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tween-functions

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tween-functions

Robert Penner's easing functions, slightly modified

  • 1.2.0
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  • npm
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decreased by-19.33%
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What is tween-functions?

The tween-functions npm package provides a collection of easing functions for use in animations. These functions help in creating smooth transitions between values over time, which is essential for animations in web development, game development, and other interactive applications.

What are tween-functions's main functionalities?

Linear Easing

Linear easing provides a constant rate of change from the start value to the end value. This is useful for simple, uniform animations.

const tweenFunctions = require('tween-functions');
const startValue = 0;
const endValue = 100;
const duration = 1000;
const currentTime = 500;
const value = tweenFunctions.linear(currentTime, startValue, endValue - startValue, duration);
console.log(value); // 50

Ease In Quad

Ease In Quad starts the animation slowly and then accelerates. This is useful for animations that need to start gently and then speed up.

const tweenFunctions = require('tween-functions');
const startValue = 0;
const endValue = 100;
const duration = 1000;
const currentTime = 500;
const value = tweenFunctions.easeInQuad(currentTime, startValue, endValue - startValue, duration);
console.log(value); // 25

Ease Out Bounce

Ease Out Bounce creates a bouncing effect at the end of the animation. This is useful for playful or attention-grabbing animations.

const tweenFunctions = require('tween-functions');
const startValue = 0;
const endValue = 100;
const duration = 1000;
const currentTime = 500;
const value = tweenFunctions.easeOutBounce(currentTime, startValue, endValue - startValue, duration);
console.log(value); // 75

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Package last updated on 21 Nov 2015

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