kopia lustrzana https://github.com/Hamlib/Hamlib
724 wiersze
19 KiB
C
724 wiersze
19 KiB
C
/**
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||
* \addtogroup utilities
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* @{
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*/
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||
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/**
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* \file src/locator.c
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* \brief locator and bearing conversion interface
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* \author Stephane Fillod and the Hamlib Group
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* \date 2000-2010
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*
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||
* Hamlib Interface - locator, bearing, and conversion calls
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*/
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/*
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||
* Hamlib Interface - locator and bearing conversion calls
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||
* Copyright (c) 2001-2010 by Stephane Fillod
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* Copyright (c) 2003 by Nate Bargmann
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* Copyright (c) 2003 by Dave Hines
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*
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*
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||
* Code to determine bearing and range was taken from the Great Circle,
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* by S. R. Sampson, N5OWK.
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* Ref: "Air Navigation", Air Force Manual 51-40, 1 February 1987
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* Ref: "ARRL Satellite Experimenters Handbook", August 1990
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*
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* Code to calculate distance and azimuth between two Maidenhead locators,
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* taken from wwl, by IK0ZSN Mirko Caserta.
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*
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* New bearing code added by N0NB was found at:
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* http://williams.best.vwh.net/avform.htm#Crs
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*
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/*! \page hamlib Hamlib general purpose API
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*
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* Here are grouped some often used functions, like locator conversion
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* routines.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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#include <hamlib/rotator.h>
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#ifndef DOC_HIDDEN
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#define RADIAN (180.0 / M_PI)
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/* arc length for 1 degree, 60 Nautical Miles */
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#define ARC_IN_KM 111.2
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/* The following is contributed by Dave Hines M1CXW
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*
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* begin dph
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*/
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/*
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* These are the constants used when converting between Maidenhead grid
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* locators and longitude/latitude values. MAX_LOCATOR_PAIRS is the maximum
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* number of locator character pairs to convert. This number MUST NOT exceed
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* the number of pairs of values in loc_char_range[].
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* Setting MAX_LOCATOR_PAIRS to 3 will convert the currently defined 6
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* character locators. A value of 4 will convert the extended 8 character
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* locators described in section 3L of "The IARU region 1 VHF managers
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* handbook". Values of 5 and 6 will extent the format even more, to the
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* longest definition I have seen for locators, see
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* http://www.btinternet.com/~g8yoa/geog/non-ra.html
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* Beware that there seems to be no universally accepted standard for 10 & 12
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* character locators.
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*
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* The ranges of characters which will be accepted by locator2longlat, and
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* generated by longlat2locator, are specified by the loc_char_range[] array.
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* This array may be changed without requiring any other code changes.
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*
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* For the fifth pair to range from aa to xx use:
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* const static int loc_char_range[] = { 18, 10, 24, 10, 24, 10 };
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*
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* For the fifth pair to range from aa to yy use:
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* const static int loc_char_range[] = { 18, 10, 24, 10, 25, 10 };
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*
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* MAX_LOCATOR_PAIRS now sets the limit locator2longlat() will convert and
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* sets the maximum length longlat2locator() will generate. Each function
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* properly handles any value from 1 to 6 so MAX_LOCATOR_PAIRS should be
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* left at 6. MIN_LOCATOR_PAIRS sets a floor on the shortest locator that
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* should be handled. -N0NB
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*/
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const static int loc_char_range[] = { 18, 10, 24, 10, 24, 10 };
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#define MAX_LOCATOR_PAIRS 6
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#define MIN_LOCATOR_PAIRS 1
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/* end dph */
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#endif /* !DOC_HIDDEN */
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/**
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* \brief Convert DMS to decimal degrees
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* \param degrees Degrees, whole degrees
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* \param minutes Minutes, whole minutes
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* \param seconds Seconds, decimal seconds
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* \param sw South or West
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*
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* Convert degree/minute/second angle to decimal degrees angle.
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* \a degrees >360, \a minutes > 60, and \a seconds > 60.0 are allowed,
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* but resulting angle won't be normalized.
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*
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* When the variable sw is passed a value of 1, the returned decimal
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* degrees value will be negative (south or west). When passed a
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* value of 0 the returned decimal degrees value will be positive
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* (north or east).
|
||
*
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||
* \return The angle in decimal degrees.
