rosu-pp 4.0.1

Difficulty and performance calculation for osu!
Documentation 
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pub struct Catcher;

const AREA_CATCHER_SIZE: f32 = 106.75;

impl Catcher {
    pub const BASE_SPEED: f64 = 1.0;
    pub const ALLOWED_CATCH_RANGE: f32 = 0.8;

    pub fn calculate_catch_width(cs: f32) -> f32 {
        Self::calculate_catch_width_by_scale(Self::calculate_scale(cs))
    }

    fn calculate_catch_width_by_scale(scale: f32) -> f32 {
        AREA_CATCHER_SIZE * scale.abs() * Self::ALLOWED_CATCH_RANGE
    }

    fn calculate_scale(cs: f32) -> f32 {
        ((f64::from(1.0_f32) - f64::from(0.7_f32) * ((f64::from(cs) - 5.0) / 5.0)) as f32 / 2.0
            * 1.0)
            * 2.0
    }
}