Enum Curve 

pub enum Curve {
    Linear,
    OutCubic,
    OutBack,
    InOutQuad,
    InOutCubic,
    Spring(Spring),
    Bezier {
        x1: f64,
        y1: f64,
        x2: f64,
        y2: f64,
    },
}

How a value travels from one end to the other.

Variants

Linear

OutCubic

Fast start, soft landing. The default because it reads as responsive without looking mechanical.

OutBack

Overshoots slightly and settles back — for things appearing.

InOutQuad

Slow at both ends. For things that move rather than appear.

InOutCubic

Slow at both ends, more so: a longer wind-up and a longer settle around a faster middle. The same journey Self::InOutQuad makes, read as weight rather than as travel — for something crossing a screen rather than moving between two slots, which is what the genie does.

Spring(Spring)

Bezier

Any curve at all, as the two control points of a cubic bezier from (0,0) to (1,1) – the same four numbers CSS calls cubic-bezier and every easing site on the internet hands out.

The named curves above are the ones worth having a name; this is so a feel nobody anticipated does not need a compositor release.

Fields

x1: f64

y1: f64

x2: f64

y2: f64

Implementations

impl Curve

pub fn at(self, t: f64) -> f64

The curve’s value for a normalised time in 0..=1.

May exceed 1 on the way — that is what overshoot is — so callers must not clamp the result, only the time.

pub fn all() -> [(&'static str, Self); 6]

Every curve, for tools that want to show them all.

This is the whole vocabulary Self::from_name knows, so it is also what a script may write — and what the shipped lua/*.lua is checked against by script::tests. Self::Bezier is deliberately not here: it has no name, it is four numbers.

pub fn from_name(name: &str) -> Option<Self>

Look a curve up by the name a script or a settings file would use.

pub fn name(self) -> &'static str

What to call this curve.

Trait Implementations

impl Clone for Curve

fn clone(&self) -> Curve

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Curve

impl Debug for Curve

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Curve

fn default() -> Curve

Returns the “default value” for a type.

impl PartialEq for Curve

fn eq(&self, other: &Curve) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Curve