Source: https://d3js.org/d3-ease

Skip to content

On this page

d3-ease ​

==============================================

Examples · Easing is a method of distorting time to control apparent motion in animation. It is most commonly used for slow-in, slow-out . By easing time, animated transitions are smoother and exhibit more plausible motion.

The easing types in this module implement the ease method 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 easeElastic , may return eased times slightly outside this range. A good easing type should return 0 if t = 0 and 1 if t = 1.

These easing types are largely based on work by Robert Penner .

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. For example, to apply easeCubic easing:

js

const te = d3.easeCubic(t);

To apply custom elastic easing, create your easing function before the animation starts:

js

const ease = d3.easeElastic.period(0.4);

Then during the animation, apply the easing function:

js

const te = ease(t);

See also transition.ease .

easeLinear ​

---

Source · Linear easing; the identity function; linear(t) returns t.

easePoly ​

---

Source · Alias for easePolyInOut .

easePolyIn ​

1234exponent

Polynomial easing; raises t to the specified exponent . If the exponent is not specified, it defaults to 3, equivalent to easeCubicIn .

easePolyOut ​

1234exponent

Reverse polynomial easing; equivalent to 1 - easePolyIn (1 - t). If the exponent is not specified, it defaults to 3, equivalent to easeCubicOut .

easePolyInOut ​

Symmetric polynomial easing; scales easePolyIn for t in 0–0.5 and easePolyOut for t in 0.5–1. If the exponent is not specified, it defaults to 3, equivalent to easeCubic .

easePoly.exponent(e) ​

Exponent:2.00

Returns a new polynomial easing with the specified exponent e. For example, to create equivalents of easeLinear , easeQuad , and easeCubic :

js

const linear = d3.easePoly.exponent(1);
const quad = d3.easePoly.exponent(2);
const cubic = d3.easePoly.exponent(3);

easeQuad ​

---

Source · Alias for easeQuadInOut .

easeQuadIn ​

Quadratic easing; equivalent to easePolyIn .exponent (2).

easeQuadOut ​

Reverse quadratic easing; equivalent to 1 - easeQuadIn (1 - t). Also equivalent to easePolyOut .exponent (2).

easeQuadInOut ​

Symmetric quadratic easing; scales easeQuadIn for t in 0–0.5 and easeQuadOut for t in 0.5–1. Also equivalent to easePoly .exponent (2).

easeCubic ​

---

Source · Alias for easeCubicInOut .

easeCubicIn ​

Cubic easing; equivalent to easePolyIn .exponent (3).

easeCubicOut ​

Reverse cubic easing; equivalent to 1 - easeCubicIn (1 - t). Also equivalent to easePolyOut .exponent (3).

easeCubicInOut ​

Symmetric cubic easing; scales easeCubicIn for t in 0–0.5 and easeCubicOut for t in 0.5–1. Also equivalent to easePoly .exponent (3).

easeSin ​

---

Source · Alias for easeSinInOut .

easeSinIn ​

Sinusoidal easing; returns sin(t).

easeSinOut ​

Reverse sinusoidal easing; equivalent to 1 - easeSinIn (1 - t).

easeSinInOut ​

Symmetric sinusoidal easing; scales easeSinIn for t in 0–0.5 and easeSinOut for t in 0.5–1.

easeExp ​

---

Source · Alias for easeExpInOut .

easeExpIn ​

Exponential easing; raises 2 to the exponent 10 × (t - 1).

easeExpOut ​

Reverse exponential easing; equivalent to 1 - easeExpIn (1 - t).

easeExpInOut ​

Symmetric exponential easing; scales easeExpIn for t in 0–0.5 and easeExpOut for t in 0.5–1.

easeCircle ​

---

Source · Alias for easeCircleInOut .

easeCircleIn ​

Circular easing.

easeCircleOut ​

Reverse circular easing; equivalent to 1 - easeCircleIn (1 - t).

easeCircleInOut ​

Symmetric circular easing; scales easeCircleIn for t in 0–0.5 and easeCircleOut for t in 0.5–1.

easeElastic ​

---

Source · Alias for easeElasticOut .

easeElasticIn ​

Elastic easing, like a rubber band. The amplitude and period of the oscillation are configurable; if not specified, they default to 1 and 0.3, respectively.

easeElasticOut ​

Reverse elastic easing; equivalent to 1 - elasticIn (1 - t).

easeElasticInOut ​

Symmetric elastic easing; scales elasticIn for t in 0–0.5 and elasticOut for t in 0.5–1.

easeElastic.amplitude(a) ​

Amplitude:1.00

Returns a new elastic easing with the specified amplitude a. The amplitude a must be greater than or equal to 1.

easeElastic.period(p) ​

Period:0.30

Returns a new elastic easing with the specified period p.

easeBack ​

---

Source · Alias for easeBackInOut .

easeBackIn ​

Anticipatory easing like a dancer bending her knees before jumping off the floor. The degree of overshoot is configurable; if not specified, it defaults to 1.70158.

easeBackOut ​

Reverse anticipatory easing; equivalent to 1 - easeBackIn (1 - t).

easeBackInOut ​

Symmetric anticipatory easing; scales easeBackIn for t in 0–0.5 and easeBackOut for t in 0.5–1.

easeBack.overshoot(s) ​

Overshoot:1.70

Returns a new back easing with the specified overshoot s.

easeBounce ​

---

Source · Alias for easeBounceOut .

easeBounceIn ​

Bounce easing, like a rubber ball.

easeBounceOut ​

Reverse bounce easing; equivalent to 1 - easeBounceIn (1 - t).

easeBounceInOut ​

Symmetric bounce easing; scales easeBounceIn for t in 0–0.5 and easeBounceOut for t in 0.5–1.