I've been collecting hex grid resources[1] for over 20 years, and wrote this guide to the most elegant approaches that lead to the simplest code, largely based on the guides by Charles Fu[2] and Clark Verbrugge[3]. Next we want to put several hexagons together. Selecting the hexes will highlight the cube coordinates corresponding to the three axes. Applications Mouse over a hex to see the line being drawn to that hex, and which walls it hits. As above, we'll build a table of the numbers we need to add to col and row. For offset coordinates, we need to offset either the column or row number (it will no longer be an integer). It is recommended to keep values below a circumference of 1000. In the pointy orientation, a hexagon has width w = sqrt(3) * size and height h = 2 * size. Mouse overTouch a hex in the diagram to see the path to it. In the diagram, each range is a pair of lines. However offset coordinates can't be safely added and subtracted. Each line is an inequality (a half-plane[19]). However, in most statically typed languages, you'll need a separate class/struct type for float coordinates, and cube_round will have type FloatCube → Cube. The algorithm is called. I'll show how to do this for axial or cube coordinates. Things to keep in mind Let's take a cube grid and slice out a diagonal plane at x + y + z = 0. Since a hex region is expressed as ranges over x, y, z, we can separately intersect each of the x, y, z ranges then use the nested loop to generate a list of hexes in the intersection. Alternatively, you could write cube_round to take three floats as inputs instead of defining a new type just for this function. The constraint also ensures that there's a canonical coordinate for each hex. Visiting the hexes this way can also be used to calculate movement range. geometry: SA.geometry(), It is likely that you will use axial or offset coordinates in your project, but many algorithms are simpler to express in cube coordinates. We might also want to calculate the 6 “diagonal” hexes. I haven't come up with an easy fix for this. To get a list of all such hexes, take radius steps away from the center, then follow the rotated vectors in a path around the ring. var colorized=dataset.select(‘NDVI’).clip(SA); var dataset = ee.Image(‘MODIS/MCD43A4_006_NDVI/2018_05_14’); The simplest way to do this is to draw a line to every hex that's in range. There are times when this algorithm slightly goes outside the marked hexagons. This is the oldest reference I can find for axial grids: Luczak, E. and Rosenfeld, A., There's a paper that calls cube coordinates, [1]: http://www-cs-students.stanford.edu/~amitp/gameprog.html#hex, [2]: http://www-cs-students.stanford.edu/~amitp/Articles/Hexagon2.html, [3]: http://www-cs-students.stanford.edu/~amitp/Articles/HexLOS.html, [4]: http://www-cs-students.stanford.edu/~amitp/game-programming/grids/, [5]: http://web.archive.org/web/20090205120106/http://sc.tri-bit.com/Hex_Grids, [6]: http://ondras.github.io/rot.js/manual/#hex/indexing, [7]: https://www.researchgate.net/publication/235779843_Storage_and_addressing_scheme_for_practical_hexagonal_image_processing?_sg=flKEA6rk1KmOpC4LBjQJN_-NBuiR1KJtJt-XeYRXnd0z_MNUrB2gjb2FKV3iBoKg988P2xHCpQ, [8]: https://en.wikipedia.org/wiki/Bitwise_operation#AND, [9]: https://en.wikipedia.org/wiki/Modulo_operation, [10]: https://www.researchgate.net/publication/235779843_Storage_and_addressing_scheme_for_practical_hexagonal_image_processing?