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# d3-ease
-*Easing* is a method of distorting time to control apparent motion in animation. It is most commonly used for [slow-in, slow-out](https://en.wikipedia.org/wiki/12_basic_principles_of_animation#Slow_In_and_Slow_Out). By easing time, [animated transitions](https://github.com/d3/d3-transition) are smoother and exhibit more plausible motion.
+
-The easing types in this module implement the [ease method](#ease_ease), which takes a normalized time *t* and returns the corresponding “eased” time *tʹ*. Both the normalized time and the eased time are typically in the range [0,1], where 0 represents the start of the animation and 1 represents the end; some easing types, such as [elastic](#easeElastic), may return eased times slightly outside this range. A good easing type should return 0 if *t* = 0 and 1 if *t* = 1. See the [easing explorer](https://observablehq.com/@d3/easing) for a visual demonstration.
+_Easing_ is a method of distorting time to control apparent motion in animation. It is most commonly used for [slow-in, slow-out](https://en.wikipedia.org/wiki/Twelve_basic_principles_of_animation#Slow_in_and_slow_out). By easing time, [animated transitions](https://github.com/d3/d3-transition) are smoother and exhibit more plausible motion.
-These easing types are largely based on work by [Robert Penner](http://robertpenner.com/easing/).
+## Resources
-## Installing
-
-If you use npm, `npm install d3-ease`. You can also download the [latest release on GitHub](https://github.com/d3/d3-ease/releases/latest). For vanilla HTML in modern browsers, import d3-ease from Skypack:
-
-```html
-
-```
-
-For legacy environments, you can load d3-ease’s UMD bundle from an npm-based CDN such as jsDelivr; a `d3` global is exported:
-
-```html
-
-
-```
-
-[Try d3-ease in your browser.](https://observablehq.com/@d3/easing-animations)
-
-## API Reference
-
-# ease(t)
-
-Given the specified normalized time *t*, typically in the range [0,1], returns the “eased” time *tʹ*, also typically in [0,1]. 0 represents the start of the animation and 1 represents the end. A good implementation returns 0 if *t* = 0 and 1 if *t* = 1. See the [easing explorer](https://observablehq.com/@d3/easing) for a visual demonstration. For example, to apply [cubic](#easeCubic) easing:
-
-```js
-const te = d3.easeCubic(t);
-```
-
-Similarly, to apply custom [elastic](#easeElastic) easing:
-
-```js
-// Before the animation starts, create your easing function.
-const customElastic = d3.easeElastic.period(0.4);
-
-// During the animation, apply the easing function.
-const te = customElastic(t);
-```
-
-# d3.easeLinear(t) [<>](https://github.com/d3/d3-ease/blob/master/src/linear.js "Source")
-
-Linear easing; the identity function; *linear*(*t*) returns *t*.
-
-[
](https://observablehq.com/@d3/easing#linear)
-
-# d3.easePolyIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/poly.js#L3 "Source")
-
-Polynomial easing; raises *t* to the specified [exponent](#poly_exponent). If the exponent is not specified, it defaults to 3, equivalent to [cubicIn](#easeCubicIn).
-
-[
](https://observablehq.com/@d3/easing#polyIn)
-
-# d3.easePolyOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/poly.js#L15 "Source")
-
-Reverse polynomial easing; equivalent to 1 - [polyIn](#easePolyIn)(1 - *t*). If the [exponent](#poly_exponent) is not specified, it defaults to 3, equivalent to [cubicOut](#easeCubicOut).
-
-[
](https://observablehq.com/@d3/easing#polyOut)
-
-# d3.easePoly(t) [<>](https://github.com/d3/d3-ease/blob/master/src/poly.js "Source")
-
# d3.easePolyInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/poly.js#L27 "Source")
-
-Symmetric polynomial easing; scales [polyIn](#easePolyIn) for *t* in [0, 0.5] and [polyOut](#easePolyOut) for *t* in [0.5, 1]. If the [exponent](#poly_exponent) is not specified, it defaults to 3, equivalent to [cubic](#easeCubic).
