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<?php
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class CartoGroupage {
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private static $seuilClusterisation = 100;
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private static $zoomDefaut = 3;
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private static $zoomMaxClustering = 12;
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private static $pasZoomDefaut = 1;
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private static $pasZoomMaxClustering = 0.05;
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private static $profondeurMin = 0;
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private static $profondeurMax = 8;
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private static $pasCorrectionCentre = null;
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private static $coefficientReductionPas = null;
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private static $coefficientProfondeurMax = null;
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private static $listeNoeudsSelectionnes = array();
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/*
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+---------+---------+
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| A | B |
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+---------*---------+
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| D | C |
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+---------+---------+
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Quatres cadrans sont considérés par le quad tree
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* = centre de la fenetre
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*/
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public static function creerGroupesQuadtree($markers, $neLat, $neLng, $swLat, $swLng, $zoom = 3) {
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if(count($markers) > self::$seuilClusterisation) {
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self::calculerProfondeurMax($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, $swLng);
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} else {
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foreach($markers as $marker) {
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$points = array($marker);
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$noeudSimple = array('points' => $points, 'nbrePoints' => 1);
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self::$listeNoeudsSelectionnes[] = self::ajouterGroupeOuPoint($noeudSimple);
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}
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}
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return self::$listeNoeudsSelectionnes;
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}
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private function calculerCoefficientReductionPas() {
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if(self::$coefficientReductionPas == null) {
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self::$coefficientReductionPas = (self::$pasZoomMaxClustering - self::$pasZoomDefaut)/(self::$zoomMaxClustering - self::$zoomDefaut);
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}
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return self::$coefficientReductionPas;
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}
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private function calculerPasCorrectionCentre($zoom) {
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self::$pasCorrectionCentre = ($zoom - self::$zoomDefaut) * self::calculerCoefficientReductionPas() + self::$pasZoomDefaut;
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}
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private function calculerCoefficientProfondeurMax() {
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if(self::$coefficientProfondeurMax == null) {
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self::$coefficientProfondeurMax = (self::$profondeurMax - self::$profondeurMin)/(self::$zoomMaxClustering - self::$zoomDefaut);
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}
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return self::$coefficientProfondeurMax;
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}
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private function calculerProfondeurMax($zoom) {
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if($zoom > self::$zoomDefaut) {
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self::$profondeurMax = round(($zoom - self::$zoomDefaut) * self::calculerCoefficientProfondeurMax() + self::$profondeurMin,0);
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} else {
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self::$profondeurMax = 1;
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}
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}
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/**
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*
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* @param mixed $noeud Le noeud à traiter par le quadtree
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* @param float $neLat Latitude du coin nord est de la fenetre
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* @param float $neLng Longitude du coin nord est de la fenetre
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* @param float $swLat Latitude du coin sud ouest de la fenetre
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* @param float $swLng Longitude du coin sud ouest de la fenetre
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* @param int $profondeur profondeur courante de l'arbre
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*/
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private static function attribuerAuCadran(&$noeud, $neLat, $neLng, $swLat, $swLng, $profondeur = 0) {
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$latCentre = round((($neLat+$swLat)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
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$lngCentre = round((($neLng+$swLng)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
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foreach ($noeud['points'] as &$point) {
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$cadran = self::obtenirCadranPourPoint($latCentre, $lngCentre, $point);
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self::ajouterFils($noeud,$cadran,$point);
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}
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$profondeur++;
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if($profondeur <= self::$profondeurMax) {
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($noeud['A'] != null) ? self::attribuerAuCadran($noeud['A'], $neLat, $lngCentre , $latCentre, $lngSw, $profondeur) : '';
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($noeud['B'] != null) ? self::attribuerAuCadran($noeud['B'], $neLat, $neLng, $latCentre, $lngCentre, $profondeur) : '';
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($noeud['C'] != null) ? self::attribuerAuCadran($noeud['C'], $latCentre, $neLng, $swLat, $lngCentre, $profondeur) : '';
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($noeud['D'] != null) ? self::attribuerAuCadran($noeud['D'], $latCentre, $lngCentre, $swLat, $swLng, $profondeur) : '';
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}
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if(self::estUnParentFeuilles($noeud)) {
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self::$listeNoeudsSelectionnes[] = self::ajouterGroupeOuPoint($noeud);
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}
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}
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private function obtenirCadranPourPoint($latCentre,$lngCentre, &$point) {
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if ($point['lng'] < $lngCentre) {
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if ($point['lat'] > $latCentre) {
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$cadran = 'A';
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} else {
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$cadran = 'D';
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}
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} else {
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if ($point['lat'] > $latCentre) {
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$cadran = 'B';
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} else {
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$cadran = 'C';
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}
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}
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return $cadran;
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}
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private static function ajouterFils(&$noeud, $cadran, &$point) {
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$noeud[$cadran]['points'][] = $point;
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$noeud[$cadran]['nbrePoints']++;
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$noeud[$cadran]['latMoyenne'] += $point['lat'];
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$noeud[$cadran]['lngMoyenne'] += $point['lng'];
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}
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private static function ajouterGroupeOuPoint($noeud) {
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$groupe = array();
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if ($noeud['nbrePoints'] > 1) {
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$groupe['lat'] = $noeud['latMoyenne']/$noeud['nbrePoints'];
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$groupe['lng'] = $noeud['lngMoyenne']/$noeud['nbrePoints'];
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$groupe['id'] = 'GROUPE:'.$groupe['lat'].';'.$groupe['lng'];
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$groupe['nbreMarqueur'] = $noeud['nbrePoints'];
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} else {
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$groupe = $noeud['points'][0];
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}
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return $groupe;
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}
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private static function estUnParentFeuilles($noeud) {
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return self::estUneFeuille($noeud['A']) &&
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self::estUneFeuille($noeud['B']) &&
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self::estUneFeuille($noeud['C']) &&
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self::estUneFeuille($noeud['D']);
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}
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private static function estUneFeuille($noeud) {
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return $noeud == null || ($noeud['A'] == null && $noeud['B'] == null && $noeud['C'] == null && $noeud['D'] == null);
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}
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}
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?>
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