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<?php
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class CelRadiusPoints extends Cel {
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private $champs = array("id_observation", "nom_sel", "latitude", "longitude", "COUNT(id_observation) as nb_obs");
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private $champs_min = array("latitude", "longitude");
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private $champs_mode = null;
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/**
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* Méthode appelée avec une requête de type GET.
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*/
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public function getRessource() {
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$this->champs_mode = $this->champs_min;
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return $this->getElement(array());
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}
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/**
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* Méthode appelée avec une requête de type GET.
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*/
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public function getElement($params) {
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$lat_centre = str_replace(',', '.', round(floatval($_GET['lat']), 3));
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$lon_centre = str_replace(',', '.', round(floatval($_GET['lon']), 3));
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$radius = str_replace(',', '.', floatval($_GET['radius']/1000));
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$retour = array();
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$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 ".
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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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$points = Cel::db()->requeter($requete);
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return $points;
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}
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private function renvoyerDistanceSql($lat_centre, $lon_centre) {
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$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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return $sous_requete;
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}
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public function obtenirPointPlusProche($lat_centre, $lon_centre) {
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// TODO: faire moins moche et plus efficace
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$requete = "SELECT ".
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implode(", ", $this->champs_mode).", ".$this->renvoyerDistanceSql($lat_centre, $lon_centre)." AS distance ".
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"FROM cel_obs ".
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"WHERE latitude != 0 AND longitude != 0 ".
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"GROUP BY latitude, longitude ".
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"ORDER BY distance ".
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"LIMIT 1";
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$point = Cel::db()->requeterLigne($requete);
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return $point;
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}
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}
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