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   if (str == "||:")
  98     str = "|:";
  99
 100   if (str == "")
 101     return Lookup::blank (Box (Interval (0, 0), Interval (-h / 2, h / 2)));
 102   else if (str == "|")
 103     return thin;
 104   else if (str == "|." || (h == 0 && str == ":|"))
 105     {
 106       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 107       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 108     }
 109   else if (str == ".|" || (h == 0 && str == "|:"))
 110     {
 111       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 112       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 113     }
 114   else if (str == ":|")
 115     {
 116       m.add_at_edge (X_AXIS, LEFT, thick, 0);
 117       m.add_at_edge (X_AXIS, LEFT, thin, kern);
 118       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 119     }
 120   else if (str == "|:")
 121     {
 122       m.add_at_edge (X_AXIS, RIGHT, thick, 0);
 123       m.add_at_edge (X_AXIS, RIGHT, thin, kern);
 124       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 125     }
 126   else if (str == ":|:")
 127     {
 128       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 129       m.add_at_edge (X_AXIS, LEFT, colon, kern);
 130       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 131       m.add_at_edge (X_AXIS, RIGHT, colon, kern);
 132     }
 133   else if (str == ".|.")
 134     {
 135       m.add_at_edge (X_AXIS, LEFT, thick, thinkern);
 136       m.add_at_edge (X_AXIS, RIGHT, thick, kern);
 137     }
 138   else if (str == "||")
 139     {
 140       /*
 141         should align to other side? this never appears
 142         on the system-start?
 143       */
 144       m.add_at_edge (X_AXIS, RIGHT, thin, 0);
 145       m.add_at_edge (X_AXIS, RIGHT, thin, thinkern);
 146     }
 147   else if (str == ":")
 148     {
 149       int c = (Staff_symbol_referencer::line_count (me));
 150
 151       for (int i = 0; i < c - 1; i++)
 152         {
 153           Real y = (- (c - 1.0) / 2 + 0.5 + i) * staff_space;
 154           Stencil d (dot);
 155
 156           d.translate_axis (y, Y_AXIS);
 157           m.add_stencil (d);
 158         }
 159     }
 160   else if (str == "dashed")
 161     {
 162       m = dashed_bar_line (me, h, hair);
 163     }
 164   else if (str == ".")
 165     {
 166       m = dot;
 167     }
 168   return m;
 169 }
 170
 171 Stencil
 172 Bar_line::simple_barline (Grob *me,
 173                           Real w,
 174                           Real h,
 175                           bool rounded)
 176 {
 177   Real blot
 178     = rounded
 179     ? me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"))
 180     : 0.0;
 181
 182   return Lookup::round_filled_box (Box (Interval (0, w),
 183                                         Interval (-h / 2, h / 2)), blot);
 184 }
 185
 186 MAKE_SCHEME_CALLBACK (Bar_line, calc_bar_size, 1);
 187 SCM
 188 Bar_line::calc_bar_size (SCM smob)
 189 {
 190   Grob *me = unsmob_grob (smob);
 191   if (Grob *staff = Staff_symbol_referencer::get_staff_symbol (me))
 192     {
 193       Interval staff_y = staff->extent (staff, Y_AXIS);
 194       return scm_from_double (staff_y.is_empty () ? 0.0 : staff_y.length ());
 195     }
 196   return scm_from_int (0);
 197 }
 198
 199
 200 Stencil
 201 Bar_line::dashed_bar_line (Grob *me, Real h, Real thick)
 202 {
 203   Real dash_size
 204     = 1.0 - robust_scm2double (me->get_property ("gap"), 0.3);
 205   /*
 206     this is a tad complex for what we want to achieve, but with a
 207     simple line, the round blotting interferes with staff line
 208     connections.
 209       */
 210   Real ss = Staff_symbol_referencer::staff_space (me);
 211   int count = Staff_symbol_referencer::line_count (me);
 212       Real line_thick = Staff_symbol_referencer::line_thickness (me);
 213
 214   if (fabs (line_thick + (count -1) * ss - h) <   0.1) // ugh.
