lily/text-spanner.cc

   1 /*
   2
   3   text-spanner.cc -- implement Text_spanner
   4
   5   source file of the GNU LilyPond music typesetter
   6
   7   (c) 2000--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "molecule.hh"
  11 #include "text-item.hh"
  12 #include "text-spanner.hh"
  13 #include "line-spanner.hh"
  14 #include "spanner.hh"
  15 #include "font-interface.hh"
  16 #include "dimensions.hh"
  17 #include "paper-def.hh"
  18 #include "debug.hh"
  19 #include "paper-column.hh"
  20 #include "staff-symbol-referencer.hh"
  21
  22 /*
  23   TODO:
  24     - vertical start / vertical end (fixme-name) |
  25     - contination types (vert. star, vert. end)  |-> eat volta-spanner
  26     - more styles
  27     - more texts/positions
  28  */
  29
  30 MAKE_SCHEME_CALLBACK (Text_spanner, brew_molecule, 1);
  31
  32 SCM
  33 Text_spanner::brew_molecule (SCM smob)
  34 {
  35   Grob *me= unsmob_grob (smob);
  36   Spanner *spanner = dynamic_cast<Spanner*> (me);
  37
  38
  39
  40   /* Ugh, must be same as Hairpin::brew_molecule.  */
  41   Real padding = gh_scm2double (me->get_grob_property ("if-text-padding"));
  42   Real broken_left =  spanner->get_broken_left_end_align ();
  43   Real width = spanner->spanner_length ();
  44   width -= broken_left;
  45
  46   Drul_array<bool> broken;
  47   Drul_array<Real> extra_off;
  48   Direction d = LEFT;
  49   do
  50     {
  51       extra_off [d]=0;
  52       Item *b = spanner->get_bound (d);
  53       broken[d] = b->break_status_dir () != CENTER;
  54
  55       if (!broken [d])
  56         {
  57
  58           Interval e = b->extent (b, X_AXIS);
  59           Real r = 0.0;
  60           if (!e.empty_b ())
  61             r = e[-d] + padding;
  62           /* Text spanners such as ottava, should span from outer limits of
  63            noteheads, iso (de)cresc. spanners that span the inner space */
  64           if (me->get_grob_property ("outer") != SCM_EOL)
  65             // r *= -1; // huh?
  66             {
  67               width -= d * r;
  68             }
  69           else
  70             {
  71               width += d * r;
  72               extra_off[d] = r;
  73             }
  74         }
  75     }
  76   while (flip (&d) != LEFT);
  77
  78   // FIXME: ecs tells us -- only for (de)cresc. spanners
  79   width += gh_scm2double (me->get_grob_property ("width-correct"));
  80   /* /Ugh */
  81
  82
  83   SCM properties = Font_interface::font_alist_chain (me);
  84
  85   SCM edge_text = me->get_grob_property ("edge-text");
  86   Drul_array<Molecule> edge;
  87   if (gh_pair_p (edge_text))
  88     {
  89       Direction d = LEFT;
  90       do
  91         {
  92           /*  Don't repeat edge text for broken end */
  93           if (!broken[d])
  94             {
  95               SCM text = index_cell (edge_text, d);
  96               edge[d] = Text_item::text2molecule (me, text, properties);
  97               if (!edge[d].empty_b ())
  98                 edge[d].align_to (Y_AXIS, CENTER);
  99             }
 100         }
 101       while (flip (&d) != LEFT);
 102     }
 103   width -= edge[LEFT].extent (X_AXIS).length ()
 104     + edge[RIGHT].extent (X_AXIS).length ();
 105
 106   Drul_array<Real> shorten;
 107   shorten[LEFT] = 0;
 108   shorten[RIGHT] = 0;
 109
 110   SCM s = me->get_grob_property ("shorten");
 111   if (gh_pair_p (s))
 112     {
 113       shorten[LEFT] = gh_scm2double (gh_car (s));
 114       shorten[RIGHT] = gh_scm2double (gh_cdr (s));
 115     }
 116
 117   width -= shorten[LEFT] + shorten[RIGHT];
 118
 119   if (width < 0)
 120     {
 121       warning (_ ("Text_spanner too small"));
 122       width = 0;
 123     }
 124
 125   /* ugh */
 126   Real thick = me->paper_l ()->get_var ("stafflinethickness");
 127
 128   Molecule line = Line_spanner::line_molecule (me, width, 0);
 129
 130   Drul_array<Molecule> edge_line;
 131   s = me->get_grob_property ("edge-height");
 132   if (gh_pair_p (s))
 133     {
 134       Direction d = LEFT;
 135       int dir = to_dir (me->get_grob_property ("direction"));
 136       do
 137         {
 138           Real dy = gh_scm2double (index_cell (s, d)) * - dir;
 139           if (dy)
 140             {
 141               SCM list = Line_spanner::line_atom (me, 0, dy);
 142               Box b (Interval (0, thick),
 143                      dy > 0
 144                      ? Interval (0, dy)
 145                      : Interval (dy, 0));
 146               edge_line[d] = Molecule (b, list);
 147             }
 148         }
 149       while (flip (&d) != LEFT);
 150     }
 151
 152   Molecule m;
 153   if (!edge[LEFT].empty_b ())
 154     m = edge[LEFT];
 155
 156   if (!edge_line[LEFT].empty_b ())
 157     m.add_at_edge (X_AXIS, RIGHT, edge_line[LEFT], 0);
 158   if (!line.empty_b ())
 159     m.add_at_edge (X_AXIS, RIGHT, line, 0);
 160   if (!edge_line[RIGHT].empty_b ())
 161     m.add_at_edge (X_AXIS, RIGHT, edge_line[RIGHT], 0);
 162   if (!edge[RIGHT].empty_b ())
 163     m.add_at_edge (X_AXIS, RIGHT, edge[RIGHT], 0);
 164   m.translate_axis (broken_left + extra_off[LEFT], X_AXIS);
 165
 166   return m.smobbed_copy ();
 167 }
 168
 169