lily/crescendo.cc

   1 /*
   2   crescendo.cc -- implement Crescendo
   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 #include "molecule.hh"
  10 #include "crescendo.hh"
  11 #include "lookup.hh"
  12 #include "dimensions.hh"
  13 #include "paper-def.hh"
  14 #include "debug.hh"
  15 #include "paper-column.hh"
  16 #include "atom.hh"
  17
  18 Crescendo::Crescendo ()
  19 {
  20   set_elt_property ("dynamic-drul", gh_cons (SCM_BOOL_F, SCM_BOOL_F));
  21 }
  22
  23
  24
  25 Molecule*
  26 Crescendo::do_brew_molecule_p () const
  27 {
  28   Real absdyn_dim = paper_l ()-> get_var ("crescendo_shorten");
  29   Real extra_left =  get_broken_left_end_align ();
  30
  31   SCM dir = get_elt_property("grow-dir");
  32   SCM dyns = get_elt_property ("dynamic-drul");
  33
  34   if (!isdir_b (dir) || !gh_pair_p (dyns))
  35     {
  36       set_elt_property ("transparent", SCM_BOOL_T);
  37       return new Molecule;
  38     }
  39
  40   Direction gd = to_dir (dir);
  41
  42   bool dynleft= to_boolean (gh_car (dyns));
  43   bool dynright = to_boolean (gh_cdr (dyns));
  44
  45   if (dynleft)
  46     extra_left += absdyn_dim;
  47
  48
  49
  50   Real width = spanner_length()- get_broken_left_end_align ();
  51
  52   if (dynleft)
  53     {
  54       width -= absdyn_dim;
  55     }
  56   if (dynright)
  57     {
  58       width -= absdyn_dim;
  59     }
  60
  61   if (width < 0)
  62     {
  63       warning (_ ("crescendo") + " " + _ ("too small"));
  64       width = 0;
  65     }
  66
  67   Drul_array<bool> broken;
  68   Direction d = LEFT;
  69   do {
  70     Paper_column* s = dynamic_cast<Paper_column*>(spanned_drul_[d]); // UGH
  71     broken[d] = (!s->musical_b ());
  72   } while (flip (&d) != LEFT);
  73
  74
  75   bool continued = broken[Direction (-gd)];
  76   Real height = paper_l()->get_var ("crescendo_height");
  77   Real thick = paper_l ()->get_var ("crescendo_thickness");
  78
  79   const char* hairpin = (gd < 0)? "decrescendo" :  "crescendo";
  80   Atom at  (gh_list (ly_symbol2scm (hairpin),
  81                      gh_double2scm (thick),
  82                      gh_double2scm (width),
  83                      gh_double2scm (height),
  84                      gh_double2scm (continued ? height/2 : 0.0),
  85                      SCM_UNDEFINED));
  86   Molecule * m
  87     = new Molecule;
  88
  89   m->dim_.x () = Interval (0, width);
  90   m->dim_.y () = Interval (-2*height, 2*height);
  91   m->add_atom (&at);
  92
  93   m->translate_axis (extra_left, X_AXIS);
  94   return m;
  95 }
  96
  97