lily/dots.cc

   1 /*
   2   dots.cc -- implement Dots
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "dots.hh"
  10 #include "item.hh"
  11 #include "molecule.hh"
  12 #include "paper-def.hh"
  13 #include "font-interface.hh"
  14 #include "lookup.hh"
  15 #include "staff-symbol-referencer.hh"
  16 #include "directional-element-interface.hh"
  17
  18
  19 MAKE_SCHEME_CALLBACK (Dots,quantised_position_callback,2);
  20 SCM
  21 Dots::quantised_position_callback (SCM element_smob, SCM axis)
  22 {
  23   Grob *me = unsmob_grob (element_smob);
  24   Axis a = (Axis) gh_scm2int (axis);
  25   assert (a == Y_AXIS);
  26
  27   SCM d= me->get_grob_property ("dot-count");
  28   if (gh_number_p (d) && gh_scm2int (d))
  29     {
  30       if (!Directional_element_interface::get (me))
  31         Directional_element_interface::set (me, UP);
  32
  33       if (Staff_symbol_referencer::on_staffline (me))
  34         return gh_double2scm (Staff_symbol_referencer::staff_space (me) / 2.0 * Directional_element_interface::get (me));
  35     }
  36
  37   return gh_double2scm (0.0);
  38 }
  39
  40
  41 MAKE_SCHEME_CALLBACK (Dots,brew_molecule,1);
  42 SCM
  43 Dots::brew_molecule (SCM d)
  44 {
  45   Grob *sc = unsmob_grob (d);
  46   Molecule mol;
  47
  48   SCM c = sc->get_grob_property ("dot-count");
  49
  50   if (gh_number_p (c))
  51     {
  52       Molecule d = Font_interface::get_default_font (sc)->find_by_name (String ("dots-dot"));
  53       Real dw = d.extent (X_AXIS).length ();
  54
  55
  56       /*
  57         we need to add a real blank box, to assure that
  58         side-positioning doth not cancel the left-most padding.  */
  59       mol = Lookup::blank (Box (Interval (0,0),
  60                                 Interval (0,0)));
  61
  62       for (int i = gh_scm2int (c); i--;)
  63         {
  64           d.translate_axis (2*dw,X_AXIS);
  65           mol.add_at_edge (X_AXIS, RIGHT, d, dw);
  66         }
  67     }
  68   return mol.smobbed_copy ();
  69 }
  70
  71
  72