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alex |
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<?php
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/**
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* Exemple lancement:
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* /opt/lampp/bin/php -d memory_limit=3500M ~/web/moissonnage/scripts/cli.php tuilage -a genererMaillage
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*
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* @author alex
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*
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*/
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class Tuilage extends Script {
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private $bdd = null;
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private $resolution = 0;
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private $resolutionInitiale = 0;
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private $origine = 0;
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private $longueurMaille;
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public function executer() {
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try {
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$this->initialiserScript();
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$cmd = $this->getParametre('a');
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switch ($cmd) {
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case 'genererMaillage' :
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$this->genererTuilage();
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break;
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default :
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throw new Exception("Erreur : la commande '{$cmd}' n'existe pas!");
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}
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} catch(Exception $e) {
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$this->traiterErreur($e->getMessage());
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}
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}
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private function initialiserScript() {
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$fichierIni = $this->getScriptChemin().'tuilage.ini';
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if (file_exists($fichierIni)) {
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Config::charger($fichierIni);
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} else {
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$m = "Veuillez configurer le projet en créant le fichier '{$this->projetNom}.ini' ".
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"dans le dossier du module de script du projet à partir du fichier '{$this->projetNom}.defaut.ini'.";
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throw new Exception($m);
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}
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$this->longueurMaille = Config::get('taille_mailles_px');
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$this->resolutionInitiale = 2 * M_PI * Config::get('rayon_terre') / 256;
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$this->origine = 2 * M_PI * Config::get('rayon_terre') / 2.0;
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}
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private function genererTuilage() {
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if (!$this->estTableCreee()) {
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$this->creerStructureTable();
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}
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$niveauxZoom = range(Config::get('zoom_minimal'), Config::get('zoom_maximal'), 1);
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foreach ($niveauxZoom as $zoom) {
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print("Génération des mailles au niveau de zoom {$zoom}...\n");
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$this->resolution = $this->resolutionInitiale / pow(2, $zoom);
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$coordonneesLng = $this->calculerCoordonneesLimitesTuiles($zoom, 'lng');
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$coordonneesLat = $this->calculerCoordonneesLimitesTuiles($zoom, 'lat');
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$this->ajouterMaillesDansBdd($zoom, $coordonneesLng, $coordonneesLat);
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}
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}
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private function estTableCreee() {
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$tables = $this->getBdd()->recupererTous("SHOW TABLES FROM ".Config::get('bdd_nom'));
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$table = Config::get('eflore_table_mailles');
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for ($index = 0; $index < count($tables) && $tables[$index]['Tables_in_tb_eflore'] != $table; $index ++);
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return $index < count($tables);
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}
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private function creerStructureTable() {
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$table = Config::get('eflore_table_mailles');
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print("Table {$table} non trouvée dans la base de données, création de sa structure...\n");
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$requete =
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"CREATE TABLE {$table} (".
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"zoom TINYINT UNSIGNED NOT NULL,".
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"axe ENUM('lat','lng') NOT NULL,".
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"position SMALLINT UNSIGNED NOT NULL,".
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"debut DECIMAL(9,6) NOT NULL,".
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"fin DECIMAL(9,6) NOT NULL,".
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"PRIMARY KEY (zoom, axe, position)".
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") ENGINE=MyISAM, CHARACTER SET utf8";
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$this->getBdd()->requeter($requete);
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$requete = "ALTER TABLE {$table} ADD INDEX (debut), ADD INDEX(fin)";
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$this->getBdd()->requeter($requete);
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}
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private function calculerCoordonneesLimitesTuiles($zoom, $axe) {
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$variableConfigLimite = $axe == 'lng' ? 'carte.limite_est' : 'carte.limite_nord';
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$limiteCalcul = Config::get($variableConfigLimite);
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$nombrePixels = pow(2, $zoom+8);
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$tailleTableau = $nombrePixels / $this->longueurMaille;
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$valeurs = array();
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for ($index = 0; $index <= $tailleTableau; $index ++) {
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$valeur = $this->convertirPixelEnLatLng($index * $this->longueurMaille, $axe);
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$valeurs[] = $this->convertirFloatToString($valeur);
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}
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return $valeurs;
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}
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private function convertirPixelEnLatLng($pixel, $axe) {
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$coord_metrique = $pixel * $this->resolution - $this->origine;
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$coord_lnglat = ($coord_metrique / $this->origine) * 180.0;
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if ($axe == 'lat') {
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$coord_lnglat = 180 / M_PI * (2 * atan(exp($coord_lnglat * M_PI / 180.0)) - M_PI / 2.0);
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}
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return $coord_lnglat;
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}
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private function ajouterMaillesDansBdd($zoom, $coordonneesLng, $coordonneesLat) {
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$table = Config::get('eflore_table_mailles');
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$nomsChamps = Config::get('eflore_champs_table');
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$this->getBdd()->requeter("DELETE FROM {$table} WHERE zoom=$zoom");
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$insertions = array();
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for ($index = 0; $index < count($coordonneesLng)-1; $index ++) {
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$insertions[] = "({$zoom},'lng',{$index},".$coordonneesLng[$index].",".$coordonneesLng[$index+1].")";
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}
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for ($index = 0; $index < count($coordonneesLat)-1; $index ++) {
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$insertions[] = "({$zoom},'lat',{$index},".$coordonneesLat[$index].",".$coordonneesLat[$index+1].")";
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}
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$requete = "INSERT INTO {$table}({$nomsChamps}) VALUES ".implode(',', $insertions);
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$this->getBdd()->requeter($requete);
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}
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private function getBdd() {
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if (is_null($this->bdd)) {
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$this->bdd = new Bdd();
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}
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return $this->bdd;
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}
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private function convertirFloatToString($float) {
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return str_replace(',', '.', strval($float));
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}
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}
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?>
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