Struct Bands 

pub struct Bands { /* private fields */ }

Bands — THE shared hierarchy. A map zoom pyramid and a graph cluster-expansion tree are both a list of Bands; nothing in the engine distinguishes them.

Implementations

impl Bands

pub fn new(levels: Vec<Band>, kind: &'static str) -> Self

Trait Implementations

impl Clone for Bands

fn clone(&self) -> Bands

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Bands

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

Formats the value using the given formatter.

impl Default for Bands

fn default() -> Bands

Returns the “default value” for a type.

impl Hierarchy for Bands

fn depth(&self) -> u32

Number of levels, >= 1.

fn level_for(&self, scale: f32) -> u32

Which level this camera scale wants. scale is world-units-per-pixel’s reciprocal — the same number Facet::scale_range() clamps, so a map band and a graph band are literally the same control.

fn members(&self, level: u32) -> &[u32]

Every feature present at level, ascending. For a map this is “the tiles / features of this zoom band”; for a graph, “the visible nodes with the currently-expanded clusters substituted in”.

fn expand(&self, level: u32, parent: u32) -> &[u32]

The children that replace parent when you descend from level to level + 1. Empty = parent is a leaf and survives the descent.

fn parent_of(&self, level: u32, child: u32) -> Option<u32>

The inverse of expand: the coarse feature that stands in for child at level - 1. Drives “zoom out and my selection follows”.

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