code: private static boolean pointEqualsEnvelope_(Point2D pt_a, Envelope2D env_b,
  			double tolerance, ProgressTracker progress_tracker) {
  		Envelope2D env_a = new Envelope2D();
  		env_a.setCoords(pt_a);
  		return envelopeEqualsEnvelope_(env_a, env_b, tolerance,
  				progress_tracker);
  	}
docs: Returns true if pt_a equals enve_b.