lily/moment.cc

   1 /*
   2   moment.cc --  implement Moment
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "lily-guile.hh"
  12 #include "moment.hh"
  13 #include "warn.hh"
  14 #include "ly-smobs.icc"
  15
  16 IMPLEMENT_SIMPLE_SMOBS (Moment);
  17 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
  18
  19 SCM
  20 Moment::mark_smob (SCM)
  21 {
  22   return SCM_EOL;
  23 }
  24
  25
  26 SCM
  27 Moment::smobbed_copy () const
  28 {
  29   Moment * m = new Moment (*this);
  30   return m->smobbed_self ();
  31 }
  32
  33
  34 int
  35 Moment::print_smob (SCM s, SCM port, scm_print_state *)
  36 {
  37   Moment  *r = (Moment *) ly_cdr (s);
  38
  39   scm_puts ("#<Mom ", port);
  40   String str = r->to_string ();
  41   scm_puts ((char *)str.to_str0 (), port);
  42   scm_puts (" >", port);
  43
  44   return 1;
  45 }
  46
  47 /*
  48   TODO: add optional factor argument.
  49  */
  50 LY_DEFINE (make_moment,"ly:make-moment", 2,0,0, (SCM n, SCM d),
  51            "create the rational number with main timing @var{n}/@var{d}. \n"
  52 "\n"
  53 "\n"
  54 "Moment is a point in musical time. It is consists of a pair of\n"
  55 "rationals (@var{m},@var{g}), where @var{m} is the timing for the  main\n"
  56 "notes, and @var{g} the timing for  grace notes. In absence of grace\n"
  57 "notes, @var{g} is zero.\n"
  58 )
  59 {
  60   SCM_ASSERT_TYPE(SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
  61   SCM_ASSERT_TYPE(SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
  62
  63   return Moment (Rational (gh_scm2int (n), gh_scm2int (d))).smobbed_copy();
  64 }
  65
  66 LY_DEFINE (add_moment,"ly:add-moment", 2,0,0, (SCM a, SCM b),
  67            "Add two moments."
  68 )
  69 {
  70   Moment * ma = unsmob_moment (a);
  71   Moment * mb = unsmob_moment (b);
  72   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
  73   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
  74
  75   return (*ma + *mb).smobbed_copy();
  76 }
  77
  78
  79 LY_DEFINE (mul_moment,"ly:mul-moment", 2,0,0, (SCM a, SCM b),
  80            "Multiply two moments."
  81 )
  82 {
  83   Moment * ma = unsmob_moment (a);
  84   Moment * mb = unsmob_moment (b);
  85   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
  86   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
  87
  88   return (*ma *  *mb).smobbed_copy();
  89 }
  90
  91
  92
  93 LY_DEFINE (div_moment,"ly:div-moment", 2,0,0, (SCM a, SCM b),
  94            "Divide two moments."
  95 )
  96 {
  97   Moment * ma = unsmob_moment (a);
  98   Moment * mb = unsmob_moment (b);
  99   SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
 100   SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
 101
 102   return (*ma /  *mb).smobbed_copy();
 103 }
 104
 105
 106
 107 SCM
 108 Moment::equal_p (SCM a, SCM b)
 109 {
 110   Moment *m1 = unsmob_moment (a);
 111   Moment *m2 = unsmob_moment (b);
 112
 113   return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
 114 }
 115
 116 /****************************************************************/
 117
 118 int
 119 compare (Moment const &a, Moment const &b)
 120 {
 121   return Moment::compare (a,b);
 122 }
 123
 124 int
 125 Moment::compare (Moment const &a, Moment const &b)
 126 {
 127   int c = Rational::compare (a.main_part_,b.main_part_);
 128   if (c)
 129     return c;
 130
 131   return Rational::compare (a.grace_part_, b.grace_part_);
 132 }
 133
 134 Moment::Moment ()
 135 {
 136
 137 }
 138
 139 Moment::Moment (int m)
 140 {
 141   main_part_ = Rational(m);
 142   grace_part_  = Rational( 0);
 143 }
 144
 145 Moment::Moment (Rational m, Rational g)
 146 {
 147   main_part_ = m;
 148   grace_part_  = g;
 149 }
 150
 151 Moment::Moment (Rational m)
 152 {
 153   main_part_ = m;
 154   grace_part_  = Rational (0);
 155 }
 156
 157 void
 158 Moment::operator += (Moment const &src)
 159 {
 160   main_part_ +=src.main_part_ ;
 161   grace_part_ += src.grace_part_;
 162 }
 163 void
 164 Moment::operator -= (Moment const &src)
 165 {
 166   main_part_ -= src.main_part_ ;
 167   grace_part_ -= src.grace_part_;
 168 }
 169
 170 /*
 171   only take the main part of SRC for multiplication.
 172  */
 173 void
 174 Moment::operator *= (Moment const &src)
 175 {
 176   main_part_ *= src.main_part_ ;
 177   grace_part_ *= src.main_part_;
 178 }
 179
 180 /*
 181   only take the main part of SRC for multiplication.
 182  */
 183 void
 184 Moment::operator /= (Moment const &src)
 185 {
 186   main_part_ /= src.main_part_ ;
 187   grace_part_ /= src.main_part_;
 188 }
 189
 190
 191 #if 0
 192 Moment::operator Rational()
 193 {
 194   return main_part_;
 195 }
 196 #endif
 197
 198 int
 199 Moment::den () const { return main_part_.den (); }
 200
 201 int
 202 Moment::num () const { return main_part_.num (); }
 203
 204 bool
 205 Moment::to_bool () const
 206 {
 207   return main_part_ || grace_part_;
 208 }
 209
 210 void
 211 Moment::set_infinite (int k)
 212 {
 213   main_part_.set_infinite (k);
 214 }
 215
 216
 217 String
 218 Moment::to_string () const
 219 {
 220   String s =  main_part_.to_string ();
 221   if (grace_part_)
 222     {
 223       s += "G" + grace_part_.to_string ();
 224     }
 225   return s;
 226 }
 227
 228 Moment
 229 Moment::operator - () const
 230 {
 231   Moment m;
 232   m.grace_part_ = - grace_part_;
 233   m. main_part_ = - main_part_ ;
 234   return m;
 235 }
 236
 237
 238 #ifdef STREAM_SUPPORT
 239 std::ostream &
 240 operator << (std::ostream &os, Moment const &m)
 241 {
 242   os << m.to_string ();
 243   return os;
 244 }
 245 #endif