lily/bar-line.cc

   1 /*
   2   bar-line.cc -- implement Bar_line
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "bar-line.hh"
  10
  11 #include "all-font-metrics.hh"
  12 #include "font-interface.hh"
  13 #include "lookup.hh"
  14 #include "output-def.hh"
  15 #include "paper-column.hh"
  16 #include "staff-symbol-referencer.hh"
  17 #include "line-interface.hh"
  18
  19 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_extent, 1)
  20 SCM
  21 Bar_line::calc_bar_extent (SCM smob)
  22 {
  23   Grob *me = unsmob_grob (smob);
  24
  25   SCM size = me->get_property ("bar-size");
  26
  27   if (!scm_is_number (size)
  28       || !Staff_symbol_referencer::get_staff_symbol (me))
  29     return ly_interval2scm (Interval ());
  30
  31   Real h = scm_to_double (size);
  32   return ly_interval2scm (Interval (-h/2, h/2));
  33 }
  34
  35 Interval
  36 Bar_line::bar_y_extent (Grob *me, Grob *refpoint)
  37 {
  38   Interval iv = robust_scm2interval (me->get_property ("bar-extent"), Interval ());
  39
  40   iv.translate (me->relative_coordinate (refpoint, Y_AXIS));
  41   return iv;
  42 }
  43
  44 MAKE_SCHEME_CALLBACK (Bar_line, print, 1);
  45 SCM
  46 Bar_line::print (SCM smob)
  47 {
  48   Grob *me = unsmob_grob (smob);
  49
  50   SCM s = me->get_property ("glyph-name");
  51   SCM barsize = me->get_property ("bar-size");
  52
  53   if (scm_is_string (s) && scm_is_number (barsize))
  54     {
  55       string str = ly_scm2string (s);
  56       Real sz = robust_scm2double (barsize, 0);
  57       if (sz <= 0)
  58         return SCM_EOL;
  59
  60       return compound_barline (me, str, sz, false).smobbed_copy ();
  61     }
  62   return SCM_EOL;
  63 }
  64
  65 Stencil
  66 Bar_line::compound_barline (Grob *me, string str, Real h,
  67                             bool rounded)
  68 {
  69   Real kern = robust_scm2double (me->get_property ("kern"), 1);
  70   Real thinkern = robust_scm2double (me->get_property ("thin-kern"), 1);
  71   Real hair = robust_scm2double (me->get_property ("hair-thickness"), 1);
  72   Real fatline = robust_scm2double (me->get_property ("thick-thickness"), 1);
  73
  74   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  75   Real staff_space = Staff_symbol_referencer::staff_space (me);
  76
  77   kern *= staffline;
  78   thinkern *= staffline;
  79   hair *= staffline;
  80   fatline *= staffline;
  81
  82   Stencil thin = simple_barline (me, hair, h, rounded);
  83   Stencil thick = simple_barline (me, fatline, h, rounded);
  84   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
  85
  86   int lines = Staff_symbol_referencer::line_count (me);
  87   Real dist
  88     = ((lines & 1 || lines == 0)
  89        ? 1
  90        : (staff_space < 2 ? 2 : .5)) * staff_space;
  91   Stencil colon (dot);
  92   colon.translate_axis (dist, Y_AXIS);
  93   colon.add_stencil (dot);
  94   colon.translate_axis (-dist / 2, Y_AXIS);
  95
  96   Stencil m;
  97   Grob *staff = Staff_symbol_referencer::get_staff_symbol (me);
  98   Real center = 0;
  99   if (staff)
 100     {
 101       Interval staff_extent = staff->extent (staff, Y_AXIS);
 102       center = staff_extent.center ();
 103     }
 104
 105   if (str == "||:")
 106     str = "|:";
 107
 108   if (str == "")
 109     {
 110       Stencil empty =  Lookup::blank (Box (Interval (0, 0), Interval (-h / 2, h / 2)));
 111       empty.translate_axis (center, Y_AXIS);
 112       return empty;
 113     }
 114   else if (str == "|")
 115     {
 116       thin.translate_axis (center, Y_AXIS);
 117       return thin;
 118     }
 119   else if (str == "|." || (h == 0 && str == ":|"))
 120     {
 121       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 122       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 123     }
 124   else if (str == ".|" || (h == 0 && str == "|:"))
 125     {
 126       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 127       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 128     }
 129   else if (str == ":|")
 130     {
 131       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 132       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 133       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 134     }
 135   else if (str == "|:")
 136     {
 137       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 138       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 139       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 140     }
 141   else if (str == ":|:")
 142     {
 143       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 144       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 145       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 146       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 147     }
 148   else if (str == ":|.|:")
 149     {
 150       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 151       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 152       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 153       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 154       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 155
 156     }
 157   else if (str == ":|.:")
 158     {
 159       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 160       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 161       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 162       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 163     }
 164   else if (str == ".|.")
