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--1999 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
  18 Stem_tremolo::Stem_tremolo ()
  19 {
  20   stem_l_ = 0;
  21   abbrev_flags_i_ = 1;
  22 }
  23
  24 void
  25 Stem_tremolo::do_print () const
  26 {
  27   DOUT << "abbrev_flags_i_ " << abbrev_flags_i_;
  28 }
  29
  30 Interval
  31 Stem_tremolo::do_width () const
  32 {
  33   Real space = stem_l_->staff_line_leading_f ();
  34   return Interval (-space, space);
  35 }
  36
  37 void
  38 Stem_tremolo::do_pre_processing ()
  39 {
  40 }
  41
  42 Molecule*
  43 Stem_tremolo::do_brew_molecule_p () const
  44 {
  45   int mult =0;
  46   if (Beam * b = stem_l_->beam_l_)
  47     {
  48       Stem_info i = b->get_stem_info (stem_l_);
  49       mult = i.mult_i_;
  50     }
  51
  52   Real interbeam_f = paper_l ()->interbeam_f (mult);
  53   Real w = 1.5 * lookup_l ()->notehead (2, "").dim_[X_AXIS].length ();
  54   Real space = stem_l_->staff_line_leading_f ();
  55   Real internote_f = space/2;
  56
  57   Real beam_f = paper_l ()->beam_thickness_f ();
  58
  59   int beams_i = 0;
  60   Real slope_f = internote_f / 4 / internote_f; // HUH?
  61
  62   if (stem_l_ && stem_l_->beam_l_) {
  63     slope_f = stem_l_->beam_l_->slope_f_;
  64     // ugh, rather calc from Stem_tremolo_req
  65     beams_i = stem_l_->beams_i_drul_[RIGHT] >? stem_l_->beams_i_drul_[LEFT];
  66   }
  67   Real sl = slope_f * internote_f;
  68
  69   Molecule a (lookup_l ()->beam (sl, w, beam_f));
  70   a.translate (Offset (-w/2, w / 2 * slope_f));
  71
  72   Molecule *beams= new Molecule;
  73   for (int i = 0; i < abbrev_flags_i_; i++)
  74     {
  75       Molecule b (a);
  76       b.translate_axis (interbeam_f * i, Y_AXIS);
  77       beams->add_molecule (b);
  78     }
  79   beams->translate_axis (-beams->extent ()[Y_AXIS].center (), Y_AXIS);
  80
  81   if (stem_l_)
  82     {
  83       if (stem_l_->beam_l_)
  84         {
  85           beams->translate (Offset(stem_l_->hpos_f () - hpos_f (),
  86             stem_l_->stem_end_f () * internote_f -
  87             stem_l_->beam_l_->dir_ * beams_i * interbeam_f));
  88         }
  89       else
  90         {
  91           /*
  92             Beams should intersect one beamthickness below staff end
  93            */
  94           Real dy = - beams->extent ()[Y_AXIS].length () / 2 * stem_l_->dir_;
  95
  96           /*
  97             uhg.  Should use relative coords and placement
  98           */
  99           Real whole_note_correction = (stem_l_ && stem_l_->invisible_b( ))
 100             ? -stem_l_->get_dir () * stem_l_->note_delta_f ()/2
 101             : 0.0;
 102
 103           /*
 104             UGH. Internote fudging.
 105            */
 106           dy /= internote_f;
 107           dy += stem_l_->stem_end_f ();
 108           dy *= internote_f;
 109           beams->translate (Offset(stem_l_->hpos_f () - hpos_f ()+
 110                                    whole_note_correction, dy));
 111         }
 112
 113       /*
 114         there used to be half a page of code that was long commented out.
 115         Removed in 1.1.35
 116        */
 117     }
 118
 119   return beams;
 120 }
 121
 122 void
 123 Stem_tremolo::do_substitute_element_pointer (Score_element*o, Score_element*n)
 124 {
 125   if (stem_l_ == o)
 126     stem_l_ = dynamic_cast<Stem*> (n);
 127 }
 128
 129
 130 void
 131 Stem_tremolo::set_stem (Stem *s)
 132 {
 133   stem_l_ = s;
 134   add_dependency (s);
 135 }