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977 jpm 1 
<?php
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class CartoGroupage {
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1032 aurelien 4 
	private static $seuilClusterisation = 200;
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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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978 jpm 12 
	private static $pasCorrectionCentre = null;
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	private static $coefficientReductionPas = null;
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	private static $coefficientProfondeurMax = null;
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979 jpm 16 
	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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979 jpm 20 
	private static $pointsDejaTraites = array();
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22 
	private static $bornesMax = array('latMin' => null, 'lngMin' => null, 'latMax' => null, 'lngMax' => null);
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24 
	/*
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	  +---------+---------+
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	  |         |         |
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	  |    A    |    B    |
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	  |         |         |
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	  +---------*---------+
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	  |         |         |
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	  |    D    |    C    |
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	  |         |         |
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	  +---------+---------+
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978 jpm 35 
	  Quatres cadrans sont considérés par le quad tree
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	  * = centre de la fenetre
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	 */
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	public static function creerGroupesQuadtree(&$markers, $neLat, $neLng, $swLat, $swLng, $zoom = 3) {
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		if(count($markers) > self::$seuilClusterisation) {
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978 jpm 41 
			self::calculerProfondeurMax($zoom);
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			self::calculerPasCorrectionCentre($zoom);
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44 
			$noeudRacine = array('nbrePoints' => count($markers), 'points' => $markers);
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			self::attribuerAuCadran($noeudRacine, $neLat, $neLng, $swLat, $swLng);
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1004 jpm 47 
		} else {
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			foreach($markers as $marker) {
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				self::mettreAJourBornes(&$marker);
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				$points = array($marker);
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				$noeudSimple = array('points' => $points, 'nbrePoints' => 1);
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				self::$nbElements['observations']++;
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				$emplacement = isset($marker['type_emplacement']) ? $marker['type_emplacement'] : self::obtenirTypeEmplacementParId(&$marker);
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				self::$nbElements[$emplacement]++;
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				unset($marker['type_emplacement']);
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				self::$listeNoeudsSelectionnes[] = self::ajouterGroupeOuPoint($noeudSimple);
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			}
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		}
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978 jpm 60 
		return self::$listeNoeudsSelectionnes;
61 
	}
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978 jpm 63 
	private function calculerCoefficientReductionPas() {
64 
		if(self::$coefficientReductionPas == null) {
65 
			self::$coefficientReductionPas = (self::$pasZoomMaxClustering - self::$pasZoomDefaut)/(self::$zoomMaxClustering - self::$zoomDefaut);
977 jpm 66 
		}
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978 jpm 68 
		return self::$coefficientReductionPas;
977 jpm 69 
	}
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978 jpm 71 
	private function calculerPasCorrectionCentre($zoom) {
72 
		self::$pasCorrectionCentre = ($zoom - self::$zoomDefaut) * self::calculerCoefficientReductionPas() + self::$pasZoomDefaut;
977 jpm 73 
	}
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978 jpm 75 
	private function calculerCoefficientProfondeurMax() {
76 
		if(self::$coefficientProfondeurMax == null) {
77 
			self::$coefficientProfondeurMax = (self::$profondeurMax - self::$profondeurMin)/(self::$zoomMaxClustering - self::$zoomDefaut);
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		}
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978 jpm 80 
		return self::$coefficientProfondeurMax;
977 jpm 81 
	}
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83 
	private function calculerProfondeurMax($zoom) {
84 
		if($zoom > self::$zoomDefaut) {
85 
			self::$profondeurMax = round(($zoom - self::$zoomDefaut) * self::calculerCoefficientProfondeurMax() + self::$profondeurMin,0);
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		} else {
978 jpm 87 
			self::$profondeurMax = 1;
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		}
89 
	}
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979 jpm 91 
	public static function getNbElements() {
92 
		return self::$nbElements;
93 
	}
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1106 aurelien 95 
	public static function mettreAJourBornes(&$point) {
96 
		self::$bornesMax['latMin'] = (is_numeric($point['lat']) && $point['lat'] < self::$bornesMax['latMin'] || self::$bornesMax['latMin'] == null) ? $point['lat'] : self::$bornesMax['latMin'] ;
