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aurelien |
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<?php
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jpm |
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// declare(encoding='UTF-8');
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/**
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* Service renvoyant les observations présentent au sein d'un cercle de rayon donné.
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*
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* @internal Mininum PHP version : 5.2
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* @category CEL
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* @package Services
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jpm |
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* @subpackage Cartes
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jpm |
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* @version 0.1
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* @author Mathias CHOUET <mathias@tela-botanica.org>
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* @author Jean-Pascal MILCENT <jpm@tela-botanica.org>
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* @author Aurelien PERONNET <aurelien@tela-botanica.org>
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* @license GPL v3 <http://www.gnu.org/licenses/gpl.txt>
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* @license CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>
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* @copyright 1999-2014 Tela Botanica <accueil@tela-botanica.org>
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*/
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aurelien |
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class CelRadiusPoints extends Cel {
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jpm |
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aurelien |
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private $champs_max = array('id_observation', 'nom_sel', 'latitude', 'longitude', 'COUNT(id_observation) AS nb_obs', 'GROUP_CONCAT(id_observation) as ids_obs');
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jpm |
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private $champs_min = array('latitude', 'longitude');
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aurelien |
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private $champs_mode = null;
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jpm |
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/**
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* Méthode appelée avec une requête de type GET.
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*/
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aurelien |
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public function getRessource() {
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$this->champs_mode = $this->champs_min;
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return $this->getElement(array());
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aurelien |
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}
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jpm |
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/**
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* Méthode appelée avec une requête de type GET.
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*/
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public function getElement($params) {
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aurelien |
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$lat_centre = str_replace(',', '.', round(floatval($_GET['lat']), 3));
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$lon_centre = str_replace(',', '.', round(floatval($_GET['lon']), 3));
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aurelien |
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$radius = str_replace(',', '.', floatval($_GET['radius']/1000));
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aurelien |
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if (isset($_GET['format'])) {
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if ($_GET['format'] == 'max') {
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$this->champs_mode = $this->champs_max;
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} else if($_GET['format'] == 'min') {
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$this->champs_mode = $this->champs_min;
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}
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}
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jpm |
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aurelien |
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$retour = array();
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jpm |
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aurelien |
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$retour['points'] = $this->obtenirPointsPourCentreEtRadius($lat_centre, $lon_centre, $radius);
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if (empty($retour['points'])) {
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$retour['plus_proche'] = $this->obtenirPointPlusProche($lat_centre, $lon_centre);
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}
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$this->envoyerJson($retour);
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}
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public function obtenirPointsPourCentreEtRadius($lat_centre, $lon_centre, $radius) {
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$requete = 'SELECT '.implode(', ', $this->champs_mode).' '.
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'FROM cel_obs '.
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'WHERE latitude != 0 AND longitude != 0 '.
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'AND '.$this->renvoyerDistanceSql($lat_centre, $lon_centre)." < $radius ".
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'GROUP BY latitude, longitude '.
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' -- '.__FILE__.':'.__LINE__;
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aurelien |
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$points = Cel::db()->requeter($requete);
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return $points;
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}
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jpm |
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aurelien |
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private function renvoyerDistanceSql($lat_centre, $lon_centre) {
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jpm |
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$sous_requete =
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"( ".
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"6371 * acos ( ".
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"cos ( radians($lat_centre) ) ".
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"* cos( radians( latitude ) ) ".
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"* cos( radians( longitude ) - radians($lon_centre) ) ".
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"+ sin ( radians($lat_centre) ) ".
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"* sin( radians( latitude ) ) ".
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") ".
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") ";
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aurelien |
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return $sous_requete;
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}
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aurelien |
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public function obtenirPointPlusProche($lat_centre, $lon_centre) {
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aurelien |
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// TODO: faire moins moche et plus efficace
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$requete = 'SELECT '.
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implode(", ", $this->champs_mode).", ".$this->renvoyerDistanceSql($lat_centre, $lon_centre)." AS distance ".
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'FROM cel_obs '.
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'WHERE latitude != 0 AND longitude != 0 '.
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'GROUP BY latitude, longitude '.
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'ORDER BY distance '.
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'LIMIT 1 '.
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' -- '.__FILE__.':'.__LINE__;
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$point = Cel::db()->requeterLigne($requete);
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return $point;
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}
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}
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