89 lines
2.2 KiB
PHP
89 lines
2.2 KiB
PHP
<?php namespace MapGuesser\Util\Geo;
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class Bounds
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{
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const ONE_DEGREE_OF_LATITUDE_IN_METER = 111132.954;
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private float $southLat = 90.0;
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private float $westLng = 180.0;
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private float $northLat = -90.0;
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private float $eastLng = -180.0;
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public function __construct(Position $position = null)
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{
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if ($position === null) {
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return;
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}
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$lat = $position->getLat();
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$lng = $position->getLng();
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$this->northLat = $lat;
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$this->westLng = $lng;
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$this->southLat = $lat;
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$this->eastLng = $lng;
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}
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public static function createDirectly(float $southLat, float $westLng, float $northLat, float $eastLng): Bounds
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{
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$instance = new static();
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$instance->southLat = $southLat;
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$instance->westLng = $westLng;
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$instance->northLat = $northLat;
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$instance->eastLng = $eastLng;
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return $instance;
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}
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public function extend(Position $position): void
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{
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$lat = $position->getLat();
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$lng = $position->getLng();
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if ($lat < $this->southLat) {
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$this->southLat = $lat;
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}
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if ($lng < $this->westLng) {
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$this->westLng = $lng;
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}
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if ($lat > $this->northLat) {
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$this->northLat = $lat;
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}
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if ($lng > $this->eastLng) {
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$this->eastLng = $lng;
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}
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}
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public function calculateApproximateArea(): float
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{
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$dLat = $this->northLat - $this->southLat;
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$dLng = $this->eastLng - $this->westLng;
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$m = $dLat * static::ONE_DEGREE_OF_LATITUDE_IN_METER;
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$a = $dLng * static::ONE_DEGREE_OF_LATITUDE_IN_METER * cos(deg2rad($this->northLat));
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$c = $dLng * static::ONE_DEGREE_OF_LATITUDE_IN_METER * cos(deg2rad($this->southLat));
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return $m * ($a + $c) / 2;
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}
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public function toArray(): array
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{
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return [
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'south' => $this->southLat,
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'west' => $this->westLng,
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'north' => $this->northLat,
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'east' => $this->eastLng,
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];
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}
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public function toJson(): string
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{
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return json_encode($this->toArray());
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}
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}
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