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*
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* \sa dec2dms()
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||
*/
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double HAMLIB_API dms2dec(int degrees, int minutes, double seconds, int sw)
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{
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double st;
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||
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rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
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||
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||
if (degrees < 0)
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{
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||
degrees = abs(degrees);
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}
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||
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if (minutes < 0)
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||
{
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||
minutes = abs(minutes);
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}
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if (seconds < 0)
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{
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seconds = fabs(seconds);
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}
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st = (double)degrees + (double)minutes / 60. + seconds / 3600.;
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if (sw == 1)
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{
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return -st;
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}
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else
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{
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return st;
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}
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}
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/**
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* \brief Convert D M.MMM notation to decimal degrees
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* \param degrees Degrees, whole degrees
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* \param minutes Minutes, decimal minutes
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* \param sw South or West
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*
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* Convert a degrees, decimal minutes notation common on
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* many GPS units to its decimal degrees value.
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*
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* \a degrees > 360, \a minutes > 60.0 are allowed, but
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* resulting angle won't be normalized.
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*
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* When the variable sw is passed a value of 1, the returned decimal
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* degrees value will be negative (south or west). When passed a
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* value of 0 the returned decimal degrees value will be positive
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* (north or east).
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*
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* \return The angle in decimal degrees.
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*
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* \sa dec2dmmm()
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||
*/
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double HAMLIB_API dmmm2dec(int degrees, double minutes, int sw)
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{
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double st;
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rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
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if (degrees < 0)
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{
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degrees = abs(degrees);
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}
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if (minutes < 0)
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{
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minutes = fabs(minutes);
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}
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st = (double)degrees + minutes / 60.;
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if (sw == 1)
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{
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return -st;
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}
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else
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{
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return st;
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}
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||
}
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||
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/**
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* \brief Convert decimal degrees angle into DMS notation
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* \param dec Decimal degrees
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* \param degrees Pointer for the calculated whole Degrees
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* \param minutes Pointer for the calculated whole Minutes
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* \param seconds Pointer for the calculated decimal Seconds
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* \param sw Pointer for the calculated SW flag
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*
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* Convert decimal degrees angle into its degree/minute/second
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* notation.
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*
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* When \a dec < -180 or \a dec > 180, the angle will be normalized
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* within these limits and the sign set appropriately.
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*
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* Upon return dec2dms guarantees 0 >= \a degrees <= 180,
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* 0 >= \a minutes < 60, and 0.0 >= \a seconds < 60.0.
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*
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* When \a dec is < 0.0 \a sw will be set to 1. When \a dec is
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* >= 0.0 \a sw will be set to 0. This flag allows the application
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* to determine whether the DMS angle should be treated as negative
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* (south or west).
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*
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* \retval -RIG_EINVAL if any of the pointers are NULL.
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* \retval RIG_OK if conversion went OK.
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*
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* \sa dms2dec()
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*/
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int HAMLIB_API dec2dms(double dec,
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int *degrees,
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int *minutes,
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double *seconds,
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int *sw)
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{
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int deg, min;
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double st;
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rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
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/* bail if NULL pointers passed */
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if (!degrees || !minutes || !seconds || !sw)
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{
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return -RIG_EINVAL;
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||
}
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||
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||
/* reverse the sign if dec has a magnitude greater
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* than 180 and factor out multiples of 360.
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* e.g. when passed 270 st will be set to -90
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* and when passed -270 st will be set to 90. If
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* passed 361 st will be set to 1, etc. If passed
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* a value > -180 || < 180, value will be unchanged.
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*/
|
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if (dec >= 0.0)
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{
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st = fmod(dec + 180, 360) - 180;
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}
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else
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{
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st = fmod(dec - 180, 360) + 180;
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}
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/* if after all of that st is negative, we want deg
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* to be negative as well except for 180 which we want
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* to be positive.
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*/
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if (st < 0.0 && st != -180)
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{
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*sw = 1;
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}
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else
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{
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*sw = 0;
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}
|
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|
||
/* work on st as a positive value to remove a
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* bug introduced by the effect of floor() when
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* passed a negative value. e.g. when passed
|
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* -96.8333 floor() returns -95! Also avoids
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* a rounding error introduced on negative values.
