lily/staff-symbol.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 "staff-symbol.hh"
  21
  22 #include "lookup.hh"
  23 #include "dimensions.hh"
  24 #include "output-def.hh"
  25 #include "warn.hh"
  26 #include "item.hh"
  27 #include "staff-symbol-referencer.hh"
  28 #include "spanner.hh"
  29
  30 MAKE_SCHEME_CALLBACK (Staff_symbol, print, 1);
  31
  32 SCM
  33 Staff_symbol::print (SCM smob)
  34 {
  35   Grob *me = unsmob_grob (smob);
  36   Spanner *sp = dynamic_cast<Spanner *> (me);
  37   Grob *common
  38     = sp->get_bound (LEFT)->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
  39
  40   Interval span_points (0, 0);
  41
  42   /*
  43     For raggedright without ragged staves, simply set width to the linewidth.
  44
  45     (ok -- lousy UI, since width is in staff spaces)
  46
  47     --hwn.
  48   */
  49   Real t = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  50   t *= robust_scm2double (me->get_property ("thickness"), 1.0);
  51
  52   Direction d = LEFT;
  53   do
  54     {
  55       SCM width_scm = me->get_property ("width");
  56       if (d == RIGHT && scm_is_number (width_scm))
  57         {
  58           /*
  59             don't multiply by Staff_symbol_referencer::staff_space (me),
  60             since that would make aligning staff symbols of different sizes to
  61             one right margin hell.
  62           */
  63           span_points[RIGHT] = scm_to_double (width_scm);
  64         }
  65       else
  66         {
  67           Item *x = sp->get_bound (d);
  68
  69           span_points[d] = x->relative_coordinate (common, X_AXIS);
  70           if (!x->break_status_dir ()
  71               && !x->extent (x, X_AXIS).is_empty ())
  72             span_points[d] += x->extent (x, X_AXIS)[d];
  73         }
  74
  75       span_points[d] -= d* t / 2;
  76     }
  77   while (flip (&d) != LEFT);
  78
  79   Stencil m;
  80
  81   SCM line_positions = me->get_property ("line-positions");
  82   Stencil line
  83     = Lookup::horizontal_line (span_points
  84                                -me->relative_coordinate (common, X_AXIS),
  85                                t);
  86
  87   Real space = staff_space (me);
  88   if (scm_is_pair (line_positions))
  89     {
  90       for (SCM s = line_positions; scm_is_pair (s);
  91            s = scm_cdr (s))
  92         {
  93           Stencil b (line);
  94           b.translate_axis (scm_to_double (scm_car (s))
  95                             * 0.5 * space, Y_AXIS);
  96           m.add_stencil (b);
  97         }
  98     }
  99   else
 100     {
 101       int l = Staff_symbol::line_count (me);
 102       Real height = (l - 1) * staff_space (me) / 2;
 103       for (int i = 0; i < l; i++)
 104         {
 105           Stencil b (line);
 106           b.translate_axis (height - i * space, Y_AXIS);
 107           m.add_stencil (b);
 108         }
 109     }
 110   return m.smobbed_copy ();
 111 }
 112
 113
 114 int
 115 Staff_symbol::get_steps (Grob *me)
 116 {
 117   return line_count (me) * 2;
 118 }
 119
 120 int
 121 Staff_symbol::line_count (Grob *me)
 122 {
 123   SCM c = me->get_property ("line-count");
 124   if (scm_is_number (c))
 125     return scm_to_int (c);
 126   else
 127     return 0;
 128 }
 129
 130 Real
 131 Staff_symbol::staff_space (Grob *me)
 132 {
 133   return robust_scm2double (me->get_property ("staff-space"), 1.0);
 134 }
 135
 136 Real
 137 Staff_symbol::get_line_thickness (Grob *me)
 138 {
 139   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 140
 141   return robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
 142 }
 143
 144 Real
 145 Staff_symbol::get_ledger_line_thickness (Grob *me)
 146 {
 147   SCM lt_pair = me->get_property ("ledger-line-thickness");
 148   Offset z = robust_scm2offset (lt_pair, Offset (1.0, 0.1));
 149
 150   return z[X_AXIS] * get_line_thickness (me) + z[Y_AXIS] * staff_space (me);
 151 }
 152
 153 MAKE_SCHEME_CALLBACK (Staff_symbol, height,1);
 154 SCM
 155 Staff_symbol::height  (SCM smob)
 156 {
 157   Grob *me = unsmob_grob (smob);
 158   Real t = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 159   t *= robust_scm2double (me->get_property ("thickness"), 1.0);
 160
 161   SCM line_positions = me->get_property ("line-positions");
 162
 163   Interval y_ext;
 164   Real space = staff_space (me);
 165   if (scm_is_pair (line_positions))
 166     {
 167       for (SCM s = line_positions; scm_is_pair (s);
 168            s = scm_cdr (s))
 169         y_ext.add_point (scm_to_double (scm_car (s)) * 0.5 * space);
 170     }
 171   else
 172     {
 173       int l = Staff_symbol::line_count (me);
 174       Real height = (l - 1) * staff_space (me) / 2;
 175       y_ext = Interval (-height, height);
 176     }
 177   y_ext.widen (t/2);
 178   return ly_interval2scm (y_ext);
 179 }
 180
 181 bool
 182 Staff_symbol::on_line (Grob *me, int pos)
 183 {
 184   SCM line_positions = me->get_property ("line-positions");
 185   if (scm_is_pair (line_positions))
 186     {
 187       Real min_line = HUGE_VAL;
 188       Real max_line = -HUGE_VAL;
 189       for (SCM s = line_positions; scm_is_pair (s); s = scm_cdr (s))
 190         {
 191           Real current_line = scm_to_double (scm_car (s));
 192           if (pos == current_line)
 193             return true;
 194           if (current_line > max_line)
 195             max_line = current_line;
 196           if (current_line < min_line)
 197             min_line = current_line;
 198
 199         }
 200       if (pos < min_line)
 201         return (( (int) (rint (pos - min_line)) % 2) == 0);
 202       if (pos > max_line)
 203         return (( (int) (rint (pos - max_line)) % 2) == 0);
 204
 205       return false;
 206     }
 207   else
 208     return ((abs (pos + line_count (me)) % 2) == 1);
 209 }
 210
 211 ADD_INTERFACE (Staff_symbol,
 212                "This spanner draws the lines of a staff.  A staff symbol"
 213                " defines a vertical unit, the @emph{staff space}.  Quantities"
 214                " that go by a half staff space are called @emph{positions}."
 215                "  The center (i.e., middle line or space) is position@tie{}0."
 216                " The length of the symbol may be set by hand through the"
 217                " @code{width} property.",
 218
 219                /* properties */
 220                "ledger-line-thickness "
 221                "line-count "
 222                "line-positions "
 223                "staff-space "
 224                "thickness "
 225                "width "
 226                );