lily/hairpin.cc

   1 /*
   2   hairpin.cc -- implement Hairpin
   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 #include "molecule.hh"
  10 #include "hairpin.hh"
  11 #include "spanner.hh"
  12 #include "font-interface.hh"
  13 #include "dimensions.hh"
  14 #include "paper-def.hh"
  15 #include "debug.hh"
  16 #include "paper-column.hh"
  17
  18 MAKE_SCHEME_CALLBACK (Hairpin, brew_molecule, 1);
  19
  20 SCM
  21 Hairpin::brew_molecule (SCM smob)
  22 {
  23   Grob *me= unsmob_grob (smob);
  24   Spanner *spanner = dynamic_cast<Spanner*>(me);
  25
  26   Real line = me->paper_l ()->get_var ("stafflinethickness");
  27
  28   SCM s = me->get_grob_property("grow-direction");
  29   if (!isdir_b (s))
  30     {
  31       me->suicide ();
  32       return SCM_EOL;
  33     }
  34
  35   Direction grow_dir = to_dir (s);
  36
  37
  38   /* Ugh, must be same as Text_spanner::brew_molecule.  */
  39   Real padding = gh_scm2double (me->get_grob_property ("if-text-padding"));
  40   Real broken_left =  spanner->get_broken_left_end_align ();
  41   Real width = spanner->spanner_length ();
  42   width -= broken_left;
  43
  44   Drul_array<bool> broken;
  45   Drul_array<Real> extra_off;
  46   Direction d = LEFT;
  47   do
  48     {
  49       Item *b = spanner->get_bound (d);
  50       broken[d] = b->break_status_dir () != CENTER;
  51
  52       if (!broken [d])
  53         {
  54
  55           Interval e =b->extent (b, X_AXIS);
  56           Real r = 0.0;
  57           if (!e.empty_b ())
  58             r = e[-d] + padding;
  59           width += d * r;
  60           extra_off[d] = r;
  61         }
  62     }
  63   while (flip (&d) != LEFT);
  64
  65   // FIXME: ecs tells us
  66   width += gh_scm2double (me->get_grob_property ("width-correct"));
  67   /* /Ugh */
  68
  69   if (width < 0)
  70     {
  71       warning (_ ((grow_dir < 0) ? "decrescendo too small"
  72                   : "crescendo too small"));
  73       width = 0;
  74     }
  75
  76   bool continued = broken[Direction (-grow_dir)];
  77   Real height = gh_scm2double (me->get_grob_property ("height"));
  78   Real thick = line * gh_scm2double (me->get_grob_property ("thickness"));
  79
  80   const char* type = (grow_dir < 0) ? "decrescendo" :  "crescendo";
  81   SCM hairpin = gh_list (ly_symbol2scm (type),
  82                     gh_double2scm (thick),
  83                     gh_double2scm (width),
  84                     gh_double2scm (height),
  85                     gh_double2scm (continued ? height/2 : 0.0),
  86                     SCM_UNDEFINED);
  87
  88   Box b (Interval (0, width), Interval (-2*height, 2*height));
  89   Molecule mol (b, hairpin);
  90   mol.translate_axis (broken_left + extra_off[LEFT], X_AXIS);
  91
  92   return mol.smobbed_copy ();
  93 }
  94
  95