Struct ScaleOrdinal 

pub struct ScaleOrdinal { /* private fields */ }

Maps discrete domain values to discrete range values (typically colors). Equivalent to D3’s scaleOrdinal().

Implementations

impl ScaleOrdinal

pub fn new(domain: Vec<String>, range: Vec<String>) -> Self

Create a new ordinal scale with the given domain and range.

pub fn map(&self, value: &str) -> Option<&str>

Map a domain value to a range value. Uses index-based lookup: domain[i] -> range[i % range.len()] Returns None if the value is not in the domain or if the range is empty.

pub fn map_index(&self, index: usize) -> Option<&str>

Get the range value at index i (cycling if i >= range.len()). Returns None if the range is empty.

pub fn domain(&self) -> &[String]

Get the domain values.

pub fn range(&self) -> &[String]

Get the range values.