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Ticker.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Ticker - Documentation</title>
<script src="scripts/prettify/prettify.js"></script>
<script src="scripts/prettify/lang-css.js"></script>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/prettify.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc.css">
</head>
<body>
<input type="checkbox" id="nav-trigger" class="nav-trigger" />
<label for="nav-trigger" class="navicon-button x">
<div class="navicon"></div>
</label>
<label for="nav-trigger" class="overlay"></label>
<nav>
<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="Component.html">Component</a><ul class='methods'><li data-type='method'><a href="Component.html#getType">getType</a></li><li data-type='method'><a href="Component.html#onCreate">onCreate</a></li></ul></li><li><a href="ComponentStore.html">ComponentStore</a><ul class='methods'><li data-type='method'><a href="ComponentStore.html#create">create</a></li><li data-type='method'><a href="ComponentStore.html#free">free</a></li><li data-type='method'><a href="ComponentStore.html#register">register</a></li><li data-type='method'><a href="ComponentStore.html#registerMany">registerMany</a></li></ul></li><li><a href="Engine.html">Engine</a><ul class='methods'><li data-type='method'><a href="Engine.html#addEntity">addEntity</a></li><li data-type='method'><a href="Engine.html#addSystem">addSystem</a></li><li data-type='method'><a href="Engine.html#clear">clear</a></li><li data-type='method'><a href="Engine.html#emit">emit</a></li><li data-type='method'><a href="Engine.html#getEntities">getEntities</a></li><li data-type='method'><a href="Engine.html#off">off</a></li><li data-type='method'><a href="Engine.html#on">on</a></li><li data-type='method'><a href="Engine.html#once">once</a></li><li data-type='method'><a href="Engine.html#removeEntity">removeEntity</a></li><li data-type='method'><a href="Engine.html#removeSystem">removeSystem</a></li><li data-type='method'><a href="Engine.html#startResponding">startResponding</a></li><li data-type='method'><a href="Engine.html#stopResponding">stopResponding</a></li><li data-type='method'><a href="Engine.html#update">update</a></li></ul></li><li><a href="Entity.html">Entity</a><ul class='methods'><li data-type='method'><a href="Entity.html#addComponent">addComponent</a></li><li data-type='method'><a href="Entity.html#onCreate">onCreate</a></li><li data-type='method'><a href="Entity.html#onRemove">onRemove</a></li><li data-type='method'><a href="Entity.html#onReuse">onReuse</a></li><li data-type='method'><a href="Entity.html#removeComponent">removeComponent</a></li></ul></li><li><a href="EntityStore.html">EntityStore</a><ul class='methods'><li data-type='method'><a href="EntityStore.html#create">create</a></li><li data-type='method'><a href="EntityStore.html#free">free</a></li><li data-type='method'><a href="EntityStore.html#register">register</a></li><li data-type='method'><a href="EntityStore.html#registerMany">registerMany</a></li></ul></li><li><a href="Entropy.html">Entropy</a><ul class='methods'><li data-type='method'><a href="Entropy.html#addEntity">addEntity</a></li><li data-type='method'><a href="Entropy.html#addSystem">addSystem</a></li><li data-type='method'><a href="Entropy.html#createComponent">createComponent</a></li><li data-type='method'><a href="Entropy.html#createEntity">createEntity</a></li><li data-type='method'><a href="Entropy.html#createQuery">createQuery</a></li><li data-type='method'><a href="Entropy.html#createSystem">createSystem</a></li><li data-type='method'><a href="Entropy.html#emit">emit</a></li><li data-type='method'><a href="Entropy.html#getEntities">getEntities</a></li><li data-type='method'><a href="Entropy.html#isRunning">isRunning</a></li><li data-type='method'><a href="Entropy.html#off">off</a></li><li data-type='method'><a href="Entropy.html#on">on</a></li><li data-type='method'><a href="Entropy.html#once">once</a></li><li data-type='method'><a href="Entropy.html#pause">pause</a></li><li data-type='method'><a href="Entropy.html#registerComponent">registerComponent</a></li><li data-type='method'><a href="Entropy.html#registerComponents">registerComponents</a></li><li data-type='method'><a href="Entropy.html#registerEntity">registerEntity</a></li><li data-type='method'><a href="Entropy.html#registerEntitys">registerEntitys</a></li><li data-type='method'><a href="Entropy.html#registerSystem">registerSystem</a></li><li data-type='method'><a href="Entropy.html#registerSystems">registerSystems</a></li><li data-type='method'><a href="Entropy.html#removeEntity">removeEntity</a></li><li data-type='method'><a href="Entropy.html#removeSystem">removeSystem</a></li><li data-type='method'><a href="Entropy.html#resume">resume</a></li><li data-type='method'><a href="Entropy.html#start">start</a></li><li data-type='method'><a href="Entropy.html#startResponding">startResponding</a></li><li data-type='method'><a href="Entropy.html#stop">stop</a></li><li data-type='method'><a href="Entropy.html#stopResponding">stopResponding</a></li></ul></li><li><a href="EventEmitter.html">EventEmitter</a><ul class='methods'><li data-type='method'><a href="EventEmitter.html#emit">emit</a></li><li data-type='method'><a href="EventEmitter.html#off">off</a></li><li data-type='method'><a href="EventEmitter.html#on">on</a></li><li data-type='method'><a href="EventEmitter.html#once">once</a></li><li data-type='method'><a href="EventEmitter.html#startResponding">startResponding</a></li><li data-type='method'><a href="EventEmitter.html#stopResponding">stopResponding</a></li></ul></li><li><a href="Query.html">Query</a><ul class='methods'><li data-type='method'><a href="Query.html#addToIndex">addToIndex</a></li><li data-type='method'><a href="Query.html#getEntities">getEntities</a></li><li data-type='method'><a href="Query.html#initialize">initialize</a></li><li data-type='method'><a href="Query.html#removeFromIndex">removeFromIndex</a></li><li data-type='method'><a href="Query.html#satisfiedBy">satisfiedBy</a></li><li data-type='method'><a href="Query.html#shouldUpdate">shouldUpdate</a></li><li data-type='method'><a href="Query.html#update">update</a></li></ul></li><li><a