Heads-up, this was fixed here in case of use/interest: https://github.com/zonebuilders/zonebuilder-rust/pull/16/files as follows:

fn round(poly: &mut Polygon<f64>, precision: usize) {
    // hardcoded 2 d.p. todo: update
    let p = 10_usize.pow(precision.try_into().unwrap()) as f64;
    poly.map_coords_inplace(|&(x, y)| (f64::trunc(x * p) / p, f64::trunc(y * p) / p))
}

pub fn clockboard(
    centerpoint: Point<f64>,
    params: Params,
    boundary: Option<Polygon<f64>>,
) -> Vec<Polygon<f64>> {
    let mut polygons = Vec::new();
    for i in params.distances {
        println!("{}", i);
        let circle = makecircle(centerpoint, i, params.num_vertices);
        polygons.push(circle);
    }

    for polygon in &mut polygons {
        round(polygon, params.precision);
    }

    polygons
}

Works really well, we can now output geojsons with any number of d.p. set by the user (almost) 🎉

Use generic type for precision #59

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