Function sample_catmull_rom

examples/interactive_spline.rs:146–170

(control_points: &[[f64; 2]], samples_per_segment: usize)

}

fn sample_catmull_rom(control_points: &[[f64; 2]], samples_per_segment: usize) -> Vec<[f64; 2]> {
    if control_points.len() < 2 {
        return control_points.to_vec();
    }

    let mut out = Vec::new();

    for i in 0..(control_points.len() - 1) {
        let p0 = control_points[i.saturating_sub(1)];
        let p1 = control_points[i];
        let p2 = control_points[i + 1];
        let p3 = control_points[(i + 2).min(control_points.len() - 1)];

        for s in 0..samples_per_segment {
            let t = s as f64 / samples_per_segment as f64;
            out.push(catmull_rom_point(p0, p1, p2, p3, t));
        }
    }

    if let Some(last) = control_points.last().copied() {
        out.push(last);
    }

    out
}

fn catmull_rom_point(p0: [f64; 2], p1: [f64; 2], p2: [f64; 2], p3: [f64; 2], t: f64) -> [f64; 2] {
    let t2 = t * t;