_sg=flKEA6rk1KmOpC4LBjQJN_-NBuiR1KJtJt-XeYRXnd0z_MNUrB2gjb2FKV3iBoKg988P2xHCpQ, [11]: https://doi.org/10.1117/1.JEI.22.1.010502, [12]: http://3dmdesign.com/development/hexmap-coordinates-the-easy-way, [13]: http://ondras.github.io/rot.js/manual/#hex/indexing, [14]: http://ondras.github.io/rot.js/manual/#hex/indexing, [15]: https://en.wikipedia.org/wiki/Digital_differential_analyzer_(graphics_algorithm), [16]: http://zvold.blogspot.com/2010/02/line-of-sight-on-hexagonal-grid.html, [17]: http://stackoverflow.com/questions/3233522/elegant-clean-special-case-straight-line-grid-traversal-algorithm, [18]: https://doi.org/10.1111/1467-8659.1210027, [19]: http://devmag.org.za/2013/08/31/geometry-with-hex-coordinates/, [20]: https://en.wikipedia.org/wiki/Cuboid, [21]: http://devmag.org.za/2013/08/31/geometry-with-hex-coordinates/, [22]: http://gamedev.stackexchange.com/questions/15237/how-do-i-rotate-a-structure-of-hexagonal-tiles-on-a-hexagonal-grid/, [23]: https://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B%AF, [24]: http://www-cs-students.stanford.edu/~amitp/Articles/HexLOS.html, [26]: https://s3.amazonaws.com/jbochi/layout.html, [27]: http://www.adammil.net/blog/v125_Roguelike_Vision_Algorithms.html, [28]: http://www.roguebasin.com/index.php?title=Pre-Computed_Visibility_Tries, [29]: http://www.roguebasin.com/index.php?title=Field_of_Vision, [30]: http://www.wolframalpha.com/input/?i=inv+%7B%7Bsqrt%283%29%2C+sqrt%283%29%2F2%7D%2C+%7B0%2C+3%2F2%7D%7D, [31]: http://www.wolframalpha.com/input/?i=inv+%7B%7B3%2F2%2C+0%7D%2C+%7Bsqrt%283%29%2F2%2C+sqrt%283%29%7D%7D, [32]: https://bl.ocks.org/patricksurry/0603b407fa0a0071b59366219c67abca, [33]: http://gamedev.stackexchange.com/a/137603/2472, [34]: https://observablehq.com/@sanderevers/hexagon-tiling-of-an-hexagonal-grid, [35]: https://observablehq.com/@sanderevers/hexmod-representation, [36]: https://www.redblobgames.com/pathfinding/a-star/introduction.html, [37]: http://www-cs-students.stanford.edu/~amitp/Articles/HexLOS.html, [38]: http://www-cs-students.stanford.edu/~amitp/Articles/Hexagon2.html, [39]: http://devmag.org.za/2013/08/31/geometry-with-hex-coordinates/, [40]: http://www.gamelogic.co.za/downloads/HexMath2.pdf, [41]: http://gamelogic.co.za/grids/documentation-contents/quick-start-tutorial/gamelogics-hex-grids-for-unity-and-amit-patels-guide-for-hex-grids/, [42]: http://www-cs-students.stanford.edu/~amitp/game-programming/grids/, [43]: http://playtechs.blogspot.com/2007/04/hex-grids.html, [44]: http://web.archive.org/web/20090205120106/http://sc.tri-bit.com/Hex_Grids, [45]: http://ondras.github.io/rot.js/manual/#hex/indexing, [46]: http://stackoverflow.com/questions/2049196/generating-triangular-hexagonal-coordinates-xyz, [47]: http://keekerdc.com/2011/03/hexagon-grids-coordinate-systems-and-distance-calculations/, [48]: http://stackoverflow.com/questions/2459402/hexagonal-grid-coordinates-to-pixel-coordinates, [49]: http://gamedev.stackexchange.com/questions/51264/get-ring-of-tiles-in-hexagon-grid, [50]: http://www.battleanalysis.com/battlefield.html, [51]: http://gamedev.stackexchange.com/questions/49718/vertical-vs-horizontal-hex-grids-pros-and-cons, [52]: http://arges-systems.com/blog/2011/01/10/hex-grid-line-of-sight-revisited/, [53]: http://hexnet.org/content/permutohedron, [54]: http://incompetech.com/graphpaper/hexagonal/, [55]: http://old.reddit.com/r/gamedev/comments/19wmvn/a_data_structure_for_a_game_board_with_hexagonal/c8s9qbe, [56]: https://www.springer.com/us/book/9781852339142, [57]: https://doi.org/10.1007/1-84628-203-9, [58]: http://hexgridutilities.codeplex.com/documentation, [59]: https://doi.org/10.1109/TC.1976.1674642, [61]: https://doi.org/10.1109/PROC.1979.11356, [64]: http://old.reddit.com/r/gamedev/comments/1dz1tr/, [65]: https://news.ycombinator.com/item?id=5809724, [66]: http://www.metafilter.com/128649/Hexagonal-Grids, [67]: https://trello.com/card/hexagonal-grids-2-0/4f1dbfdc0fc2508c1b238d7d/52.

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