lily/stencil-scheme.cc

   1 /*
   2   stencil-scheme.cc -- implement Stencil scheme accessors
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "font-metric.hh"
  10 #include "stencil.hh"
  11
  12 /*
  13   TODO: naming add/combine.
  14  */
  15 /*
  16   UMGH. junkme!
  17
  18  */
  19 LY_DEFINE (ly_stencil_set_extent_x, "ly:stencil-set-extent!",
  20            3, 0, 0, (SCM stil, SCM axis, SCM np),
  21            "Set the extent of @var{stil} "
  22            "(@var{extent} must be a pair of numbers) "
  23            "in @var{axis} direction (0 or 1 for x- and y-axis respectively).")
  24 {
  25   Stencil *s = unsmob_stencil (stil);
  26   SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
  27   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
  28   SCM_ASSERT_TYPE (is_number_pair (np), np, SCM_ARG3, __FUNCTION__,
  29                    "number pair");
  30
  31   Interval iv = ly_scm2interval (np);
  32   s->dim_[Axis (gh_scm2int (axis))] = iv;
  33
  34   return SCM_UNDEFINED;
  35 }
  36
  37 LY_DEFINE (ly_translate_stencil_axis, "ly:stencil-translate-axis",
  38            3, 0, 0, (SCM stil, SCM amount, SCM axis),
  39            "Return a copy of @var{stil} but translated by @var{amount} in @var{axis} direction.")
  40 {
  41   Stencil *s = unsmob_stencil (stil);
  42   SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
  43   SCM_ASSERT_TYPE (gh_number_p (amount), amount, SCM_ARG2, __FUNCTION__, "number pair");
  44   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
  45
  46   SCM new_s = s->smobbed_copy ();
  47   Stencil *q = unsmob_stencil (new_s);
  48   q->translate_axis (gh_scm2double (amount), Axis (gh_scm2int (axis)));
  49   return new_s;
  50
  51 }
  52
  53 LY_DEFINE (ly_translate_stencil, "ly:stencil-translate",
  54            2, 0, 0, (SCM stil, SCM offset),
  55            "Return a @var{stil}, "
  56            "but translated by @var{offset} (a pair of numbers).")
  57 {
  58   Stencil *s = unsmob_stencil (stil);
  59   SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
  60   SCM_ASSERT_TYPE (is_number_pair (offset), offset, SCM_ARG2, __FUNCTION__, "number pair");
  61   Offset o = ly_scm2offset (offset);
  62
  63   SCM new_s = s->smobbed_copy ();
  64   Stencil *q =unsmob_stencil (new_s);
  65   q->translate (o);
  66   return new_s;
  67 }
  68
  69 LY_DEFINE (ly_stencil_get_expr, "ly:stencil-get-expr",
  70            1, 0, 0, (SCM stil),
  71            "Return the expression of @var{stil}.")
  72 {
  73   Stencil *s = unsmob_stencil (stil);
  74   SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
  75   return s->get_expr ();
  76 }
  77
  78 LY_DEFINE (ly_stencil_get_extent, "ly:stencil-extent",
  79            2, 0, 0, (SCM stil, SCM axis),
  80            "Return a pair of numbers signifying the extent of @var{stil} in "
  81            "@var{axis} direction (0 or 1 for x and y axis respectively).")
  82 {
  83   Stencil *s = unsmob_stencil (stil);
  84   SCM_ASSERT_TYPE (s, stil, SCM_ARG1, __FUNCTION__, "stencil");
  85   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
  86
  87   return ly_interval2scm (s->extent (Axis (gh_scm2int (axis))));
  88 }
  89
  90 LY_DEFINE (ly_stencil_moved_to_edge, "ly:stencil-moved-to-edge",
  91            4, 2, 0, (SCM first, SCM axis, SCM direction, SCM second,
  92                      SCM padding, SCM minimum),
  93            "Similar to @code{ly:stencil-combine-edge}, but returns "
  94            "@var{second} positioned to be next to @var{first}. ")
  95 {
  96   /*
  97     C&P from combine-at-edge.
  98    */
  99   Stencil *s1 = unsmob_stencil (first);
 100   Stencil *s2 = unsmob_stencil (second);
 101   Stencil first_stencil;
 102
 103   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
 104   SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir");
 105
 106   Real p = 0.0;
 107   if (padding != SCM_UNDEFINED)
 108     {
 109       SCM_ASSERT_TYPE (gh_number_p (padding), padding, SCM_ARG5, __FUNCTION__, "number");
 110       p = gh_scm2double (padding);
 111     }
 112   Real m = 0.0;
 113   if (minimum != SCM_UNDEFINED)
 114     {
 115       SCM_ASSERT_TYPE (gh_number_p (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
 116       m = gh_scm2double (minimum);
 117     }
 118
 119   if (s1)
 120     first_stencil = *s1;
 121
 122   if (s2)
 123     return first_stencil.moved_to_edge (Axis (gh_scm2int (axis)),
 124                                         Direction (gh_scm2int (direction)),
 125                                         *s2, p, m).smobbed_copy ();
 126   else
 127     return Stencil().smobbed_copy ();
 128 }
 129
 130
 131
 132 LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge",
 133            4, 2, 0,  (SCM first, SCM axis, SCM direction,
 134                       SCM second,
 135                       SCM padding,
 136                       SCM minimum),
 137            "Construct a stencil by putting @var{second} next to @var{first}. "
 138            "@var{axis} can be 0 (x-axis) or 1 (y-axis), "
 139            "@var{direction} can be -1 (left or down) or 1 (right or up). "
 140            "The stencils are juxtaposed with  @var{padding} as extra space. "
 141            "If this puts the reference points closer than @var{minimum}, "
 142            "they are moved by the latter amount.")
