lily/molecule.cc

   1 /*
   2   molecule.cc -- implement Molecule
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <math.h>
  10 #include <libc-extension.hh>
  11
  12 #include "font-metric.hh"
  13 #include "dimensions.hh"
  14 #include "interval.hh"
  15 #include "string.hh"
  16 #include "molecule.hh"
  17 #include "debug.hh"
  18 #include "killing-cons.tcc"
  19
  20 #include "ly-smobs.icc"
  21
  22
  23 SCM
  24 Molecule::smobbed_copy () const
  25 {
  26   Molecule * m = new Molecule (*this);
  27
  28   return m->smobbed_self ();
  29 }
  30
  31 Interval
  32 Molecule::extent (Axis a) const
  33 {
  34   return dim_[a];
  35 }
  36
  37 Molecule::Molecule (Box b, SCM func)
  38 {
  39   expr_ = func;
  40   dim_ = b;
  41 }
  42
  43 Molecule::Molecule ()
  44 {
  45   expr_ = SCM_EOL;
  46   set_empty (true);
  47 }
  48
  49 void
  50 Molecule::translate (Offset o)
  51 {
  52   Axis a = X_AXIS;
  53   while (a < NO_AXES)
  54     {
  55       if (abs (o[a]) > 30 CM
  56           || isinf (o[a]) || isnan (o[a]))
  57         {
  58           programming_error ("Improbable offset for translation: setting to zero");
  59           o[a] =  0.0;
  60         }
  61       incr (a);
  62     }
  63
  64   expr_ = gh_list (ly_symbol2scm ("translate-molecule"),
  65                    ly_offset2scm (o),
  66                    expr_, SCM_UNDEFINED);
  67   if (!empty_b ())
  68     dim_.translate (o);
  69 }
  70
  71
  72 void
  73 Molecule::translate_axis (Real x,Axis a)
  74 {
  75   Offset o (0,0);
  76   o[a] = x;
  77   translate (o);
  78 }
  79
  80
  81
  82 void
  83 Molecule::add_molecule (Molecule const &m)
  84 {
  85   expr_ = gh_list (ly_symbol2scm ("combine-molecule"),
  86                    m.expr_,
  87                    expr_, SCM_UNDEFINED);
  88   dim_.unite (m.dim_);
  89 }
  90
  91 void
  92 Molecule::set_empty (bool e)
  93 {
  94   if (e)
  95     {
  96       dim_[X_AXIS].set_empty ();
  97       dim_[Y_AXIS].set_empty ();
  98     }
  99   else
 100     {
 101       dim_[X_AXIS] = Interval (0,0);
 102       dim_[Y_AXIS] = Interval (0,0);
 103     }
 104 }
 105
 106
 107 void
 108 Molecule::align_to (Axis a, Direction d)
 109 {
 110   Interval i (extent (a));
 111   Real r = (d == CENTER) ? i.center () : i[d];
 112   translate_axis (-r, a);
 113 }
 114
 115 void
 116 Molecule::add_at_edge (Axis a, Direction d, Molecule const &m, Real padding)
 117 {
 118   Real my_extent= empty_b () ? 0.0 : dim_[a][d];
 119   Interval i (m.extent (a));
 120   Real his_extent;
 121   if (i.empty_b ())
 122     {
 123       programming_error ("Molecule::add_at_edge: adding empty molecule.");
 124       his_extent = 0.0;
 125     }
 126   else
 127     his_extent = i[-d];
 128
 129   Real offset = my_extent -  his_extent;
 130   Molecule toadd (m);
 131   toadd.translate_axis (offset + d * padding, a);
 132   add_molecule (toadd);
 133 }
 134
 135
 136
 137
 138 bool
 139 number_pair_p (SCM p)
 140 {
 141   return gh_pair_p (p) && gh_number_p (gh_car (p)) && gh_number_p (gh_cdr (p));
 142 }
 143
 144 bool
 145 axis_p (SCM a)
 146 {
 147   return gh_number_p (a) && (gh_scm2int (a) == 0 || gh_scm2int (a) == 1);
 148 }
 149
 150 SCM
 151 Molecule::ly_set_molecule_extent_x (SCM mol, SCM axis, SCM np)
 152 {
 153   Molecule* m = unsmob_molecule (mol);
 154   if (m && axis_p (axis) && number_pair_p (np))
 155     {
