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67 lines
1.8 KiB
Fortran
67 lines
1.8 KiB
Fortran
SUBROUTINE sla_XY2XY (X1,Y1,COEFFS,X2,Y2)
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*+
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* - - - - - -
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* X Y 2 X Y
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* - - - - - -
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*
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* Transform one [X,Y] into another using a linear model of the type
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* produced by the sla_FITXY routine.
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*
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* Given:
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* X1 d x-coordinate
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* Y1 d y-coordinate
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* COEFFS d(6) transformation coefficients (see note)
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*
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* Returned:
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* X2 d x-coordinate
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* Y2 d y-coordinate
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*
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* The model relates two sets of [X,Y] coordinates as follows.
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* Naming the elements of COEFFS:
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*
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* COEFFS(1) = A
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* COEFFS(2) = B
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* COEFFS(3) = C
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* COEFFS(4) = D
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* COEFFS(5) = E
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* COEFFS(6) = F
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*
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* the present routine performs the transformation:
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*
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* X2 = A + B*X1 + C*Y1
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* Y2 = D + E*X1 + F*Y1
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*
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* See also sla_FITXY, sla_PXY, sla_INVF, sla_DCMPF
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*
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* P.T.Wallace Starlink 5 December 1994
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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DOUBLE PRECISION X1,Y1,COEFFS(6),X2,Y2
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X2=COEFFS(1)+COEFFS(2)*X1+COEFFS(3)*Y1
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Y2=COEFFS(4)+COEFFS(5)*X1+COEFFS(6)*Y1
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END
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