/**
* Return a rectangle that contains all points whose latitude distance from
* this rectangle is at most margin.lat(), and whose longitude distance from
* this rectangle is at most margin.lng(). In particular, latitudes are
* clamped while longitudes are wrapped. Note that any expansion of an empty
* interval remains empty, and both components of the given margin must be
* non-negative.
*
* NOTE: If you are trying to grow a rectangle by a certain *distance* on the
* sphere (e.g. 5km), use the ConvolveWithCap() method instead.
* @return S2LatLngRect
*/
public function expanded(S2LatLng $margin)
{
// assert (margin.lat().radians() >= 0 && margin.lng().radians() >= 0);
if ($this->isEmpty()) {
return $this;
}
return new S2LatLngRect($this->lat->expanded($margin->lat()->radians())->intersection($this->fullLat()), $this->lng->expanded($margin->lng()->radians()));
}
