2 moment.cc -- implement Moment
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2002 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, "moment?");
20 Moment::mark_smob (SCM)
27 Moment::smobbed_copy () const
29 Moment * m = new Moment (*this);
30 return m->smobbed_self ();
35 Moment::print_smob (SCM s, SCM port, scm_print_state *)
37 Moment *r = (Moment *) ly_cdr (s);
39 scm_puts ("#<Mom ", port);
40 String str = r->string ();
41 scm_puts ((char *)str.to_str0 (), port);
42 scm_puts (" >", port);
48 TODO: add optional factor argument.
50 LY_DEFINE (make_moment,"make-moment", 2,0,0, (SCM n, SCM d),
51 "create the rational number with main timing @var{n}/@var{d}.
54 Moment is a point in musical time. It is consists of a pair of
55 rationals (@var{m},@var{g}), where @var{m} is the timing for the main
56 notes, and @var{g} the timing for grace notes. In absence of grace
57 notes, @var{g} is zero.
60 Moment m (Rational (1,1));
62 if (SCM_INUMP (n) && SCM_INUMP (d))
64 m = Moment (Rational (gh_scm2int (n), gh_scm2int (d)));
68 ::error ("make-moment takes two integer arguments. Using 1/1");
71 return m.smobbed_copy ();
75 Moment::equal_p (SCM a, SCM b)
77 Moment *m1 = unsmob_moment (a);
78 Moment *m2 = unsmob_moment (b);
80 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
83 /****************************************************************/
86 compare (Moment const &a, Moment const &b)
88 return Moment::compare (a,b);
92 Moment::compare (Moment const &a, Moment const &b)
94 int c = Rational::compare (a.main_part_,b.main_part_);
98 return Rational::compare (a.grace_part_, b.grace_part_);
106 Moment::Moment (int m)
108 main_part_ = Rational(m);
109 grace_part_ = Rational( 0);
112 Moment::Moment (Rational m, Rational g)
118 Moment::Moment (Rational m)
121 grace_part_ = Rational (0);
125 Moment::operator += (Moment const &src)
127 main_part_ +=src.main_part_ ;
128 grace_part_ += src.grace_part_;
131 Moment::operator -= (Moment const &src)
133 main_part_ -= src.main_part_ ;
134 grace_part_ -= src.grace_part_;
138 only take the main part of SRC for multiplication.
141 Moment::operator *= (Moment const &src)
143 main_part_ *= src.main_part_ ;
144 grace_part_ *= src.main_part_;
148 only take the main part of SRC for multiplication.
151 Moment::operator /= (Moment const &src)
153 main_part_ /= src.main_part_ ;
154 grace_part_ /= src.main_part_;
159 Moment::operator Rational()
166 Moment::den () const { return main_part_.den (); }
169 Moment::num () const { return main_part_.num (); }
172 Moment::to_bool () const
174 return main_part_ || grace_part_;
178 Moment::set_infinite (int k)
180 main_part_.set_infinite (k);
185 Moment::string () const
187 String s = main_part_.string ();
190 s += "G" + grace_part_.string ();
196 Moment::operator - () const
199 m.grace_part_ = - grace_part_;
200 m. main_part_ = - main_part_ ;
205 #ifdef STREAM_SUPPORT
207 operator << (std::ostream &os, Moment const &m)