lily/grid-line-interface.cc

   1 /*
   2   grid-line-interface.cc --  implement Grid_line_interface
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "grid-line-interface.hh"
  10
  11 #include "grob.hh"
  12 #include "pointer-group-interface.hh"
  13 #include "lookup.hh"
  14 #include "output-def.hh"
  15
  16 MAKE_SCHEME_CALLBACK (Grid_line_interface, print, 1);
  17 SCM
  18 Grid_line_interface::print (SCM smobbed_me)
  19 {
  20   Grob *me = unsmob_grob (smobbed_me);
  21
  22   extract_grob_set (me, "elements", elts);
  23   /* compute common refpoint of elements */
  24   Grob *refp = common_refpoint_of_array (elts, me, Y_AXIS);
  25   Interval iv;
  26
  27   for (vsize i = 0; i < elts.size (); i++)
  28     {
  29       Grob *point = elts[i];
  30
  31       iv.unite (point->extent (refp, Y_AXIS));
  32     }
  33
  34   if (iv.is_empty ())
  35     {
  36       me->suicide ();
  37       return SCM_EOL;
  38     }
  39
  40   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  41   Real thick = robust_scm2double (me->get_property ("thickness"), 1.0)
  42     * staffline;
  43
  44   iv += -me->relative_coordinate (refp, Y_AXIS);
  45   Stencil st = Lookup::filled_box (Box (Interval (0, thick),
  46                                         iv));
  47
  48   return st.smobbed_copy ();
  49 }
  50
  51 MAKE_SCHEME_CALLBACK (Grid_line_interface, width, 1);
  52 SCM
  53 Grid_line_interface::width (SCM smob)
  54 {
  55   Grob *me = unsmob_grob (smob);
  56
  57   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  58   Real thick = robust_scm2double (me->get_property ("thickness"), 1.0)
  59     * staffline;
  60
  61   return ly_interval2scm (Interval (0, thick));
  62 }
  63
  64 void
  65 Grid_line_interface::add_grid_point (Grob *me, Grob *b)
  66 {
  67   Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), b);
  68 }
  69
  70 ADD_INTERFACE (Grid_line_interface,
  71                "A line that is spanned between grid-points.",
  72
  73                /* properties */
  74                "elements "
  75                "thickness "
  76                );
  77
  78 ADD_INTERFACE (Grid_point_interface,
  79                "A spanning point for grid lines.",
  80
  81                /* properties */
  82                ""
  83                );