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1 | #include "slalib.h"
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2 | #include "slamac.h"
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3 | void slaXy2xy ( double xc1, double yc1, double coeffs[6],
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4 | double *xc2, double *yc2 )
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5 | /*
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6 | ** - - - - - - - - -
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7 | ** s l a X y 2 x y
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8 | ** - - - - - - - - -
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9 | **
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10 | ** Transform one [x,y] into another using a linear model of the type
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11 | ** produced by the slaFitxy routine.
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12 | **
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13 | ** Given:
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14 | ** xc1 double x-coordinate
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15 | ** yc1 double y-coordinate
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16 | ** coeffs double[6] transformation coefficients (see note)
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17 | **
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18 | ** Returned:
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19 | ** *xc2 double x-coordinate
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20 | ** *yc2 double y-coordinate
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21 | **
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22 | ** The model relates two sets of [x,y] coordinates as follows.
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23 | ** Naming the elements of coeffs:
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24 | **
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25 | ** coeffs[0] = a
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26 | ** coeffs[1] = b
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27 | ** coeffs[2] = c
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28 | ** coeffs[3] = d
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29 | ** coeffs[4] = e
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30 | ** coeffs[5] = f
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31 | **
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32 | ** the present routine performs the transformation:
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33 | **
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34 | ** xc2 = a + b*xc1 + c*yc1
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35 | ** yc2 = d + e*xc1 + f*yc1
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36 | **
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37 | ** See also slaFitxy, slaPxy, slaInvf, slaDcmpf.
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38 | **
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39 | ** Last revision: 5 December 1994
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40 | **
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41 | ** Copyright P.T.Wallace. All rights reserved.
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42 | */
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43 | {
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44 | *xc2 = coeffs[0] + coeffs[1] * xc1 + coeffs[2] * yc1;
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45 | *yc2 = coeffs[3] + coeffs[4] * xc1 + coeffs[5] * yc1;
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46 | }
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