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<?php |
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namespace GeoTimeZone\Quadrant; |
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class Element |
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{ |
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const MAX_ABS_LATITUDE = 90.0; |
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const MAX_ABS_LONGITUDE = 180.0; |
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const ABS_LATITUDE_LIMIT = 89.9999; |
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const ABS_LONGITUDE_LIMIT = 179.9999; |
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const LEVEL_A = 'a'; |
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const LEVEL_B = 'b'; |
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const LEVEL_C = 'c'; |
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const LEVEL_D = 'd'; |
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protected $top; |
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protected $bottom; |
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protected $left; |
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protected $right; |
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protected $midLat; |
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protected $midLon; |
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protected $level; |
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/** |
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* Element constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->top = self::MAX_ABS_LATITUDE; |
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$this->bottom = (-1) * self::MAX_ABS_LATITUDE; |
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$this->left = (-1) * self::MAX_ABS_LONGITUDE; |
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$this->right = self::MAX_ABS_LONGITUDE; |
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$this->midLat = 0.0; |
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$this->midLon = 0.0; |
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$this->level = self::LEVEL_A; |
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} |
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/** |
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* Move the current quadrant to a particular location (latitude, longitude) |
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* @param $latitude |
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* @param $longitude |
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*/ |
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public function moveToNextQuadrant($latitude, $longitude) |
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{ |
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if ($latitude >= $this->midLat) { |
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$this->bottom = $this->midLat; |
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if ($longitude >= $this->midLon) { |
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$this->level = self::LEVEL_A; |
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$this->left = $this->midLon; |
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} else { |
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$this->level = self::LEVEL_B; |
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$this->right = $this->midLon; |
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} |
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} elseif ($longitude < $this->midLon) { |
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$this->level = self::LEVEL_C; |
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$this->top = $this->midLat; |
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$this->right = $this->midLon; |
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} else { |
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$this->level = self::LEVEL_D; |
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$this->top = $this->midLat; |
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$this->left = $this->midLon; |
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} |
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} |
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/** |
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* Update the mid coordinates attributes of the quadrant |
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*/ |
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public function updateMidCoordinates() |
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{ |
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$this->midLat = ($this->top + $this->bottom) / 2.0; |
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$this->midLon = ($this->left + $this->right) / 2.0; |
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} |
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/** |
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* Get the quadrant level (a, b, c or d) |
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* @return string |
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*/ |
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public function getLevel() |
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{ |
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return $this->level; |
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} |
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} |
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minube /
geo-timezone
