use ::std::f32::consts::PI;

/// <https://easings.net/#easeInSine>
#[inline]
pub fn sine_in(t: f32) -> f32 {
	1.0 - (t * PI / 2.0).cos()
}

/// <https://easings.net/#easeOutSine>
#[inline]
pub fn sine_out(t: f32) -> f32 {
	(t * PI / 2.0).sin()
}

/// <https://easings.net/#easeInOutSine>
#[inline]
pub fn sine_in_out(t: f32) -> f32 {
	-((PI * t).cos() - 1.0) / 2.0
}