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| <?php | |
| namespace GeoData; | |
| /** | |
| * Immutable representation of a celestial body | |
| */ | |
| class Globe { | |
| /** @var string */ | |
| private $name; | |
| /** @var float|null */ | |
| private $radius; | |
| /** @var float */ | |
| private $minLon = -360; | |
| /** @var float */ | |
| private $maxLon = 360; | |
| /** @var int either -1 or +1 */ | |
| private $east = 1; | |
| /** @var bool */ | |
| private $known = false; | |
| /** | |
| * @param string $name Internal globe name | |
| */ | |
| public function __construct( $name ) { | |
| global $wgGlobes; | |
| $this->name = $name; | |
| $data = $wgGlobes[$name] ?? self::getData()[$name] ?? null; | |
| if ( $data !== null ) { | |
| $this->radius = $data['radius'] ?? null; | |
| $this->minLon = $data['lon'][0] ?? 0; | |
| $this->maxLon = $data['lon'][1]; | |
| $this->east = $data['east'] ?? 1; | |
| $this->known = true; | |
| } | |
| } | |
| /** | |
| * @return array[] | |
| */ | |
| private static function getData() { | |
| static $data = []; | |
| if ( $data ) { | |
| return $data; | |
| } | |
| $earth = [ 'lon' => [ -180, 180 ], 'east' => +1 ]; | |
| $east360 = [ 'lon' => [ 0, 360 ], 'east' => +1 ]; | |
| $west360 = [ 'lon' => [ 0, 360 ], 'east' => -1 ]; | |
| /** | |
| * Format: | |
| * 'lon' => array of [minimum value, maximum value] | |
| * 'east' => sign 1 degree East would have | |
| * 'radius' => mean radius in meters (optional) | |
| * Coordinate systems mostly taken from http://planetarynames.wr.usgs.gov/TargetCoordinates | |
| * Radii taken from Wikipedia. Globes that are too irregular in shape don't have radius set. | |
| */ | |
| $data = [ | |
| 'earth' => $earth + [ 'radius' => Math::EARTH_RADIUS ], | |
| 'mercury' => $west360 + [ 'radius' => 2439700.0 ], | |
| 'venus' => $east360 + [ 'radius' => 6051800.0 ], | |
| 'moon' => $earth + [ 'radius' => 1737100.0 ], | |
| // Assuming MDIM 2.1 | |
| 'mars' => $east360 + [ 'radius' => 3389500.0 ], | |
| 'phobos' => $west360, | |
| 'deimos' => $west360, | |
| // 'ceres' => ???, | |
| // 'vesta' => ???, | |
| 'ganymede' => $west360 + [ 'radius' => 2634100.0 ], | |
| 'callisto' => $west360 + [ 'radius' => 2410300.0 ], | |
| 'io' => $west360 + [ 'radius' => 1821600.0 ], | |
| 'europa' => $west360 + [ 'radius' => 1560800.0 ], | |
| 'mimas' => $west360 + [ 'radius' => 198200.0 ], | |
| 'enceladus' => $west360 + [ 'radius' => 252100.0 ], | |
| 'tethys' => $west360 + [ 'radius' => 531100.0 ], | |
| 'dione' => $west360 + [ 'radius' => 561400.0 ], | |
| 'rhea' => $west360 + [ 'radius' => 763800.0 ], | |
| 'titan' => $west360 + [ 'radius' => 2575500.0 ], | |
| 'hyperion' => $west360, | |
| 'iapetus' => $west360 + [ 'radius' => 734500.0 ], | |
| 'phoebe' => $west360, | |
| 'miranda' => $east360 + [ 'radius' => 235800.0 ], | |
| 'ariel' => $east360 + [ 'radius' => 578900.0 ], | |
| 'umbriel' => $east360 + [ 'radius' => 584700.0 ], | |
| 'titania' => $east360 + [ 'radius' => 788400.0 ], | |
| 'oberon' => $east360 + [ 'radius' => 761400.0 ], | |
| 'triton' => $east360 + [ 'radius' => 1353400.0 ], | |
| // ??? | |
| 'pluto' => $east360 + [ 'radius' => 1187000.0 ], | |
| ]; | |
| return $data; | |
| } | |
| /** | |
| * Globe internal name | |
| * @return string | |
| */ | |
| public function getName() { | |
| return $this->name; | |
| } | |
| /** | |
| * Returns globe radius or null if it's not known | |
| * @return float|null | |
| */ | |
| public function getRadius() { | |
| return $this->radius; | |
| } | |
| /** | |
| * Returns minimum longitude | |
| * @return float | |
| */ | |
| public function getMinLongitude() { | |
| return $this->minLon; | |
| } | |
| /** | |
| * Returns maximum longitude | |
| * @return float | |
| */ | |
| public function getMaxLongitude() { | |
| return $this->maxLon; | |
| } | |
| /** | |
| * Returns the sign of East | |
| * @return int | |
| */ | |
| public function getEastSign() { | |
| return $this->east; | |
| } | |
| /** | |
| * Returns whether this globe is registered (and hence, we know its properties) | |
| * @return bool | |
| */ | |
| public function isKnown() { | |
| return $this->known; | |
| } | |
| /** | |
| * Compares this globe to another | |
| * @param Globe $other | |
| * @return bool | |
| */ | |
| public function equalsTo( Globe $other ) { | |
| return $this->name === $other->name; | |
| } | |
| /** | |
| * Checks whether given coordinates are valid | |
| * @param int|float|string $lat | |
| * @param int|float|string $lon | |
| * @return bool | |
| */ | |
| public function coordinatesAreValid( $lat, $lon ) { | |
| if ( !is_numeric( $lat ) || !is_numeric( $lon ) ) { | |
| return false; | |
| } | |
| $lat = (float)$lat; | |
| $lon = (float)$lon; | |
| return $lon >= $this->minLon && $lon <= $this->maxLon | |
| && abs( $lat ) <= 90; | |
| } | |
| } |