Public Member Functions
	__construct ($inDBObject)
	get_tz ( $in_lng, $in_lat)

Public Attributes
	$db_object

Private Member Functions
	_find_in_polygons ($candidates, $longitude, $latitude)

Static Private Member Functions
static	_wn_PackedPoly ($longitude, $latitude, $polygon)

Detailed Description

This class is a lookup class.

It queries the database, and returns the timezone that corresponds to the provided longitude, latitude pair.

Definition at line 40 of file LGV_TZ_Lookup_Query.class.php.

Constructor & Destructor Documentation

◆ __construct()

LGV_TZ_Lookup_Query::__construct ( $inDBObject )

The constructor.

Parameters

$inDBObject An initialized database instance for this handler.

Definition at line 51 of file LGV_TZ_Lookup_Query.class.php.

Member Function Documentation

◆ _find_in_polygons()

LGV_TZ_Lookup_Query::_find_in_polygons	(	$candidates,
		$longitude,
		$latitude )

private

Fetch compact polygons and stop at the first match, without expanding all candidates into PHP point arrays.

Definition at line 98 of file LGV_TZ_Lookup_Query.class.php.

Referenced by get_tz().

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◆ _wn_PackedPoly()

LGV_TZ_Lookup_Query::_wn_PackedPoly	(	$longitude,
		$latitude,
		$polygon )

staticprivate

The winding-number algorithm courtesy of San Zhujun (https://gist.github.com/zhujunsan/81d6a2f05d590f618a5ad36f25666fc2), operating on the existing packed native-double format with the same edge/vertex comparisons. Decode 1,024 points at a time: per-point unpack calls are expensive, while unpacking an entire large polygon creates a large PHP hash table. Carry the preceding point across blocks, including the closing edge.

Definition at line 119 of file LGV_TZ_Lookup_Query.class.php.