code: private boolean exceedsScreenDimensions(InternalFeature f, double scale) {
  		Envelope env = f.getBounds();
  		return (env.getWidth() * scale > MAXIMUM_TILE_COORDINATE) ||
  				(env.getHeight() * scale > MAXIMUM_TILE_COORDINATE);
  	}
docs: The test that checks if clipping is needed.
  
  @param f
  feature to test
  @param scale
  scale
  @return true if clipping is needed