 215     {
 216       Real blot =
 217         me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
 218
 219       Real half_space = ss/2;
 220       Stencil bar;
 221
 222       for (int i = (count-1); i >= -(count-1); i -= 2)
 223         {
 224           Real top_y = min ((i + dash_size) * half_space,
 225                             (count-1) * half_space +  line_thick / 2);
 226           Real bot_y = max ((i - dash_size) * half_space,
 227                             -(count-1) * half_space - line_thick/2);
 228
 229           bar.add_stencil (Lookup::round_filled_box (Box (Interval (0, thick),
 230                                                           Interval (bot_y, top_y)),
 231                                                      blot));
 232         }
 233       return bar;
 234     }
 235   else
 236     {
 237       /*
 238         We have to scale the dashing so it starts and ends with half a
 239         dash exactly.
 240        */
 241       int dashes = int (rint (h / ss));
 242       Real total_dash_size = h / dashes;
 243       Real factor = (dash_size - thick) / ss;
 244
 245       SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
 246                            scm_from_double (thick),
 247                            scm_from_double (factor * total_dash_size),
 248                            scm_from_double ((1-factor) * total_dash_size),
 249                            scm_from_double (0),
 250                            scm_from_double (h),
 251                            scm_from_double (factor * total_dash_size * 0.5),
 252                            SCM_UNDEFINED);
 253
 254       Box box;
 255       box.add_point (Offset (0, 0));
 256       box.add_point (Offset (0, h));
 257
 258       Stencil s (box, at);
 259       s.translate (Offset (thick/2, -h/2));
 260       return s;
 261     }
 262   return Stencil ();
 263 }
 264
 265 MAKE_SCHEME_CALLBACK (Bar_line, calc_anchor, 1)
 266 SCM
 267 Bar_line::calc_anchor (SCM smob)
 268 {
 269   Grob *me = unsmob_grob (smob);
 270   Real kern = robust_scm2double (me->get_property ("kern"), 1);
 271   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 272   string str = robust_scm2string (me->get_property ("glyph-name"), "");
 273
 274   /* we put the anchor in the center of the barline, unless we are
 275      a repeat bar, in which case we put the anchor in the center of
 276      the barline without the dots. */
 277   Interval ext = me->extent (me, X_AXIS);
 278   if (ext.is_empty ())
 279     return scm_from_double (0);
 280
 281   Real anchor = ext.center ();
 282
 283   Stencil dot = Font_interface::get_default_font (me)->find_by_name ("dots.dot");
 284   Real dot_width = dot.extent (X_AXIS).length () + kern * staffline;
 285   if (str == "|:")
 286     anchor -= dot_width / 2;
 287   else if (str == ":|")
 288     anchor += dot_width / 2;
 289
 290   return scm_from_double (anchor);
 291 }
 292
 293 ADD_INTERFACE (Bar_line,
 294                "Bar line.\n"
 295                "\n"
 296                "Print a special bar symbol.  It replaces the regular bar"
 297                " symbol with a special symbol.  The argument @var{bartype}"
 298                " is a string which specifies the kind of bar to print."
 299                "  Options are @code{:|}, @code{|:}, @code{:|:}, @code{||},"
 300                " @code{|.}, @code{.|}, and @code{.|.}.\n"
 301                "\n"
 302                "These produce, respectively, a right repeat, a left repeat,"
 303                " a double repeat, a double bar, a start bar, an end bar, and"
 304                " a thick double bar.  In addition, there is an option"
 305                " @code{||:} which is equivalent to @code{|:} except at line"
 306                " breaks, where it produces a double bar (@code{||}) at the"
 307                " end of the line and a repeat sign (@code{|:}) at the"
 308                " beginning of the new line.\n"
 309                "\n"
 310                "If @var{bartype} is set to @code{empty} then nothing is"
 311                " printed, but a line break is allowed at that spot.\n"
 312                "\n"
 313                "@code{gap} is used for the gaps in dashed barlines.",
 314
 315                /* properties */
 316                "allow-span-bar "
 317                "gap "
 318                "kern "
 319                "thin-kern "
 320                "hair-thickness "
 321                "thick-thickness "
 322                "glyph "
 323                "glyph-name "
 324                "bar-size "
 325                "bar-extent "
 326                );
 327
 328