[Proj] Correction and example.

[Gerald I. Evenden]

Correction to last email

proj_initstr will *not* be replaced with a macro in the near future.

--------------------------------------------------------

Example: instead of the crude example at

http://trac.osgeo.org/proj/wiki/ProjAPI

the following is a little more elegant and handles general input
data, including DMS:

#include "../lib_proj.h"
#include <stdio.h>
#define MAXLINE 1000
int main(int argc, char **argv) {
    char options[] = "proj=merc ellps=clrk66 lat_ts=33";
    char line[MAXLINE], *s;
    PROJ *P;
    PROJ_XY out;
    PROJ_LP in;

    if (!(P = proj_initstr(options))) {
	fprintf(stderr, "projection init failure\n");
	exit(1);
    }
    while (s = fgets(line, MAXLINE, stdin)) {
	in.phi = proj_dmstor(s, &s);
	in.lam = proj_dmstor(s, &s);
	out = proj_fwd(in, P);
	printf("%.2f\t%.2f\n", out.x, out.y);
    }
    exit(0);
}

Remember the mantra:

     "CARTOGRAPHIC PROJECTIONS HAVE NOTHING TO DO WITH DATUMS"

Write that on the board 200 times and you may go home.

Anyway, I've had my say and I are auta here.  TTFN

-- 
The whole religious complexion of the modern world is due
to the absence from Jerusalem of a lunatic asylum.
-- Havelock Ellis (1859-1939) British psychologist