lily/grob-scheme.cc

   1 #include "grob.hh"
   2 #include "warn.hh"
   3 #include "spanner.hh"
   4 #include "item.hh"
   5 #include "paper-def.hh"
   6 #include "system.hh"
   7
   8
   9 LY_DEFINE (ly_set_grob_property,"ly:set-grob-property!", 3, 0, 0,
  10   (SCM grob, SCM sym, SCM val),
  11   "Set @var{sym} in grob @var{grob} to value @var{val}")
  12 {
  13   Grob * sc = unsmob_grob (grob);
  14   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  15   SCM_ASSERT_TYPE (gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  16
  17   if (!type_check_assignment (sym, val, ly_symbol2scm ("backend-type?")))
  18     error ("typecheck failed");
  19
  20   sc->internal_set_grob_property (sym, val);
  21   return SCM_UNSPECIFIED;
  22 }
  23
  24 LY_DEFINE (ly_get_grob_property,
  25           "ly:get-grob-property", 2, 0, 0, (SCM grob, SCM sym),
  26           "Get the value of a value in grob @var{g} of property @var{sym}. It\n"
  27 "will return @code{'()} (end-of-list) if @var{g} doesn't have @var{sym} set.\n"
  28 "\n"
  29 "Grob properties are stored as GUILE association lists, with symbols as\n"
  30 "keys. All lookup functions identify undefined properties with\n"
  31 "end-of-list (i.e. @code{'()} in Scheme or @code{SCM_EOL} in C)\n"
  32 "\n"
  33 "Properties are stored in two ways:\n"
  34 "@itemize @bullet\n"
  35 "@item mutable properties.\n"
  36 "Grob properties that change from object to object. The storage of\n"
  37 "these are private to a grob. For example pointers to other grobs are\n"
  38 "always stored in the mutable properties.\n"
  39 "\n"
  40 "@item immutable properties.\n"
  41 "Grob properties that are shared across different grobs of the same\n"
  42 "type. The storage is shared, and hence it is read-only. Typically, this\n"
  43 "is used to store function callbacks, and default settings. They are\n"
  44 "initially read from @file{scm/grob-description.scm}.\n"
  45 "@end itemize\n"
  46 "\n")
  47 {
  48   Grob * sc = unsmob_grob (grob);
  49   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  50   SCM_ASSERT_TYPE (gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  51
  52   return sc->internal_get_grob_property (sym);
  53 }
  54
  55 LY_DEFINE (spanner_get_bound, "ly:get-spanner-bound", 2 , 0, 0,
  56            (SCM slur, SCM dir),
  57            "Get one of the bounds of @var{spanner}. @var{dir} is @code{-1} "
  58            "for left, and @code{1} for right.")
  59 {
  60   Spanner * sl = dynamic_cast<Spanner*> (unsmob_grob (slur));
  61   SCM_ASSERT_TYPE (sl, slur, SCM_ARG1, __FUNCTION__, "spanner grob");
  62   SCM_ASSERT_TYPE (is_direction (dir), slur, SCM_ARG2, __FUNCTION__, "dir");
  63   return sl->get_bound (to_dir (dir))->self_scm ();
  64 }
  65
  66 /* TODO: make difference between scaled and unscalead variable in
  67    calling (i.e different funcs.) */
  68 LY_DEFINE (ly_get_paper_var,"ly:get-paper-variable", 2, 0, 0,
  69   (SCM grob, SCM sym),
  70   "Get a variable from the \\paper block.")
  71 {
  72   Grob * sc = unsmob_grob (grob);
  73   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  74   SCM_ASSERT_TYPE (gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  75
  76   return sc->get_paper () ->lookup_variable (sym);
  77 }
  78
  79 /* TODO: make difference between scaled and unscalead variable in
  80    calling (i.e different funcs.) */
  81 LY_DEFINE (ly_grob_paper,"ly:grob-paper", 1, 0, 0,
  82   (SCM grob),
  83   "Get \\paper definition from a grob.")
