eazing 0.0.1

The blazingly fast and mathematically optimized `easing functions` kit.
Documentation 
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//! # The Sine Curve.

use crate::easing::Curve;

// #[cfg(feature = "libm")]
use libm::{cosf, sinf};

use core::f32::consts::PI;

/// ### The [`InSine`] Easing Function.
///
/// #### examples.
///
/// ```rust
/// use eazing::Curve;
/// use eazing::trigonometric::sine::InSine;
///
/// let p = InSine.y(0.5);
///
/// assert_eq!(p, 0.29289323);
/// ```
#[derive(Debug)]
pub struct InSine;

impl Curve for InSine {
  #[inline]
  fn y(&self, p: f32) -> f32 {
    1.0 - cosf(p * PI * 0.5)
  }
}

#[test]
fn test_in_sine() {
  let p = InSine.y(0.5);

  assert_eq!(p, 0.29289323);
}

/// ### The [`OutSine`] Easing Function.
///
/// Also see [`Curve`].
///
/// #### examples.
///
/// ```rust
/// use eazing::Curve;
/// use eazing::trigonometric::sine::OutSine;
///
/// let p = OutSine.y(0.1264);
///
/// assert_eq!(p, 0.1972467);
/// ```
#[derive(Debug)]
pub struct OutSine;

impl Curve for OutSine {
  #[inline]
  fn y(&self, p: f32) -> f32 {
    sinf(p * PI * 0.5)
  }
}

#[test]
fn test_out_sine() {
  let p = OutSine.y(0.1264);

  assert_eq!(p, 0.1972467);
}

/// ### The [`InOutSine`] Easing Function.
///
/// #### examples.
///
/// ```rust
/// use eazing::Curve;
/// use eazing::trigonometric::sine::InOutSine;
///
/// let p = InOutSine.y(0.248608);
///
/// assert_eq!(p, 0.14490387);
/// ```
#[derive(Debug)]
pub struct InOutSine;

impl Curve for InOutSine {
  #[inline]
  fn y(&self, p: f32) -> f32 {
    0.5 * (1.0 - cosf(p * PI))
  }
}

#[test]
fn test_in_out_sine() {
  let p = InOutSine.y(0.248608);

  assert_eq!(p, 0.14490387);
}