stuymedova / easings

Easing functions for smooth motion in animation

Easings

Easing functions

• Back easings: backInOut(t), backIn(t), backOut(t)
• Bounce easings: bounceInOut(t), bounceIn(t), bounceOut(t)
• Circle easings: circleInOut(t), circleIn(t), circleOut(t)
• Elastic easings: elasticInOut(t), elasticIn(t), elasticOut(t)
• Exponential easings: expoInOut(t), expoIn(t), expoOut(t)
• Linear easings: linear(t)
• Sine easings: sineInOut(t), sineIn(t), sineOut(t)
• Quadratic easings: quadInOut(t), quadIn(t), quadOut(t)
• Quartic easings: quartInOut(t), quartIn(t), quartOut(t)
• Quintic easings: quintInOut(t), quintIn(t), quintOut(t)

Input: time t, typically in the range [0, 1]
Output: “eased” time tʹ, also typically in the range [0, 1]

Demo/Usage

import * as easings from 'https://deno.land/x/easings/mod.ts';

for (let t = 0; t <= 1; t += 0.05) {
  const eased = easings.cubicInOut(t);
  const str = repeat('*', eased * 20);
  console.log(str);
}

function repeat(str, num) {
  let result = '';
  num = Math.round(num);
  while (num--) {
    if(num >= 0) result += str;
    else num = 0
  }
  return result;
}

Output:

*
*
**
***
*****
*******
**********
*************
***************
*****************
******************
*******************
*******************
********************
********************
********************

More on easing

Easing Graphs / D3 / Observable*
Easing Animations / D3 / Observable*

*Note that D3 has a slightly different API