Function sample

examples/transform.rs:30–37

(count: usize, mut f: impl FnMut(f64) -> [f64; 2])

}

fn sample(count: usize, mut f: impl FnMut(f64) -> [f64; 2]) -> Vec<[f64; 2]> {
    (0..count)
        .map(|i| {
            let t = i as f64 / (count.saturating_sub(1).max(1)) as f64;
            f(t)
        })
        .collect()
}

fn new() -> PlotWidget {
    let identity = Series::line_only(