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SUBROUTINE slXYXY (X1,Y1,COEFFS,X2,Y2)
*+
* - - - - - -
* X Y X Y
* - - - - - -
*
* Transform one [X,Y] into another using a linear model of the type
* produced by the slFTXY routine.
*
* Given:
* X1 d x-coordinate
* Y1 d y-coordinate
* COEFFS d(6) transformation coefficients (see note)
*
* Returned:
* X2 d x-coordinate
* Y2 d y-coordinate
*
* The model relates two sets of [X,Y] coordinates as follows.
* Naming the elements of COEFFS:
*
* COEFFS(1) = A
* COEFFS(2) = B
* COEFFS(3) = C
* COEFFS(4) = D
* COEFFS(5) = E
* COEFFS(6) = F
*
* the present routine performs the transformation:
*
* X2 = A + B*X1 + C*Y1
* Y2 = D + E*X1 + F*Y1
*
* See also slFTXY, slPXY, slINVF, slDCMF
*
* P.T.Wallace Starlink 5 December 1994
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
*-
IMPLICIT NONE
DOUBLE PRECISION X1,Y1,COEFFS(6),X2,Y2
X2=COEFFS(1)+COEFFS(2)*X1+COEFFS(3)*Y1
Y2=COEFFS(4)+COEFFS(5)*X1+COEFFS(6)*Y1
END
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