Struct ParameterList 

pub struct ParameterList<T> {
    values: Vec<(ParameterPoint, T)>,
    param_spaces: Vec<[Parameter; 7]>,
    nodes: Vec<FlatNode>,
}

A list of biome parameter points with their associated values.

Uses an R-Tree for lookup matching vanilla’s Climate.ParameterList.

Fields

values: Vec<(ParameterPoint, T)>

The biome entries (parameter point, value pairs)

param_spaces: Vec<[Parameter; 7]>

Cached parameter spaces for each value (for distance computation in lastResult)

nodes: Vec<FlatNode>

Flat R-Tree nodes in BFS order. Root is at index 0.

Implementations

impl<T> ParameterList<T>

pub fn new(values: Vec<(ParameterPoint, T)>) -> Self

Create a new parameter list from values, building an R-Tree index.

Panics

Panics if values is empty.

pub fn values(&self) -> &[(ParameterPoint, T)]

Get the underlying values.

pub fn find_value(&self, target: &TargetPoint) -> &T

Find the best matching value for a target point (no caching).

Uses R-Tree search matching vanilla’s Climate.ParameterList.findValue().

Note: Vanilla warm-starts with lastResult via ThreadLocal, which can affect tie-breaking on equal-distance candidates. This version starts from i64::MAX (no warm-start). Use find_value_cached for the hot path to match vanilla’s tie-breaking behavior.

Panics

Panics if the R-Tree search fails to find any matching value.

pub fn find_value_cached( &self, target: &TargetPoint, cache: &mut Option<usize>, ) -> &T

Find the best matching value with lastResult caching.

Matches vanilla’s Climate.ParameterList.findValue() with ThreadLocal lastNode warm-starting. The cache stores the index of the last result, which is used as the initial candidate for the next search, improving both performance and tie-breaking behavior.

Panics

Panics if the R-Tree search fails to find any matching value.