-
-[
](https://observablehq.com/@d3/easing#polyInOut)
-
-# poly.exponent(e) [<>](https://github.com/d3/d3-ease/blob/master/src/poly.js#L1 "Source")
-
-Returns a new polynomial easing with the specified exponent *e*. For example, to create equivalents of [linear](#easeLinear), [quad](#easeQuad), and [cubic](#easeCubic):
-
-```js
-const linear = d3.easePoly.exponent(1);
-const quad = d3.easePoly.exponent(2);
-const cubic = d3.easePoly.exponent(3);
-```
-
-# d3.easeQuadIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/quad.js#L1 "Source")
-
-Quadratic easing; equivalent to [polyIn](#easePolyIn).[exponent](#poly_exponent)(2).
-
-[
](https://observablehq.com/@d3/easing#quadIn)
-
-# d3.easeQuadOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/quad.js#L5 "Source")
-
-Reverse quadratic easing; equivalent to 1 - [quadIn](#easeQuadIn)(1 - *t*). Also equivalent to [polyOut](#easePolyOut).[exponent](#poly_exponent)(2).
-
-[
](https://observablehq.com/@d3/easing#quadOut)
-
-# d3.easeQuad(t) [<>](https://github.com/d3/d3-ease/blob/master/src/quad.js "Source")
-
# d3.easeQuadInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/quad.js#L9 "Source")
-
-Symmetric quadratic easing; scales [quadIn](#easeQuadIn) for *t* in [0, 0.5] and [quadOut](#easeQuadOut) for *t* in [0.5, 1]. Also equivalent to [poly](#easePoly).[exponent](#poly_exponent)(2).
-
-[
](https://observablehq.com/@d3/easing#quadInOut)
-
-# d3.easeCubicIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/cubic.js#L1 "Source")
-
-Cubic easing; equivalent to [polyIn](#easePolyIn).[exponent](#poly_exponent)(3).
-
-[
](https://observablehq.com/@d3/easing#cubicIn)
-
-# d3.easeCubicOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/cubic.js#L5 "Source")
-
-Reverse cubic easing; equivalent to 1 - [cubicIn](#easeCubicIn)(1 - *t*). Also equivalent to [polyOut](#easePolyOut).[exponent](#poly_exponent)(3).
-
-[
](https://observablehq.com/@d3/easing#cubicOut)
-
-# d3.easeCubic(t) [<>](https://github.com/d3/d3-ease/blob/master/src/cubic.js "Source")
-
# d3.easeCubicInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/cubic.js#L9 "Source")
-
-Symmetric cubic easing; scales [cubicIn](#easeCubicIn) for *t* in [0, 0.5] and [cubicOut](#easeCubicOut) for *t* in [0.5, 1]. Also equivalent to [poly](#easePoly).[exponent](#poly_exponent)(3).
-
-[
](https://observablehq.com/@d3/easing#cubicInOut)
-
-# d3.easeSinIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/sin.js#L4 "Source")
-
-Sinusoidal easing; returns sin(*t*).
-
-[
](https://observablehq.com/@d3/easing#sinIn)
-
-# d3.easeSinOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/sin.js#L8 "Source")
-
-Reverse sinusoidal easing; equivalent to 1 - [sinIn](#easeSinIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#sinOut)
-
-# d3.easeSin(t) [<>](https://github.com/d3/d3-ease/blob/master/src/sin.js "Source")
-
# d3.easeSinInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/sin.js#L12 "Source")
-
-Symmetric sinusoidal easing; scales [sinIn](#easeSinIn) for *t* in [0, 0.5] and [sinOut](#easeSinOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#sinInOut)
-
-# d3.easeExpIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/exp.js#L1 "Source")
-
-Exponential easing; raises 2 to the exponent 10 \* (*t* - 1).
-
-[
](https://observablehq.com/@d3/easing#expIn)
-
-# d3.easeExpOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/exp.js#L5 "Source")
-
-Reverse exponential easing; equivalent to 1 - [expIn](#easeExpIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#expOut)
-
-# d3.easeExp(t) [<>](https://github.com/d3/d3-ease/blob/master/src/exp.js "Source")
-
# d3.easeExpInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/exp.js#L9 "Source")
-
-Symmetric exponential easing; scales [expIn](#easeExpIn) for *t* in [0, 0.5] and [expOut](#easeExpOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#expInOut)
-
-# d3.easeCircleIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/circle.js#L1 "Source")
-
-Circular easing.
