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