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--2007 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, thinkern);
 151       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 152     }
 153   else if (str == "||")
 154     {
 155       /*
 156         should align to other side? this never appears
 157         on the system-start?
 158       */
 159       m.add_at_edge (X_AXIS, RIGHT, thin, 0);
 160       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern);
 161     }
 162   else if (str == ":")
 163     {
 164       int c = (Staff_symbol_referencer::line_count (me));
 165
 166       for (int i = 0; i < c - 1; i++)
 167         {
 168           Real y = (- (c - 1.0) / 2 + 0.5 + i) * staff_space;
 169           Stencil d (dot);
 170
 171           d.translate_axis (y, Y_AXIS);
 172           m.add_stencil (d);
 173         }
 174     }
 175   else if (str == "dashed")
 176     {
 177       m = dashed_bar_line (me, h, hair);
 178     }
 179   else if (str == ".")
 180     {
 181       m = dot;
 182     }
 183
 184   m.translate_axis (center, Y_AXIS);
 185   return m;
 186 }
 187
 188 Stencil
 189 Bar_line::simple_barline (Grob *me,
 190                           Real w,
 191                           Real h,
 192                           bool rounded)
 193 {
 194   Real blot
 195     = rounded
 196     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 197     : 0.0;
 198
 199   return Lookup::round_filled_box (Box (Interval (0, w),
 200                                         Interval (-h / 2, h / 2)), blot);
 201 }
 202
 203 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_size, 1);
 204 SCM
 205 Bar_line::calc_bar_size (SCM smob)
 206 {
 207   Grob *me = unsmob_grob (smob);
 208   if (Grob *staff = Staff_symbol_referencer::get_staff_symbol (me))
 209     {
 210       Interval staff_y = staff->extent (staff, Y_AXIS);
 211       return scm_from_double (staff_y.is_empty () ? 0.0 : staff_y.length ());
 212     }
 213   return scm_from_int (0);
 214 }
 215
 216
 217 Stencil
 218 Bar_line::dashed_bar_line (Grob *me, Real h, Real thick)
 219 {
 220   Real dash_size
 221     = 1.0 - robust_scm2double (me->get_property ("gap"), 0.3);
 222   /*
 223     this is a tad complex for what we want to achieve, but with a
 224     simple line, the round blotting interferes with staff line
 225     connections.
 226       */
 227   Real ss = Staff_symbol_referencer::staff_space (me);
 228   int count = Staff_symbol_referencer::line_count (me);
 229       Real line_thick = Staff_symbol_referencer::line_thickness (me);
 230
 231   if (fabs (line_thick + (count -1) * ss - h) <   0.1) // ugh.
 232     {
 233       Real blot =
 234         me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
 235
 236       Real half_space = ss/2;
 237       Stencil bar;
 238
 239       for (int i = (count-1); i >= -(count-1); i -= 2)
 240         {
 241           Real top_y = min ((i + dash_size) * half_space,
 242                             (count-1) * half_space +  line_thick / 2);
 243           Real bot_y = max ((i - dash_size) * half_space,
 244                             -(count-1) * half_space - line_thick/2);
 245
 246           bar.add_stencil (Lookup::round_filled_box (Box (Interval (0, thick),
 247                                                           Interval (bot_y, top_y)),
 248                                                      blot));
 249         }
 250       return bar;
 251     }
 252   else
 253     {
 254       /*
 255         We have to scale the dashing so it starts and ends with half a
 256         dash exactly.
 257        */
 258       int dashes = int (rint (h / ss));
 259       Real total_dash_size = h / dashes;
 260       Real factor = (dash_size - thick) / ss;
 261
 262       SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
 263                            scm_from_double (thick),
 264                            scm_from_double (factor * total_dash_size),
 265                            scm_from_double ((1-factor) * total_dash_size),
 266                            scm_from_double (0),
 267                            scm_from_double (h),
 268                            scm_from_double (factor * total_dash_size * 0.5),
 269                            SCM_UNDEFINED);
 270
 271       Box box;
 272       box.add_point (Offset (0, 0));
 273       box.add_point (Offset (0, h));
 274
 275       Stencil s (box, at);
 276       s.translate (Offset (thick/2, -h/2));
 277       return s;
 278     }
 279   return Stencil ();
 280 }
 281
 282 MAKE_SCHEME_CALLBACK (Bar_line, calc_anchor, 1)
 283 SCM
 284 Bar_line::calc_anchor (SCM smob)
 285 {
 286   Grob *me = unsmob_grob (smob);
 287   Real kern = robust_scm2double (me->get_property ("kern"), 1);
 288   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 289   string str = robust_scm2string (me->get_property ("glyph-name"), "");
 290
 291   /* we put the anchor in the center of the barline, unless we are
 292      a repeat bar, in which case we put the anchor in the center of
 293      the barline without the dots. */
 294   Interval ext = me->extent (me, X_AXIS);
 295   if (ext.is_empty ())
 296     return scm_from_double (0);
 297
 298   Real anchor = ext.center ();
 299
 300   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
 301   Real dot_width = dot.extent (X_AXIS).length () + kern * staffline;
 302   if (str == "|:")
 303     anchor -= dot_width / 2;
 304   else if (str == ":|")
 305     anchor += dot_width / 2;
 306
 307   return scm_from_double (anchor);
 308 }
 309
 310 ADD_INTERFACE (Bar_line,
 311                "Bar line.\n"
 312                "\n"
 313                "Print a special bar symbol.  It replaces the regular bar"
 314                " symbol with a special symbol.  The argument @var{bartype}"
 315                " is a string which specifies the kind of bar to print."
 316                "  Options are @code{:|}, @code{|:}, @code{:|:}, @code{||},"
 317                " @code{|.}, @code{.|}, and @code{.|.}.\n"
 318                "\n"
 319                "These produce, respectively, a right repeat, a left repeat,"
 320                " a double repeat, a double bar, a start bar, an end bar, and"
 321                " a thick double bar.  In addition, there is an option"
 322                " @code{||:} which is equivalent to @code{|:} except at line"
 323                " breaks, where it produces a double bar (@code{||}) at the"
 324                " end of the line and a repeat sign (@code{|:}) at the"
 325                " beginning of the new line.\n"
 326                "\n"
 327                "If @var{bartype} is set to @code{empty} then nothing is"
 328                " printed, but a line break is allowed at that spot.\n"
 329                "\n"
 330                "@code{gap} is used for the gaps in dashed barlines.",
 331
 332                /* properties */
 333                "allow-span-bar "
 334                "gap "
 335                "kern "
 336                "thin-kern "
 337                "hair-thickness "
 338                "thick-thickness "
 339                "glyph "
 340                "glyph-name "
 341                "bar-size "
 342                "bar-extent "
 343                );
 344
 345