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", 2,2,0, (SCM n, SCM d, SCM gn, SCM gd),
45 "Create the rational number with main timing @var{n}/@var{d}, "
46 "and optional grace timin @var{gn}/@var{gd}.\n"
49 "Moment is a point in musical time. It is consists of a pair of\n"
50 "rationals (@var{m},@var{g}), where @var{m} is the timing for the main\n"
51 "notes, and @var{g} the timing for grace notes. In absence of grace\n"
52 "notes, @var{g} is zero.\n"
55 SCM_ASSERT_TYPE (SCM_INUMP (n), n, SCM_ARG1, __FUNCTION__, "integer");
56 SCM_ASSERT_TYPE (SCM_INUMP (d), d, SCM_ARG2, __FUNCTION__, "integer");
59 if (gn != SCM_UNDEFINED)
61 SCM_ASSERT_TYPE (SCM_INUMP (gn), gn, SCM_ARG3, __FUNCTION__, "integer");
62 grace_num = gh_scm2int (gn);
66 if (gd != SCM_UNDEFINED)
68 SCM_ASSERT_TYPE (SCM_INUMP (gd), gd, SCM_ARG4, __FUNCTION__, "integer");
69 grace_den = gh_scm2int (gd);
72 return Moment (Rational (gh_scm2int (n), gh_scm2int (d)),
73 Rational (grace_num, grace_den)).smobbed_copy ();
76 LY_DEFINE (add_moment,"ly:add-moment", 2,0,0, (SCM a, SCM b),
80 Moment * ma = unsmob_moment (a);
81 Moment * mb = unsmob_moment (b);
82 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
83 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
85 return (*ma + *mb).smobbed_copy ();
89 LY_DEFINE (mul_moment,"ly:mul-moment", 2,0,0, (SCM a, SCM b),
90 "Multiply two moments."
93 Moment * ma = unsmob_moment (a);
94 Moment * mb = unsmob_moment (b);
95 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
96 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
98 return (*ma * *mb).smobbed_copy ();
103 LY_DEFINE (div_moment,"ly:div-moment", 2,0,0, (SCM a, SCM b),
104 "Divide two moments."
107 Moment * ma = unsmob_moment (a);
108 Moment * mb = unsmob_moment (b);
109 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
110 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
112 return (*ma / *mb).smobbed_copy ();
115 LY_DEFINE (ly_moment_less_p,"ly:moment<?", 2,0,0, (SCM a, SCM b),
116 "Compare two moments.")
118 Moment * ma = unsmob_moment (a);
119 Moment * mb = unsmob_moment (b);
120 SCM_ASSERT_TYPE (ma, a, SCM_ARG1, __FUNCTION__, "moment");
121 SCM_ASSERT_TYPE (mb, b, SCM_ARG2, __FUNCTION__, "moment");
123 return gh_bool2scm (*ma < *mb);
129 Moment::equal_p (SCM a, SCM b)
131 Moment *m1 = unsmob_moment (a);
132 Moment *m2 = unsmob_moment (b);
134 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
137 /****************************************************************/
140 compare (Moment const &a, Moment const &b)
142 return Moment::compare (a,b);
146 Moment::compare (Moment const &a, Moment const &b)
148 int c = Rational::compare (a.main_part_,b.main_part_);
152 return Rational::compare (a.grace_part_, b.grace_part_);
160 Moment::Moment (int m)
162 main_part_ = Rational (m);
163 grace_part_ = Rational ( 0);
166 Moment::Moment (Rational m, Rational g)
172 Moment::Moment (Rational m)
175 grace_part_ = Rational (0);
179 Moment::operator += (Moment const &src)
181 main_part_ +=src.main_part_ ;
182 grace_part_ += src.grace_part_;
185 Moment::operator -= (Moment const &src)
187 main_part_ -= src.main_part_ ;
188 grace_part_ -= src.grace_part_;
192 only take the main part of SRC for multiplication.
195 Moment::operator *= (Moment const &src)
197 main_part_ *= src.main_part_ ;
198 grace_part_ *= src.main_part_;
202 only take the main part of SRC for multiplication.
205 Moment::operator /= (Moment const &src)
207 main_part_ /= src.main_part_ ;
208 grace_part_ /= src.main_part_;
214 Moment::den () const { return main_part_.den (); }
217 Moment::num () const { return main_part_.num (); }
220 Moment::to_bool () const
222 return main_part_ || grace_part_;
226 Moment::set_infinite (int k)
228 main_part_.set_infinite (k);
233 Moment::to_string () const
235 String s = main_part_.to_string ();
238 s += "G" + grace_part_.to_string ();
244 Moment::operator - () const
247 m.grace_part_ = - grace_part_;
248 m. main_part_ = - main_part_ ;
253 #ifdef STREAM_SUPPORT
255 operator << (std::ostream &os, Moment const &m)
257 os << m.to_string ();