pub fn linear(t: f64) -> f64 {
t
}
pub fn quad_in(t: f64) -> f64 {
t * t
}
pub fn quad_out(t: f64) -> f64 {
t * (2.0 - t)
}
pub fn quad_in_out(t: f64) -> f64 {
if t < 0.5 {
2.0 * t * t
} else {
-1.0 + (4.0 - 2.0 * t) * t
}
}
pub fn cubic_in(t: f64) -> f64 {
t * t * t
}
pub fn cubic_out(t: f64) -> f64 {
let t = t - 1.0;
t * t * t + 1.0
}
pub fn cubic_in_out(t: f64) -> f64 {
if t < 0.5 {
4.0 * t * t * t
} else {
let t = t - 1.0;
1.0 + 4.0 * t * t * t
}
}