lily/stem-tremolo.cc

   1 /*
   2   abbrev.cc --  implement Stem_tremolo
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "stem-tremolo.hh"
  11 #include "debug.hh"
  12 #include "beam.hh"
  13 #include "paper-def.hh"
  14 #include "lookup.hh"
  15 #include "stem.hh"
  16 #include "offset.hh"
  17 #include "dimension-cache.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "directional-element-interface.hh"
  20
  21 Stem_tremolo::Stem_tremolo ()
  22 {
  23   set_elt_property ("stem", SCM_EOL);
  24 }
  25
  26
  27 Stem *
  28 Stem_tremolo::stem_l ()const
  29 {
  30   SCM s =   get_elt_property ("stem");
  31
  32   return dynamic_cast<Stem*> (  unsmob_element (s));
  33 }
  34
  35 Interval
  36 Stem_tremolo::dim_callback (Dimension_cache const *c)
  37 {
  38   Stem_tremolo * s = dynamic_cast<Stem_tremolo*> (c->element_l ());
  39   Real space = Staff_symbol_referencer_interface (s->stem_l ())
  40     .staff_space ();
  41   return Interval (-space, space);
  42 }
  43
  44
  45 Molecule*
  46 Stem_tremolo::do_brew_molecule_p () const
  47 {
  48   Stem * st = stem_l ();
  49   int mult =0;
  50   if (Beam * b = st->beam_l ())
  51     {
  52       mult = b->get_multiplicity ();
  53     }
  54
  55   Real interbeam_f = paper_l ()->interbeam_f (mult);
  56   Real w  = gh_scm2double (get_elt_property ("beam-width"));
  57   Real space = Staff_symbol_referencer_interface (st).staff_space ();
  58   Real half_staff_space = space / 2;
  59   Real beam_f = gh_scm2double (get_elt_property ("beam-thickness"));
  60
  61   int beams_i = 0;
  62   Real dydx = 0.25;
  63
  64   if (st && st->beam_l ())
  65     {
  66       Real dy = 0;
  67       SCM s = st->beam_l ()->get_elt_property ("height");
  68       if (gh_number_p (s))
  69         dy = gh_scm2double (s);
  70       Real dx = st->beam_l ()->last_visible_stem ()->hpos_f ()
  71         - st->beam_l ()->first_visible_stem ()->hpos_f ();
  72       dydx = dy/dx;
  73
  74       // ugh, rather calc from Stem_tremolo_req
  75       beams_i = st->beam_count(RIGHT) >? st->beam_count (LEFT);
  76     }
  77
  78   Molecule a (lookup_l ()->beam (dydx, w, beam_f));
  79   a.translate (Offset (-w/2, w / 2 * dydx));
  80
  81   int abbrev_flags = 1;
  82   {
  83     SCM a = get_elt_property ("abbrev-flags");
  84     if (gh_number_p (a))
  85       abbrev_flags = gh_scm2int (a);
  86   }
  87
  88   Molecule *beams= new Molecule;
  89   for (int i = 0; i < abbrev_flags; i++)
  90     {
  91       Molecule b (a);
  92       b.translate_axis (interbeam_f * i, Y_AXIS);
  93       beams->add_molecule (b);
  94     }
  95   beams->translate_axis (-beams->extent ()[Y_AXIS].center (), Y_AXIS);
  96
  97   if (st)
  98     {
  99       if (st->beam_l ())
 100         {
 101           beams->translate (Offset(st->hpos_f () - hpos_f (),
 102             st->stem_end_position () * half_staff_space -
 103             directional_element (st->beam_l ()).get () * beams_i * interbeam_f));
 104         }
 105       else
 106         {
 107           /*
 108             Beams should intersect one beamthickness below staff end
 109            */
 110           Real dy = - beams->extent ()[Y_AXIS].length () / 2 * st->get_direction ();
 111
 112           /*
 113             uhg.  Should use relative coords and placement
 114           */
 115           Real whole_note_correction = (st && st->invisible_b( ))
 116             ? 0.0 //  -st->get_direction () * st->note_delta_f ()/2
 117             : 0.0;
 118
 119           dy += st->stem_end_position ();
 120           beams->translate (Offset(st->hpos_f () - hpos_f ()+
 121                                    whole_note_correction, dy));
 122         }
 123
 124       /*
 125         there used to be half a page of code that was long commented out.
 126         Removed in 1.1.35
 127        */
 128     }
 129
 130   return beams;
 131 }
 132
 133
 134 void
 135 Stem_tremolo::set_stem (Stem *s)
 136 {
 137   set_elt_property ("stem", s->self_scm_);
 138   add_dependency (s);
 139 }
 140