Struct HitMap 

pub struct HitMap<C: DragConfig = Config> { /* private fields */ }

Registry of selectable elements for one chart panel + point hit-testing.

Hosts feed pointer events here: hit_test returns the topmost registered element under the point (later registrations win — register background elements like the data area first, small foreground elements like titles last). The model owns this because hit-testing is pure bounds geometry; the renderer only supplies the MeasureText implementation.

Implementations

impl<C: DragConfig> HitMap<C>

pub fn for_state() -> Self

Create a map for an explicit state type; Cartesian callers keep new().

pub fn register( &mut self, el: impl Selectable<C> + Send + Sync + 'static, ) -> HitId

pub fn hit_test( &self, cfg: &C, measure: &dyn MeasureText, x: f32, y: f32, ) -> Option<HitId>

Topmost element containing (x, y) — entries are tested in reverse registration order.

pub fn get(&self, id: HitId) -> Option<&(dyn Selectable<C> + Send + Sync)>

pub fn selection_box( &self, id: HitId, cfg: &C, measure: &dyn MeasureText, ) -> Option<SelectionBox>

Selection highlight for a registered element — the registered element’s Selectable::selection_box policy.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

impl HitMap<Config>

pub fn new() -> Self

pub fn standard_chart() -> Self

The standard registration set for a single chart panel, back-to-front: data area → axes → tick-label bands → axis titles → legend → chart title → colourbar strip → colourbar axis → colourbar labels → colourbar title.

Colourbar chrome is last, so it wins over anything it overlaps. Its smaller parts follow the strip, allowing the ticks, labels, and title to be selected independently while the strip remains the resize target.

Trait Implementations

impl Default for HitMap<Config>

fn default() -> Self

Returns the “default value” for a type.