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/****************************************************************************/
/* */
/* ./gps/dms.c - Convert to various position formats */
/* */
/* This file is part of gpstrans - a program to communicate with garmin gps */
/* Parts are taken from John F. Waers (jfwaers@csn.net) program MacGPS. */
/* */
/* */
/* Copyright (c) 1995 by Carsten Tschach (tschach@zedat.fu-berlin.de) */
/* */
/* Permission to use, copy, modify, and distribute this software and its */
/* documentation for non-commercial purpose, is hereby granted without fee, */
/* providing that the copyright notice appear in all copies and that both */
/* the copyright notice and this permission notice appear in supporting */
/* documentation. I make no representations about the suitability of this */
/* software for any purpose. It is provides "as is" without express or */
/* implid warranty. */
/* */
/****************************************************************************/
#include "defs.h"
#include "Garmin.h"
/****************************************************************************/
/* Convert degrees to dd mm'ss.s" (DMS-Format) */
/****************************************************************************/
char *toDMS(double a)
{
short neg = 0;
double d, m, s;
static char dms[20];
if (a < 0.0) {
a = -a;
neg = 1;
}
d = (double) ((int) a);
a = (a - d) * 60.0;
m = (double) ((int) a);
s = (a - m) * 60.0;
if (s > 59.5) {
s = 0.0;
m += 1.0;
}
if (m > 59.5) {
m = 0.0;
d += 1.0;
}
if (neg)
d = -d;
sprintf(dms, "%.0f%02.0f'%04.1f\"", d, m, s);
return dms;
}
/****************************************************************************/
/* Convert dd mm'ss.s" (DMS-Format) to degrees. */
/****************************************************************************/
double DMStoDegrees(char *dms)
{
int neg = 0;
int d, m;
double s;
sscanf(dms, "%d%d%lf", &d, &m, &s);
s = (double) (abs(d)) + ((double)m + s / 60.0) / 60.0;
if (d >= 0)
return s;
else
return -s;
}
/****************************************************************************/
/* Convert degrees to dd mm.mmm' (DMM-Format) */
/****************************************************************************/
char *toDM(double a)
{
short neg = 0;
double d, m;
static char dm[13];
if (a < 0.0) {
a = -a;
neg = 1;
}
d = (double) ( (int) a);
m = (a - d) * 60.0;
if (m > 59.5) {
m = 0.0;
d += 1.0;
}
if (neg) d = -d;
sprintf(dm, "%.0f%06.3f'", d, m);
return dm;
}
/****************************************************************************/
/* Convert dd mm.mmm' (DMM-Format) to degree. */
/****************************************************************************/
double DMtoDegrees(char *dms)
{
short neg = 0;
short d;
double m;
sscanf(dms, "%d%lf", &d, &m);
m = (double) (abs(d)) + m / 60.0;
if (d >= 0)
return m;
else
return -m;
}
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