-
-[
](https://observablehq.com/@d3/easing#circleIn)
-
-# d3.easeCircleOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/circle.js#L5 "Source")
-
-Reverse circular easing; equivalent to 1 - [circleIn](#easeCircleIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#circleOut)
-
-# d3.easeCircle(t) [<>](https://github.com/d3/d3-ease/blob/master/src/circle.js "Source")
-
# d3.easeCircleInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/circle.js#L9 "Source")
-
-Symmetric circular easing; scales [circleIn](#easeCircleIn) for *t* in [0, 0.5] and [circleOut](#easeCircleOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#circleInOut)
-
-# d3.easeElasticIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js#L5 "Source")
-
-Elastic easing, like a rubber band. The [amplitude](#elastic_amplitude) and [period](#elastic_period) of the oscillation are configurable; if not specified, they default to 1 and 0.3, respectively.
-
-[
](https://observablehq.com/@d3/easing#elasticIn)
-
-# d3.easeElastic(t) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js "Source")
-
# d3.easeElasticOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js#L18 "Source")
-
-Reverse elastic easing; equivalent to 1 - [elasticIn](#easeElasticIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#elasticOut)
-
-# d3.easeElasticInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js#L31 "Source")
-
-Symmetric elastic easing; scales [elasticIn](#easeElasticIn) for *t* in [0, 0.5] and [elasticOut](#easeElasticOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#elasticInOut)
-
-# elastic.amplitude(a) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js#L40 "Source")
-
-Returns a new elastic easing with the specified amplitude *a*.
-
-# elastic.period(p) [<>](https://github.com/d3/d3-ease/blob/master/src/elastic.js#L41 "Source")
-
-Returns a new elastic easing with the specified period *p*.
-
-# d3.easeBackIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/back.js#L3 "Source")
-
-[Anticipatory](https://en.wikipedia.org/wiki/12_basic_principles_of_animation#Anticipation) easing, like a dancer bending his knees before jumping off the floor. The degree of [overshoot](#back_overshoot) is configurable; if not specified, it defaults to 1.70158.
-
-[
](https://observablehq.com/@d3/easing#backIn)
-
-# d3.easeBackOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/back.js#L15 "Source")
-
-Reverse anticipatory easing; equivalent to 1 - [backIn](#easeBackIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#backOut)
-
-# d3.easeBack(t) [<>](https://github.com/d3/d3-ease/blob/master/src/back.js "Source")
-
# d3.easeBackInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/back.js#L27 "Source")
-
-Symmetric anticipatory easing; scales [backIn](#easeBackIn) for *t* in [0, 0.5] and [backOut](#easeBackOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#backInOut)
-
-# back.overshoot(s) [<>](https://github.com/d3/d3-ease/blob/master/src/back.js#L1 "Source")
-
-Returns a new back easing with the specified overshoot *s*.
-
-# d3.easeBounceIn(t) [<>](https://github.com/d3/d3-ease/blob/master/src/bounce.js#L12 "Source")
-
-Bounce easing, like a rubber ball.
-
-[
](https://observablehq.com/@d3/easing#bounceIn)
-
-# d3.easeBounce(t) [<>](https://github.com/d3/d3-ease/blob/master/src/bounce.js "Source")
-
# d3.easeBounceOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/bounce.js#L16 "Source")
-
-Reverse bounce easing; equivalent to 1 - [bounceIn](#easeBounceIn)(1 - *t*).
-
-[
](https://observablehq.com/@d3/easing#bounceOut)
-
-# d3.easeBounceInOut(t) [<>](https://github.com/d3/d3-ease/blob/master/src/bounce.js#L20 "Source")
-
-Symmetric bounce easing; scales [bounceIn](#easeBounceIn) for *t* in [0, 0.5] and [bounceOut](#easeBounceOut) for *t* in [0.5, 1].
-
-[
](https://observablehq.com/@d3/easing#bounceInOut)
+- [Documentation](https://d3js.org/d3-ease)
+- [Examples](https://observablehq.com/collection/@d3/d3-ease)
+- [Releases](https://github.com/d3/d3-ease/releases)
+- [Getting help](https://d3js.org/community)