Struct Flatten 

pub struct Flatten { /* private fields */ }

Flatten — one level, everything in it. The honest hierarchy of a small graph or a single-zoom overlay; also the migration floor, so a renderer can move onto the engine before it has a real LOD story.

Implementations

impl Flatten

pub fn new(n: usize) -> Self

Trait Implementations

impl Clone for Flatten

fn clone(&self) -> Flatten

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Flatten

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

Formats the value using the given formatter.

impl Default for Flatten

fn default() -> Flatten

Returns the “default value” for a type.

impl Hierarchy for Flatten

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