specs_time 0.6.1

time resource for specs
Documentation 
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use num_traits::{Float, FromPrimitive};
use timelib;

#[derive(Debug, Clone)]
pub struct Time<T> {
    frame: usize,
    delta: T,

    unscaled_fixed_delta: T,
    fixed_delta: T,
    scale: T,

    current: T,
    start_time: T,
    fps: T,
}

impl<T> Default for Time<T>
where
    T: Float + FromPrimitive,
{
    #[inline]
    fn default() -> Self {
        Self::new(
            0_usize,
            T::from_f64(0.016666666666666667).unwrap(),
            T::from_f64(0.016666666666666667).unwrap(),
            T::one(),
            T::zero(),
            T::zero(),
            T::from_usize(60).unwrap(),
        )
    }
}

impl<T> Time<T>
where
    T: Float,
{
    #[inline(always)]
    pub fn new(
        frame: usize,
        delta: T,
        fixed_delta: T,
        scale: T,
        current: T,
        start_time: T,
        fps: T,
    ) -> Self {
        Time {
            frame: frame,
            delta: delta,

            unscaled_fixed_delta: fixed_delta,
            fixed_delta: fixed_delta * scale,
            scale: scale,

            current: current,
            start_time: start_time,
            fps: fps,
        }
    }
}

impl<T> Time<T>
where
    T: Float + FromPrimitive,
{
    #[inline(always)]
    pub fn frame(&self) -> usize {
        self.frame
    }
    #[inline(always)]
    pub fn delta(&self) -> T {
        self.delta
    }
    #[inline(always)]
    pub fn current(&self) -> T {
        self.current - self.start_time
    }
    #[inline(always)]
    pub fn start_time(&self) -> T {
        self.start_time
    }
    #[inline]
    pub fn fps(&self) -> T {
        T::from_usize(self.frame).unwrap() / self.current()
    }

    #[inline]
    pub fn set_scale(&mut self, scale: T) -> &mut Self {
        self.scale = scale;
        self.fixed_delta = self.unscaled_fixed_delta * scale;
        self
    }
    #[inline(always)]
    pub fn scale(&self) -> T {
        self.scale
    }

    #[inline(always)]
    pub fn fixed_delta(&self) -> T {
        self.fixed_delta
    }
    #[inline]
    pub fn set_fixed_delta(&mut self, fixed_delta: T) -> &mut Self {
        self.unscaled_fixed_delta = fixed_delta;
        self.fixed_delta = self.unscaled_fixed_delta * self.scale;
        self
    }

    #[inline]
    fn internal_update(&mut self, current_time: T) -> &mut Self {
        if self.frame == 0 {
            self.start_time = current_time;
            self.current = current_time - self.delta;
        }

        let delta = current_time - self.current;

        self.frame += 1;
        self.current = current_time;
        self.delta = delta;
        self
    }

    #[inline]
    pub fn update(&mut self) -> &mut Self {
        self.internal_update(T::from_f64(timelib::precise_time_s()).unwrap())
    }
}