Obtaining cell_ids

[selivandex]

Hello, can you say how did you generated cell_id in the exmaple.rb ? And what cell_id we need?

[selivandex]

As i understand cell id you used in example.rb is only for New York

[nabeelamjad]

The example cell ID was generated by using the S2 geometry in Python's interpreter, unfortunately the library in question does not exist in Ruby (yet). I am looking for a way to get this implemented but unsure how long that will take.

If you need cell_ids then I'd suggest to have a look at this Python excerpt: https://github.com/tejado/pgoapi/blob/master/pokecli.py#L63 (the methods are imported from using s2sphere library which is Python's S2 Geometry lib.

[selivandex]

I've wrote code like this https://gist.github.com/selivandex/35d2e08de01a1aae59bbd261db40af0a

And here is ruby usage cell_ids = %x(python #{Rails.root.join('lib', 'get_cell_id.py')} -lat #{client.lat} -lng #{client.lng})

But i getting response array of cell ids

[2401181244772581376L, 2401181246920065024L]

Can you help me understand? What is L at the end of each id ?

[nabeelamjad]

L stands for Long in Python, it's just to indicate the type of the integer really (you don't see this in Python 3+ anymore)

You could use something like this:

• This is all assuming you have Python installed and invokable by calling python (if you do have it installed but calling python does not invoke it then you need to set up your PATH correctly to include python).

example.rb

require 'poke-api'
require 'pp'

client = Poke::API::Client.new

client.store_location('New York')
client.login('username', 'password', 'ptc')

# Replace this line as you wish to call the right library, if your file is in a folder ``lib``
# and the example is in the parent directory then you could call from lib.get_cell_id
# A third argument can be optionally provided to indicate the radius (in this case 15)
cell_ids = `python -c 'from get_cell_id import get_cell_ids; \
            print(get_cell_ids(#{client.lat},#{client.lng}, 15))'`
cell_ids = cell_ids.tr('[L]', '').split.map(&:to_i)

client.get_map_objects(
  latitude: client.lat,
  longitude: client.lng,
  since_timestamp_ms: [0] * cell_ids.length,
  cell_id: cell_ids
)

pp client.call

get_cell_id.py (requires s2sphere library to be installed for Python -> pip install s2sphere)

from s2sphere import CellId, LatLng

def get_cell_ids(lat, long, radius = 10):
    origin = CellId.from_lat_lng(LatLng.from_degrees(lat, long)).parent(15)
    walk = [origin.id()]
    right = origin.next()
    left = origin.prev()
    for i in range(radius):
        walk.append(right.id())
        walk.append(left.id())
        right = right.next()
        left = left.prev()
    return sorted(walk)

You get the idea :)

[nabeelamjad]

As of the latest protobufs update both client.lat and client.long will once again return a double so they can directly be entered into the python function, I've updated the previous post to reflect this.

[nabeelamjad]

Will implement this tomorrow in native Ruby (just enough so we can use it to generate S2 cells).

[xssc]

@nabeelamjad Thanks!

[nabeelamjad]

I've put up a PR #28 just to ensure that the work I've done is right and if anything needs to be changed, I'll probably merge it in tomorrow.

[nabeelamjad]

I've merged in S2 Geometry cells in the latest release, I'll separate the repo at some other point when I have more time.