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/*
Copyright 2008 Edouard Griffiths, F4EXB.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
See gpl.txt for the details of the licensing terms.
*/
#include <cctype> // for toupper
#include <algorithm>
#define _USE_MATH_DEFINES
#include <math.h>
#include "locator.h"
namespace DSDcc
{
// LocatorInvalidException class
std::string LocatorInvalidException::getString()
{ return _locator_str; }
// Locator class
std::string const Locator::m_lon_array1 = "ABCDEFGHIJKLMNOPQR";
std::string const Locator::m_lat_array1 = "ABCDEFGHIJKLMNOPQR";
std::string const Locator::m_lon_array2 = "0123456789";
std::string const Locator::m_lat_array2 = "0123456789";
std::string const Locator::m_lon_array3 = "ABCDEFGHIJKLMNOPQRSTUVWX";
std::string const Locator::m_lat_array3 = "ABCDEFGHIJKLMNOPQRSTUVWX";
Locator::Locator() : m_lat(0.0), m_lon(0.0)
{
setIndexes();
}
Locator::Locator(std::string loc_string)
{
// locator must be exactly 6 characters
if (loc_string.length() != 6)
throw LocatorInvalidException(loc_string);
// convert to upper case
std::transform(loc_string.begin(), loc_string.end(), loc_string.begin(), toupper);
// retrieve latitude and longitude indexes
std::string::size_type sz = m_lon_array1.find(loc_string[0]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lon_index1 = sz;
}
sz = m_lat_array1.find(loc_string[1]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lat_index1 = sz;
}
sz = m_lon_array2.find(loc_string[2]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lon_index2 = sz;
}
sz = m_lat_array2.find(loc_string[3]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lat_index2 = sz;
}
sz = m_lon_array3.find(loc_string[4]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lon_index3 = sz;
}
sz = m_lat_array3.find(loc_string[5]);
if (sz == std::string::npos) {
throw LocatorInvalidException(loc_string);
} else {
m_lat_index3 = sz;
}
// convert to decimal degrees for lower corner of locator square
m_lat = (m_lat_index1 * 10.0) - 90.0;
m_lon = (m_lon_index1 * 20.0) - 180.0;
m_lat += m_lat_index2;
m_lon += m_lon_index2 * 2.0;
m_lat += m_lat_index3 / 24.0;
m_lon += m_lon_index3 / 12.0;
// adjust to center of locator square
m_lat += 1.25 / 60.0;
m_lon += 2.5 / 60.0;
}
Locator::Locator(float lat, float lon) : m_lat(lat), m_lon(lon)
{
setIndexes();
}
void Locator::setLatLon(float lat, float lon)
{
m_lat = lat;
m_lon = lon;
setIndexes();
}
void Locator::setIndexes()
{
float lat_rem, lon_rem;
m_lat_index1 = int((m_lat + 90.0) / 10.0);
m_lon_index1 = int((m_lon + 180.0) / 20.0);
lat_rem = m_lat + 90.0 - (m_lat_index1 * 10.0);
lon_rem = m_lon + 180.0 - (m_lon_index1 * 20.0);
m_lat_index2 = int(lat_rem);
m_lon_index2 = int(lon_rem / 2.0);
lat_rem = lat_rem - m_lat_index2;
lon_rem = lon_rem - (m_lon_index2 * 2);
m_lat_index3 = int(lat_rem * 24.0);
m_lon_index3 = int(lon_rem * 12.0);
}
std::string Locator::toString() const
{
std::string returned = "";
returned.append(1,m_lon_array1[m_lon_index1]);
returned.append(1,m_lat_array1[m_lat_index1]);
returned.append(1,m_lon_array2[m_lon_index2]);
returned.append(1,m_lat_array2[m_lat_index2]);
returned.append(1,m_lon_array3[m_lon_index3]);
returned.append(1,m_lat_array3[m_lat_index3]);
return returned;
}
void Locator::toCSting(char *locator) const
{
locator[0] = m_lon_array1[m_lon_index1];
locator[1] = m_lat_array1[m_lat_index1];
locator[2] = m_lon_array2[m_lon_index2];
locator[3] = m_lat_array2[m_lat_index2];
locator[4] = m_lon_array3[m_lon_index3];
locator[5] = m_lat_array3[m_lat_index3];
}
// LocPoint class
float LocPoint::bearingTo(const LocPoint& distant_point)
{
double lat1 = m_locator.latitude() * (M_PI / 180.0);
double lon1 = m_locator.longitude() * (M_PI / 180.0);
double lat2 = distant_point.latitude() * (M_PI / 180.0);
double lon2 = distant_point.longitude() * (M_PI / 180.0);
double dLon = lon2 - lon1;
double y = sin(dLon) * cos(lat2);
double x = (cos(lat1)*sin(lat2)) -
(sin(lat1)*cos(lat2)*cos(dLon));
double bear_rad = atan2(y,x);
if (bear_rad > 0)
return bear_rad * (180.0 / M_PI);
else
return 360.0 + (bear_rad * (180.0 / M_PI));
}
float LocPoint::distanceTo(const LocPoint& distant_point)
{
double lat1 = m_locator.latitude() * (M_PI / 180.0);
double lon1 = m_locator.longitude() * (M_PI / 180.0);
double lat2 = distant_point.latitude() * (M_PI / 180.0);
double lon2 = distant_point.longitude() * (M_PI / 180.0);
return acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon2-lon1))*6371.0;
}
} // namespace DSDcc
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