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/*============================================================================
WCSLIB 7.7 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2021, 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: ttab3.c,v 7.7 2021/07/12 06:36:49 mcalabre Exp $
*=============================================================================
*
* ttab3 tests the -TAB routines using PGPLOT for graphical display. It
* constructs a table that approximates Bonne's projection and uses it to
* draw a graticule.
*
*---------------------------------------------------------------------------*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cpgplot.h>
#include <prj.h>
#include <tab.h>
#define K1 271
#define K2 235
int main()
{
// Set up the lookup table.
const int M = 2;
const int K[] = {K1, K2};
const int map[] = {0, 1};
const double crval[] = {135.0, 95.0};
char text[80];
int ci, i, ilat, ilng, j, k, m, stat[K2*K1], status;
float xr[361], yr[361];
double world[361][2], x[K1], xy[361][2], y[K2];
struct tabprm tab;
struct prjprm prj;
printf(
"Testing WCSLIB inverse coordinate lookup table routines (ttab3.c)\n"
"-----------------------------------------------------------------\n");
// List status return messages.
printf("\nList of tab status return values:\n");
for (status = 1; status <= 5; status++) {
printf("%4d: %s.\n", status, tab_errmsg[status]);
}
printf("\n");
// PGPLOT initialization.
strcpy(text, "/null");
cpgbeg(0, text, 1, 1);
cpgvstd();
cpgsch(0.7f);
cpgwnad(-135.0f, 135.0f, -95.0f, 140.0f);
cpgbox("BC", 0.0f, 0, "BC", 0.0f, 0);
cpgscr(0, 0.00f, 0.00f, 0.00f);
cpgscr(1, 1.00f, 1.00f, 0.00f);
cpgscr(2, 1.00f, 1.00f, 1.00f);
cpgscr(3, 0.50f, 0.50f, 0.80f);
cpgscr(4, 0.80f, 0.50f, 0.50f);
cpgscr(5, 0.80f, 0.80f, 0.80f);
cpgscr(6, 0.50f, 0.50f, 0.80f);
cpgscr(7, 0.80f, 0.50f, 0.50f);
cpgscr(8, 0.30f, 0.50f, 0.30f);
// Set up the lookup table.
tab.flag = -1;
if ((status = tabini(1, M, K, &tab))) {
printf("tabini ERROR %d: %s.\n", status, tab_errmsg[status]);
return 1;
}
tab.M = M;
for (m = 0; m < tab.M; m++) {
tab.K[m] = K[m];
tab.map[m] = map[m];
tab.crval[m] = crval[m];
for (k = 0; k < tab.K[m]; k++) {
tab.index[m][k] = (double)k;
}
}
// Set up the lookup table to approximate Bonne's projection.
for (i = 0; i < K1; i++) {
x[i] = 135 - i;
}
for (j = 0; j < K2; j++) {
y[j] = j - 95;
}
prjini(&prj);
prj.pv[1] = 35.0;
// Disable bounds checking (or alternatively, simply ignore out-of-bounds
// errors). This is necessary to provide continuity beyond the -180 and
// +180 meridians, noting that bonx2s() computes out-of-bounds values so
// as to provide continuity.
prj.bounds = 0;
status = bonx2s(&prj, K1, K2, 1, 2, x, y, tab.coord, tab.coord+1, stat);
// Draw meridians.
ci = 1;
for (ilng = -180; ilng <= 180; ilng += 15) {
if (++ci > 7) ci = 2;
cpgsci(ilng?ci:1);
for (j = 0, ilat = -90; ilat <= 90; ilat++, j++) {
world[j][0] = (double)ilng;
world[j][1] = (double)ilat;
}
// A fudge to account for the singularity at the poles.
world[0][0] = 0.0;
world[180][0] = 0.0;
status = tabs2x(&tab, 181, 2, world[0], xy[0], stat);
k = 0;
for (j = 0; j < 181; j++) {
if (stat[j]) {
if (k > 1) cpgline(k, xr, yr);
k = 0;
continue;
}
xr[k] = xy[j][0];
yr[k] = xy[j][1];
k++;
}
cpgline(k, xr, yr);
}
// Draw parallels.
ci = 1;
for (ilat = -75; ilat <= 75; ilat += 15) {
if (++ci > 7) ci = 2;
cpgsci(ilat?ci:1);
for (j = 0, ilng = -180; ilng <= 180; ilng++, j++) {
world[j][0] = (double)ilng;
world[j][1] = (double)ilat;
}
status = tabs2x(&tab, 361, 2, world[0], xy[0], stat);
k = 0;
for (j = 0; j < 361; j++) {
if (stat[j]) {
if (k > 1) cpgline(k, xr, yr);
k = 0;
continue;
}
xr[k] = xy[j][0];
yr[k] = xy[j][1];
k++;
}
cpgline(k, xr, yr);
}
cpgend();
// Defeat spurious reporting of memory leaks.
tabfree(&tab);
return 0;
}
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