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* tnx.h
*
* Manage polynomials.
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
* This file part of: AstrOmatic WCS library
* Copyright: (C) 2000-2010 IAP/CNRS/UPMC
* License: GNU General Public License
* AstrOmatic software 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 3 of the
* License, or (at your option) any later version.
* AstrOmatic software 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 AstrOmatic software.
* If not, see <http://www.gnu.org/licenses/>.
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#ifndef _TNX_H_
#define _TNX_H_
/*-------------------------------- macros -----------------------------------*/
#define TNX_MAXCHARS 2048 /* Maximum FITS "WAT" string length */
/* TNX permitted types of surfaces */
#define TNX_CHEBYSHEV 1
#define TNX_LEGENDRE 2
#define TNX_POLYNOMIAL 3
/* TNX cross-terms flags */
#define TNX_XNONE 0 /* no x-terms (old no) */
#define TNX_XFULL 1 /* full x-terms (new yes) */
#define TNX_XHALF 2 /* half x-terms (new) */
/*----------------------------- Internal constants --------------------------*/
/*------------------------------- structures --------------------------------*/
typedef struct tnxaxis
{
int type; /* Projection correction type */
int xorder,yorder; /* Polynomial orders */
int xterms; /* Well... */
int ncoeff; /* Number of polynom coefficients */
double xrange,yrange; /* Coordinate ranges */
double xmaxmin,ymaxmin; /* Well... */
double *coeff; /* Polynom coefficients */
double *xbasis,*ybasis; /* Basis function values */
} tnxaxisstruct;
/*------------------------------- functions ---------------------------------*/
tnxaxisstruct *copy_tnxaxis(tnxaxisstruct *axis),
*read_tnxaxis(char *tnxstr);
double raw_to_tnxaxis(tnxaxisstruct *axis, double x, double y);
void free_tnxaxis(tnxaxisstruct *axis);
#endif