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*/
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st = fabs(st);
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deg = (int)floor(st);
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st = 60. * (st - (double)deg);
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min = (int)floor(st);
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st = 60. * (st - (double)min);
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*degrees = deg;
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*minutes = min;
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*seconds = st;
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return RIG_OK;
|
||
}
|
||
|
||
|
||
/**
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* \brief Convert a decimal angle into D M.MMM notation
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||
* \param dec Decimal degrees
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||
* \param degrees Pointer for the calculated whole Degrees
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||
* \param minutes Pointer for the calculated decimal Minutes
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||
* \param sw Pointer for the calculated SW flag
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||
*
|
||
* Convert a decimal angle into its degree, decimal minute
|
||
* notation common on many GPS units.
|
||
*
|
||
* When passed a value < -180 or > 180, the value will be normalized
|
||
* within these limits and the sign set apropriately.
|
||
*
|
||
* Upon return dec2dmmm guarantees 0 >= \a degrees <= 180,
|
||
* 0.0 >= \a minutes < 60.0.
|
||
*
|
||
* When \a dec is < 0.0 \a sw will be set to 1. When \a dec is
|
||
* >= 0.0 \a sw will be set to 0. This flag allows the application
|
||
* to determine whether the D M.MMM angle should be treated as negative
|
||
* (south or west).
|
||
*
|
||
* \retval -RIG_EINVAL if any of the pointers are NULL.
|
||
* \retval RIG_OK if conversion went OK.
|
||
*
|
||
* \sa dmmm2dec()
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||
*/
|
||
int HAMLIB_API dec2dmmm(double dec, int *degrees, double *minutes, int *sw)
|
||
{
|
||
int r, min;
|
||
double sec;
|
||
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
/* bail if NULL pointers passed */
|
||
if (!degrees || !minutes || !sw)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
r = dec2dms(dec, degrees, &min, &sec, sw);
|
||
|
||
if (r != RIG_OK)
|
||
{
|
||
return r;
|
||
}
|
||
|
||
*minutes = (double)min + sec / 60;
|
||
|
||
return RIG_OK;
|
||
}
|
||
|
||
|
||
/**
|
||
* \brief Convert Maidenhead grid locator to Longitude/Latitude
|
||
* \param longitude Pointer for the calculated Longitude
|
||
* \param latitude Pointer for the calculated Latitude
|
||
* \param locator The Maidenhead grid locator--2 through 12 char + nul string
|
||
*
|
||
* Convert Maidenhead grid locator to Longitude/Latitude (decimal degrees).
|
||
* The locator should be in 2 through 12 chars long format.
|
||
* \a locator2longlat is case insensitive, however it checks for
|
||
* locator validity.
|
||
*
|
||
* Decimal long/lat is computed to center of grid square, i.e. given
|
||
* EM19 will return coordinates equivalent to the southwest corner
|
||
* of EM19mm.
|
||
*
|
||
* \retval -RIG_EINVAL if locator exceeds RR99xx99xx99 or exceeds length
|
||
* limit--currently 1 to 6 lon/lat pairs.
|
||
* \retval RIG_OK if conversion went OK.
|
||
*
|
||
* \bug The fifth pair ranges from aa to xx, there is another convention
|
||
* that ranges from aa to yy. At some point both conventions should be
|
||
* supported.
|
||
*
|
||
* \sa longlat2locator()
|
||
*/
|
||
/* begin dph */
|
||
int HAMLIB_API locator2longlat(double *longitude,
|
||
double *latitude,
|
||
const char *locator)
|
||
{
|
||
int x_or_y, paircount;
|
||
int locvalue, pair;
|
||
int divisions;
|
||
double xy[2], ordinate;
|
||
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
/* bail if NULL pointers passed */
|
||
if (!longitude || !latitude)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
paircount = strlen(locator) / 2;
|
||
|
||
/* verify paircount is within limits */
|
||
if (paircount > MAX_LOCATOR_PAIRS)
|
||
{
|
||
paircount = MAX_LOCATOR_PAIRS;
|
||
}
|
||
else if (paircount < MIN_LOCATOR_PAIRS)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
/* For x(=longitude) and y(=latitude) */
|
||
for (x_or_y = 0; x_or_y < 2; ++x_or_y)
|
||
{
|
||
ordinate = -90.0;
|
||
divisions = 1;
|
||
|
||
for (pair = 0; pair < paircount; ++pair)
|
||
{
|
||
locvalue = locator[pair * 2 + x_or_y];
|
||
|
||
/* Value of digit or letter */
|
||
locvalue -= (loc_char_range[pair] == 10) ? '0' :
|
||
(isupper(locvalue)) ? 'A' : 'a';
|
||
|
||
/* Check range for non-letter/digit or out of range */
|
||
if ((locvalue < 0) || (locvalue >= loc_char_range[pair]))
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
divisions *= loc_char_range[pair];
|
||
ordinate += locvalue * 180.0 / divisions;
|
||
}
|
||
|
||
/* Center ordinate in the Maidenhead "square" or "subsquare" */
|
||
ordinate += 90.0 / divisions;
|
||
|
||
xy[x_or_y] = ordinate;
|
||
}
|
||
|
||
*longitude = xy[0] * 2.0;
|
||
*latitude = xy[1];
|
||
|
||
return RIG_OK;
|
||
}
|
||
/* end dph */
|
||
|
||
|
||
/**
|
||
* \brief Convert longitude/latitude to Maidenhead grid locator
|
||
* \param longitude Longitude, decimal degrees
|
||
* \param latitude Latitude, decimal degrees
|
||
* \param locator Pointer for the Maidenhead Locator
|
||
* \param pair_count Precision expressed as lon/lat pairs in the locator
|
||
*
|
||
* Convert longitude/latitude (decimal degrees) to Maidenhead grid locator.
