lily/bar-line.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "bar-line.hh"
  21
  22 #include "all-font-metrics.hh"
  23 #include "font-interface.hh"
  24 #include "lookup.hh"
  25 #include "output-def.hh"
  26 #include "paper-column.hh"
  27 #include "staff-symbol-referencer.hh"
  28 #include "line-interface.hh"
  29
  30 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_extent, 1)
  31 SCM
  32 Bar_line::calc_bar_extent (SCM smob)
  33 {
  34   Grob *me = unsmob_grob (smob);
  35
  36   SCM size = me->get_property ("bar-size");
  37
  38   if (!scm_is_number (size)
  39       || !Staff_symbol_referencer::get_staff_symbol (me))
  40     return ly_interval2scm (Interval ());
  41
  42   Real h = scm_to_double (size);
  43   return ly_interval2scm (Interval (-h/2, h/2));
  44 }
  45
  46 Interval
  47 Bar_line::bar_y_extent (Grob *me, Grob *refpoint)
  48 {
  49   Interval iv = robust_scm2interval (me->get_property ("bar-extent"), Interval ());
  50
  51   iv.translate (me->relative_coordinate (refpoint, Y_AXIS));
  52   return iv;
  53 }
  54
  55 MAKE_SCHEME_CALLBACK (Bar_line, print, 1);
  56 SCM
  57 Bar_line::print (SCM smob)
  58 {
  59   Grob *me = unsmob_grob (smob);
  60
  61   SCM s = me->get_property ("glyph-name");
  62   SCM barsize = me->get_property ("bar-size");
  63
  64   if (scm_is_string (s) && scm_is_number (barsize))
  65     {
  66       string str = ly_scm2string (s);
  67       Real sz = robust_scm2double (barsize, 0);
  68       if (sz <= 0)
  69         return SCM_EOL;
  70
  71       return compound_barline (me, str, sz, false).smobbed_copy ();
  72     }
  73   return SCM_EOL;
  74 }
  75
  76 Stencil
  77 Bar_line::compound_barline (Grob *me, string str, Real h,
  78                             bool rounded)
  79 {
  80   Real kern = robust_scm2double (me->get_property ("kern"), 1);
  81   Real thinkern = robust_scm2double (me->get_property ("thin-kern"), 1);
  82   Real hair = robust_scm2double (me->get_property ("hair-thickness"), 1);
  83   Real fatline = robust_scm2double (me->get_property ("thick-thickness"), 1);
  84
  85   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  86   Real staff_space = Staff_symbol_referencer::staff_space (me);
  87
  88   kern *= staffline;
  89   thinkern *= staffline;
  90   hair *= staffline;
  91   fatline *= staffline;
  92
  93   Stencil thin = simple_barline (me, hair, h, rounded);
  94   Stencil thick = simple_barline (me, fatline, h, rounded);
  95   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
  96
  97   int lines = Staff_symbol_referencer::line_count (me);
  98   Real dist
  99     = ((lines & 1 || lines == 0)
 100        ? 1
 101        : (staff_space < 2 ? 2 : .5)) * staff_space;
 102   Stencil colon (dot);
 103   colon.translate_axis (dist, Y_AXIS);
 104   colon.add_stencil (dot);
 105   colon.translate_axis (-dist / 2, Y_AXIS);
 106
 107   Stencil m;
 108   Grob *staff = Staff_symbol_referencer::get_staff_symbol (me);
 109   Real center = 0;
 110   if (staff)
 111     {
 112       Interval staff_extent = staff->extent (staff, Y_AXIS);
 113       center = staff_extent.center ();
 114     }
 115
 116   if (str == "||:")
 117     str = "|:";
 118
 119   if (str == "")
 120     {
 121       Stencil empty =  Lookup::blank (Box (Interval (0, 0), Interval (-h / 2, h / 2)));
 122       empty.translate_axis (center, Y_AXIS);
 123       return empty;
 124     }
 125   else if (str == "|")
 126     {
 127       thin.translate_axis (center, Y_AXIS);
 128       return thin;
 129     }
 130   else if (str == ".")
