Basic interpolation method written in rust

interpolate.rs

pub fn interpolate(start: u32, end: u32, elapsed: u64, duration: u64) -> u32 {
    // Calculate step
    let x0 = 0f32;
    let y0 = min(start, end) as f32;
    let x1 = duration as f32;
    let y1 = max(end, start) as f32;
    let x = min(elapsed, duration) as f32;
    let delta = (x  * ((y1 - y0)/(x1 - x0))) as u32;
    if start > end {
        return start - delta;
    } else {
        return start + delta;
    }
}