lily/molecule.cc

   1 /*
   2   molecule.cc -- implement Molecule
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 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 bool
 136 Molecule::empty_b () const
 137 {
 138   return expr_ == SCM_EOL;
 139 }
 140
 141 SCM
 142 fontify_atom(Font_metric * met, SCM f)
 143 {
 144   if (f == SCM_EOL)
 145     return f;
 146   else
 147     return  gh_list (ly_symbol2scm ("fontify"),
 148                      ly_quote_scm (met->description_), f, SCM_UNDEFINED);
 149 }
 150
 151 SCM
 152 Molecule::get_expr () const
 153 {
 154   return expr_;
 155 }
 156
 157
 158
 159 Box
 160 Molecule::extent_box () const
 161 {
 162   return dim_;
 163 }
 164 IMPLEMENT_SIMPLE_SMOBS(Molecule);
 165
 166
 167 int
 168 Molecule::print_smob (SCM s, SCM port, scm_print_state *)
 169 {
 170   Molecule  *r = (Molecule *) gh_cdr (s);
 171
 172   scm_puts ("#<Molecule ", port);
 173   /*  String str(r->str());
 174   scm_puts ((char *)str.ch_C(), port);*/
 175   scm_puts (" >", port);
 176
 177   return 1;
 178 }
 179
 180
 181 SCM
 182 Molecule::mark_smob (SCM s)
 183 {
 184   Molecule  *r = (Molecule *) gh_cdr (s);
 185
 186   return r->expr_;
 187 }
 188
 189 IMPLEMENT_TYPE_P(Molecule, "molecule?");
 190 IMPLEMENT_DEFAULT_EQUAL_P(Molecule);
 191 IMPLEMENT_UNSMOB(Molecule, molecule);