source: trunk/FACT++/sofa/src/a2af.c@ 18368

Last change on this file since 18368 was 18346, checked in by tbretz, 11 years ago
File size: 6.3 KB
Line 
1#include "sofa.h"
2
3void iauA2af(int ndp, double angle, char *sign, int idmsf[4])
4/*
5** - - - - - - - -
6** i a u A 2 a f
7** - - - - - - - -
8**
9** Decompose radians into degrees, arcminutes, arcseconds, fraction.
10**
11** This function is part of the International Astronomical Union's
12** SOFA (Standards Of Fundamental Astronomy) software collection.
13**
14** Status: vector/matrix support function.
15**
16** Given:
17** ndp int resolution (Note 1)
18** angle double angle in radians
19**
20** Returned:
21** sign char '+' or '-'
22** idmsf int[4] degrees, arcminutes, arcseconds, fraction
23**
24** Called:
25** iauD2tf decompose days to hms
26**
27** Notes:
28**
29** 1) The argument ndp is interpreted as follows:
30**
31** ndp resolution
32** : ...0000 00 00
33** -7 1000 00 00
34** -6 100 00 00
35** -5 10 00 00
36** -4 1 00 00
37** -3 0 10 00
38** -2 0 01 00
39** -1 0 00 10
40** 0 0 00 01
41** 1 0 00 00.1
42** 2 0 00 00.01
43** 3 0 00 00.001
44** : 0 00 00.000...
45**
46** 2) The largest positive useful value for ndp is determined by the
47** size of angle, the format of doubles on the target platform, and
48** the risk of overflowing idmsf[3]. On a typical platform, for
49** angle up to 2pi, the available floating-point precision might
50** correspond to ndp=12. However, the practical limit is typically
51** ndp=9, set by the capacity of a 32-bit int, or ndp=4 if int is
52** only 16 bits.
53**
54** 3) The absolute value of angle may exceed 2pi. In cases where it
55** does not, it is up to the caller to test for and handle the
56** case where angle is very nearly 2pi and rounds up to 360 degrees,
57** by testing for idmsf[0]=360 and setting idmsf[0-3] to zero.
58**
59** This revision: 2013 June 18
60**
61** SOFA release 2015-02-09
62**
63** Copyright (C) 2015 IAU SOFA Board. See notes at end.
64*/
65{
66/* Hours to degrees * radians to turns */
67 const double F = 15.0 / D2PI;
68
69/* Scale then use days to h,m,s function. */
70 iauD2tf(ndp, angle*F, sign, idmsf);
71
72 return;
73
74/*----------------------------------------------------------------------
75**
76** Copyright (C) 2015
77** Standards Of Fundamental Astronomy Board
78** of the International Astronomical Union.
79**
80** =====================
81** SOFA Software License
82** =====================
83**
84** NOTICE TO USER:
85**
86** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND
87** CONDITIONS WHICH APPLY TO ITS USE.
88**
89** 1. The Software is owned by the IAU SOFA Board ("SOFA").
90**
91** 2. Permission is granted to anyone to use the SOFA software for any
92** purpose, including commercial applications, free of charge and
93** without payment of royalties, subject to the conditions and
94** restrictions listed below.
95**
96** 3. You (the user) may copy and distribute SOFA source code to others,
97** and use and adapt its code and algorithms in your own software,
98** on a world-wide, royalty-free basis. That portion of your
99** distribution that does not consist of intact and unchanged copies
100** of SOFA source code files is a "derived work" that must comply
101** with the following requirements:
102**
103** a) Your work shall be marked or carry a statement that it
104** (i) uses routines and computations derived by you from
105** software provided by SOFA under license to you; and
106** (ii) does not itself constitute software provided by and/or
107** endorsed by SOFA.
108**
109** b) The source code of your derived work must contain descriptions
110** of how the derived work is based upon, contains and/or differs
111** from the original SOFA software.
112**
113** c) The names of all routines in your derived work shall not
114** include the prefix "iau" or "sofa" or trivial modifications
115** thereof such as changes of case.
116**
117** d) The origin of the SOFA components of your derived work must
118** not be misrepresented; you must not claim that you wrote the
119** original software, nor file a patent application for SOFA
120** software or algorithms embedded in the SOFA software.
121**
122** e) These requirements must be reproduced intact in any source
123** distribution and shall apply to anyone to whom you have
124** granted a further right to modify the source code of your
125** derived work.
126**
127** Note that, as originally distributed, the SOFA software is
128** intended to be a definitive implementation of the IAU standards,
129** and consequently third-party modifications are discouraged. All
130** variations, no matter how minor, must be explicitly marked as
131** such, as explained above.
132**
133** 4. You shall not cause the SOFA software to be brought into
134** disrepute, either by misuse, or use for inappropriate tasks, or
135** by inappropriate modification.
136**
137** 5. The SOFA software is provided "as is" and SOFA makes no warranty
138** as to its use or performance. SOFA does not and cannot warrant
139** the performance or results which the user may obtain by using the
140** SOFA software. SOFA makes no warranties, express or implied, as
141** to non-infringement of third party rights, merchantability, or
142** fitness for any particular purpose. In no event will SOFA be
143** liable to the user for any consequential, incidental, or special
144** damages, including any lost profits or lost savings, even if a
145** SOFA representative has been advised of such damages, or for any
146** claim by any third party.
147**
148** 6. The provision of any version of the SOFA software under the terms
149** and conditions specified herein does not imply that future
150** versions will also be made available under the same terms and
151** conditions.
152*
153** In any published work or commercial product which uses the SOFA
154** software directly, acknowledgement (see www.iausofa.org) is
155** appreciated.
156**
157** Correspondence concerning SOFA software should be addressed as
158** follows:
159**
160** By email: sofa@ukho.gov.uk
161** By post: IAU SOFA Center
162** HM Nautical Almanac Office
163** UK Hydrographic Office
164** Admiralty Way, Taunton
165** Somerset, TA1 2DN
166** United Kingdom
167**
168**--------------------------------------------------------------------*/
169}
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