Enum Direction 

pub enum Direction {
    TopDown,
    LeftRight,
    BottomTop,
    RightLeft,
}

Flow direction of a layout, in mermaid vocabulary: TD / LR / BT / RL.

Directions are transposes of one canonical computation: the layered pass lays ranks along the flow axis and orders nodes along the cross axis, then maps (cross, flow) into screen (x, y). Node cards never rotate — a w x h card stays w x h in every direction.

This is a closed vocabulary by design (four flows exist), so the enum is deliberately exhaustive per ADR-0003 §3.

Variants

TopDown

Rank 0 at the top, flow downward (mermaid TD/TB). The default.

LeftRight

Rank 0 at the left, flow rightward (mermaid LR).

BottomTop

Rank 0 at the bottom, flow upward (mermaid BT).

RightLeft

Rank 0 at the right, flow leftward (mermaid RL).

Implementations

impl Direction

pub const fn is_vertical(self) -> bool

True when the flow axis is vertical (TD / BT).

pub const fn is_reversed(self) -> bool

True when rank 0 sits at the far end of its axis (BT / RL), i.e. the canonical picture is mirrored along the flow axis.

Trait Implementations

impl Clone for Direction

fn clone(&self) -> Direction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Direction

impl Debug for Direction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Direction

fn default() -> Direction

Returns the “default value” for a type.

impl Eq for Direction

impl Hash for Direction

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Direction

fn eq(&self, other: &Direction) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Direction