lily/molecule.cc

   1 /*
   2   molecule.cc -- implement Molecule
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <math.h>
  10 #include <libc-extension.hh>    // isinf
  11
  12 #include "font-metric.hh"
  13 #include "dimensions.hh"
  14 #include "interval.hh"
  15 #include "string.hh"
  16 #include "molecule.hh"
  17 #include "warn.hh"
  18
  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]) > 100 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_ = scm_list_n (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_ = scm_list_n (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, Real x)
 109 {
 110   if (empty_b())
 111     return ;
 112
 113   Interval i (extent (a));
 114   translate_axis (-i.linear_combination (x), a);
 115 }
 116
 117 /*
 118   See scheme Function.
 119  */
 120 void
 121 Molecule::add_at_edge (Axis a, Direction d, Molecule const &m, Real padding,
 122                        Real minimum)
 123 {
 124   Real my_extent= empty_b () ? 0.0 : dim_[a][d];
 125   Interval i (m.extent (a));
 126   Real his_extent;
 127   if (i.empty_b ())
 128     {
 129       programming_error ("Molecule::add_at_edge: adding empty molecule.");
 130       his_extent = 0.0;
 131     }
 132   else
 133     his_extent = i[-d];
 134
 135   Real offset = (my_extent -  his_extent)  + d*padding;
 136   if (minimum > 0  && fabs (offset) <  minimum)
 137     offset = sign (offset) * minimum;
 138
 139   Molecule toadd (m);
 140   toadd.translate_axis (offset, a);
 141   add_molecule (toadd);
 142 }
 143
 144
 145
 146 /*
 147   Hmm... maybe this is not such a good idea ; stuff can be empty,
 148   while expr_ == '()
 149  */
 150 bool
 151 Molecule::empty_b () const
 152 {
 153   return expr_ == SCM_EOL;
 154 }
 155
 156 SCM
 157 Molecule::get_expr () const
 158 {
 159   return expr_;
 160 }
 161
 162
 163
 164 Box
 165 Molecule::extent_box () const
 166 {
 167   return dim_;
 168 }
 169 IMPLEMENT_SIMPLE_SMOBS (Molecule);
 170
 171
 172 int
 173 Molecule::print_smob (SCM , SCM port, scm_print_state *)
 174 {
 175   scm_puts ("#<Molecule ", port);
 176 #if 0
 177   Molecule  *r = (Molecule *) ly_cdr (s);
 178   String string (r->to_string ());
 179   scm_puts ((char *)str.to_str0 (), port);
 180 #endif
 181   scm_puts (" >", port);
 182
 183   return 1;
 184 }
 185
 186
 187 SCM
 188 Molecule::mark_smob (SCM s)
 189 {
 190   Molecule  *r = (Molecule *) ly_cdr (s);
 191
 192   return r->expr_;
 193 }
 194
 195 IMPLEMENT_TYPE_P (Molecule, "ly:molecule?");
 196 IMPLEMENT_DEFAULT_EQUAL_P (Molecule);
 197