First version of zone support

[pchesneau]

I Recreate a MR to simplify Rebases.
This is a draft (yet effective) implementation for #3 .

What is done :

• Fix rounding issues ( at least for external points of hexagons)
• Detects clusters
• Draws boundaries around clusters.

However there is still some issues :

• the drawing algorithm is implemented in hexamap.py yet it would be better in HexagonGrid; but it cannot be placed there as it would add an impossible circle dependency between Hexagon and HexagonGrid.

Is it really a good idea to have Hexagon know it's grid? I would have expected the opposite. (In fact I half expected to see HexagonGrid implement the factory pattern to produce hexagon. (so that every Hexagon is registered in it's grid. )
@Ezian WDYT ?

[pchesneau]

Hello @Ezian ,
I've rebased + done some refactor. I still have to add some documentation.

Also, it seems there is an offset issue with the current version, are you aware ?

[Ezian]

What do you mean ?

Coordinate are correctly displayed in the main branch. Which offset do you are talking about ?

[pchesneau]

Have a look to https://github.com/Ezian/hex-chronicle/blob/main/hexgrid-example.svg ;)

[Ezian]

I really enjoy to read this PR, thanks !

I have few feedback, mostly improvement.

Moreover, before merging, it would be great to add:

• Example in documentation (and documentation BTW)
• Regenerate the hexgrid-example.svg which is shown in the Readme.md.

I have in mind to write a Contribute.md file in order to explicit this rules.

[Ezian]

Have a look to https://github.com/Ezian/hex-chronicle/blob/main/hexgrid-example.svg ;)

Huho shit. I had introduce it when I take Pylint stuff in account...

[Ezian]

I've botched the compute of the grid.origin point...

[Ezian]

Fixed.