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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