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namespace Common
type Vec2 =
| Vec2 of int * int
static member zero = Vec2(0, 0)
static member up = Vec2(0, 1)
static member right = Vec2(1, 0)
static member down = Vec2(0, -1)
static member left = Vec2(-1, 0)
static member directions4 =
[ Vec2.up
Vec2.right
Vec2.down
Vec2.left ]
static member inline (~-) = Vec2.map (~-)
static member inline (+)(Vec2 (x1, y1), Vec2 (x2, y2)) = Vec2(x1 + x2, y1 + y2)
static member inline (-)(v1, v2) = v1 + Vec2.op_UnaryNegation (v2)
static member inline (*)(v1, k) = Vec2.map ((*) k) v1
static member inline dot (Vec2 (x1, y1)) (Vec2 (x2, y2)) = x1 * x2 + y1 * y2
static member inline cross (Vec2 (x1, y1)) (Vec2 (x2, y2)) = x1 * y2 - y1 * x2
static member map f (Vec2 (x, y)) = Vec2(f x, f y)
static member inline sign = Vec2.map sign
static member inline lengthSquared(Vec2 (x, y)) = x * x + y * y
static member mahattanDist (Vec2 (x1, y1)) (Vec2 (x2, y2)) = abs (x2 - x1) + abs (y2 - y1)
static member chebyshevDist (Vec2 (x1, y1)) (Vec2 (x2, y2)) = max (abs <| x2 - x1) (abs <| y2 - y1)
static member neighbours4 v = List.map ((+) v) Vec2.directions4
static member inMatrix matrix (Vec2 (col, row)) =
col >= 0
&& col < Array2D.length2 matrix
&& row >= 0
&& row < Array2D.length1 matrix
static member toIndexOf matrix (Vec2 (col, row)) = (Array2D.length2 matrix) * row + col
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