Hexagon coloring

 from Red Blob Games
09 Jan 2019

This stackoverflow question asks about coloring a hex grid[1]. You can subtract any two coordinates and then mod by 3 to get the color:

Note that % is not the mod operator in some languages. You'll need ((q-r)%3 + 3) % 3 to calculate mod 3. Further reading: mod and remainder are not the same[2].

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Endnotes

  1. [1]: https://stackoverflow.com/questions/54104237/how-do-i-color-a-hexagonal-grid-such-that-it-doesnt-have-neighbors-of-the-same
  2. [2]: https://bigmachine.io/2018/08/21/mod-and-remainder-are-not-the-same/