Struct Layout 

pub struct Layout { /* private fields */ }

Layout — positions produced by a layout algorithm that keeps running (force-directed, hierarchical, metro). Arithmetically identical to Identity; the difference is generation, which every engine-side cache keys on.

Implementations

impl Layout

pub fn new(pts: Vec<[f64; 2]>) -> Self

pub fn set(&mut self, pts: Vec<[f64; 2]>)

Replace the positions and bump the generation — the one mutation a running layout performs per iteration.

pub fn set_f32(&mut self, pts: &[(f32, f32)])

pub fn points(&self) -> &[[f64; 2]]

Trait Implementations

impl Clone for Layout

fn clone(&self) -> Layout

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Layout

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

Formats the value using the given formatter.

impl Default for Layout

fn default() -> Layout

Returns the “default value” for a type.

impl PositionSource for Layout

fn feature_count(&self) -> usize

How many features this source addresses. Ids are 0..feature_count().

fn position(&self, id: u32) -> WorldPos

The anchor of feature id in world space, z left at 0.0.

fn generation(&self) -> u64

A generation counter. Bump it whenever positions move, so caches (cull index, pick index, screen grids) know to rebuild. A static source returns a constant; a live force layout returns its iteration number.

fn kind(&self) -> &'static str

Short tag for state_json / diagnostics ("mercator", "layout", …).

fn bounds(&self, id: u32) -> WorldAabb

The world-space extent of feature id. Point features keep the default. A road, a building footprint or a cluster hull overrides it — that box is what the culler and the Hierarchy index.

fn positions(&self, ids: &[u32], out: &mut Vec<WorldPos>)

Batch projection — the hot path. Overriding it is how a columnar source (Arrow, a GPU-resident buffer) avoids a virtual call per feature.