lily/text-spanner.cc

   1 /*
   2   text-spanner.cc -- implement Text_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2003 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   Revised over good by Han-Wen.
   9 */
  10
  11 #include "molecule.hh"
  12 #include "text-item.hh"
  13 #include "text-spanner.hh"
  14 #include "line-spanner.hh"
  15 #include "spanner.hh"
  16 #include "font-interface.hh"
  17 #include "dimensions.hh"
  18 #include "paper-def.hh"
  19 #include "warn.hh"
  20 #include "paper-column.hh"
  21 #include "staff-symbol-referencer.hh"
  22
  23 /*
  24   TODO:
  25   - vertical start / vertical end (fixme-name) |
  26   - contination types (vert. star, vert. end)  |-> eat volta-bracket
  27   - more styles
  28   - more texts/positions
  29 */
  30
  31 MAKE_SCHEME_CALLBACK (Text_spanner, brew_molecule, 1);
  32
  33 /*
  34   TODO: this function is too long
  35 */
  36 SCM
  37 Text_spanner::brew_molecule (SCM smob)
  38 {
  39   Grob *me= unsmob_grob (smob);
  40   Spanner *spanner = dynamic_cast<Spanner*> (me);
  41
  42   /* Ugh, must be same as Hairpin::brew_molecule.  */
  43   Real padding = 0.0;
  44   SCM itp= me->get_grob_property ("if-text-padding");
  45   if (gh_number_p (itp))
  46     padding = gh_scm2double (itp);
  47
  48   Grob *common = spanner->get_bound (LEFT)->common_refpoint (spanner->get_bound (RIGHT), X_AXIS);
  49
  50   Interval span_points;
  51   Drul_array<bool> broken;
  52   Direction d = LEFT;
  53   do
  54     {
  55       Item *b = spanner->get_bound (d);
  56       broken[d] = b->break_status_dir () != CENTER;
  57
  58       if (broken[d])
  59         {
  60         if (d == LEFT)
  61           span_points[d] = spanner->get_broken_left_end_align ();
  62         else
  63           span_points[d] = b->relative_coordinate (common, X_AXIS);
  64         }
  65       else
  66           {
  67             bool encl = to_boolean (me->get_grob_property ("enclose-bounds"));
  68             span_points[d] = b->extent (common, X_AXIS)[encl ? d : -d];
  69           }
  70     }
  71   while (flip (&d) != LEFT);
  72
  73
  74
  75   SCM properties = Font_interface::font_alist_chain (me);
  76   SCM edge_text = me->get_grob_property ("edge-text");
  77   Drul_array<Molecule> edge;
  78   if (gh_pair_p (edge_text))
  79     {
  80       Direction d = LEFT;
  81       do
  82         {
  83           /*  Don't repeat edge text for broken end */
  84           if (broken[d])
  85             continue;
  86
  87           SCM text = index_get_cell (edge_text, d);
  88
  89           if (Text_item::markup_p (text))
  90             edge[d] = *unsmob_molecule (Text_item::interpret_markup (smob, properties, text));
  91
  92           if (!edge[d].empty_b ())
  93             edge[d].align_to (Y_AXIS, CENTER);
  94         }
  95       while (flip (&d) != LEFT);
  96     }
  97
  98
  99   Drul_array<Real> shorten;
 100   shorten[LEFT] = 0;
 101   shorten[RIGHT] = 0;
 102
 103   SCM ew = me->get_grob_property ("bracket-flare");
 104   SCM s = me->get_grob_property ("shorten-pair");
 105   if (gh_pair_p (s))
 106     {
 107       span_points[LEFT] += gh_scm2double (ly_car (s));
 108       span_points[RIGHT] -= gh_scm2double (ly_cdr (s));
 109     }
 110   if (gh_pair_p (ew))
 111     {
 112       span_points[LEFT] += gh_scm2double (ly_car (ew));
 113       span_points[RIGHT] -= gh_scm2double (ly_cdr (ew));
 114     }
 115
 116   Real thick = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
 117   SCM st = me->get_grob_property ("thickness");
 118   if (gh_number_p (st))
 119     {
 120       thick *=  gh_scm2double (st);
 121     }
 122
 123   Drul_array<Molecule> edge_line;
 124   s = me->get_grob_property ("edge-height");
 125   if (gh_pair_p (s))
 126     {
 127       Direction d = LEFT;
 128       int dir = to_dir (me->get_grob_property ("direction"));
 129       do
 130         {
 131           if (broken[d])
 132             continue;
 133
 134           Real dx = 0.0;
 135           if (gh_pair_p (ew))
 136             dx = gh_scm2double (index_get_cell (ew, d)) * d;
 137
 138           Real dy = gh_scm2double (index_get_cell (s, d)) * - dir;
 139           if (dy)
 140             edge_line[d] = Line_spanner::line_molecule (me, thick, Offset(0,0),
 141                                                         Offset (dx, dy));
 142         }
 143       while (flip (&d) != LEFT);
 144     }
 145
 146   Molecule m;
 147   do
 148     {
 149       Interval ext = edge[d].extent (X_AXIS);
 150
 151       edge[d].translate_axis (span_points[d], X_AXIS);
 152       m.add_molecule (edge[d]);
 153       edge_line[d].translate_axis (span_points[d], X_AXIS);
 154       m.add_molecule (edge_line[d]);
 155       if (!ext.empty_b ())
 156         span_points[d] += -d *  ext[-d];
 157     }
 158   while (flip (&d) != LEFT);
 159
 160   Molecule l =Line_spanner::line_molecule (me, thick,
 161                                            Offset (span_points[LEFT], 0),
 162                                            Offset (span_points[RIGHT], 0));
 163   m.add_molecule (l);
 164
 165   m.translate_axis (- me->relative_coordinate (common, X_AXIS), X_AXIS);
 166   return m.smobbed_copy ();
 167 }
 168
 169
 170
 171
 172 ADD_INTERFACE (Text_spanner,"text-spanner-interface",
 173                "generic text spanner",
 174                "dash-period if-text-padding dash-length edge-height bracket-flare edge-text shorten-pair style thickness enclose-bounds width-correct");
 175