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977 jpm 1 
<?php
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class CartoGroupage {
978 jpm 3 
 
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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;
977 jpm 11 
 
978 jpm 12 
	private static $pasCorrectionCentre = null;
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	private static $coefficientReductionPas = null;
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	private static $coefficientProfondeurMax = null;
979 jpm 15 
 
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	private static $nbElements = array('stations' => 0,'communes' => 0, 'observations' => 0);
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977 jpm 18 
	private static $listeNoeudsSelectionnes = array();
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	private static $pointsDejaTraites = array();
978 jpm 21 
 
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	/*
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	  +---------+---------+
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	  |         |         |
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	  |    A    |    B    |
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	  |         |         |
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	  +---------*---------+
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	  |         |         |
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	  |    D    |    C    |
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	  |         |         |
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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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	 */
979 jpm 36 
	public static function creerGroupesQuadtree(&$markers, $neLat, $neLng, $swLat, $swLng, $zoom = 3) {
977 jpm 37 
 
978 jpm 38 
		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);
977 jpm 45 
 
978 jpm 46 
		} 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($noeudSimple);
977 jpm 51 
			}
978 jpm 52 
		}
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		return self::$listeNoeudsSelectionnes;
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	}
977 jpm 56 
 
978 jpm 57 
	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);
977 jpm 60 
		}
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978 jpm 62 
		return self::$coefficientReductionPas;
977 jpm 63 
	}
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978 jpm 65 
	private function calculerPasCorrectionCentre($zoom) {
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		self::$pasCorrectionCentre = ($zoom - self::$zoomDefaut) * self::calculerCoefficientReductionPas() + self::$pasZoomDefaut;
977 jpm 67 
	}
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978 jpm 69 
	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);
977 jpm 72 
		}
978 jpm 73 
 
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		return self::$coefficientProfondeurMax;
977 jpm 75 
	}
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978 jpm 77 
	private function calculerProfondeurMax($zoom) {
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		if($zoom > self::$zoomDefaut) {
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			self::$profondeurMax = round(($zoom - self::$zoomDefaut) * self::calculerCoefficientProfondeurMax() + self::$profondeurMin,0);
977 jpm 80 
		} else {
978 jpm 81 
			self::$profondeurMax = 1;
977 jpm 82 
		}
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	}
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979 jpm 85 
	public static function getNbElements() {
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		return self::$nbElements;
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	}
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978 jpm 89 
	/**
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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 $profondeur profondeur courante de l'arbre
97 
	 */
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	private static function attribuerAuCadran(&$noeud, $neLat, $neLng, $swLat, $swLng, $profondeur = 0) {
99 
 
100 
		$latCentre = round((($neLat+$swLat)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
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		$lngCentre = round((($neLng+$swLng)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
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977 jpm 103 
		foreach ($noeud['points'] as &$point) {
979 jpm 104 
				self::$nbElements['observations']++;
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				self::$nbElements[$point['type_emplacement']]++;
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				unset($point['type_emplacement']);
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				$cadran = self::obtenirCadranPourPoint($latCentre, $lngCentre, $point);
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				self::ajouterFils($noeud,$cadran,$point);
977 jpm 109 
		}
110 
 
111 
		$profondeur++;
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978 jpm 113 
		if($profondeur <= self::$profondeurMax) {
114 
			($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, $profondeur) : '';
977 jpm 118 
		}
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978 jpm 120 
		if(self::estUnParentFeuilles($noeud)) {
121 
			self::$listeNoeudsSelectionnes[] = self::ajouterGroupeOuPoint($noeud);
977 jpm 122 
		}
123 
	}
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978 jpm 125 
	private function obtenirCadranPourPoint($latCentre,$lngCentre, &$point) {
126 
		if ($point['lng'] < $lngCentre) {
127 
			if ($point['lat'] > $latCentre) {
128 
					$cadran = 'A';
129 
				} else {
130 
					$cadran = 'D';
131 
				}
132 
		} else {
133 
			if ($point['lat'] > $latCentre) {
134 
				$cadran = 'B';
135 
			} else {
136 
				$cadran = 'C';
137 
			}
138 
		}
139 
		return $cadran;
140 
	}
141 
 
142 
	private static function ajouterFils(&$noeud, $cadran, &$point) {
143 
		$noeud[$cadran]['points'][] = $point;
144 
		$noeud[$cadran]['nbrePoints']++;
145 
		$noeud[$cadran]['latMoyenne'] += $point['lat'];
146 
		$noeud[$cadran]['lngMoyenne'] += $point['lng'];
147 
	}
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979 jpm 149 
	private static function ajouterGroupeOuPoint(&$noeud) {
977 jpm 150 
		$groupe = array();
151 
		if ($noeud['nbrePoints'] > 1) {
152 
			$groupe['lat'] = $noeud['latMoyenne']/$noeud['nbrePoints'];
153 
			$groupe['lng'] = $noeud['lngMoyenne']/$noeud['nbrePoints'];
978 jpm 154 
			$groupe['id'] = 'GROUPE:'.$groupe['lat'].';'.$groupe['lng'];
977 jpm 155 
			$groupe['nbreMarqueur'] = $noeud['nbrePoints'];
156 
		} else {
157 
			$groupe = $noeud['points'][0];
158 
		}
159 
		return $groupe;
160 
	}
161 
 
979 jpm 162 
	private static function estUnParentFeuilles(&$noeud) {
978 jpm 163 
		return  self::estUneFeuille($noeud['A']) &&
164 
				self::estUneFeuille($noeud['B']) &&
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				self::estUneFeuille($noeud['C']) &&
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				self::estUneFeuille($noeud['D']);
167 
	}
168 
 
979 jpm 169 
	private static function estUneFeuille(&$noeud) {
977 jpm 170 
		return $noeud == null || ($noeud['A'] == null && $noeud['B'] == null && $noeud['C'] == null && $noeud['D'] == null);
171 
	}
172 
}
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?>