S2Cells

AVG_ANGLE_SPAN = LengthMetric.new(Math::PI / 2)

AVG_AREA = AreaMetric.new((4 * Math::PI) / 6.0)

AVG_DIAG = LengthMetric.new(2.060422738998471683)

AVG_EDGE = LengthMetric.new(1.459213746386106062)

AVG_WIDTH = LengthMetric.new(1.434523672886099389)

FACE_CELLS = {Cell.from_face_pos_level(0, 0_u64, 0), Cell.from_face_pos_level(1, 0_u64, 0), Cell.from_face_pos_level(2, 0_u64, 0), Cell.from_face_pos_level(3, 0_u64, 0), Cell.from_face_pos_level(4, 0_u64, 0), Cell.from_face_pos_level(5, 0_u64, 0)}

INVERT_MASK = 2

LINEAR_PROJECTION = 0

LOOKUP_BITS = 4_u64

LOOKUP_IJ = Array.new((1_u64 << ((2 * LOOKUP_BITS) + 2)), 0_u64)

LOOKUP_POS = Array.new((1_u64 << ((2 * LOOKUP_BITS) + 2)), 0_u64)

MAX_ANGLE_SPAN = LengthMetric.new(1.704897179199218452)

MAX_AREA = AreaMetric.new(2.635799256963161491)

MAX_DIAG = LengthMetric.new(2.438654594434021032)

MAX_EDGE = LengthMetric.new(MAX_ANGLE_SPAN.deriv)

MAX_WIDTH = LengthMetric.new(MAX_ANGLE_SPAN.deriv)

MIN_ANGLE_SPAN = LengthMetric.new(4.0 / 3.0)

MIN_AREA = AreaMetric.new((8 * (Math.sqrt(2.0))) / 9.0)

MIN_DIAG = LengthMetric.new((8 * (Math.sqrt(2.0))) / 9.0)

MIN_EDGE = LengthMetric.new((2 * (Math.sqrt(2.0))) / 3.0)

MIN_WIDTH = LengthMetric.new((2 * (Math.sqrt(2.0))) / 3.0)

POS_TO_IJ = { {0_u64, 1_u64, 3_u64, 2_u64}, {0_u64, 2_u64, 3_u64, 1_u64}, {3_u64, 2_u64, 0_u64, 1_u64}, {3_u64, 1_u64, 0_u64, 2_u64} }

POS_TO_ORIENTATION = {SWAP_MASK, 0, 0, INVERT_MASK | SWAP_MASK}

QUADRATIC_PROJECTION = 2

SWAP_MASK = 1

TAN_PROJECTION = 1

at(lat : Float64, lng : Float64) : CellId

at(point : LatLng) : CellId

face_uv_to_xyz(face : Int32, u : Float64, v : Float64)

face_xyz_to_uv(face : Int32, p : Point)

in(p1 : LatLng, p2 : LatLng) : Array(CellId)

is_unit_length(p : Point) : Bool

valid_face_xyz_to_uv(face : Int32, p : Point)

xyz_to_face_uv(p : Point) : Tuple(Int32, Float64, Float64)