|
||
* \a locator must point to an array at least \a pair_count * 2 char + '\\0'.
|
||
*
|
||
* \retval -RIG_EINVAL if \a locator is NULL or \a pair_count exceeds
|
||
* length limit. Currently 1 to 6 lon/lat pairs.
|
||
* \retval RIG_OK if conversion went OK.
|
||
*
|
||
* \bug \a locator is not tested for overflow.
|
||
* \bug The fifth pair ranges from aa to yy, there is another convention
|
||
* that ranges from aa to xx. At some point both conventions should be
|
||
* supported.
|
||
*
|
||
* \sa locator2longlat()
|
||
*/
|
||
/* begin dph */
|
||
int HAMLIB_API longlat2locator(double longitude,
|
||
double latitude,
|
||
char *locator,
|
||
int pair_count)
|
||
{
|
||
int x_or_y, pair, locvalue, divisions;
|
||
double square_size, ordinate;
|
||
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
if (!locator)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
if (pair_count < MIN_LOCATOR_PAIRS || pair_count > MAX_LOCATOR_PAIRS)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
for (x_or_y = 0; x_or_y < 2; ++x_or_y)
|
||
{
|
||
ordinate = (x_or_y == 0) ? longitude / 2.0 : latitude;
|
||
divisions = 1;
|
||
|
||
/* The 1e-6 here guards against floating point rounding errors */
|
||
ordinate = fmod(ordinate + 270.000001, 180.0);
|
||
|
||
for (pair = 0; pair < pair_count; ++pair)
|
||
{
|
||
divisions *= loc_char_range[pair];
|
||
square_size = 180.0 / divisions;
|
||
|
||
locvalue = (int)(ordinate / square_size);
|
||
ordinate -= square_size * locvalue;
|
||
locvalue += (loc_char_range[pair] == 10) ? '0' : 'A';
|
||
locator[pair * 2 + x_or_y] = locvalue;
|
||
}
|
||
}
|
||
|
||
locator[pair_count * 2] = '\0';
|
||
|
||
return RIG_OK;
|
||
}
|
||
/* end dph */
|
||
|
||
|
||
/**
|
||
* \brief Calculate the distance and bearing between two points.
|
||
* \param lon1 The local Longitude, decimal degrees
|
||
* \param lat1 The local Latitude, decimal degrees
|
||
* \param lon2 The remote Longitude, decimal degrees
|
||
* \param lat2 The remote Latitude, decimal degrees
|
||
* \param distance Pointer for the distance, km
|
||
* \param azimuth Pointer for the bearing, decimal degrees
|
||
*
|
||
* Calculate the QRB between \a lon1, \a lat1 and \a lon2, \a lat2.
|
||
*
|
||
* This version will calculate the QRB to a precision sufficient
|
||
* for 12 character locators. Antipodal points, which are easily
|
||
* calculated, are considered equidistant and the bearing is
|
||
* simply resolved to be true north (0.0<EFBFBD>).
|
||
*
|
||
* \retval -RIG_EINVAL if NULL pointer passed or lat and lon values
|
||
* exceed -90 to 90 or -180 to 180.
|
||
* \retval RIG_OK if calculations are successful.
|
||
*
|
||
* \return The distance in kilometers and azimuth in decimal degrees
|
||
* for the short path are stored in \a distance and \a azimuth.
