lily/bow.cc

   1 /*
   2   bow.cc -- implement Bow
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7       Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "bow.hh"
  11 #include "debug.hh"
  12 #include "paper-def.hh"
  13 #include "molecule.hh"
  14 #include "lookup.hh"
  15 #include "bezier.hh"
  16 #include "main.hh"
  17
  18 Bow::Bow ()
  19 {
  20   dy_f_drul_[LEFT] = dy_f_drul_[RIGHT] = 0.0;
  21   dx_f_drul_[LEFT] = dx_f_drul_[RIGHT] = 0.0;
  22 }
  23
  24 Molecule*
  25 Bow::do_brew_molecule_p () const
  26 {
  27   Real thick = paper_l ()->get_var ("slur_thickness");
  28   Array<Offset> c = get_controls ();
  29   Real dy = c[3].y () - c[0].y ();
  30   Molecule a;
  31
  32   SCM d =  get_elt_property (dashed_scm_sym);
  33   if (d == SCM_BOOL_F)
  34     a = lookup_l ()->slur (c, thick);
  35   else
  36     a = lookup_l ()->dashed_slur (c, thick, gh_scm2int (SCM_CDR(d)));
  37
  38   if (check_debug && !monitor->silent_b ("Bow"))
  39     {
  40       static int i = 1;
  41       cout << "******" << i++ << "******" << endl;
  42       cout << "c0.y: " << c[0].y () << endl;
  43       cout << "c3.y: " << c[3].y () << endl;
  44       cout << "dy: " << dy << endl;
  45       cout << "dy_f_l: " << dy_f_drul_[LEFT] << endl;
  46       cout << "dy_f_r: " << dy_f_drul_[RIGHT] << endl;
  47       cout << "dy_f: " << dy_f_drul_[RIGHT] - dy_f_drul_[LEFT] << endl;
  48     }
  49   return new Molecule (a);
  50 }
  51
  52 Offset
  53 Bow::center () const
  54 {
  55   Real dy = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
  56   Real dx =  extent(X_AXIS).length ();
  57
  58   return Offset (dx / 2, dy);
  59 }
  60
  61 /*
  62    Ugh.  Control points are too crude measures.
  63  */
  64 Interval
  65 Bow::do_height () const
  66 {
  67   Interval iv;
  68   Array<Offset> c (get_controls());
  69   for (int i=0; i < c.size (); i++)
  70     {
  71       Real y = c[i][Y_AXIS];
  72       iv.unite (Interval (y,y));
  73     }
  74   return iv;
  75 }
  76
  77 Drul_array<Interval>
  78 Bow::curve_extent_drul () const
  79 {
  80   Bezier_bow b (paper_l ());
  81   b.set (get_encompass_offset_arr (), dir_);
  82   b.calc ();
  83   return b.curve_extent_drul_;
  84 }
  85
  86 Array<Offset>
  87 Bow::get_controls () const
  88 {
  89   Bezier_bow b (paper_l ());
  90   b.set (get_encompass_offset_arr (), dir_);
  91   b.calc ();
  92   Array<Offset> controls;
  93   controls.set_size (8);
  94   for (int i = 0; i < 4; i++)
  95     controls[i] = b.control_[i];
  96   for (int i = 0; i < 4; i++)
  97     controls[i + 4] = b.return_[i];
  98   return controls;
  99 }
 100
 101 Array<Offset>
 102 Bow::get_encompass_offset_arr () const
 103 {
 104   Array<Offset> offset_arr;
 105   offset_arr.push (Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]));
 106   offset_arr.push (Offset (do_width ().length () + dx_f_drul_[RIGHT],
 107                       dy_f_drul_[RIGHT]));
 108
 109   return offset_arr;
 110 }
 111