 165     {
 166       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 167       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 168     }
 169   else if (str == "|.|")
 170     {
 171       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 172       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 173       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 174     }
 175   else if (str == "||")
 176     {
 177       /*
 178         should align to other side? this never appears
 179         on the system-start?
 180       */
 181       m.add_at_edge (X_AXIS, RIGHT, thin, 0);
 182       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern);
 183     }
 184   else if (str == ":")
 185     {
 186       int c = (Staff_symbol_referencer::line_count (me));
 187
 188       for (int i = 0; i < c - 1; i++)
 189         {
 190           Real y = (- (c - 1.0) / 2 + 0.5 + i) * staff_space;
 191           Stencil d (dot);
 192
 193           d.translate_axis (y, Y_AXIS);
 194           m.add_stencil (d);
 195         }
 196     }
 197   else if (str == "dashed")
 198     {
 199       m = dashed_bar_line (me, h, hair);
 200     }
 201   else if (str == "'")
 202     {
 203       m = tick_bar_line (me, h, rounded);
 204     }
 205   else if (str == ".")
 206     {
 207       m = dot;
 208     }
 209
 210   m.translate_axis (center, Y_AXIS);
 211   return m;
 212 }
 213
 214 Stencil
 215 Bar_line::simple_barline (Grob *me,
 216                           Real w,
 217                           Real h,
 218                           bool rounded)
 219 {
 220   Real blot
 221     = rounded
 222     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 223     : 0.0;
 224
 225   return Lookup::round_filled_box (Box (Interval (0, w),
 226                                         Interval (-h / 2, h / 2)), blot);
 227 }
 228
 229 Stencil
 230 Bar_line::tick_bar_line (Grob *me, Real h, bool rounded)
 231 {
 232   Real th = Staff_symbol_referencer::staff_space (me) / 2;
 233   Real line_thick = Staff_symbol_referencer::line_thickness (me);
 234
 235   Real blot
 236     = rounded
 237     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 238     : 0.0;
 239
 240   return Lookup::round_filled_box (Box (Interval (0, line_thick),
 241                                         Interval (h / 2 - th, h / 2 + th)), blot);
 242 }
 243
 244
 245 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_size, 1);
 246 SCM
 247 Bar_line::calc_bar_size (SCM smob)
 248 {
 249   Grob *me = unsmob_grob (smob);
 250   if (Grob *staff = Staff_symbol_referencer::get_staff_symbol (me))
 251     {
 252       Interval staff_y = staff->extent (staff, Y_AXIS);
 253       return scm_from_double (staff_y.is_empty () ? 0.0 : staff_y.length ());
 254     }
 255   return scm_from_int (0);
 256 }
 257
 258
 259 Stencil
 260 Bar_line::dashed_bar_line (Grob *me, Real h, Real thick)
 261 {
 262   Real dash_size
 263     = 1.0 - robust_scm2double (me->get_property ("gap"), 0.3);
 264   /*
 265     this is a tad complex for what we want to achieve, but with a
 266     simple line, the round blotting interferes with staff line
 267     connections.
 268       */
 269   Real ss = Staff_symbol_referencer::staff_space (me);
 270   int count = Staff_symbol_referencer::line_count (me);
 271       Real line_thick = Staff_symbol_referencer::line_thickness (me);
 272
 273   if (fabs (line_thick + (count -1) * ss - h) <   0.1) // ugh.
