def bounding_box(lat, lng, zoom)
      top, left = MapKit.shift_latlng(lat, lng, @shift_x - @peak_x, @shift_y - @peak_y, zoom)
      bottom, right = MapKit.shift_latlng(top, left, @width, @height, zoom)
      MapKit::BoundingBox.new(top, left, bottom, right, zoom)
    end
def bounding_box(lat, lng, zoom)
      top, left = MapKit.shift_latlng(lat, lng, @shift_x - @peak_x, @shift_y - @peak_y, zoom)
      bottom, right = MapKit.shift_latlng(top, left, @width, @height, zoom)
      MapKit::BoundingBox.new(top, left, bottom, right, zoom)
    end
returns a boundingbox (with lat/lng) that contains the bounds of the
 image for the passed position