lily/horizontal-bracket.cc

   1 /*
   2   horizontal-bracket.cc -- implement  Horizontal_bracket
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2002--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "side-position-interface.hh"
  10 #include "lookup.hh"
  11 #include "pointer-group-interface.hh"
  12 #include "directional-element-interface.hh"
  13 #include "output-def.hh"
  14 #include "staff-symbol-referencer.hh"
  15 #include "tuplet-bracket.hh"    // ugh.
  16
  17 struct Horizontal_bracket
  18 {
  19   DECLARE_SCHEME_CALLBACK (print, (SCM));
  20   static bool has_interface (Grob *);
  21 };
  22
  23 /*
  24   TODO:
  25
  26   This doesn't look very elegant: should support winged edges.
  27
  28   Support texts on the brackets?
  29 */
  30 MAKE_SCHEME_CALLBACK (Horizontal_bracket, print, 1);
  31
  32 SCM
  33 Horizontal_bracket::print (SCM smob)
  34 {
  35   Grob *me = unsmob_grob (smob);
  36   Spanner *sp = dynamic_cast<Spanner *> (me);
  37
  38   extract_grob_set (me, "columns", gs);
  39   if (!gs.size ())
  40     {
  41       me->suicide ();
  42       return SCM_EOL;
  43     }
  44   Grob *cx = common_refpoint_of_array (gs, me, X_AXIS);
  45   cx = cx->common_refpoint (sp->get_bound (LEFT), X_AXIS);
  46   cx = cx->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
  47
  48   Interval ext = gs.top ()->extent (cx, X_AXIS);
  49   ext.unite (gs[0]->extent (cx, X_AXIS));
  50
  51   Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
  52                                                       Interval (1.0, 1.0));
  53
  54   Drul_array<Real> flare = robust_scm2interval (me->get_property ("bracket-flare"),
  55                                                 Interval (0, 0));
  56
  57   Drul_array<Real> shorten = robust_scm2interval (me->get_property ("shorten-pair"),
  58                                                   Interval (0, 0));
  59
  60   // Make sure that it points in the correct direction:
  61   Real dir = get_grob_direction (me);
  62   scale_drul (&edge_height, -dir);
  63
  64   Interval empty;
  65   Stencil b
  66     = Tuplet_bracket::make_bracket (me, Y_AXIS, Offset (ext.length (), 0),
  67                                     edge_height, empty, flare, shorten);
  68
  69   b.translate_axis (ext[LEFT] - sp->get_bound (LEFT)->relative_coordinate (cx, X_AXIS), X_AXIS);
  70
  71   return b.smobbed_copy ();
  72 }
  73
  74 ADD_INTERFACE (Horizontal_bracket, "horizontal-bracket-interface",
  75                "A horizontal bracket encompassing notes.",
  76                "columns bracket-flare shorten-pair edge-height");
  77