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--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "side-position-interface.hh"
  11 #include "lookup.hh"
  12 #include "group-interface.hh"
  13 #include "directional-element-interface.hh"
  14 #include "paper-def.hh"
  15
  16 struct Horizontal_bracket
  17 {
  18   DECLARE_SCHEME_CALLBACK (brew_molecule, (SCM));
  19   static bool has_interface (Grob*);
  20 };
  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 */
  31
  32 MAKE_SCHEME_CALLBACK(Horizontal_bracket, brew_molecule, 1);
  33
  34 SCM
  35 Horizontal_bracket::brew_molecule (SCM smob)
  36 {
  37   Grob * me = unsmob_grob (smob);
  38   Spanner *sp = dynamic_cast<Spanner*> (me);
  39   Link_array<Grob> gs = Pointer_group_interface__extract_grobs (me,(Grob*)0, "columns");
  40
  41   if (!gs.size())
  42     {
  43       me->suicide();
  44       return SCM_EOL;
  45     }
  46   Grob * cx = common_refpoint_of_array (gs, me, X_AXIS);
  47   cx = cx->common_refpoint (sp->get_bound (LEFT), X_AXIS);
  48   cx = cx->common_refpoint (sp->get_bound (RIGHT),X_AXIS);
  49
  50   Interval ext = gs.top()->extent (cx, X_AXIS);
  51   ext.unite (gs[0]->extent (cx, X_AXIS));
  52
  53   Direction d = Directional_element_interface::get (me);
  54   Real t = me->get_paper()->get_var ("linethickness");
  55
  56   SCM lthick = me->get_grob_property ("thickness");
  57   if (gh_number_p (lthick))
  58     t *= gh_scm2double (lthick);
  59
  60   Molecule b = Lookup::bracket (X_AXIS, ext, t, - d* 1.0);
  61
  62   b.translate_axis ( - sp->get_bound (LEFT)->relative_coordinate (cx, X_AXIS), X_AXIS);
  63
  64   return b.smobbed_copy();
  65 }
  66
  67 ADD_INTERFACE (Horizontal_bracket,"horizontal-bracket-interface",
  68   "A horizontal bracket encompassing notes.",
  69   "thickness columns direction");
  70