wind_format.c

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#include <stdio.h>
#include <grass/gis.h>


static void format_double(double, char *, int);


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;
}


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;
}


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;
}