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use crate::easing::*;
pub struct Linear;
impl EasingFunction for Linear {
#[inline]
fn y(&self, x: f64) -> f64 { x }
}
pub struct Step;
impl EasingFunction for Step {
#[inline]
fn y(&self, x: f64) -> f64 { x.round() }
}
pub struct EaseInQuad;
impl EasingFunction for EaseInQuad {
#[inline]
fn y(&self, x: f64) -> f64 { x * x }
}
pub struct EaseOutQuad;
impl EasingFunction for EaseOutQuad {
#[inline]
fn y(&self, x: f64) -> f64 { x * (2.0 - x) }
}
pub struct EaseInOutQuad;
impl EasingFunction for EaseInOutQuad {
#[inline]
fn y(&self, x: f64) -> f64 {
if x < 0.5 { 2.0 * x * x } else { -1.0 + (4.0 - 2.0 * x) * x }
}
}
pub struct EaseInCubic;
impl EasingFunction for EaseInCubic {
#[inline]
fn y(&self, x: f64) -> f64 { x * x * x }
}
pub struct EaseOutCubic;
impl EasingFunction for EaseOutCubic {
#[inline]
fn y(&self, x: f64) -> f64 {
let x_minus_one = x - 1.0;
1.0 + x_minus_one * x_minus_one * x_minus_one
}
}
pub struct EaseInOutCubic;
impl EasingFunction for EaseInOutCubic {
#[inline]
fn y(&self, x: f64) -> f64 {
if x < 0.5 { 4.0 * x * x * x }
else {
let x_minus_one = x - 1.0;
x_minus_one * (2.0 * x - 2.0) * (2.0 * x - 2.0) + 1.0
}
}
}
pub struct EaseInQuart;
impl EasingFunction for EaseInQuart {
#[inline]
fn y(&self, x: f64) -> f64 { x * x * x * x }
}
pub struct EaseOutQuart;
impl EasingFunction for EaseOutQuart {
#[inline]
fn y(&self, x: f64) -> f64 {
let x_minus_one = x - 1.0;
1.0 - x_minus_one * x_minus_one * x_minus_one * x_minus_one
}
}
pub struct EaseInOutQuart;
impl EasingFunction for EaseInOutQuart {
#[inline]
fn y(&self, x: f64) -> f64 {
if x < 0.5 { 8.0 * x * x * x * x }
else {
let x_minus_one = x - 1.0;
1.0 - 8.0 * x_minus_one * x_minus_one * x_minus_one * x_minus_one
}
}
}
pub struct EaseInQuint;
impl EasingFunction for EaseInQuint {
#[inline]
fn y(&self, x: f64) -> f64 { x * x * x * x * x }
}
pub struct EaseOutQuint;
impl EasingFunction for EaseOutQuint {
#[inline]
fn y(&self, x: f64) -> f64 {
let x_minus_one = x - 1.0;
1.0 + x_minus_one * x_minus_one * x_minus_one * x_minus_one * x_minus_one
}
}
pub struct EaseInOutQuint;
impl EasingFunction for EaseInOutQuint {
#[inline]
fn y(&self, x: f64) -> f64 {
if x < 0.5 { 16.0 * x * x * x * x * x }
else {
let x_minus_one = x - 1.0;
1.0 + 16.0 * x_minus_one * x_minus_one * x_minus_one * x_minus_one * x_minus_one
}
}
}
pub struct EaseIn;
impl EasingFunction for EaseIn {
#[inline]
fn y(&self, x: f64) -> f64 {
((x - 1.0) * std::f64::consts::FRAC_PI_2).sin() + 1.0
}
}
pub struct EaseOut;
impl EasingFunction for EaseOut {
#[inline]
fn y(&self, x: f64) -> f64 {
(x * std::f64::consts::FRAC_PI_2).sin()
}
}
pub struct EaseInOut;
impl EasingFunction for EaseInOut {
#[inline]
fn y(&self, x: f64) -> f64 {
0.5 * (1.0 - (x * std::f64::consts::PI).cos())
}
}