2 moment.cc -- implement Moment
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "lily-guile.hh"
14 #include "ly-smobs.icc"
16 IMPLEMENT_SIMPLE_SMOBS (Moment);
17 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
20 Moment::mark_smob (SCM)
29 Moment::print_smob (SCM s, SCM port, scm_print_state *)
31 Moment *r = (Moment *) ly_cdr (s);
33 scm_puts ("#<Mom ", port);
34 String str = r->to_string ();
35 scm_puts ((char *)str.to_str0 (), port);
42 TODO: add optional factor argument.
44 LY_DEFINE (make_moment,"ly:make-moment", 2,0,0, (SCM n, SCM d),
45 "Create the rational number with main timing @var{n}/@var{d}. \n"
48 "Moment is a point in musical time. It is consists of a pair of\n"
49 "rationals (@var{m},@var{g}), where @var{m} is the timing for the main\n"
50 "notes, and @var{g} the timing for grace notes. In absence of grace\n"
51 "notes, @var{g} is zero.\n"
54 SCM_ASSERT_TYPE (SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
55 SCM_ASSERT_TYPE (SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
57 return Moment (Rational (gh_scm2int (n), gh_scm2int (d))).smobbed_copy ();
60 LY_DEFINE (add_moment,"ly:add-moment", 2,0,0, (SCM a, SCM b),
64 Moment * ma = unsmob_moment (a);
65 Moment * mb = unsmob_moment (b);
66 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
67 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
69 return (*ma + *mb).smobbed_copy ();
73 LY_DEFINE (mul_moment,"ly:mul-moment", 2,0,0, (SCM a, SCM b),
74 "Multiply two moments."
77 Moment * ma = unsmob_moment (a);
78 Moment * mb = unsmob_moment (b);
79 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
80 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
82 return (*ma * *mb).smobbed_copy ();
87 LY_DEFINE (div_moment,"ly:div-moment", 2,0,0, (SCM a, SCM b),
91 Moment * ma = unsmob_moment (a);
92 Moment * mb = unsmob_moment (b);
93 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
94 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
96 return (*ma / *mb).smobbed_copy ();
99 LY_DEFINE (ly_moment_less_p,"ly:moment<?", 2,0,0, (SCM a, SCM b),
100 "Compare two moments.")
102 Moment * ma = unsmob_moment (a);
103 Moment * mb = unsmob_moment (b);
104 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
105 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
107 return gh_bool2scm (*ma < *mb);
113 Moment::equal_p (SCM a, SCM b)
115 Moment *m1 = unsmob_moment (a);
116 Moment *m2 = unsmob_moment (b);
118 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
121 /****************************************************************/
124 compare (Moment const &a, Moment const &b)
126 return Moment::compare (a,b);
130 Moment::compare (Moment const &a, Moment const &b)
132 int c = Rational::compare (a.main_part_,b.main_part_);
136 return Rational::compare (a.grace_part_, b.grace_part_);
144 Moment::Moment (int m)
146 main_part_ = Rational (m);
147 grace_part_ = Rational ( 0);
150 Moment::Moment (Rational m, Rational g)
156 Moment::Moment (Rational m)
159 grace_part_ = Rational (0);
163 Moment::operator += (Moment const &src)
165 main_part_ +=src.main_part_ ;
166 grace_part_ += src.grace_part_;
169 Moment::operator -= (Moment const &src)
171 main_part_ -= src.main_part_ ;
172 grace_part_ -= src.grace_part_;
176 only take the main part of SRC for multiplication.
179 Moment::operator *= (Moment const &src)
181 main_part_ *= src.main_part_ ;
182 grace_part_ *= src.main_part_;
186 only take the main part of SRC for multiplication.
189 Moment::operator /= (Moment const &src)
191 main_part_ /= src.main_part_ ;
192 grace_part_ /= src.main_part_;
198 Moment::den () const { return main_part_.den (); }
201 Moment::num () const { return main_part_.num (); }
204 Moment::to_bool () const
206 return main_part_ || grace_part_;
210 Moment::set_infinite (int k)
212 main_part_.set_infinite (k);
217 Moment::to_string () const
219 String s = main_part_.to_string ();
222 s += "G" + grace_part_.to_string ();
228 Moment::operator - () const
231 m.grace_part_ = - grace_part_;
232 m. main_part_ = - main_part_ ;
237 #ifdef STREAM_SUPPORT
239 operator << (std::ostream &os, Moment const &m)
241 os << m.to_string ();