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Last change
on this file since 9022 was 731, checked in by tbretz, 25 years ago |
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File size:
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| 1 | #include "slalib.h"
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| 2 | #include "slamac.h"
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| 3 | double slaDrange ( double angle )
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| 4 | /*
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| 5 | ** - - - - - - - - - -
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| 6 | ** s l a D r a n g e
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| 7 | ** - - - - - - - - - -
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| 8 | **
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| 9 | ** Normalize angle into range +/- pi.
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| 10 | **
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| 11 | ** (double precision)
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| 12 | **
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| 13 | ** Given:
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| 14 | ** angle double the angle in radians
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| 15 | **
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| 16 | ** The result is angle expressed in the +/- pi (double precision).
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| 17 | **
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| 18 | ** Defined in slamac.h: DPI, D2PI, dmod
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| 19 | **
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| 20 | ** Last revision: 19 March 1996
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| 21 | **
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| 22 | ** Copyright P.T.Wallace. All rights reserved.
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| 23 | */
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| 24 | {
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| 25 | double w;
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| 26 |
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| 27 | w = dmod ( angle, D2PI );
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| 28 | return ( fabs ( w ) < DPI ) ? w : w - dsign ( D2PI, angle );
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| 29 | }
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