Function log_formatter

src/ticks.rs:59–70

A simple formatter for logarithmic ticks with an arbitrary base. Expects positive `tick.value` and renders labels as `b^n`, where `b` is the provided base.

(mark: Tick, base: f64)

    if log_step >= 0.0 {
        format!("{:.0}", mark.value)
    } else {
        let decimal_places = (-log_step).ceil() as usize;
        format!("{:.*}", decimal_places, mark.value)
    }
}

/// A simple formatter for logarithmic ticks with an arbitrary base.
///
/// Expects positive `tick.value` and renders labels as `b^n`, where `b` is the provided base.
pub fn log_formatter(mark: Tick, base: f64) -> String {
    if !mark.value.is_finite() || mark.value <= 0.0 {
        return String::new();
    }
    let exp = mark.value.log(base).round() as i32;