lwprint_normalize_latlon()

static void lwprint_normalize_latlon ( double *  lat, double *  lon  )

static

Definition at line 34 of file lwprint.c.

Referenced by lwdoubles_to_latlon().

{
        /* First remove all the truly excessive trips around the world via up or down. */
        while (*lat > 270)
        {
                *lat -= 360;
        }
        while (*lat < -270)
        {
                *lat += 360;
        }

        /* Now see if latitude is past the top or bottom of the world.
         * Past 90  or -90 puts us on the other side of the earth,
             * so wrap latitude and add 180 to longitude to reflect that. */
        if (*lat > 90)
        {
                *lat = 180 - *lat;
                *lon += 180;
        }
        if (*lat < -90)
        {
                *lat = -180 - *lat;
                *lon += 180;
        }
        /* Now make sure lon is in the normal range.  Wrapping longitude
         * has no effect on latitude. */
        while (*lon > 180)
        {
                *lon -= 360;
        }
        while (*lon < -180)
        {
                *lon += 360;
        }
}

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