|
||
*
|
||
* \sa distance_long_path(), azimuth_long_path()
|
||
*/
|
||
int HAMLIB_API qrb(double lon1,
|
||
double lat1,
|
||
double lon2,
|
||
double lat2,
|
||
double *distance,
|
||
double *azimuth)
|
||
{
|
||
double delta_long, tmp, arc, az;
|
||
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
/* bail if NULL pointers passed */
|
||
if (!distance || !azimuth)
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
if ((lat1 > 90.0 || lat1 < -90.0) || (lat2 > 90.0 || lat2 < -90.0))
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
if ((lon1 > 180.0 || lon1 < -180.0) || (lon2 > 180.0 || lon2 < -180.0))
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
|
||
/* Prevent ACOS() Domain Error */
|
||
if (lat1 == 90.0)
|
||
{
|
||
lat1 = 89.999999999;
|
||
}
|
||
else if (lat1 == -90.0)
|
||
{
|
||
lat1 = -89.999999999;
|
||
}
|
||
|
||
if (lat2 == 90.0)
|
||
{
|
||
lat2 = 89.999999999;
|
||
}
|
||
else if (lat2 == -90.0)
|
||
{
|
||
lat2 = -89.999999999;
|
||
}
|
||
|
||
/* Convert variables to Radians */
|
||
lat1 /= RADIAN;
|
||
lon1 /= RADIAN;
|
||
lat2 /= RADIAN;
|
||
lon2 /= RADIAN;
|
||
|
||
delta_long = lon2 - lon1;
|
||
|
||
tmp = sin(lat1) * sin(lat2) + cos(lat1) * cos(lat2) * cos(delta_long);
|
||
|
||
if (tmp > .999999999999999)
|
||
{
|
||
/* Station points coincide, use an Omni! */
|
||
*distance = 0.0;
|
||
*azimuth = 0.0;
|
||
return RIG_OK;
|
||
}
|
||
|
||
if (tmp < -.999999)
|
||
{
|
||
/*
|
||
* points are antipodal, it's straight down.
|
||
* Station is equal distance in all Azimuths.
|
||
* So take 180 Degrees of arc times 60 nm,
|
||
* and you get 10800 nm, or whatever units...
|
||
*/
|
||
*distance = 180.0 * ARC_IN_KM;
|
||
*azimuth = 0.0;
|
||
return RIG_OK;
|
||
}
|
||
|
||
arc = acos(tmp);
|
||
|
||
/*
|
||
* One degree of arc is 60 Nautical miles
|
||
* at the surface of the earth, 111.2 km, or 69.1 sm
|
||
* This method is easier than the one in the handbook
|
||
*/
|
||
*distance = ARC_IN_KM * RADIAN * arc;
|
||
|
||
/* Short Path */
|
||
/* Change to azimuth computation by Dave Freese, W1HKJ */
|
||
az = RADIAN * atan2(sin(lon2 - lon1) * cos(lat2),
|
||
(cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(lon2 - lon1)));
|
||
|
||
az = fmod(360.0 + az, 360.0);
|
||
|
||
if (az < 0.0)
|
||
{
|
||
az += 360.0;
|
||
}
|
||
else if (az >= 360.0)
|
||
{
|
||
az -= 360.0;
|
||
}
|
||
|
||
*azimuth = floor(az + 0.5);
|
||
|
||
return RIG_OK;
|
||
}
|
||
|
||
|
||
/**
|
||
* \brief Calculate the long path distance between two points.
|
||
* \param distance The shortpath distance
|
||
*
|
||
* Calculate the long path (respective of the short path)
|
||
* of a given distance.
|
||
*
|
||
* \return the distance in kilometers for the opposite path.
|
||
*
|
||
* \sa qrb()
|
||
*/
|
||
double HAMLIB_API distance_long_path(double distance)
|
||
{
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
return (ARC_IN_KM * 360.0) - distance;
|
||
}
|
||
|
||
|
||
/**
|
||
* \brief Calculate the long path bearing between two points.
|
||
* \param azimuth The shortpath bearing--0.0 to 360.0 degrees
|
||
*
|
||
* Calculate the long path (respective of the short path)
|
||
* of a given bearing.
|
||
*
|
||
* \return the azimuth in decimal degrees for the opposite path or
|
||
* -RIG_EINVAL upon input error (outside the range of 0.0 to 360.0).
|
||
*
|
||
* \sa qrb()
|
||
*/
|
||
double HAMLIB_API azimuth_long_path(double azimuth)
|
||
{
|
||
rot_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
|
||
|
||
if (azimuth == 0.0 || azimuth == 360.0)
|
||
{
|
||
return 180.0;
|
||
}
|
||
else if (azimuth > 0.0 && azimuth < 180.0)
|
||
{
|
||
return 180.0 + azimuth;
|
||
}
|
||
else if (azimuth == 180.0)
|
||
{
|
||
return 0.0;
|
||
}
|
||
else if (azimuth > 180.0 && azimuth < 360.0)
|
||
{
|
||
return (180.0 - azimuth) * -1.0;
|
||
}
|
||
else
|
||
{
|
||
return -RIG_EINVAL;
|
||
}
|
||
}
|
||
|
||
/*! @} */
|