Struct LayerStack 

pub struct LayerStack { /* private fields */ }

A z-ordered set of Layers — the composition seam for graphs-over-maps. Push layers in any order; LayerStack::ordered yields them back→front (ascending z), with insertion order breaking ties so the result is deterministic.

Implementations

impl LayerStack

pub fn new() -> Self

pub fn push(&mut self, layer: Layer) -> usize

Push a layer; returns its insertion index (its tie-break key).

pub fn add(&mut self, z: f32, kind: LayerKind) -> usize

Convenience: push kind at z.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn ordered(&self) -> Vec<Layer>

The layers in paint order — ascending z, insertion order breaking ties. Back→front: the renderer draws element 0 first (underneath), the last on top.

pub fn top(&self) -> Option<Layer>

The topmost layer (largest z; last-inserted wins a tie), or None if empty.

Trait Implementations

impl Clone for LayerStack

fn clone(&self) -> LayerStack

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayerStack

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

Formats the value using the given formatter.

impl Default for LayerStack

fn default() -> LayerStack

Returns the “default value” for a type.