Timex

Timex is a small timer module that uses requestAnimationFrame and performance.now() (or process.hrtime in Node) for high-accuracy timing when possible. The timer can be paused and resumed, and set to an arbitrary time.

Installation

Timex is available on npm:

npm install [--save] timex

You can then require it as normal:

var Timex = require("timex");
var timer = new Timex();

Timex is also available on Bower:

bower install [--save] timex

Note: You should only use the Bower version in the browser.

Timex also works with browser module bundlers like Browserify and webpack.

Usage

new Timex()

Creates a new timer.

Timex#start([startAt])

Starts the timer. startAt can optionally be passed to set the timer to a given time (in milliseconds) before starting.

Timex#pause()

Pauses the timer.

Timex#set(ms)

Sets the timer's current time (in milliseconds).

Timex#getRate()

Returns the timer's current rate. Defaults to 1.

Timex#setRate(rate)

Sets the timer's rate. The rate affects how the time is calculated, not how often the timer ticks. For example, setting rate to 0.5 makes the timer increment time twice as slowly, but the ticks will occur just as often as before.

Timex#register(function(time){})

Registers a callback that gets called each time the timer ticks. The callback receives the current time of the timer as its only argument.

Note that the time will be a float when high-precision times are available (e.g. when using performance.now).

Timex#unregister(function(time){})

Unregisters a previously registered callback. Uses === to compare the functions.

Timex#currentTime

The current time of the timer.

Timex#running

Whether or not the timer is currently ticking.

License

Timex is licensed under the MIT license.

The MIT License (MIT)

Copyright (c) 2015 Michelle Tilley

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.