use std::{thread, time};

fn beniz<'a>(max:f32, val:f32, len:i32) -> String {
    let mut b = String::new();
    let v = ((val / max) * len as f32) as i32;
    for x in -len..0 {
        b.push(if x > v {
            '='
        } else if x == v {
            'C'
        } else {
            ' '
        });
    }
    b.push('8');
    for x in 1..len {
        b.push(if x < v {
            '='
        } else if x == v {
            'D'
        } else {
            ' '
        });
    }
    b
}

fn benizy<F>(max:f32, f:F, step:f32, len: i32)
    where F: Fn(f32) -> f32 {
    let mut val = 0f32;
    loop {
        println!("{}", beniz(max, f(val), len));
        val += step;
        thread::sleep(time::Duration::from_millis(25));
    }
}

fn main() {
    benizy(1.0, |x| x.sin(), 0.1, 20);
}