 274     {
 275       Real blot =
 276         me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
 277
 278       Real half_space = ss/2;
 279       Stencil bar;
 280
 281       for (int i = (count-1); i >= -(count-1); i -= 2)
 282         {
 283           Real top_y = min ((i + dash_size) * half_space,
 284                             (count-1) * half_space +  line_thick / 2);
 285           Real bot_y = max ((i - dash_size) * half_space,
 286                             -(count-1) * half_space - line_thick/2);
 287
 288           bar.add_stencil (Lookup::round_filled_box (Box (Interval (0, thick),
 289                                                           Interval (bot_y, top_y)),
 290                                                      blot));
 291         }
 292       return bar;
 293     }
 294   else
 295     {
 296       /*
 297         We have to scale the dashing so it starts and ends with half a
 298         dash exactly.
 299        */
 300       int dashes = int (rint (h / ss));
 301       Real total_dash_size = h / dashes;
 302       Real factor = (dash_size - thick) / ss;
 303
 304       SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
 305                            scm_from_double (thick),
 306                            scm_from_double (factor * total_dash_size),
 307                            scm_from_double ((1-factor) * total_dash_size),
 308                            scm_from_double (0),
 309                            scm_from_double (h),
 310                            scm_from_double (factor * total_dash_size * 0.5),
 311                            SCM_UNDEFINED);
 312
 313       Box box;
 314       box.add_point (Offset (0, 0));
 315       box.add_point (Offset (0, h));
 316
 317       Stencil s (box, at);
 318       s.translate (Offset (thick/2, -h/2));
 319       return s;
 320     }
 321   return Stencil ();
 322 }
 323
 324 MAKE_SCHEME_CALLBACK (Bar_line, calc_anchor, 1)
 325 SCM
 326 Bar_line::calc_anchor (SCM smob)
 327 {
 328   Grob *me = unsmob_grob (smob);
 329   Real kern = robust_scm2double (me->get_property ("kern"), 1);
 330   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 331   string str = robust_scm2string (me->get_property ("glyph-name"), "");
 332
 333   /* we put the anchor in the center of the barline, unless we are
 334      a repeat bar, in which case we put the anchor in the center of
 335      the barline without the dots. */
 336   Interval ext = me->extent (me, X_AXIS);
 337   if (ext.is_empty ())
 338     return scm_from_double (0);
 339
 340   Real anchor = ext.center ();
 341
 342   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
 343   Real dot_width = dot.extent (X_AXIS).length () + kern * staffline;
 344   if (str == "|:")
 345     anchor -= dot_width / 2;
 346   else if (str == ":|")
 347     anchor += dot_width / 2;
 348
 349   return scm_from_double (anchor);
 350 }
 351
 352 ADD_INTERFACE (Bar_line,
 353                "Bar line.\n"
 354                "\n"
 355                "Print a special bar symbol.  It replaces the regular bar"
 356                " symbol with a special symbol.  The argument @var{bartype}"
 357                " is a string which specifies the kind of bar line to print."
 358                "  Options are @code{:|}, @code{|:}, @code{:|:}, @code{:|.|:},"
 359                " @code{:|.:}, @code{||}, @code{|.}, @code{.|}, @code{.|.},"
 360                " @code{|.|}, @code{:} and @code{dashed}.\n"
 361                "\n"
 362                "These produce, respectively, a right repeat, a left repeat,"
 363                " a thick double repeat, a thin-thick-thin double repeat,"
 364                " a thin-thick double repeat, a double bar, a start bar,"
 365                " an end bar, a thick double bar, a thin-thick-thin bar,"
 366                " a dotted bar and a dashed bar."
 367                "  In addition, there is an option"
 368                " @code{||:} which is equivalent to @code{|:} except at line"
 369                " breaks, where it produces a double bar (@code{||}) at the"
 370                " end of the line and a repeat sign (@code{|:}) at the"
 371                " beginning of the new line.\n"
 372                "\n"
 373                "If @var{bartype} is set to @code{empty} then nothing is"
 374                " printed, but a line break is allowed at that spot.\n"
 375                "\n"
 376                "@code{gap} is used for the gaps in dashed bar lines.",
 377
 378                /* properties */
 379                "allow-span-bar "
 380                "gap "
 381                "kern "
 382                "thin-kern "
 383                "hair-thickness "
 384                "thick-thickness "
 385                "glyph "
 386                "glyph-name "
 387                "bar-size "
 388                "bar-extent "
 389                );