pub struct Interval {
    pub min: f32,
    pub max: f32,
}

impl Interval {
    pub fn new(min: f32, max: f32) -> Self {
        Self { min, max }
    }

    pub fn size(&self) -> f32 {
        self.max - self.min
    }

    pub fn contains(&self, x: f32) -> bool {
        self.min <= x && x <= self.max
    }

    pub fn surrounds(&self, x: f32) -> bool {
        self.min < x && x < self.max
    }
}

impl Default for Interval {
    fn default() -> Self {
        Self {
            min: f32::NEG_INFINITY,
            max: f32::INFINITY
        }
    }
}

pub const INTERVAL_EMPTY: Interval = Interval {
    min: f32::INFINITY,
    max: f32::NEG_INFINITY
};

pub const INTERVAL_UNIVERSE: Interval = Interval {
    min: f32::NEG_INFINITY,
    max: f32::INFINITY
};