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root / class / site_point.class.php @ 7f9aab46

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<?php
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class site_point {
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  private $base_dir;
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  private $name = false;
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  private $prefix = false;
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  private $params = false;
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  private $zooms;
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  public function __construct($dir) {
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    $this->base_dir = $dir;
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    $dir_fd = opendir($this->base_dir);
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    while (false !== ($file = readdir($dir_fd))) {
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       if (preg_match('/(.*)_[0-9]+_[0-9]+_[0-9]+\.jpg$/', $file, $reg)) {
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         $this->prefix = $reg[1];
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         break;
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       }
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    }
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    closedir($dir_fd);
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    if ($this->prefix === false) return false;
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    $pfname = $this->base_dir.'/'.$this->prefix.'.params';
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    if (is_file($pfname)) {
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      $this->params = @parse_ini_file($pfname);
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    } 
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  }
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  public function get_params() {
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    return $this->params;
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  }
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  public function get_name() {
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    return basename($this->base_dir);
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  }
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  public function get_prefix() {
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    return $this->prefix;
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  }
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  public function get_magnifications() {
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    $dir_fd = opendir($this->base_dir);
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    while (false !== ($file = readdir($dir_fd))) {                // extraction des paramètres de grossissement par le serveur
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       //echo $file;
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       if (preg_match('/(.*)_([0-9]+)_([0-9]+)_([0-9]+)\.jpg$/', $file, $reg)) {
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         $prefix = $reg[1];
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         if ($prefix == $this->prefix) {
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           $zoom = (int)$reg[2];
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           $posx = (int)$reg[3]+1;
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           $posy = (int)$reg[4]+1;
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           if (!isset($zoom_array[$zoom]['nx']) || $zoom_array[$zoom]['nx'] < $posx) $zoom_array[$zoom]['nx'] = $posx;
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           if (!isset($zoom_array[$zoom]['ny']) || $zoom_array[$zoom]['ny'] < $posy) $zoom_array[$zoom]['ny'] = $posy;
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         }
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       }
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    }
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    $this->zooms = $zoom_array;
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    return $this->zooms;
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  }
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  public function coordsToCap($lat, $lon, $alt) {
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    if (!isset($this->params['latitude']) || !isset($this->params['longitude'])) return false;
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    $rt = 6371;  // Rayon de la terre
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    $alt1 = isset($this->params['altitude']) ? $this->params['altitude'] : $alt;
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    $lat1 = $this->params['latitude']*M_PI/180;
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    $lon1 = $this->params['longitude']*M_PI/180;
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    $alt2 = $alt;
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    $lat2 = $lat * M_PI/180;
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    $lon2 = $lon * M_PI/180;
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    $dLat = $lat2-$lat1;
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    $dLon = $lon2-$lon1; 
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    $a = sin($dLat/2) * sin($dLat/2) + sin($dLon/2) * sin($dLon/2) * cos($lat1) * cos($lat2);  // 
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    $angle = 2 * atan2(sqrt($a), sqrt(1-$a));
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    $d = $angle * $rt;                    // distance du point en Kms
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    $y = sin($dLon)*cos($lat2);
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    $x = cos($lat1)*sin($lat2) - sin($lat1)*cos($lat2)*cos($dLon);
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    $cap = atan2($y, $x);                 // cap pour atteindre le point en radians
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    $e = atan2(($alt2 - $alt1)/1000 - $d*$d/(2*$rt), $d);  // angle de l'élévation en radians
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    //    printf("%s, %s, %s, %s\n",$lat1, $this->params['latitude'], $lat, $dLat);
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    return array($d, $cap*180/M_PI, $e*180/M_PI, $rapport);   // les résultats sont en degrés
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  }
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}