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/* headwcs.c
*/
#include <xos.h>
#include "fitsy.h"
int ft_trxlcs(lcs, x0, y0, x1, y1, direction)
FITSLinWCS lcs;
double x0;
double y0;
double *x1;
double *y1;
int direction;
{
if ( !lcs->has_wcs ) {
*x1 = x0;
*y1 = y0;
return 0;
}
if ( direction ) {
*x1 = x0 * lcs->fwd[0][0] + y0 * lcs->fwd[1][0] + lcs->fwd[2][0];
*y1 = x0 * lcs->fwd[0][1] + y0 * lcs->fwd[1][1] + lcs->fwd[2][1];
} else {
*x1 = x0 * lcs->rev[0][0] + y0 * lcs->rev[1][0] + lcs->rev[2][0];
*y1 = x0 * lcs->rev[0][1] + y0 * lcs->rev[1][1] + lcs->rev[2][1];
}
return 1;
}
int ft_trxsiz(lcs, x0, y0, x1, y1, direction)
FITSLinWCS lcs;
double x0;
double y0;
double *x1;
double *y1;
int direction;
{
if ( !lcs->has_wcs ) {
*x1 = x0;
*y1 = y0;
return 0;
}
if ( direction ) {
*x1 = x0 * lcs->fwd[0][0];
*y1 = y0 * lcs->fwd[1][1];
} else {
*x1 = x0 * lcs->rev[0][0];
*y1 = y0 * lcs->rev[1][1];
}
return 1;
}
void ft_loglcs(fits, m11, m12, m21, m22, v1, v2)
FITSHead fits;
double m11, m12, m21, m22;
double v1, v2;
{
if ( m11 != 1.0 ) ft_headsetr(fits, "LTM1_1", 0, m11, 7, NULL, 1);
if ( m12 != 0.0 ) ft_headsetr(fits, "LTM1_2", 0, m12, 7, NULL, 1);
if ( m21 != 0.0 ) ft_headsetr(fits, "LTM2_1", 0, m21, 7, NULL, 1);
if ( m22 != 1.0 ) ft_headsetr(fits, "LTM2_2", 0, m22, 7, NULL, 1);
if ( v1 != 0.0 ) ft_headsetr(fits, "LTV1" , 0, v1, 7, NULL, 1);
if ( v2 != 0.0 ) ft_headsetr(fits, "LTV2" , 0, v2, 7, NULL, 1);
}
void ft_wcslcs(fits, m11, m12, m21, m22, crv1, crv2, crp1, crp2, cun1, cun2)
FITSHead fits;
double m11, m12, m21, m22;
double crv1, crv2, crp1, crp2;
char *cun1, *cun2;
{
ft_headsets(fits, "CTYPE1" , 0, "LINEAR", NULL, 1);
ft_headsets(fits, "CTYPE2" , 0, "LINEAR", NULL, 1);
if ( crv1 != 0.0 ) ft_headsetr(fits, "CRVAL1" , 0, crv1, 7, NULL, 1);
if ( crp1 != 0.0 ) ft_headsetr(fits, "CRPIX1" , 0, crp1, 7, NULL, 1);
if ( cun1 != NULL) ft_headsets(fits, "CUNIT1" , 0, cun1, NULL, 1);
if ( crv2 != 0.0 ) ft_headsetr(fits, "CRVAL2" , 0, crv2, 7, NULL, 1);
if ( crp2 != 0.0 ) ft_headsetr(fits, "CRPIX2" , 0, crp2, 7, NULL, 1);
if ( cun2 != NULL) ft_headsets(fits, "CUNIT2" , 0, cun2, NULL, 1);
if ( m11 != 1.0 ) ft_headsetr(fits, "CD1_1", 0, m11, 7, NULL, 1);
if ( m12 != 0.0 ) ft_headsetr(fits, "CD1_2", 0, m12, 7, NULL, 1);
if ( m21 != 0.0 ) ft_headsetr(fits, "CD2_1", 0, m21, 7, NULL, 1);
if ( m22 != 1.0 ) ft_headsetr(fits, "CD2_2", 0, m22, 7, NULL, 1);
}
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