code: public boolean isIntersecting(Envelope2D other) {
  		// No need to check if empty, this will work for empty envelopes too
  		// (IEEE math)
  		return ((xmin <= other.xmin) ? xmax >= other.xmin : other.xmax >= xmin)
  				&& // check that x projections overlap
  				((ymin <= other.ymin) ? ymax >= other.ymin : other.ymax >= ymin); // check
  																					// that
  																					// y
  																					// projections
  																					// overlap
  	}
docs: Checks if this envelope intersects the other.
  @param other The other envelope.
  @return True if this envelope intersects the other.