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| 1 | <?php |
| 2 | namespace Fdsn\Webservices\Event\Structs; |
| 3 | |
| 4 | /** |
| 5 | * Data structure to handle Latitude,Longitude bounding box |
| 6 | * |
| 7 | * @param LatLon $min Min Latitude,Longitude |
| 8 | * @param LatLon $max Max Latitude,Longitude |
| 9 | */ |
| 10 | class LatLonRange { |
| 11 | private const earthRadius = 6372.795; |
| 12 | private LatLon $min; |
| 13 | private LatLon $max; |
| 14 | |
| 15 | private $validLatitude = array('min' => -180, 'max' => 180); |
| 16 | private $validLongitude = array('min' => -180, 'max' => 180); |
| 17 | |
| 18 | function __construct( LatLon $min, LatLon $max) { |
| 19 | $this->min = $min; |
| 20 | $this->max = $max; |
| 21 | } |
| 22 | |
| 23 | function __destruct(){ } |
| 24 | |
| 25 | /** |
| 26 | * Returns bounding box coordinates |
| 27 | * |
| 28 | * @return string Bounding box in [%.5f,%.5f],[%.5f,%.5f] [min lat,lon],[max lat,lon] format |
| 29 | */ |
| 30 | function __toString(){ |
| 31 | return sprintf("[%.5f,%.5f],[%.5f,%.5f]", |
| 32 | $this->min->lat(), $this->min->lon(), |
| 33 | $this->max->lat(), $this->max->lon()); |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Get min bouding box coordinates |
| 38 | * |
| 39 | * @return LatLon Min bouding box coordinates |
| 40 | */ |
| 41 | public function min():LatLon { return $this->min; } |
| 42 | |
| 43 | /** |
| 44 | * Get max bouding box coordinates |
| 45 | * |
| 46 | * @return LatLon Max bouding box coordinates |
| 47 | */ |
| 48 | public function max():LatLon { return $this->max; } |
| 49 | |
| 50 | /** |
| 51 | * Get distance (in km) between the 2 points |
| 52 | * |
| 53 | * @return float distance in km |
| 54 | */ |
| 55 | public function distance():float{ |
| 56 | $colat1 = ( 90 - $this->min->lat()) * pi() / 180; |
| 57 | $colat2 = ( 90 - $this->max->lat()) * pi() / 180; |
| 58 | |
| 59 | $phi = ($this->max->lon() - $this->min->lon()) * pi() / 180; |
| 60 | $arg = cos($colat1) * cos($colat2) + sin($colat1) * sin($colat2) * cos($phi); |
| 61 | |
| 62 | if( $arg > 1 ) $arg = 1; |
| 63 | if( $arg < -1 ) $arg = -1; |
| 64 | |
| 65 | return abs(self::earthRadius * acos($arg)); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Check if a point (LatLon obj) is contained by the bounding box (this LatLonRange) |
| 70 | * |
| 71 | * @param LatLon $point point to check if is contained by the bounding box |
| 72 | * |
| 73 | * @return bool true if is contained by the bounding box, false otherwise |
| 74 | */ |
| 75 | public function isPointContained(LatLon $point):bool{ |
| 76 | return ( $this->min->lat() <= $point->lat() && $point->lat() <= $this->max->lat() |
| 77 | && $this->min->lon() <= $point->lon() && $point->lon() <= $this->max->lon() ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Get spatial position first point respect to second point |
| 82 | * possible values are: |
| 83 | * NO N NE |
| 84 | * O C E |
| 85 | * SO S SE |
| 86 | * @return string position of first point respect to second point (see __construct()) |
| 87 | */ |
| 88 | public function position():string{ |
| 89 | //North |
| 90 | if( $this->min->lat() > $this->max->lat() ) return $this->getNorthPosition(); |
| 91 | |
| 92 | //Center |
| 93 | if( $this->min->lat() == $this->max->lat() ) return $this->getCenterPosition(); |
| 94 | |
| 95 | //South |
| 96 | if( $this->min->lat() < $this->max->lat() ) return $this->getSouthPosition(); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Get north position |
| 101 | * possible values are: |
| 102 | * NO N NE |
| 103 | * @return string position of first point respect to second point (see __construct()) |
| 104 | */ |
| 105 | private function getNorthPosition():string{ |
| 106 | if($this->min->lon() < $this->max->lon()) return 'NO'; |
| 107 | if($this->min->lon() == $this->max->lon()) return 'N'; |
| 108 | if($this->min->lon() > $this->max->lon()) return 'NE'; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Get center position |
| 113 | * possible values are: |
| 114 | * O C E |
| 115 | * @return string position of first point respect to second point (see __construct()) |
| 116 | */ |
| 117 | private function getCenterPosition():string{ |
| 118 | if($this->min->lon() < $this->max->lon()) return 'O'; |
| 119 | if($this->min->lon() == $this->max->lon()) return 'C'; |
| 120 | if($this->min->lon() > $this->max->lon()) return 'E'; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Get south position |
| 125 | * possible values are: |
| 126 | * SO S SE |
| 127 | * @return string position of first point respect to second point (see __construct()) |
| 128 | */ |
| 129 | private function getSouthPosition():string{ |
| 130 | if($this->min->lon() > $this->max->lon()) return 'SO'; |
| 131 | if($this->min->lon() == $this->max->lon()) return 'S'; |
| 132 | if($this->min->lon() < $this->max->lon()) return 'SE'; |
| 133 | } |
| 134 | |
| 135 | } |