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--2005 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   Revised over good by Han-Wen.
   9 */
  10
  11 #include "text-spanner.hh"
  12
  13 #include "text-interface.hh"
  14 #include "line-spanner.hh"
  15 #include "spanner.hh"
  16 #include "font-interface.hh"
  17 #include "dimensions.hh"
  18 #include "output-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, print, 1);
  32
  33 /*
  34   TODO: this function is too long
  35 */
  36 SCM
  37 Text_spanner::print (SCM smob)
  38 {
  39   Grob *me = unsmob_grob (smob);
  40   Spanner *spanner = dynamic_cast<Spanner *> (me);
  41
  42   /* Ugh, must be same as Hairpin::print.  */
  43
  44   Grob *common = spanner->get_bound (LEFT)->common_refpoint (spanner->get_bound (RIGHT), X_AXIS);
  45   Output_def *layout = me->get_layout ();
  46
  47   SCM flare = me->get_property ("bracket-flare");
  48   SCM shorten = me->get_property ("shorten-pair");
  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           Real encl = robust_scm2double (me->get_property ("enclose-bounds"), 0.0);
  68           Interval ext = b->extent (common, X_AXIS);
  69
  70           span_points[d]
  71             = robust_relative_extent (b, common, X_AXIS).linear_combination (d * encl);
  72
  73           if (is_number_pair (shorten))
  74             span_points -= d * scm_to_double (index_get_cell (shorten, d));
  75         }
  76
  77       if (is_number_pair (flare))
  78         span_points -= d * scm_to_double (index_get_cell (flare, d));
  79     }
  80   while (flip (&d) != LEFT);
  81
  82   SCM properties = Font_interface::text_font_alist_chain (me);
  83   SCM edge_text = me->get_property ("edge-text");
  84   Drul_array<Stencil> edge;
  85   if (scm_is_pair (edge_text))
  86     {
  87       Direction d = LEFT;
  88       do
  89         {
  90           if (broken[d])
  91             continue;
  92
  93           SCM text = index_get_cell (edge_text, d);
  94
  95           if (Text_interface::markup_p (text))
  96             edge[d] = *unsmob_stencil (Text_interface::interpret_markup (layout->self_scm (), properties, text));
  97
  98           if (!edge[d].is_empty ())
  99             edge[d].align_to (Y_AXIS, CENTER);
 100         }
 101       while (flip (&d) != LEFT);
 102     }
 103
 104   Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
 105                                                       Interval (0.0, 0.0));
 106   Drul_array<Stencil> edge_line;
 107   {
 108     Direction d = LEFT;
 109     int dir = to_dir (me->get_property ("direction"));
 110     do
 111       {
 112         if (broken[d])
 113           continue;
 114
 115         Real dx = 0.0;
 116         if (is_number_pair (flare))
 117           dx = scm_to_double (index_get_cell (flare, d)) * d;
 118
 119         Real dy = -dir * edge_height[d];
 120         if (dy)
 121           edge_line[d] = Line_spanner::line_stencil (me, Offset (0, 0), Offset (dx, dy));
 122       }
 123     while (flip (&d) != LEFT);
 124   }
 125
 126   Stencil m;
 127   do
 128     {
 129       Interval ext = edge[d].extent (X_AXIS);
 130       if (!ext.is_empty ())
 131         {
 132           Real pad = robust_scm2double (me->get_property ("bound-padding"), 0.0);
 133           edge[d].translate_axis (span_points[d], X_AXIS);
 134           m.add_stencil (edge[d]);
 135           span_points[d] += -d * (ext[-d] + pad);
 136         }
 137     }
 138   while (flip (&d) != LEFT);
 139
 140   do
 141     {
 142       if (d * span_points[d] > d * edge[-d].extent (X_AXIS)[d])
 143         {
 144           edge_line[d].translate_axis (span_points[d], X_AXIS);
 145           m.add_stencil (edge_line[d]);
 146         }
 147     }
 148   while (flip (&d) != LEFT);
 149
 150   if (!span_points.is_empty ())
 151     {
 152       Stencil l = Line_spanner::line_stencil (me,
 153                                               Offset (span_points[LEFT], 0),
 154                                               Offset (span_points[RIGHT], 0));
 155       m.add_stencil (l);
 156     }
 157   m.translate_axis (- me->relative_coordinate (common, X_AXIS), X_AXIS);
 158   return m.smobbed_copy ();
 159 }
 160
 161 ADD_INTERFACE (Text_spanner, "text-spanner-interface",
 162                "generic text spanner",
 163                "bound-padding dash-period dash-fraction edge-height bracket-flare edge-text shorten-pair style thickness enclose-bounds");
 164