Created
April 11, 2014 19:45
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setInterval, but with easing from one timer value to another
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| (function(root) { | |
| 'use strict'; | |
| // Mapping of returned interval handles to their current timeout handles | |
| var intervals = {}, | |
| easedIntervalCounter = 0; | |
| var isNumeric = function(candidate) { | |
| return (!isNaN(parseFloat(candidate)) && isFinite(candidate)); | |
| }, | |
| partial = function(callback) { | |
| var args = Array.prototype.slice.call(arguments, 1); | |
| return function() { | |
| callback.apply(this, args.concat(arguments)); | |
| }; | |
| }, | |
| // Current time through tween, start value of tween, change between beginning and end values, duration of tween | |
| easeLinear = function (time, beginning, change, duration) { | |
| return change * time / duration + beginning; | |
| }, | |
| setTimer = function(intervalInfo) { | |
| var timeElapsed = new Date().getTime() - intervalInfo.started; | |
| // If we're done easing, drop down to a simple setInterval | |
| if (timeElapsed > intervalInfo.easeDuration) { | |
| intervalInfo.completed = true; | |
| intervalInfo.timeoutHandle = setInterval.apply(root, [intervalInfo.callback, intervalInfo.endInterval].concat(intervalInfo.arguments)); | |
| } | |
| // Otherwise, keep tweening | |
| else { | |
| var nextTime = intervalInfo.easeFunction(timeElapsed, intervalInfo.startInterval, intervalInfo.endInterval - intervalInfo.startInterval, intervalInfo.easeDuration); | |
| // Update info and run the timer | |
| intervalInfo.timeoutHandle = setTimeout(partial(nextInterval, intervalInfo), nextTime); | |
| } | |
| }, | |
| nextInterval = function(intervalInfo) { | |
| // Schedule next timer | |
| setTimer(intervalInfo); | |
| // Mimic setTimeout's behavior with `window` as `this` and addtional arguments passed to the callback | |
| intervalInfo.callback.apply(root, intervalInfo.arguments); | |
| }; | |
| root.setEasedInterval = function(callback, options) { | |
| var handle = ++easedIntervalCounter, | |
| now = new Date().getTime(); | |
| intervals[handle] = { | |
| arguments: Array.prototype.slice.call(arguments, 2), | |
| callback: callback, | |
| easeDuration: options.easeDuration, | |
| easeFunction: options.easeFunction || easeLinear, | |
| started: now, | |
| startInterval: options.startInterval, | |
| endInterval: options.endInterval | |
| }; | |
| setTimer(intervals[handle]); | |
| return handle; | |
| }; | |
| root.clearEasedInterval = function(handle) { | |
| var intervalInfo = intervals[handle]; | |
| if (intervalInfo.completed) { | |
| clearInterval(intervals[handle].timeoutHandle); | |
| } | |
| else { | |
| clearTimeout(intervals[handle].timeoutHandle); | |
| } | |
| delete intervals[handle]; | |
| }; | |
| })(this); |
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It's a native script, meant to run as-is.