 143 {
 144   Stencil *s1 = unsmob_stencil (first);
 145   Stencil *s2 = unsmob_stencil (second);
 146   Stencil result;
 147
 148   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
 149   SCM_ASSERT_TYPE (is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir");
 150
 151   Real p = 0.0;
 152   if (padding != SCM_UNDEFINED)
 153     {
 154       SCM_ASSERT_TYPE (gh_number_p (padding), padding, SCM_ARG5, __FUNCTION__, "number");
 155       p = gh_scm2double (padding);
 156     }
 157   Real m = 0.0;
 158   if (minimum != SCM_UNDEFINED)
 159     {
 160       SCM_ASSERT_TYPE (gh_number_p (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
 161       m = gh_scm2double (minimum);
 162     }
 163
 164   if (s1)
 165     result = *s1;
 166   if (s2)
 167     result.add_at_edge (Axis (gh_scm2int (axis)),
 168                         Direction (gh_scm2int (direction)), *s2, p, m);
 169
 170   return result.smobbed_copy ();
 171 }
 172
 173 LY_DEFINE (ly_stencil_add , "ly:stencil-add",
 174            0, 0, 1, (SCM args),
 175            "Combine stencils. Takes any number of arguments.")
 176 {
 177 #define FUNC_NAME __FUNCTION__
 178   SCM_VALIDATE_REST_ARGUMENT (args);
 179
 180   Stencil result;
 181
 182   while (!SCM_NULLP (args))
 183     {
 184       Stencil *s = unsmob_stencil (gh_car (args));
 185       if (!s)
 186         SCM_ASSERT_TYPE (s, gh_car (args), SCM_ARGn, __FUNCTION__, "Stencil");
 187
 188       result.add_stencil (*s);
 189       args = gh_cdr (args);
 190     }
 191
 192   return result.smobbed_copy ();
 193 }
 194
 195 LY_DEFINE (ly_make_stencil, "ly:make-stencil",
 196            3, 0, 0,  (SCM expr, SCM xext, SCM yext),
 197            " \n"
 198            "Stencils are a device independent output expressions."
 199            "They carry two pieces of information: \n\n"
 200            "1: a specification of how to print this object. "
 201            "This specification is processed by the output backends, "
 202            " for example @file{scm/output-tex.scm}.\n\n"
 203            "2: the vertical and horizontal extents of the object.\n\n")
 204 {
 205   SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG2, __FUNCTION__, "number pair");
 206   SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG3, __FUNCTION__, "number pair");
 207
 208   Box b (ly_scm2interval (xext), ly_scm2interval (yext));
 209   Stencil s (b, expr);
 210   return s.smobbed_copy ();
 211 }
 212
 213 SCM
 214 fontify_atom (Font_metric const *met, SCM f)
 215 {
 216   if (f == SCM_EOL)
 217     return f;
 218   else
 219     return  scm_list_n (ly_symbol2scm ("fontify"),
 220                         ly_quote_scm (met->description_), f, SCM_UNDEFINED);
 221 }
 222
 223 LY_DEFINE (ly_fontify_atom,"ly:fontify-atom",
 224            2, 0, 0, (SCM met, SCM f),
 225            "Add a font selection command for the font metric @var{met} "
 226            "to @var{f}.")
 227 {
 228   SCM_ASSERT_TYPE (unsmob_metrics (met), met, SCM_ARG1, __FUNCTION__, "font metric");
 229
 230   return fontify_atom (unsmob_metrics (met), f);
 231 }
 232
 233 LY_DEFINE (ly_align_to_x, "ly:stencil-align-to!",
 234            3, 0, 0, (SCM stil, SCM axis, SCM dir),
 235            "Align @var{stil} using its own extents. "
 236            "@var{dir} is a number -1, 1 are left and right respectively. "
 237            "Other values are interpolated (so 0 means the center. ")
 238 {
 239   SCM_ASSERT_TYPE (unsmob_stencil (stil), stil, SCM_ARG1, __FUNCTION__, "stencil");
 240   SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
 241   SCM_ASSERT_TYPE (gh_number_p (dir), dir, SCM_ARG3, __FUNCTION__, "number");
 242
 243   unsmob_stencil (stil)->align_to ((Axis)gh_scm2int (axis),
 244                                    gh_scm2double (dir));
 245   return SCM_UNDEFINED;
 246 }