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/**
* \file wind_format.c
*
* \brief GIS Library - Window formatting functions.
*
* (C) 2001-2008 by the GRASS Development Team
*
* This program is free software under the GNU General Public License
* (>=v2). Read the file COPYING that comes with GRASS for details.
*
* \author GRASS GIS Development Team
*
* \date 1999-2008
*/
#include <stdio.h>
#include <grass/gis.h>
static void format_double(double, char *, int);
/**
* \brief Northing to ASCII.
*
* Converts the double representation of the <b>north</b> coordinate to
* its ASCII representation (into <b>buf</b>).
*
* \param[in] north northing
* \param[in,out] buf buffer to hold formatted string
* \param[in] projection, or -1 to force full precision FP
* \return always returns 0
*/
int G_format_northing(double north, char *buf, int projection)
{
if (projection == PROJECTION_LL)
G_lat_format(north, buf);
else if (projection == -1)
format_double(north, buf, TRUE);
else
format_double(north, buf, FALSE);
return 0;
}
/**
* \brief Easting to ASCII.
*
* Converts the double representation of the <b>east</b> coordinate to
* its ASCII representation (into <b>buf</b>).
*
* \param[in] east easting
* \param[in,out] buf buffer to hold formatted string
* \param[in] projection, or -1 to force full precision FP
* \return always returns 0
*/
int G_format_easting(double east, char *buf, int projection)
{
if (projection == PROJECTION_LL)
G_lon_format(east, buf);
else if (projection == -1)
format_double(east, buf, TRUE);
else
format_double(east, buf, FALSE);
return 0;
}
/**
* \brief Resolution to ASCII.
*
* Converts the double representation of the <b>resolution</b> to its
* ASCII representation (into <b>buf</b>).
*
* \param[in] resolution
* \param[in,out] buf buffer to hold formatted string
* \param[in] projection, or -1 to force full precision FP
* \return always returns 0
*/
int G_format_resolution(double res, char *buf, int projection)
{
if (projection == PROJECTION_LL)
G_llres_format(res, buf);
else if (projection == -1)
format_double(res, buf, TRUE);
else
format_double(res, buf, FALSE);
return 0;
}
/*
* 'full_prec' is boolean, FALSE uses %.8f, TRUE uses %.15g
* The reason to have this is that for lat/lon "%.8f" is not
* enough to preserve fidelity once converted back into D:M:S,
* which leads to rounding errors, especially for resolution.
*/
static void format_double(double value, char *buf, int full_prec)
{
if (full_prec)
sprintf(buf, "%.15g", value);
else
sprintf(buf, "%.8f", value);
G_trim_decimal(buf);
return;
}
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