/**
* Test geolib::expand().
* This test isn't yet working for edge cases,
* expanding to the original precision or to the minimum precision.
* Perhaps those expansions don't make much sense.
*
* @dataProvider geohashProvider
* @param string $geohash
*/
public function testCircle($geohash)
{
$circle = new geohash_circle($geohash);
$center = geohash::decode($geohash);
$last_radius = 0;
// test all precisions up to 0
do {
$radius = $circle->max_radius() / EARTH_RADIUS;
$circle->expand($geohash, $precision);
// the center point should be in the set
$this->assertTrue($circle->contains($center));
// the following tests only work for points away from the poles where radiuses expand usefully
if ($radius > 0) {
$this->assertGreaterThan($last_radius, $radius);
// all points box size x 1 distance from the center should be in the set
$this->assertTrue($circle->contains(new geopoint(min($center->latitude + $radius, 90), self::normalize_longitude($center->longitude + $radius))));
$this->assertTrue($circle->contains(new geopoint(min($center->latitude + $radius, 90), self::normalize_longitude($center->longitude - $radius))));
$this->assertTrue($circle->contains(new geopoint(max($center->latitude - $radius, -90), self::normalize_longitude($center->longitude + $radius))));
$this->assertTrue($circle->contains(new geopoint(max($center->latitude - $radius, -90), self::normalize_longitude($center->longitude - $radius))));
// at least one point box size x 2 distance from the center should be outside the set
/*
$this->assertFalse($circle->contains(new geopoint(min($center->latitude + $radius*2, 90), $center->longitude + $radius*2)) &&
$circle->contains(new geopoint(min($center->latitude + $radius*2, 90), $center->longitude - $radius*2)) &&
$circle->contains(new geopoint(max($center->latitude - $radius*2, -90), $center->longitude + $radius*2)) &&
$circle->contains(new geopoint(max($center->latitude - $radius*2, -90), $center->longitude - $radius*2)));
*/
$last_radius = $radius;
}
} while ($circle->expand());
}
