Struct ScalePoint 

pub struct ScalePoint<T> { /* private fields */ }

Point scale maps discrete domain values to continuous range positions.

Points are evenly distributed across the range, with the first and last points aligned to the range boundaries.

Implementations

impl<T> ScalePoint<T>

where T: PartialEq,

pub fn new( domain: impl IntoIterator<Item = T>, range: [f32; 2], ) -> ScalePoint<T>

Place domain evenly from range[0] to range[1]; a single value sits in the middle of the range.

Examples

let scale = ScalePoint::new([1, 2, 3], [0., 100.]);
assert_eq!(scale.tick(&1), Some(0.));
assert_eq!(scale.tick(&2), Some(50.));
assert_eq!(scale.tick(&3), Some(100.));

pub fn tick_at(&self, index: usize) -> Option<f32>

Returns the position of the domain value at index.

Equivalent to Scale::tick on domain[index] for a domain of unique values, without searching the domain. Charts whose domain is built one entry per datum use this to project a series in linear time.

Trait Implementations

impl<T> Clone for ScalePoint<T>

where T: Clone,

fn clone(&self) -> ScalePoint<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Scale<T> for ScalePoint<T>

where T: PartialEq,

fn tick(&self, value: &T) -> Option<f32>

Get the tick of the scale.

fn nearest_index(&self, tick: f32) -> usize

The index of the domain value whose position is nearest tick; 0 for an empty domain or a scale without discrete positions.