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	  Quatres cadrans sont considérés par le quad tree
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	  Quatres cadrans sont considérés par le quad tree
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	  * = centre de la fenetre
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	  * = centre de la fenetre
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	 */
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	 */
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	public static function creerGroupesQuadtree(&$markers, $neLat, $neLng, $swLat, $swLng, $zoom = 3) {
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	public static function creerGroupesQuadtree(&$markers, $neLat, $neLng, $swLat, $swLng, $zoom = 3) {
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		if(count($markers) > self::$seuilClusterisation) {
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		if (count($markers) > self::$seuilClusterisation) {
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			self::calculerProfondeurMax($zoom);
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			self::calculerProfondeurMax($zoom);
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			self::calculerPasCorrectionCentre($zoom);
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			self::calculerPasCorrectionCentre($zoom);
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			$noeudRacine = array('nbrePoints' => count($markers), 'points' => $markers);
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			self::attribuerAuCadran($noeudRacine, $neLat, $neLng, $swLat, $swLng);
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			$noeudRacine = array('nbrePoints' => count($markers), 'points' => $markers);
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			self::attribuerAuCadran($noeudRacine, $neLat, $neLng, $swLat, $swLng);
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		} else {
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		} else {
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			foreach($markers as $marker) {
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			foreach($markers as $marker) {
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				$points = array($marker);
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				$points = array($marker);
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				$noeudSimple = array('points' => $points, 'nbrePoints' => 1);
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				$noeudSimple = array('points' => $points, 'nbrePoints' => 1);
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		}
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		}
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		return $cadran;
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		return $cadran;
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	}
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	}
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	private static function ajouterFils(&$noeud, $cadran, &$point) {
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	private static function ajouterFils(&$noeud, $cadran, &$point) {
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		$fils = array('points' => array(), 'nbrePoints' => 0, 'latMoyenne' => 0, 'lngMoyenne' => 0);
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		if (isset($noeud[$cadran])) {
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			$fils = $noeud[$cadran];
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		}
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		$fils = array('points' => array(), 'nbrePoints' => 1, 'latMoyenne' => 0, 'lngMoyenne' => 0);
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		$fils['points'][] = $point;
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		$fils['points'][] = $point;
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		$fils['nbrePoints'] = isset($noeud[$cadran]['nbrePoints']) ? $noeud[$cadran]['nbrePoints']++ : 1;
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		$fils['nbrePoints']++;
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		$fils['latMoyenne'] += $point['lat'];
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		$fils['latMoyenne'] += $point['lat'];
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		$fils['lngMoyenne'] += $point['lng'];
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		$fils['lngMoyenne'] += $point['lng'];
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		$noeud[$cadran] = $fils;
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		$noeud[$cadran] = $fils;