mirror of
https://github.com/eddyem/apogee_control.git
synced 2025-12-06 10:45:20 +03:00
50 lines
1.5 KiB
Fortran
50 lines
1.5 KiB
Fortran
DOUBLE PRECISION FUNCTION sla_DRANGE (ANGLE)
|
|
*+
|
|
* - - - - - - -
|
|
* D R A N G E
|
|
* - - - - - - -
|
|
*
|
|
* Normalize angle into range +/- pi (double precision)
|
|
*
|
|
* Given:
|
|
* ANGLE dp the angle in radians
|
|
*
|
|
* The result (double precision) is ANGLE expressed in the range +/- pi.
|
|
*
|
|
* P.T.Wallace Starlink 23 November 1995
|
|
*
|
|
* Copyright (C) 1995 Rutherford Appleton Laboratory
|
|
*
|
|
* License:
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (see SLA_CONDITIONS); if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
|
|
* Boston, MA 02111-1307 USA
|
|
*
|
|
*-
|
|
|
|
IMPLICIT NONE
|
|
|
|
DOUBLE PRECISION ANGLE
|
|
|
|
DOUBLE PRECISION DPI,D2PI
|
|
PARAMETER (DPI=3.141592653589793238462643D0)
|
|
PARAMETER (D2PI=6.283185307179586476925287D0)
|
|
|
|
|
|
sla_DRANGE=MOD(ANGLE,D2PI)
|
|
IF (ABS(sla_DRANGE).GE.DPI)
|
|
: sla_DRANGE=sla_DRANGE-SIGN(D2PI,ANGLE)
|
|
|
|
END
|