/**
*
* @param GuifiAPI $gapi GuifiAPI object
*
* @param mixed[] $parameters
*
* @return
*/
function guifi_api_zone_nearest($gapi, $parameters)
{
if (!guifi_api_check_fields($gapi, array('lat', 'lon'), $parameters)) {
return FALSE;
}
$candidates = guifi_zone_get_nearest_candidates($parameters['lat'], $parameters['lon']);
foreach ($candidates as &$candidate) {
$candidate['zone_id'] = $candidate['id'];
unset($candidate['min_lon'], $candidate['max_lon'], $candidate['min_lat'], $candidate['max_lat'], $candidate['d'], $candidate['id']);
}
$nearest = guifi_zone_get_nearest($parameters['lat'], $parameters['lon'], $candidates);
unset($nearest['d']);
$gapi->addResponseField('candidates', $candidates);
$gapi->addResponseField('nearest', $nearest);
return TRUE;
}
/**
* Gets nearest zone of a selected point
* @param $lat Latitude of the point
* @param $lon Longitude of the point
* @return mixed[] The best selected zone which can contain a point
*/
function guifi_zone_get_nearest($lat, $lon, $zones = NULL)
{
if ($zones == NULL) {
$zones = guifi_zone_get_nearest_candidates($lat, $lon);
}
if ($zones) {
$maxd = 0;
$oGC = new GeoCalc();
foreach ($zones as $zone) {
if (empty($zone['d'])) {
$d1 = $oGC->EllipsoidDistance($lat, $lon, $zone['max_lat'], $zone['max_lon']);
$d2 = $oGC->EllipsoidDistance($lat, $lon, $zone['min_lat'], $zone['min_lon']);
$zone['d'] = sqrt($d1 * $d1 + $d2 * $d2);
}
if (empty($maxd) || $zone['d'] < $maxd) {
$maxd = $zone['d'];
$candidate_zone = $zone;
}
}
return $candidate_zone;
} else {
return FALSE;
}
}