2 moment.cc -- implement Moment
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2003 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)
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,"ly:make-moment", 2,0,0, (SCM n, SCM d),
51 "create the rational number with main timing @var{n}/@var{d}. \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"
60 SCM_ASSERT_TYPE(SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
61 SCM_ASSERT_TYPE(SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
63 return Moment (Rational (gh_scm2int (n), gh_scm2int (d))).smobbed_copy();
66 LY_DEFINE (add_moment,"ly:add-moment", 2,0,0, (SCM a, SCM b),
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");
75 return (*ma + *mb).smobbed_copy();
79 LY_DEFINE (mul_moment,"ly:mul-moment", 2,0,0, (SCM a, SCM b),
80 "Multiply two moments."
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");
88 return (*ma * *mb).smobbed_copy();
93 LY_DEFINE (div_moment,"ly:div-moment", 2,0,0, (SCM a, SCM b),
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");
102 return (*ma / *mb).smobbed_copy();
107 Moment::equal_p (SCM a, SCM b)
109 Moment *m1 = unsmob_moment (a);
110 Moment *m2 = unsmob_moment (b);
112 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
115 /****************************************************************/
118 compare (Moment const &a, Moment const &b)
120 return Moment::compare (a,b);
124 Moment::compare (Moment const &a, Moment const &b)
126 int c = Rational::compare (a.main_part_,b.main_part_);
130 return Rational::compare (a.grace_part_, b.grace_part_);
138 Moment::Moment (int m)
140 main_part_ = Rational(m);
141 grace_part_ = Rational( 0);
144 Moment::Moment (Rational m, Rational g)
150 Moment::Moment (Rational m)
153 grace_part_ = Rational (0);
157 Moment::operator += (Moment const &src)
159 main_part_ +=src.main_part_ ;
160 grace_part_ += src.grace_part_;
163 Moment::operator -= (Moment const &src)
165 main_part_ -= src.main_part_ ;
166 grace_part_ -= src.grace_part_;
170 only take the main part of SRC for multiplication.
173 Moment::operator *= (Moment const &src)
175 main_part_ *= src.main_part_ ;
176 grace_part_ *= src.main_part_;
180 only take the main part of SRC for multiplication.
183 Moment::operator /= (Moment const &src)
185 main_part_ /= src.main_part_ ;
186 grace_part_ /= src.main_part_;
191 Moment::operator Rational()
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::string () const
219 String s = main_part_.string ();
222 s += "G" + grace_part_.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)