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/*
* libslp-location
*
* Copyright (c) 2010-2013 Samsung Electronics Co., Ltd. All rights reserved.
*
* Contact: Youngae Kang <youngae.kang@samsung.com>, Minjune Kim <sena06.kim@samsung.com>
* Genie Kim <daejins.kim@samsung.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "location-position.h"
#include "location-setting.h"
#include "location-log.h"
#define DEG2RAD(x) ((x) * M_PI / 180)
GType
location_position_get_type (void)
{
static volatile gsize type_volatile = 0;
if(g_once_init_enter(&type_volatile)) {
GType type = g_boxed_type_register_static (
g_intern_static_string ("LocationPosition"),
(GBoxedCopyFunc) location_position_copy,
(GBoxedFreeFunc) location_position_free);
g_once_init_leave(&type_volatile, type);
}
return type_volatile;
}
EXPORT_API LocationPosition *
location_position_new (guint timestamp,
gdouble latitude,
gdouble longitude,
gdouble altitude,
LocationStatus status)
{
if (latitude < -90 || latitude > 90) return NULL;
if (longitude < -180 || longitude > 180) return NULL;
LocationPosition* position = g_slice_new0(LocationPosition);
position->timestamp = timestamp;
position->latitude = latitude;
position->longitude = longitude;
position->altitude = altitude;
position->status = status;
return position;
}
EXPORT_API void
location_position_free (LocationPosition* position)
{
g_return_if_fail(position);
g_slice_free(LocationPosition, position);
}
EXPORT_API gboolean
location_position_equal (const LocationPosition *position1, const LocationPosition *position2)
{
g_return_val_if_fail(position1, FALSE);
g_return_val_if_fail(position2, FALSE);
if (position1->latitude == position2->latitude &&
position1->longitude == position2->longitude &&
position1->altitude == position2->altitude)
return TRUE;
return FALSE;
}
EXPORT_API LocationPosition*
location_position_copy (const LocationPosition *position)
{
g_return_val_if_fail(position, NULL);
LocationPosition *new_position = NULL;
new_position = location_position_new (position->timestamp,
position->latitude,
position->longitude,
position->altitude,
position->status);
return new_position;
}
/* Vincenty formula. WGS-84 */
EXPORT_API int
location_get_distance(const LocationPosition *pos1, const LocationPosition *pos2, gulong *distance)
{
g_return_val_if_fail(pos1, LOCATION_ERROR_PARAMETER);
g_return_val_if_fail(pos2, LOCATION_ERROR_PARAMETER);
g_return_val_if_fail(distance, LOCATION_ERROR_PARAMETER);
*distance = 0;
const double a = 6378137.0, b = 6356752.314245, f = 1/298.257223563;
double delta_lon = DEG2RAD(pos2->longitude-pos1->longitude);
double u_1 = atan((1-f) * tan(DEG2RAD(pos1->latitude)));
double u_2 = atan((1-f) * tan(DEG2RAD(pos2->latitude)));
double lambdaP, iter_limit = 100.0;
double lambda = delta_lon;
double sin_sigma, sin_alpha, cos_sigma, sigma, sq_cos_alpha, cos_2sigma, C;
double sq_u, cal1, cal2, delta_sigma, cal_dist;
double sin_lambda, cos_lambda;
double sin_u1 = sin(u_1);
double cos_u1 = cos(u_1);
double sin_u2 = sin(u_2);
double cos_u2 = cos(u_2);
do {
sin_lambda = sin(lambda);
cos_lambda = cos(lambda);
sin_sigma = sqrt((cos_u2*sin_lambda)*(cos_u2*sin_lambda) + \
(cos_u1*sin_u2-sin_u1*cos_u2*cos_lambda) * \
(cos_u1*sin_u2-sin_u1*cos_u2*cos_lambda));
if (sin_sigma ==0)
return LOCATION_ERROR_NONE; // co-incident points
cos_sigma = sin_u1*sin_u2 + cos_u1*cos_u2*cos_lambda;
sigma = atan2(sin_sigma, cos_sigma);
sin_alpha = cos_u1 * cos_u2 * sin_lambda / sin_sigma;
sq_cos_alpha = 1.0 - sin_alpha*sin_alpha;
cos_2sigma = cos_sigma - 2.0*sin_u1*sin_u2/sq_cos_alpha;
if (isnan(cos_2sigma))
cos_2sigma = 0;
C = f/16.0*sq_cos_alpha*(4.0+f*(4.0-3.0*sq_cos_alpha));
lambdaP = lambda;
lambda = delta_lon + (1.0-C) * f * sin_alpha * \
(sigma + C*sin_sigma*(cos_2sigma+C*cos_sigma*(-1.0+2.0*cos_2sigma*cos_2sigma)));
} while (abs(lambda-lambdaP) > 1e-12 && --iter_limit>0);
if (iter_limit==0) return LOCATION_ERROR_UNKNOWN;
sq_u = sq_cos_alpha * (a*a - b*b) / (b*b);
cal1 = 1.0 + sq_u/16384.0*(4096.0+sq_u*(-768.0+sq_u*(320.0-175.0*sq_u)));
cal2 = sq_u/1024.0 * (256.0+sq_u*(-128.0+sq_u*(74.0-47.0*sq_u)));
delta_sigma = cal2*sin_sigma*(cos_2sigma+cal2/4.0*(cos_sigma*(-1.0+2.0*cos_2sigma*cos_2sigma)- \
cal2/6.0*cos_2sigma*(-3.0+4.0*sin_sigma*sin_sigma)*(-3.0+4.0*cos_2sigma*cos_2sigma)));
cal_dist = b*cal1*(sigma-delta_sigma);
*distance = (gulong) cal_dist;
return LOCATION_ERROR_NONE;
}
EXPORT_API void
location_last_position_a2i(char *position, int *lat, int *lon)
{
char *d_lat, *d_lon;
char latitude[HALF_KEY_LENGTH];
char longitude[HALF_KEY_LENGTH];
memcpy(latitude, position + 1, HALF_KEY_LENGTH - 1);
memcpy(longitude, position + HALF_KEY_LENGTH + 1, HALF_KEY_LENGTH - 1);
latitude[HALF_KEY_LENGTH - 1] = '\0';
longitude[HALF_KEY_LENGTH - 1] = '\0';
d_lat = position;
d_lon = position + HALF_KEY_LENGTH;
*lat = atoi(latitude);
*lon = atoi(longitude);
if (*d_lat == 'S') {
*lat = *lat * -1;
}
if (*d_lon == 'W') {
*lon = *lon * -1;
}
}
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