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/*============================================================================
WCSLIB 7.12 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2022, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id: tlin.c,v 7.12 2022/09/09 04:57:58 mcalabre Exp $
*=============================================================================
*
* tlin tests the linear transformation routines supplied with WCSLIB.
*
*---------------------------------------------------------------------------*/
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <lin.h>
int NAXIS = 5;
int NCOORD = 2;
int NELEM = 9;
double CRPIX[5] = {256.0, 256.0, 64.0, 128.0, 1.0};
double PC[5][5] = {{ 1.0, 0.5, 0.0, 0.0, 0.0},
{ 0.5, 1.0, 0.0, 0.0, 0.0},
{ 0.0, 0.0, 1.0, 0.0, 0.0},
{ 0.0, 0.0, 0.0, 1.0, 0.0},
{ 0.0, 0.0, 0.0, 0.0, 1.0}};
double CDELT[5] = { 1.2, 2.3, 3.4, 4.5, 5.6};
double pix0[2][9] = {{303.0, 265.0, 112.4, 144.5, 28.2, 0.0, 0.0, 0.0, 0.0},
{ 19.0, 57.0, 2.0, 15.0, 42.0, 0.0, 0.0, 0.0, 0.0}};
const double tol = 1.0e-13;
int main()
{
int i, j, k, nFail, status;
double img[2][9], *pcij, pix[2][9], resid, residmax;
struct linprm lin;
printf("Testing WCSLIB linear transformation routines (tlin.c)\n"
"------------------------------------------------------\n");
// List status return messages.
printf("\nList of lin status return values:\n");
for (status = 1; status <= 6; status++) {
printf("%4d: %s.\n", status, lin_errmsg[status]);
}
lin.flag = -1;
linini(1, NAXIS, &lin);
pcij = lin.pc;
for (i = 0; i < lin.naxis; i++) {
lin.crpix[i] = CRPIX[i];
for (j = 0; j < lin.naxis; j++) {
*(pcij++) = PC[i][j];
}
lin.cdelt[i] = CDELT[i];
}
for (k = 0; k < NCOORD; k++) {
printf("\nPIX %d:", k+1);
for (j = 0; j < NAXIS; j++) {
printf("%14.8f", pix0[k][j]);
}
}
printf("\n");
if ((status = linp2x(&lin, NCOORD, NELEM, pix0[0], img[0]))) {
printf("linp2x ERROR %d\n", status);
return 1;
}
for (k = 0; k < NCOORD; k++) {
printf("\nIMG %d:", k+1);
for (j = 0; j < NAXIS; j++) {
printf("%14.8f", img[k][j]);
}
}
printf("\n");
if ((status = linx2p(&lin, NCOORD, NELEM, img[0], pix[0]))) {
printf("linx2p ERROR %d\n", status);
return 1;
}
for (k = 0; k < NCOORD; k++) {
printf("\nPIX %d:", k+1);
for (j = 0; j < NAXIS; j++) {
printf("%14.8f", pix[k][j]);
}
}
printf("\n");
// Check closure.
nFail = 0;
residmax = 0.0;
for (k = 0; k < NCOORD; k++) {
for (j = 0; j < NAXIS; j++) {
resid = fabs(pix[k][j] - pix0[k][j]);
if (residmax < resid) residmax = resid;
if (resid > tol) nFail++;
}
}
printf("\nlinp2x/linx2p: Maximum closure residual = %.1e pixel.\n",
residmax);
linfree(&lin);
if (nFail) {
printf("\nFAIL: %d closure residuals exceed reporting tolerance.\n",
nFail);
} else {
printf("\nPASS: All closure residuals are within reporting tolerance.\n");
}
return nFail;
}
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