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namespace Common
[<StructuralEquality; StructuralComparison>]
type Vec2 =
| Vec2 of int * int
static member inline x(Vec2 (x, _)) = x
static member inline y(Vec2 (_, y)) = y
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 upRight = Vec2(1, 1)
static member upLeft = Vec2(-1, 1)
static member downLeft = Vec2(-1, -1)
static member downRight = Vec2(1, -1)
static member directionsUp =
Set [ Vec2.upLeft
Vec2.up
Vec2.upRight ]
static member directionsRight =
Set [ Vec2.upRight
Vec2.right
Vec2.downRight ]
static member directionsDown =
Set [ Vec2.downLeft
Vec2.down
Vec2.downRight ]
static member directionsLeft =
Set [ Vec2.upLeft
Vec2.left
Vec2.downLeft ]
static member directions4 =
Set [ Vec2.up
Vec2.right
Vec2.down
Vec2.left ]
static member directions8 =
Set [ Vec2.up
Vec2.upRight
Vec2.right
Vec2.downRight
Vec2.down
Vec2.downLeft
Vec2.left
Vec2.upLeft ]
static member inline private _map f (Vec2 (x, y)) = Vec2(f x, f y)
static member inline private _combine fn (Vec2 (x1, y1)) (Vec2 (x2, y2)) = Vec2(fn x1 x2, fn y1 y2)
static member inline (~-)(v) = Vec2._map (~-) v
static member inline (+)(v1, v2) = Vec2._combine (+) v1 v2
static member inline (-)(v1, v2) = Vec2._combine (-) v1 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 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 inline private _nb d v = Set.map ((+) v) d
static member neighboursUp = Vec2._nb Vec2.directionsUp
static member neighboursRight = Vec2._nb Vec2.directionsRight
static member neighboursDown = Vec2._nb Vec2.directionsDown
static member neighboursLeft = Vec2._nb Vec2.directionsLeft
static member neighbours4 = Vec2._nb Vec2.directions4
static member neighbours8 = Vec2._nb Vec2.directions8
static member boundingRectangle vs =
(Seq.reduce (Vec2._combine min) vs, Seq.reduce (Vec2._combine max) vs)
static member lineBetween(Vec2 (x1, y1), Vec2 (x2, y2)) =
if x1 = x2 then
Seq.map (fun y -> Vec2(x1, y)) (seq { min y1 y2 .. max y1 y2 })
elif y1 = y2 then
Seq.map (fun x -> Vec2(x, y1)) (seq { min x1 x2 .. max x1 x2 })
else
failwith "Points must be in a vertical or horizontal line!"
static member inMatrix matrix (Vec2 (col, row)) =
col >= 0
&& col < Array2D.length2 matrix
&& row >= 0
&& row < Array2D.length1 matrix
static member inline toIndexOf matrix (Vec2 (col, row)) = (Array2D.length2 matrix) * row + col
|
