lily/volta-bracket.cc

   1 /*
   2   volta-bracket.cc -- implement Volta_bracket_interface
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2009 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include <cstring>
  10 using namespace std;
  11
  12 #include "warn.hh"
  13 #include "font-interface.hh"
  14 #include "line-interface.hh"
  15 #include "paper-column.hh"
  16 #include "output-def.hh"
  17 #include "text-interface.hh"
  18 #include "volta-bracket.hh"
  19 #include "pointer-group-interface.hh"
  20 #include "side-position-interface.hh"
  21 #include "directional-element-interface.hh"
  22 #include "lookup.hh"
  23 #include "tuplet-bracket.hh"
  24
  25 /*
  26   this is too complicated. Yet another version of side-positioning,
  27   badly implemented.
  28
  29   --
  30
  31   * Should look for system_start_delim to find left edge of staff.
  32   */
  33
  34 MAKE_SCHEME_CALLBACK (Volta_bracket_interface, print, 1);
  35 SCM
  36 Volta_bracket_interface::print (SCM smob)
  37 {
  38   Spanner *me = unsmob_spanner (smob);
  39   Spanner *orig_span = dynamic_cast<Spanner *> (me->original ());
  40   bool broken_first_bracket = orig_span && (orig_span->broken_intos_[0]
  41                                             == (Spanner *)me);
  42
  43   Output_def *layout = me->layout ();
  44   Real half_space = 0.5;
  45
  46   Item *bound = dynamic_cast<Spanner *> (me)->get_bound (LEFT);
  47
  48   /*
  49     not a start, but really broken in two
  50   */
  51   Real left = 0.;
  52   if (bound->break_status_dir () == RIGHT)
  53     {
  54       Paper_column *pc = bound->get_column ();
  55       left = pc->extent (pc, X_AXIS)[RIGHT]
  56         - bound->relative_coordinate (pc, X_AXIS);
  57     }
  58   else
  59     {
  60       /*
  61         the volta spanner is attached to the bar-line, which is moved
  62         to the right. We don't need to compensate for the left edge.
  63       */
  64     }
  65
  66   modify_edge_height (me);
  67   if (!me->is_live ())
  68     return SCM_EOL;
  69
  70   Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
  71                                                       Interval (1.0, 1.0));
  72   Drul_array<Real> flare = robust_scm2interval (me->get_property ("bracket-flare"),
  73                                                 Interval (0, 0));
  74   Drul_array<Real> shorten = robust_scm2interval (me->get_property ("shorten-pair"),
  75                                                   Interval (0, 0));
  76
  77
  78
  79   scale_drul (&edge_height, - Real (get_grob_direction (me)));
  80
  81   Interval empty;
  82   Offset start;
  83   start[X_AXIS] = me->spanner_length () - left - half_space;
  84
  85   /*
  86     ugh, Tuplet_bracket should use Horizontal_bracket, not the other way around.
  87   */
  88   Stencil total
  89     = Tuplet_bracket::make_bracket (me, Y_AXIS, start,
  90                                     edge_height, empty, flare, shorten);
  91
  92   if (!orig_span || broken_first_bracket)
  93     {
  94       SCM text = me->get_property ("text");
  95       SCM properties = me->get_property_alist_chain (SCM_EOL);
  96       SCM snum = Text_interface::interpret_markup (layout->self_scm (),
  97                                                    properties, text);
  98       Stencil num = *unsmob_stencil (snum);
  99       num.align_to (Y_AXIS, UP);
 100       num.translate_axis (-0.5, Y_AXIS);
 101       total.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
 102                          - 1.0);
 103     }
 104
 105   total.translate_axis (left, X_AXIS);
 106   return total.smobbed_copy ();
 107 }
 108
 109
 110 void
 111 Volta_bracket_interface::modify_edge_height (Spanner *me)
 112 {
 113   Spanner *orig_span = dynamic_cast<Spanner *> (me->original ());
 114
 115   bool broken_first_bracket = orig_span && (orig_span->broken_intos_[0] == (Spanner *)me);
 116   bool broken_last_bracket = orig_span && (orig_span->broken_intos_.back () == (Spanner *)me);
 117   bool no_vertical_start = orig_span && !broken_first_bracket;
 118   bool no_vertical_end = orig_span && !broken_last_bracket;
 119
 120   extract_grob_set (me, "bars", bars);
 121   Grob *endbar = bars.size () ? bars.back () : 0;
 122   SCM glyph = endbar ? endbar->get_property ("glyph-name") : SCM_EOL;
 123
 124   string str;
 125   if (scm_is_string (glyph))
 126     str = ly_scm2string (glyph);
 127   else
 128     str = "|";
 129
 130   no_vertical_end
 131     |= (str != ":|"
 132         && str != "|:"
 133         && str != "|."
 134         && str != ":|:"
 135         && str != ":|.|:"
 136         && str != ":|.:"
 137         && str != ".|");
 138
 139   if (no_vertical_end || no_vertical_start)
 140     {
 141       Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
 142                                                           Interval (1.0, 1.0));
 143       if (no_vertical_start)
 144         edge_height[LEFT] = 0.0;
 145
 146       if (no_vertical_end)
 147         edge_height[RIGHT] = 0.0;
 148
 149       me->set_property ("edge-height", ly_interval2scm (edge_height));
 150     }
 151
 152   if (broken_last_bracket && no_vertical_end && no_vertical_start
 153       && !broken_first_bracket)
 154     me->suicide ();
 155 }
 156
 157 void
 158 Volta_bracket_interface::add_bar (Grob *me, Item *b)
 159 {
 160   Pointer_group_interface::add_grob (me, ly_symbol2scm ("bars"), b);
 161   add_bound_item (dynamic_cast<Spanner *> (me), b);
 162 }
 163
 164 ADD_INTERFACE (Volta_bracket_interface,
 165                "Volta bracket with number.",
 166
 167                /* properties */
 168                "bars "
 169                "thickness "
 170                "height "
 171                );
 172