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C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
SUBROUTINE XROTATE(RANGLE,X,Y,Z,RX,RY,RZ,INROW)
C---->
C**** XROTATE
C
C Purpose
C -------
C
C Rotate an array of (x,y,z) values about the x-axis.
C
C
C Interface
C ---------
C
C CALL XROTATE(RANGLE,X,Y,Z,RX,RY,RZ,INROW)
C
C Input
C -----
C
C RANGLE - The angle of rotation (degrees)
C (X,Y,Z) - Arrays of input (x,y,z) values.
C INROW - Number of coordinate values.
C
C
C Output
C ------
C
C (RX,RY,RZ) - Arrays of rotated (x,y,z) values.
C
C
C Method
C ------
C
C X remains unchanged.
C
C
C Externals
C ---------
C
C None.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF
C
C----<
C
IMPLICIT NONE
C
C Subroutine arguments
C
REAL RANGLE,X,Y,Z,RX,RY,RZ
DIMENSION X(*),Y(*),Z(*),RX(*),RY(*),RZ(*)
INTEGER INROW
C
C Local variables
C
REAL FACTOR, ANGLE, SINA, COSA
DATA FACTOR/0.017453293/
INTEGER LOOP
C
ANGLE = RANGLE * FACTOR
SINA = SIN(ANGLE)
COSA = COS(ANGLE)
C
DO LOOP = 1, INROW
RX(LOOP) = X(LOOP)
RY(LOOP) = Y(LOOP)*COSA + Z(LOOP)*SINA
RZ(LOOP) = -Y(LOOP)*SINA + Z(LOOP)*COSA
ENDDO
C
RETURN
END
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