This is an Elm implementation of the DDA (Digital Differential Analysis) algorithm popularized by OneLoneCoder (Javidx9).

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tileSize = 50
from = (25, 75) -- center of tile (0,1)
to = (275, 175) -- center of tile (5,3)

touchedTiles tileSize from to
--> Set.fromList [(0,1),(1,1),(1,2),(2,2),(3,2),(4,2),(4,3),(5,3)]