Integrating with the app

As we continue to work with increasing levels of abstraction, think of our app's organization. We have two types of data and we have the GeocachingApp class with high level functionality. At this point, what we want is to enable the app to filter like we did in the tests, but in a simple and straightforward way.

Take a look at the app as it is at this point:

class GeocachingApp(PointCollection):
    def __init__(self, data_file=None, my_location=None):
        """Application class.

        :param data_file: An OGR compatible file
         with geocaching points.
        :param my_location: Coordinates of your location.
        """
        super(GeocachingApp, self).__init__(file_path=data_file)

        self._datasource = None
        self._transformed_geoms = None
        self._my_location = None
        self.distances = None

        if my_location:
            self.my_location = my_location

    @property
    def my_location(self):
        return self._my_location...