# Easing

Analog of the Easing module from React Native.

#### API#

step0()

static step0(n)

A stepping function, returns 1 for any positive value of n.

step1()

step1()

A stepping function, returns 1 if n is greater than or equal to 1.

linear()

static linear(t)

A linear function, f(t) = t. Position correlates to elapsed time one to one.

http://cubic-bezier.com/#0,0,1,1

ease()

static ease(t)

A basic inertial interaction, similar to an object slowly accelerating to speed.

http://cubic-bezier.com/#.42,0,1,1

A quadratic function, f(t) = t * t. Position equals the square of elapsed time.

cubic()

static cubic(t)

A cubic function, f(t) = t * t * t. Position equals the cube of elapsed time.

http://easings.net/#easeInCubic

poly()

static poly(n)

A power function. Position is equal to the Nth power of elapsed time.

sin()

static sin(t)

A sinusoidal function.

http://easings.net/#easeInSine

circle()

static circle(t)

A circular function.

http://easings.net/#easeInCirc

exp()

static exp(t)

An exponential function.

http://easings.net/#easeInExpo

elastic()

static elastic(bounciness)

A basic elastic interaction, similar to a spring oscillating back and forth.

Default bounciness is 1, which overshoots a little bit once. 0 bounciness doesn't overshoot at all, and bounciness of N > 1 will overshoot about N times.

http://easings.net/#easeInElastic

back()

static back(s)

Use with Animated.parallel() to create a basic effect where the object animates back slightly as the animation starts.

bounce()

static bounce(t)

Provides a basic bouncing effect.

http://easings.net/#easeInBounce

bezier()

static bezier(x1, y1, x2, y2)

Provides a cubic bezier curve, equivalent to CSS Transitions' transition-timing-function.

A useful tool to visualize cubic bezier curves can be found at http://cubic-bezier.com/

in()

static in(easing);

Runs an easing function forwards.

out()

static out(easing)

Runs an easing function backwards.

inOut()

static inOut(easing)

Makes any easing function symmetrical. The easing function will run forwards for half of the duration, then backwards for the rest of the duration.