 156       Interval iv = ly_scm2interval (np);
 157       m->dim_[Axis (gh_scm2int (axis))] = ly_scm2interval (np);
 158     }
 159   else
 160     warning ("ly-set-molecule-extent!: invalid arguments");
 161   return SCM_UNDEFINED;
 162 }
 163
 164 SCM
 165 Molecule::ly_get_molecule_extent (SCM mol, SCM axis)
 166 {
 167   Molecule *m = unsmob_molecule (mol);
 168
 169   if (!m || !axis_p (axis))
 170     {
 171       warning ("ly-get-molecule-extent: invalid arguments");
 172       return ly_interval2scm (Interval (0,0));
 173     }
 174
 175   return ly_interval2scm (m->extent (Axis (gh_scm2int (axis))));
 176 }
 177
 178
 179 SCM
 180 Molecule::ly_molecule_combined_at_edge (SCM first, SCM axis, SCM direction,
 181                            SCM second, SCM padding)
 182
 183 {
 184   Molecule * m1 = unsmob_molecule (first);
 185   Molecule * m2 = unsmob_molecule (second);
 186   Molecule result;
 187
 188   if (!m1 || !m2 || !isdir_b (direction) || !axis_p (axis) || !gh_number_p (padding))
 189     {
 190       warning ("ly-combine-molecule-at-edge: invalid arguments");
 191       Molecule r;
 192       return  r.smobbed_copy ();
 193     }
 194
 195   result = *m1;
 196
 197   result.add_at_edge (Axis (gh_scm2int (axis)), Direction (gh_scm2int (direction)),
 198                       *m2, gh_scm2double (padding));
 199
 200   return result.smobbed_copy ();
 201 }
 202
 203
 204 SCM
 205 make_molecule (SCM expr, SCM xext, SCM yext)
 206 {
 207   /*
 208     TODO: typechecking.
 209    */
 210   Box b (ly_scm2interval (xext), ly_scm2interval(yext));
 211   Molecule m (b, expr);
 212   return m.smobbed_copy ();
 213 }
 214
 215
 216 static void
 217 molecule_init ()
 218 {
 219   scm_make_gsubr ("ly-make-molecule", 3, 0, 0, (Scheme_function_unknown) make_molecule);
 220   scm_make_gsubr ("ly-combine-molecule-at-edge", 5 , 0, 0, (Scheme_function_unknown) Molecule::ly_molecule_combined_at_edge);
 221   scm_make_gsubr ("ly-set-molecule-extent!", 3 , 0, 0, (Scheme_function_unknown) Molecule::ly_set_molecule_extent_x);
 222   scm_make_gsubr ("ly-get-molecule-extent", 2 , 0, 0, (Scheme_function_unknown) Molecule::ly_get_molecule_extent);
 223 }
 224 ADD_SCM_INIT_FUNC (molecule,molecule_init);
 225
 226
 227 bool
 228 Molecule::empty_b () const
 229 {
 230   return expr_ == SCM_EOL;
 231 }
 232
 233 SCM
 234 fontify_atom (Font_metric * met, SCM f)
 235 {
 236   if (f == SCM_EOL)
 237     return f;
 238   else
 239     return  gh_list (ly_symbol2scm ("fontify"),
 240                      ly_quote_scm (met->description_), f, SCM_UNDEFINED);
 241 }
 242
 243 SCM
 244 Molecule::get_expr () const
 245 {
 246   return expr_;
 247 }
 248
 249
 250
 251 Box
 252 Molecule::extent_box () const
 253 {
 254   return dim_;
 255 }
 256 IMPLEMENT_SIMPLE_SMOBS (Molecule);
 257
 258
 259 int
 260 Molecule::print_smob (SCM s, SCM port, scm_print_state *)
 261 {
 262   Molecule  *r = (Molecule *) gh_cdr (s);
 263
 264   scm_puts ("#<Molecule ", port);
 265   /*  String str (r->str ());
 266   scm_puts ((char *)str.ch_C (), port);*/
 267   scm_puts (" >", port);
 268
 269   return 1;
 270 }
 271
 272
 273 SCM
 274 Molecule::mark_smob (SCM s)
 275 {
 276   Molecule  *r = (Molecule *) gh_cdr (s);
 277
 278   return r->expr_;
 279 }
 280
 281 IMPLEMENT_TYPE_P (Molecule, "molecule?");
 282 IMPLEMENT_DEFAULT_EQUAL_P (Molecule);
 283 IMPLEMENT_UNSMOB (Molecule, molecule);