asciigraph 0.10.1

Ascii Graph
Documentation 
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use hmath::{Ratio, BigInt};

/// Ratio: <https://docs.rs/hmath/latest/hmath/struct.Ratio.html>
///
/// If you're too lazy to read the docs, just call `f64::try_from(n).unwrap()`.
///
/// It's default to `DefaultFormatter`.
pub trait NumberFormatter {
    fn f(&self, n: &Ratio) -> String;
}

pub struct DefaultFormatter;

impl NumberFormatter for DefaultFormatter {
    fn f(&self, n: &Ratio) -> String {
        if n.abs().lt_rat(&THOUSAND) {
            n.to_approx_string(8)
        }

        else {
            let bi = n.truncate_bi();

            if bi.abs().lt_bi(&BILLION) {
                bi.to_string()
            }

            else {
                bi.to_scientific_notation(4)
            }
        }
    }
}

lazy_static::lazy_static! {
    pub static ref THOUSAND: Ratio = Ratio::from_i32(1000);
    pub static ref BILLION: BigInt = BigInt::from_i32(1_000_000_000);
}