 131     {
 132       thick.translate_axis (center, Y_AXIS);
 133       return thick;
 134     }
 135   else if (str == "|." || (h == 0 && str == ":|"))
 136     {
 137       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 138       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 139     }
 140   else if (str == ".|" || (h == 0 && str == "|:"))
 141     {
 142       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 143       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 144     }
 145   else if (str == ":|")
 146     {
 147       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 148       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 149       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 150     }
 151   else if (str == "|:")
 152     {
 153       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 154       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 155       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 156     }
 157   else if (str == ":|:")
 158     {
 159       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 160       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 161       m.add_at_edge (X_AXIS, RIGHT, thick, 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, 0);
 167       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 168       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 169       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 170       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 171
 172     }
 173   else if (str == ":|.:")
 174     {
 175       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 176       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 177       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 178       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 179     }
 180   else if (str == ".|.")
 181     {
 182       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 183       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 184     }
 185   else if (str == "|.|")
 186     {
 187       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 188       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 189       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 190     }
 191   else if (str == "||")
 192     {
 193       /*
 194         should align to other side? this never appears
 195         on the system-start?
 196       */
 197       m.add_at_edge (X_AXIS, RIGHT, thin, 0);
 198       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern);
 199     }
 200   else if (str == ":")
 201     {
 202       int c = (Staff_symbol_referencer::line_count (me));
 203
 204       for (int i = 0; i < c - 1; i++)
 205         {
 206           Real y = (- (c - 1.0) / 2 + 0.5 + i) * staff_space;
 207           Stencil d (dot);
 208
 209           d.translate_axis (y, Y_AXIS);
 210           m.add_stencil (d);
 211         }
 212     }
 213   else if (str == "dashed")
 214     {
 215       m = dashed_bar_line (me, h, hair);
 216     }
 217   else if (str == "'")
 218     {
 219       m = tick_bar_line (me, h, rounded);
 220     }
 221
 222   m.translate_axis (center, Y_AXIS);
 223   return m;
 224 }
 225
 226 Stencil
 227 Bar_line::simple_barline (Grob *me,
 228                           Real w,
 229                           Real h,
 230                           bool rounded)
 231 {
 232   Real blot
 233     = rounded
 234     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 235     : 0.0;
 236
 237   return Lookup::round_filled_box (Box (Interval (0, w),
 238                                         Interval (-h / 2, h / 2)), blot);
 239 }
 240
 241 Stencil
 242 Bar_line::tick_bar_line (Grob *me, Real h, bool rounded)
 243 {
 244   Real th = Staff_symbol_referencer::staff_space (me) / 2;
 245   Real line_thick = Staff_symbol_referencer::line_thickness (me);
 246
 247   Real blot
 248     = rounded
 249     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 250     : 0.0;
 251
 252   return Lookup::round_filled_box (Box (Interval (0, line_thick),
 253                                         Interval (h / 2 - th, h / 2 + th)), blot);
 254 }
 255
 256
 257 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_size, 1);
 258 SCM
 259 Bar_line::calc_bar_size (SCM smob)
 260 {
 261   Grob *me = unsmob_grob (smob);
 262   if (Grob *staff = Staff_symbol_referencer::get_staff_symbol (me))
 263     {
 264       Interval staff_y = staff->extent (staff, Y_AXIS);
 265       return scm_from_double (staff_y.is_empty () ? 0.0 : staff_y.length ());
 266     }
 267   return scm_from_int (0);
 268 }
 269
 270
 271 Stencil
 272 Bar_line::dashed_bar_line (Grob *me, Real h, Real thick)
 273 {
 274   Real dash_size
 275     = 1.0 - robust_scm2double (me->get_property ("gap"), 0.3);
 276   /*
 277     this is a tad complex for what we want to achieve, but with a
 278     simple line, the round blotting interferes with staff line
 279     connections.
 280       */
 281   Real ss = Staff_symbol_referencer::staff_space (me);
 282   int count = Staff_symbol_referencer::line_count (me);
 283       Real line_thick = Staff_symbol_referencer::line_thickness (me);
 284
 285   if (fabs (line_thick + (count -1) * ss - h) <   0.1) // ugh.
