def pixel(bounding_box)
      x, y = MapKit.latlng2pixel(@lat, @lng, bounding_box.zoom)
      tile_x, tile_y = MapKit.latlng2pixel(bounding_box.top, bounding_box.left, bounding_box.zoom)
      [x-tile_x, y-tile_y]
    end
def pixel(bounding_box)
      x, y = MapKit.latlng2pixel(@lat, @lng, bounding_box.zoom)
      tile_x, tile_y = MapKit.latlng2pixel(bounding_box.top, bounding_box.left, bounding_box.zoom)
      [x-tile_x, y-tile_y]
    end
returns relative x and y for point in bounding_box