
  65   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots-dot");
  66   Real dist = ( Staff_symbol_referencer::line_count (me) & 1 ? 1 :
  67                 (staff_space<2 ? 2 : .5) ) * staff_space;
  68   Stencil colon (dot);
  69   colon.translate_axis (dist,Y_AXIS);
  70   colon.add_stencil (dot);
  71   colon.translate_axis (-dist/2,Y_AXIS);
  72
  73   Stencil m;
  74
  75   if (str == "")
  76     {
  77       return Lookup::blank (Box (Interval (0, 0), Interval (-h/2, h/2)));
  78     }
  79   else if (str == "|")
  80     {
  81       return thin;
  82     }
  83   else if (str == "|." || (h == 0 && str == ":|"))
  84     {
  85       m.add_at_edge (X_AXIS, LEFT, thick, 0, 0);
  86       m.add_at_edge (X_AXIS, LEFT, thin, kern,0 );
  87     }
  88   else if (str == ".|" || (h == 0 && str == "|:"))
  89     {
  90       m.add_at_edge (X_AXIS, RIGHT, thick, 0, 0);
  91       m.add_at_edge (X_AXIS, RIGHT, thin, kern, 0);
  92     }
  93   else if (str == ":|")
  94     {
  95       m.add_at_edge (X_AXIS, LEFT, thick, 0, 0);
  96       m.add_at_edge (X_AXIS, LEFT, thin, kern, 0);
  97       m.add_at_edge (X_AXIS, LEFT, colon, kern, 0);
  98     }
  99   else if (str == "|:")
 100     {
 101       m.add_at_edge (X_AXIS, RIGHT, thick, 0, 0);
 102       m.add_at_edge (X_AXIS, RIGHT, thin, kern, 0);
 103       m.add_at_edge (X_AXIS, RIGHT, colon, kern, 0);
 104     }
 105   else if (str == ":|:")
 106     {
 107       m.add_at_edge (X_AXIS, LEFT, thick, thinkern, 0);
 108       m.add_at_edge (X_AXIS, LEFT, colon, kern, 0);
 109       m.add_at_edge (X_AXIS, RIGHT, thick, kern, 0);
 110       m.add_at_edge (X_AXIS, RIGHT, colon, kern, 0);
 111     }
 112   else if (str == ".|.")
 113     {
 114       m.add_at_edge (X_AXIS, LEFT, thick, thinkern, 0);
 115       m.add_at_edge (X_AXIS, RIGHT, thick, kern, 0);
 116     }
 117   else if (str == "||")
 118     {
 119       /*
 120         should align to other side? this never appears
 121         on the system-start?
 122       */
 123       m.add_at_edge (X_AXIS, RIGHT, thin, 0, 0);
 124       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern, 0);
 125     }
 126   else if (str == ":")
 127     {
 128       int c = (Staff_symbol_referencer::line_count (me));
 129
 130       for (int i = 0 ; i < c - 1; i++)
 131         {
 132           Real y = (- (c-1.0) / 2 + 0.5  +   i * staff_space);
 133           Stencil d (dot);
 134
 135           d. translate_axis (y,Y_AXIS);
 136           m.add_stencil (d);
 137         }
 138     }
 139   return m;
 140 }
 141
 142 Stencil
 143 Bar_line::simple_barline (Grob *me,Real w, Real h)
 144 {
 145   Real blot = me->get_paper ()->get_dimension (ly_symbol2scm ("blotdiameter"));
 146   return Lookup::round_filled_box (Box (Interval (0,w), Interval (-h/2, h/2)), blot);
 147 }
 148
 149 MAKE_SCHEME_CALLBACK (Bar_line,before_line_breaking ,1);
 150
 151 SCM
 152 Bar_line::before_line_breaking (SCM smob)
 153 {
 154   Grob*me=unsmob_grob (smob);
 155   Item * item = dynamic_cast<Item*> (me);
 156
 157   SCM g = me->get_property ("glyph");
 158   SCM orig = g;
 159   Direction bsd = item->break_status_dir ();
 160   if (ly_c_string_p (g) && bsd)
 161     {
 162       SCM proc = me->get_property ("break-glyph-function");
 163       g = scm_call_2 (proc, g, scm_int2num (bsd));
 164     }
 165
 166   if (!ly_c_string_p (g))
 167     {
 168       me->set_property ("print-function", SCM_EOL);
 169       me->set_extent (SCM_EOL, X_AXIS);
 170       // leave y_extent for spanbar?
 171     }
 172
 173   if (! ly_c_equal_p (g, orig))
 174     me->set_property ("glyph", g);
 175
 176   return SCM_UNSPECIFIED;
 177 }
 178
 179
 180
 181
 182 MAKE_SCHEME_CALLBACK (Bar_line,get_staff_bar_size,1);
 183 SCM
 184 Bar_line::get_staff_bar_size (SCM smob)
 185 {
 186   Grob*me = unsmob_grob (smob);
 187   Real ss = Staff_symbol_referencer::staff_space (me);
 188   SCM size = me->get_property ("bar-size");
 189   if (ly_c_number_p (size))
 190     return scm_make_real (ly_scm2double (size)*ss);
 191   else if (Staff_symbol_referencer::get_staff_symbol (me))
 192     {
 193       /*
 194         If there is no staff-symbol, we get -1 from the next
 195         calculation. That's a nonsense value, which would collapse the
 196         barline so we return 0.0 in the next alternative.
 197       */
 198       return scm_make_real ((Staff_symbol_referencer::line_count (me) -1) * ss);
 199     }
 200   else
 201     return scm_int2num (0);
 202 }
 203
 204
 205
 206 ADD_INTERFACE (Bar_line, "bar-line-interface",
 207   "Bar line.\n"
 208 "\n"
 209 "Print a special bar symbol. It replaces the \n"
 210 "regular bar symbol with a special\n"
 211 "symbol.  The argument @var{bartype} is a string which specifies the\n"
 212 "kind of bar to print.  Options are @code{:|},\n"
 213 "@code{|:}, @code{:|:},\n"
 214 "@code{||}, @code{|.},\n"
 215 "@code{.|}, and @code{.|.}. \n"
 216 "\n"
 217 "These produce, respectively, a right repeat, a left repeat, a double\n"
 218 "repeat, a double bar, a start bar, an end bar, and a thick double bar.\n"
 219 "If @var{bartype} is set to @code{empty} then nothing is printed,\n"
 220 "but a line break is allowed at that spot.\n",
 221   "bar-size-procedure kern thin-kern hair-thickness thick-thickness glyph bar-size break-glyph-function");