 286     {
 287       Real blot =
 288         me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
 289
 290       Real half_space = ss/2;
 291       Stencil bar;
 292
 293       for (int i = (count-1); i >= -(count-1); i -= 2)
 294         {
 295           Real top_y = min ((i + dash_size) * half_space,
 296                             (count-1) * half_space +  line_thick / 2);
 297           Real bot_y = max ((i - dash_size) * half_space,
 298                             -(count-1) * half_space - line_thick/2);
 299
 300           bar.add_stencil (Lookup::round_filled_box (Box (Interval (0, thick),
 301                                                           Interval (bot_y, top_y)),
 302                                                      blot));
 303         }
 304       return bar;
 305     }
 306   else
 307     {
 308       /*
 309         We have to scale the dashing so it starts and ends with half a
 310         dash exactly.
 311        */
 312       int dashes = int (rint (h / ss));
 313       Real total_dash_size = h / dashes;
 314       Real factor = (dash_size - thick) / ss;
 315
 316       SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
 317                            scm_from_double (thick),
 318                            scm_from_double (factor * total_dash_size),
 319                            scm_from_double ((1-factor) * total_dash_size),
 320                            scm_from_double (0),
 321                            scm_from_double (h),
 322                            scm_from_double (factor * total_dash_size * 0.5),
 323                            SCM_UNDEFINED);
 324
 325       Box box;
 326       box.add_point (Offset (0, 0));
 327       box.add_point (Offset (0, h));
 328
 329       Stencil s (box, at);
 330       s.translate (Offset (thick/2, -h/2));
 331       return s;
 332     }
 333   return Stencil ();
 334 }
 335
 336 MAKE_SCHEME_CALLBACK (Bar_line, calc_anchor, 1)
 337 SCM
 338 Bar_line::calc_anchor (SCM smob)
 339 {
 340   Grob *me = unsmob_grob (smob);
 341   Real kern = robust_scm2double (me->get_property ("kern"), 1);
 342   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 343   string str = robust_scm2string (me->get_property ("glyph-name"), "");
 344
 345   /* we put the anchor in the center of the barline, unless we are
 346      a repeat bar, in which case we put the anchor in the center of
 347      the barline without the dots. */
 348   Interval ext = me->extent (me, X_AXIS);
 349   if (ext.is_empty ())
 350     return scm_from_double (0);
 351
 352   Real anchor = ext.center ();
 353
 354   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
 355   Real dot_width = dot.extent (X_AXIS).length () + kern * staffline;
 356   if (str == "|:")
 357     anchor -= dot_width / 2;
 358   else if (str == ":|")
 359     anchor += dot_width / 2;
 360
 361   return scm_from_double (anchor);
 362 }
 363
 364 ADD_INTERFACE (Bar_line,
 365                "Bar line.\n"
 366                "\n"
 367                "Print a special bar symbol.  It replaces the regular bar"
 368                " symbol with a special symbol.  The argument @var{bartype}"
 369                " is a string which specifies the kind of bar line to print."
 370                "  Options are @code{|}, @code{:|}, @code{|:}, @code{:|:}, @code{:|.|:},"
 371                " @code{:|.:}, @code{.}, @code{||}, @code{|.}, @code{.|}, @code{.|.},"
 372                " @code{|.|}, @code{:}, @code{dashed} and @code{'}.\n"
 373                "\n"
 374                "These produce, respectively, a normal bar line, a right repeat, a left repeat,"
 375                " a thick double repeat, a thin-thick-thin double repeat,"
 376                " a thin-thick double repeat, a thick bar, a double bar, a start bar,"
 377                " an end bar, a thick double bar, a thin-thick-thin bar,"
 378                " a dotted bar, a dashed bar, and a tick."
 379                "  In addition, there is an option"
 380                " @code{||:} which is equivalent to @code{|:} except at line"
 381                " breaks, where it produces a double bar (@code{||}) at the"
 382                " end of the line and a repeat sign (@code{|:}) at the"
 383                " beginning of the new line.\n"
 384                "\n"
 385                "If @var{bartype} is set to @code{empty} then nothing is"
 386                " printed, but a line break is allowed at that spot.\n"
 387                "\n"
 388                "@code{gap} is used for the gaps in dashed bar lines.",
 389
 390                /* properties */
 391                "allow-span-bar "
 392                "gap "
 393                "kern "
 394                "thin-kern "
 395                "hair-thickness "
 396                "thick-thickness "
 397                "glyph "
 398                "glyph-name "
 399                "bar-size "
 400                "bar-extent "
 401                );