lily/system-scheme.cc

   1 /*
   2   system-scheme.cc -- implement scheme bindings to System
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2007 Joe Neeman <joeneeman@gmail.com>
   7 */
   8
   9 #include "align-interface.hh"
  10 #include "pointer-group-interface.hh"
  11 #include "system.hh"
  12
  13
  14 LY_DEFINE (ly_system_print, "ly:system-print",
  15            1, 0, 0, (SCM system),
  16            "Draw the system and return the prob containing its"
  17            " stencil.")
  18 {
  19   Grob *me = unsmob_grob (system);
  20   System *me_system = dynamic_cast<System*> (me);
  21   SCM_ASSERT_TYPE (me, system, SCM_ARG1, __FUNCTION__, "grob");
  22
  23   return me_system->get_paper_system ();
  24 }
  25
  26 LY_DEFINE (ly_system_stretch, "ly:system-stretch",
  27            2, 0, 0, (SCM system, SCM amount_scm),
  28            "Stretch the system vertically by the given amount."
  29            "  This must be called before the system is drawn (for example"
  30            " with @code{ly:system-print}).")
  31 {
  32   Grob *me = unsmob_grob (system);
  33   Real amount = robust_scm2double (amount_scm, 0.0);
  34
  35   extract_grob_set (me, "elements", elts);
  36   for (vsize i = 0; i < elts.size (); i++)
  37     if (Align_interface::has_interface (elts[i]))
  38       {
  39         Align_interface::stretch (elts[i], amount, Y_AXIS);
  40         break;
  41       }
  42   return SCM_UNDEFINED;
  43 }