Struct LogOffsetMapper 

pub struct LogOffsetMapper { /* private fields */ }

Logarithmic range mapping with offset for negative ranges.

Provides logarithmic mapping for ranges that include zero or negative values by offsetting the range to positive values, applying log mapping, then offsetting back.

Use this when you need true logarithmic behavior (geometric mean at midpoint) for ranges that can’t use LogMapper.

Panics

Panics if the range end is not greater than the range start.

Example

// Logarithmic feel for threshold parameter
let mapper = LogOffsetMapper::new(-60.0..=0.0);

// The geometric mean (in offset space) is at normalized 0.5
let mid = mapper.denormalize(0.5);
// mid ≈ -53 dB (closer to min due to log curve)

Implementations

impl LogOffsetMapper

pub fn new(range: RangeInclusive<f64>) -> Self

Create a new logarithmic offset mapper.

The offset is automatically calculated to ensure all values are positive: offset = abs(min) + 1.0.

Panics

Panics if max <= min.

Trait Implementations

impl Clone for LogOffsetMapper

fn clone(&self) -> LogOffsetMapper

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LogOffsetMapper

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

Formats the value using the given formatter.

impl RangeMapper for LogOffsetMapper

fn normalize(&self, plain: f64) -> f64

Convert a plain value to normalized (0.0-1.0).

fn denormalize(&self, normalized: f64) -> f64

Convert a normalized value (0.0-1.0) to plain.

fn range(&self) -> (f64, f64)

Get the plain value range as (min, max).

fn default_normalized(&self, plain_default: f64) -> f64

Get the default normalized value for a given plain default.