  84 {
  85   Grob * sc = unsmob_grob (grob);
  86   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  87
  88   return sc->get_paper ()->self_scm ();
  89 }
  90
  91
  92
  93
  94 LY_DEFINE (ly_get_extent, "ly:get-extent", 3, 0, 0,
  95            (SCM grob, SCM refp, SCM axis),
  96            "Get the extent in @var{axis} direction of @var{grob} relative to "
  97            "the grob @var{refp}")
  98 {
  99   Grob * sc = unsmob_grob (grob);
 100   Grob * ref = unsmob_grob (refp);
 101   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
 102   SCM_ASSERT_TYPE (ref, refp, SCM_ARG2, __FUNCTION__, "grob");
 103
 104   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
 105
 106   return ly_interval2scm ( sc->extent (ref, Axis (gh_scm2int (axis))));
 107 }
 108
 109 LY_DEFINE (ly_get_parent, "ly:get-parent", 2, 0, 0, (SCM grob, SCM axis),
 110            "Get the parent of @var{grob}.  @var{axis} is 0 for the X-axis, "
 111            "1 for the Y-axis.")
 112 {
 113   Grob * sc = unsmob_grob (grob);
 114   SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
 115   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
 116
 117   Grob * par = sc->get_parent (Axis (gh_scm2int (axis)));
 118   return par ? par->self_scm () : SCM_EOL;
 119 }
 120
 121 LY_DEFINE (ly_get_system,
 122            "ly:get-system",
 123            1, 0, 0, (SCM grob),
 124            "Return the System Grob of @var{grob}.")
 125 {
 126   Grob *me = unsmob_grob (grob);
 127   SCM_ASSERT_TYPE (me, grob, SCM_ARG1, __FUNCTION__, "grob");
 128
 129   if (System *g = me->get_system ())
 130     return g->self_scm ();
 131
 132   return SCM_EOL;
 133 }
 134
 135 LY_DEFINE (ly_get_original,
 136            "ly:get-original",
 137            1, 0, 0, (SCM grob),
 138            "Return the original Grob of @var{grob}")
 139 {
 140   Grob *me = unsmob_grob (grob);
 141   SCM_ASSERT_TYPE (me, grob, SCM_ARG1, __FUNCTION__, "grob");
 142   return me->original_ ? me->original_->self_scm () : me->self_scm ();
 143 }
 144
 145
 146 /* ly prefix? spanner in name? */
 147 /* TODO: maybe we should return a vector -- random access is more
 148   logical for this list? */
 149
 150 LY_DEFINE (get_broken_into,
 151           "ly:get-broken-into", 1, 0, 0, (SCM spanner),
 152            "Return broken-into list for @var{spanner}.")
 153 {
 154   ///  Spanner *me = unsmob_spanner (spanner);
 155   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (spanner));
 156   SCM_ASSERT_TYPE (me, spanner, SCM_ARG1, __FUNCTION__, "spanner");
 157
 158   SCM s = SCM_EOL;
 159   for (int i = me->broken_intos_.size (); i; i--)
 160     s = gh_cons (me->broken_intos_[i-1]->self_scm (), s);
 161   return s;
 162 }
 163
 164
 165 LY_DEFINE (ly_grob_suicide,
 166           "ly:grob-suicide", 1, 0, 0, (SCM g),
 167            "Kill @var{g}.")
 168 {
 169   Grob *me = unsmob_grob (g);
 170   SCM_ASSERT_TYPE (me, g, SCM_ARG1, __FUNCTION__, "grob");
 171
 172   me->suicide ();
 173   return SCM_UNDEFINED;
 174 }
 175
 176
 177
 178 LY_DEFINE (ly_grob_translate_axis_x,
 179           "ly:grob-translate-axis!", 3, 0, 0,
 180            (SCM g, SCM d, SCM a),
 181            "Translate @var{g} on axis @var{a} over distance @var{d}.")
 182 {
 183   Grob *me = unsmob_grob (g);
 184   SCM_ASSERT_TYPE (me, g, SCM_ARG1, __FUNCTION__, "grob");
 185   SCM_ASSERT_TYPE (gh_number_p (d), d, SCM_ARG2, __FUNCTION__, "dimension");
 186   SCM_ASSERT_TYPE (is_axis (a), a, SCM_ARG3, __FUNCTION__, "axis");
 187
 188   me->translate_axis (gh_scm2double (d),
 189                       Axis (gh_scm2int (a)));
 190   return SCM_UNDEFINED;
 191 }
 192