/**
* Tests for geohash::encode_digit() and geohash::decode_digit().
* These functions provide raw conversion digit by digit.
*
* @dataProvider digitProvider
* @param int $number
* @param string $digit
*/
public function testGeocodeEncodeDigitAndDecodeDigit($number, $digit)
{
$this->assertEquals($digit, geohash::encode_digit($number));
$this->assertEquals($number, geohash::decode_digit($digit));
}
/**
* Return the quadrant of an ancestor containing this geohash.
* If no precision is given, the immediant parent will be assumed.
* We can find out which quadrant of any ancestor up to and including the first character.
* To determine the global quadrant, choose precision 0.
*
* Examples:
* '00' is in the southwest quadrant of '0'
* 'drt2zm8h1t3v' is in the northeast quadrant of 'drt2zm8h1t3'
* '9345' is northwest on the globe
*
* @param string $hash geohash
* @param int $precision
* @return string geohash::northwest, geohash::northeast, geohash::southwest or geohash::southeast
*/
public static function quadrant($hash, $precision = null)
{
if ($precision >= strlen($hash)) {
return null;
}
$odd = $precision % 2;
$quadrant = (int) (geohash::decode_digit($hash[$precision]) / 8);
switch ($quadrant) {
case 0:
return geohash::southwest;
case 1:
return $odd ? geohash::southeast : geohash::northwest;
case 2:
return $odd ? geohash::northwest : geohash::southeast;
case 3:
return geohash::northeast;
}
}