[Solved] Why the values {1, 1, 0, -1, -1, -1, 0, 1} and {0, 1, 1, 1, 0, -1, -1, -1} were chosen for dx[dir] and dy[dir]? [closed]

by


There are up to 8 directions you can move in from any position on the grid. The dx and dy arrays represent the x and y axis offsets of the adjacent cells. Iterating over the elements pairwise gives you:

index  dir  x  y
    0  e    1  0
    1  se   1  1
    2  n    0  1
    3  nw  -1  1
    4  w   -1  0
    5  sw  -1 -1
    6  s    0 -1
    7  ne   1 -1

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solved Why the values {1, 1, 0, -1, -1, -1, 0, 1} and {0, 1, 1, 1, 0, -1, -1, -1} were chosen for dx[dir] and dy[dir]? [closed]