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		self::$bornesMax['lngMin'] = (is_numeric($point['lng']) && $point['lng'] < self::$bornesMax['lngMin'] || self::$bornesMax['lngMin'] == null) ? $point['lng'] : self::$bornesMax['lngMin'] ;
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		self::$bornesMax['latMax'] = (is_numeric($point['lat']) && $point['lat'] > self::$bornesMax['latMax'] || self::$bornesMax['latMax'] == null) ? $point['lat'] : self::$bornesMax['latMax'] ;
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		self::$bornesMax['lngMax'] = (is_numeric($point['lng']) && $point['lng'] > self::$bornesMax['lngMax'] || self::$bornesMax['lngMax'] == null) ? $point['lng'] : self::$bornesMax['lngMax'] ;
100 
	}
101 
 
102 
	public static function getBornes() {
103 
		return self::$bornesMax;
104 
	}
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978 jpm 106 
	/**
1032 aurelien 107 
	 *
978 jpm 108 
	 * @param mixed $noeud Le noeud à traiter par le quadtree
1032 aurelien 109 
	 * @param float $neLat Latitude du coin nord est de la fenetre
110 
	 * @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
112 
	 * @param float $swLng Longitude du coin sud ouest de la fenetre
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	 * @param int $profondeur profondeur courante de l'arbre
114 
	 */
115 
	private static function attribuerAuCadran(&$noeud, $neLat, $neLng, $swLat, $swLng, $profondeur = 0) {
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978 jpm 117 
		$latCentre = round((($neLat+$swLat)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
118 
		$lngCentre = round((($neLng+$swLng)/2)/self::$pasCorrectionCentre,0)*self::$pasCorrectionCentre;
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977 jpm 120 
		foreach ($noeud['points'] as &$point) {
1106 aurelien 121 
				self::mettreAJourBornes(&$point);
979 jpm 122 
				self::$nbElements['observations']++;
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				$emplacement = isset($point['type_emplacement']) ? $point['type_emplacement'] : self::obtenirTypeEmplacementParId(&$point);
124 
				self::$nbElements[$emplacement]++;
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				unset($point['type_emplacement']);
126 
				$cadran = self::obtenirCadranPourPoint($latCentre, $lngCentre, $point);
127 
				self::ajouterFils($noeud,$cadran,$point);
977 jpm 128 
		}
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977 jpm 130 
		$profondeur++;
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132 
		if($profondeur <= self::$profondeurMax) {
133 
			(isset($noeud['A']) && $noeud['A'] != null) ? self::attribuerAuCadran($noeud['A'], $neLat, $lngCentre , $latCentre, $swLng, $profondeur) : '';
134 
			(isset($noeud['B']) && $noeud['B'] != null) ? self::attribuerAuCadran($noeud['B'], $neLat, $neLng, $latCentre, $lngCentre, $profondeur) : '';
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			(isset($noeud['C']) && $noeud['C'] != null) ? self::attribuerAuCadran($noeud['C'], $latCentre, $neLng, $swLat, $lngCentre, $profondeur) : '';
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			(isset($noeud['D']) && $noeud['D'] != null) ? self::attribuerAuCadran($noeud['D'], $latCentre, $lngCentre, $swLat, $swLng, $profondeur) : '';
977 jpm 137 
		}
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978 jpm 139 
		if(self::estUnParentFeuilles($noeud)) {
140 
			self::$listeNoeudsSelectionnes[] = self::ajouterGroupeOuPoint($noeud);
977 jpm 141 
		}
142 
	}
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144 
	private static function obtenirTypeEmplacementParId($point) {
145 
		$tableau_point_id = explode(':',$point['id'],2);
146 
		switch($tableau_point_id[0]) {
147 
			case 'STATION':
148 
				$type_emplacement = 'stations';
149 
			break;
150 
			case 'COMMUNE':
151 
				$type_emplacement = 'communes';
152 
			break;
153 
		}
154 
		return $type_emplacement;
155 
	}
156 
 
978 jpm 157 
	private function obtenirCadranPourPoint($latCentre,$lngCentre, &$point) {
158 
		if ($point['lng'] < $lngCentre) {
159 
			if ($point['lat'] > $latCentre) {
160 
					$cadran = 'A';
161 
				} else {
162 
					$cadran = 'D';
163 
				}
164 
		} else {
165 
			if ($point['lat'] > $latCentre) {
166 
				$cadran = 'B';
167 
			} else {
168 
				$cadran = 'C';
169 
			}
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		}
978 jpm 171 
		return $cadran;
172 
	}
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1003 jpm 174 
	private static function ajouterFils(&$noeud, $cadran, &$point) {
1032 aurelien 175 
		if(!isset($noeud[$cadran])) {
176 
			$noeud[$cadran] = array('points' => array(),'nbrePoints' => 0, 'latMoyenne' => 0, 'lngMoyenne' => 0);
177 
		}
178 
		$noeud[$cadran]['points'][] = $point;
179 
		$noeud[$cadran]['nbrePoints']++;
180 
		$noeud[$cadran]['latMoyenne'] += $point['lat'];
181 
		$noeud[$cadran]['lngMoyenne'] += $point['lng'];
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	}
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979 jpm 184 
	private static function ajouterGroupeOuPoint(&$noeud) {
977 jpm 185 
		$groupe = array();
186 
		if ($noeud['nbrePoints'] > 1) {
187 
			$groupe['lat'] = $noeud['latMoyenne']/$noeud['nbrePoints'];
188 
			$groupe['lng'] = $noeud['lngMoyenne']/$noeud['nbrePoints'];
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			$groupe['id'] = 'GROUPE:'.$groupe['lat'].';'.$groupe['lng'];
977 jpm 190 
			$groupe['nbreMarqueur'] = $noeud['nbrePoints'];
191 
		} else {
192 
			$groupe = $noeud['points'][0];
193 
		}
194 
		return $groupe;
195 
	}
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979 jpm 197 
	private static function estUnParentFeuilles(&$noeud) {
1032 aurelien 198 
		return  self::estUneFeuille($noeud['A']) &&
199 
				self::estUneFeuille($noeud['B']) &&
200 
				self::estUneFeuille($noeud['C']) &&
978 jpm 201 
				self::estUneFeuille($noeud['D']);
202 
	}
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204 
	private static function estUneFeuille(&$noeud) {
205 
		return $noeud == null ||
206 
		(!isset($noeud['A']) || $noeud['A'] == null) &&
207 
		(!isset($noeud['B']) || $noeud['B'] == null) &&
208 
		(!isset($noeud['C']) || $noeud['C'] == null) &&
209 
		(!isset($noeud['D']) || $noeud['D'] == null);
977 jpm 210 
	}
211 
}
212 
?>