lily/grid-line-interface.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "grid-line-interface.hh"
  21
  22 #include "grob.hh"
  23 #include "pointer-group-interface.hh"
  24 #include "lookup.hh"
  25 #include "output-def.hh"
  26
  27 MAKE_SCHEME_CALLBACK (Grid_line_interface, print, 1);
  28 SCM
  29 Grid_line_interface::print (SCM smobbed_me)
  30 {
  31   Grob *me = unsmob_grob (smobbed_me);
  32
  33   extract_grob_set (me, "elements", elts);
  34   /* compute common refpoint of elements */
  35   Grob *refp = common_refpoint_of_array (elts, me, Y_AXIS);
  36   Interval iv;
  37
  38   for (vsize i = 0; i < elts.size (); i++)
  39     {
  40       Grob *point = elts[i];
  41
  42       iv.unite (point->extent (refp, Y_AXIS));
  43     }
  44
  45   if (iv.is_empty ())
  46     {
  47       me->suicide ();
  48       return SCM_EOL;
  49     }
  50
  51   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  52   Real thick = robust_scm2double (me->get_property ("thickness"), 1.0)
  53     * staffline;
  54
  55   iv += -me->relative_coordinate (refp, Y_AXIS);
  56   Stencil st = Lookup::filled_box (Box (Interval (0, thick),
  57                                         iv));
  58
  59   return st.smobbed_copy ();
  60 }
  61
  62 MAKE_SCHEME_CALLBACK (Grid_line_interface, width, 1);
  63 SCM
  64 Grid_line_interface::width (SCM smob)
  65 {
  66   Grob *me = unsmob_grob (smob);
  67
  68   Real staffline = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  69   Real thick = robust_scm2double (me->get_property ("thickness"), 1.0)
  70     * staffline;
  71
  72   return ly_interval2scm (Interval (0, thick));
  73 }
  74
  75 void
  76 Grid_line_interface::add_grid_point (Grob *me, Grob *b)
  77 {
  78   Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), b);
  79 }
  80
  81 ADD_INTERFACE (Grid_line_interface,
  82                "A line that is spanned between grid-points.",
  83
  84                /* properties */
  85                "elements "
  86                "thickness "
  87                );
  88
  89 ADD_INTERFACE (Grid_point_interface,
  90                "A spanning point for grid lines.",
  91
  92                /* properties */
  93                ""
  94                );