/** * Test for the geohash::quadrant() method. * * @dataProvider geohashProvider * @param string $geohash */ public function testQuadrant($geohash) { $len = strlen($geohash); $this->assertGreaterThan(0, $len); $point = geohash::decode($geohash); // test every precision from invalid to global for ($precision = $len + 1; $precision >= 0; $precision--) { $quadrant = geohash::quadrant($geohash, $precision); if ($precision >= $len) { // invalid precision, returns null $this->assertNull($quadrant); } else { $box = $precision > 0 ? geohash::decode_box(substr($geohash, 0, $precision)) : new geobox(new geopoint(90, 180), new geopoint(-90, -180)); $center = $box->center(); switch ($quadrant) { case geohash::northwest: $this->assertGreaterThanOrEqual($center->latitude, $point->latitude); $this->assertLessThanOrEqual($center->longitude, $point->longitude); break; case geohash::northeast: $this->assertGreaterThanOrEqual($center->latitude, $point->latitude); $this->assertGreaterThanOrEqual($center->longitude, $point->longitude); break; case geohash::southwest: $this->assertLessThanOrEqual($center->latitude, $point->latitude); $this->assertLessThanOrEqual($center->longitude, $point->longitude); break; case geohash::southeast: $this->assertLessThanOrEqual($center->latitude, $point->latitude); $this->assertGreaterThanOrEqual($center->longitude, $point->longitude); break; } } } }
/** * Increase the size the of the circle. * @param int $amount * @return boolean success|failure */ public function expand($amount = 1) { if ($this->precision == 1) { // currently unwilling to expand to cover the entire globe return false; } $this->precision = max($this->precision - $amount, 1); // shrink the geohash, grow the box $center = substr($this->center_geohash, 0, $this->precision); $box = geohash::decode_box($center); $dlat = $box->north - $box->south; $dlon = $box->east - $box->west; $set = new geohash_set(); $set->add($center); $quadrant = geohash::quadrant($this->center_geohash, $this->precision); if ($quadrant == geohash::northeast || $quadrant == geohash::northwest) { // north side $north = geohash::neighbor($center, geohash::north); if ($north) { $set->add_set(geohash::halve($north, geohash::south)); if ($quadrant == geohash::northeast) { $set->add_set(geohash::quarter(geohash::neighbor($north, geohash::east), geohash::southwest)); } else { // northwest $set->add_set(geohash::quarter(geohash::neighbor($north, geohash::west), geohash::southeast)); } $box->north += $dlat / 2; } } else { // south side $south = geohash::neighbor($center, geohash::south); if ($south) { $set->add_set(geohash::halve($south, geohash::north)); if ($quadrant == geohash::southeast) { $set->add_set(geohash::quarter(geohash::neighbor($south, geohash::east), geohash::northwest)); } else { // southwest $set->add_set(geohash::quarter(geohash::neighbor($south, geohash::west), geohash::northeast)); } $box->south -= $dlat / 2; } } if ($quadrant == geohash::northeast || $quadrant == geohash::southeast) { // east side $set->add_set(geohash::halve(geohash::neighbor($center, geohash::east), geohash::west)); $box->east += $dlon / 2; } else { // west side $set->add_set(geohash::halve(geohash::neighbor($center, geohash::west), geohash::east)); $box->west -= $dlon / 2; } $this->geohash_set = $set; $this->max_radius = min($this->center->distance_to_longitude($box->east), $this->center->distance_to_longitude($box->west)); if ($box->north < 90) { $this->max_radius = min($this->center->distance_to_latitude(min($box->north, 90)), $this->max_radius); } if ($box->south > -90) { $this->max_radius = min($this->center->distance_to_latitude(max($box->south, -90)), $this->max_radius); } return true; }