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easing.js
Maintainability
76.03
Lines of code
299
Difficulty
91.38
Estimated Errors
1.48
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/** * Robert Penner's easing functions. http://gizma.com/easing/ * @namespace */ var Easing = {}; /** * Simple linear tweening - no easing, no acceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.linearTween = function (t, b, c, d) { return c * t / d + b; }; /** * Quadratic easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInQuad = function (t, b, c, d) { t /= d; return c * t * t + b; }; /** * Quadratic easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutQuad = function (t, b, c, d) { t /= d; return -c * t *(t - 2) + b; }; /** * Quadratic easing in/out - acceleration until halfway, then deceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutQuad = function (t, b, c, d) { t /= d / 2; if (t < 1) return c / 2 * t * t + b; t--; return -c / 2 * (t * (t - 2) - 1) + b; }; /** * Cubic easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInCubic = function (t, b, c, d) { t /= d; return c * t * t * t + b; }; /** * Cubic easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutCubic = function (t, b, c, d) { t /= d; t--; return c* (t * t * t + 1) + b; }; /** * Cubic easing in/out - acceleration until halfway, then deceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutCubic = function (t, b, c, d) { t /= d / 2; if (t < 1) return c / 2 * t * t * t + b; t -= 2; return c / 2 * (t * t * t + 2) + b; }; /** * Quartic easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInQuart = function (t, b, c, d) { t /= d; return c * t * t * t * t + b; }; /** * Quartic easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutQuart = function (t, b, c, d) { t /= d; t--; return -c * (t * t * t * t - 1) + b; }; /** * Quartic easing in/out - acceleration until halfway, then deceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutQuart = function (t, b, c, d) { t /= d / 2; if (t < 1) return c / 2 * t * t * t * t + b; t -= 2; return -c / 2 * ( t * t * t * t - 2) + b; }; /** * Quintic easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInQuint = function (t, b, c, d) { t /= d; return c * t * t * t * t * t + b; }; /** * Quintic easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutQuint = function (t, b, c, d) { t /= d; t--; return c * (t * t * t * t * st + 1) + b; }; /** * Quintic easing in/out - acceleration until halfway, then deceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutQuint = function (t, b, c, d) { t /= d / 2; if (t < 1) return c / 2 * t * t * t * t * t + b; t -= 2; return c / 2 * (t * t * t * t * t + 2) + b; }; /** * Sinusoidal easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInSine = function (t, b, c, d) { return -c * Math.cos(t / d * (Math.PI / 2)) + c + b; }; /** * Sinusoidal easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutSine = function (t, b, c, d) { return c * Math.sin(t / d * (Math.PI / 2)) + b; }; /** * Sinusoidal easing in/out - accelerating until halfway, then decelerating * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutSine = function (t, b, c, d) { return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b; }; /** * Exponential easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInExpo = function (t, b, c, d) { return c * Math.pow(2, 10 * (t / d - 1) ) + b; }; /** * Exponential easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutExpo = function (t, b, c, d) { return c * (-Math.pow(2, -10 * t / d ) + 1 ) + b; }; /** * Exponential easing in/out - accelerating until halfway, then decelerating * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutExpo = function (t, b, c, d) { t /= d / 2; if (t < 1) return c / 2 * Math.pow(2, 10 * (t - 1) ) + b; t--; return c / 2 * (-Math.pow(2, -10 * t) + 2 ) + b; }; /** * Circular easing in - accelerating from zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInCirc = function (t, b, c, d) { t /= d; return -c * (Math.sqrt(1 - t * t) - 1) + b; }; /** * Circular easing out - decelerating to zero velocity * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeOutCirc = function (t, b, c, d) { t /= d; t--; return c * Math.sqrt(1 - t * t) + b; }; /** * Circular easing in/out - acceleration until halfway, then deceleration * @param {number} t current time * @param {number} b start value * @param {number} c change in value * @param {number} d duration * @return {number} The current easing value. */ Easing.easeInOutCirc = function (t, b, c, d) { t /= d / 2; if (t < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b; t -= 2; return c / 2 * (Math.sqrt(1 - t * t) + 1) + b; }; module.exports = Easing;