href="SystemStore.html">SystemStore</a><ul class='methods'><li data-type='method'><a href="SystemStore.html#create">create</a></li><li data-type='method'><a href="SystemStore.html#register">register</a></li><li data-type='method'><a href="SystemStore.html#registerMany">registerMany</a></li></ul></li><li><a href="Ticker.html">Ticker</a><ul class='methods'><li data-type='method'><a href="Ticker.html#getFPS">getFPS</a></li><li data-type='method'><a href="Ticker.html#getMaxAllowedFPS">getMaxAllowedFPS</a></li><li data-type='method'><a href="Ticker.html#getSimulationTimestep">getSimulationTimestep</a></li><li data-type='method'><a href="Ticker.html#isRunning">isRunning</a></li><li data-type='method'><a href="Ticker.html#resetFrameDelta">resetFrameDelta</a></li><li data-type='method'><a href="Ticker.html#setMaxAllowedFPS">setMaxAllowedFPS</a></li><li data-type='method'><a href="Ticker.html#setSimulationTimestep">setSimulationTimestep</a></li><li data-type='method'><a href="Ticker.html#start">start</a></li><li data-type='method'><a href="Ticker.html#stop">stop</a></li></ul></li></ul><h3>Events</h3><ul><li><a href="Engine.html#event:clear">clear</a></li></ul>
</nav>
<div id="main">
<h1 class="page-title">Ticker</h1>
<section>
<header>
<h2>
Ticker
</h2>
</header>
<article>
<div class="container-overview">
<h4 class="name" id="Ticker"><span class="type-signature"></span>new Ticker<span class="signature">()</span><span class="type-signature"></span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line99">line 99</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id="getFPS"><span class="type-signature"></span>getFPS<span class="signature">()</span><span class="type-signature"> → {Number}</span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line407">line 407</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Returns the exponential moving average of the frames per second.</p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<p>The exponential moving average of the frames per second.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="getMaxAllowedFPS"><span class="type-signature"></span>getMaxAllowedFPS<span class="signature">()</span><span class="type-signature"> → {Number}</span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line422">line 422</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Gets the maximum frame rate.</p>
<p>Other factors also limit the FPS; see <code>MainLoop.setSimulationTimestep</code>
for details.</p>
<p>See also <code>MainLoop.setMaxAllowedFPS()</code>.</p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<p>The maximum number of frames per second allowed.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="getSimulationTimestep"><span class="type-signature"></span>getSimulationTimestep<span class="signature">()</span><span class="type-signature"> → {Number}</span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line349">line 349</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Gets how many milliseconds should be simulated by every run of update().</p>
<p>See <code>MainLoop.setSimulationTimestep()</code> for details on this value.</p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<p>The number of milliseconds that should be simulated by every run of
<code>update</code>().</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="isRunning"><span class="type-signature"></span>isRunning<span class="signature">()</span><span class="type-signature"> → {Boolean}</span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line584">line 584</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Returns whether the main loop is currently running.</p>
<p>See also <code>MainLoop.start()</code> and <code>MainLoop.stop()</code>.</p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<p>Whether the main loop is currently running.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h4 class="name" id="resetFrameDelta"><span class="type-signature"></span>resetFrameDelta<span class="signature">()</span><span class="type-signature"> → {Number}</span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line479">line 479</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Reset the amount of time that has not yet been simulated to zero.</p>
<p>This introduces non-deterministic behavior if called after the
application has started running (unless it is being reset, in which case
it doesn't matter). However, this can be useful in cases where the
amount of time that has not yet been simulated has grown very large
(for example, when the application's tab gets put in the background and
the browser throttles the timers as a result). In applications with
lockstep the player would get dropped, but in other networked
applications it may be necessary to snap or ease the player/user to the
authoritative state and discard pending updates in the process. In
non-networked applications it may also be acceptable to simply resume
the application where it last left off and ignore the accumulated
unsimulated time.</p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<p>The cumulative amount of elapsed time in milliseconds that has not yet
been simulated, but is being discarded as a result of calling this
function.</p>
</div>
<dl class="param-type">
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="setMaxAllowedFPS"><span class="type-signature"></span>setMaxAllowedFPS<span class="signature">(fps<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line442">line 442</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Sets a maximum frame rate.</p>
<p>See also <code>MainLoop.getMaxAllowedFPS()</code>.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>fps</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
<code>Infinity</code>
</td>
<td class="description last"><p>The maximum number of frames per second to execute. If Infinity or not
passed, there will be no FPS cap (although other factors do limit the
FPS; see <code>MainLoop.setSimulationTimestep</code> for details). If zero, this
will stop the loop, and when the loop is next started, it will return
to the previous maximum frame rate. Passing negative values will stall
the loop until this function is called again with a positive value.</p></td>
</tr>
</tbody>
</table>
<h4 class="name" id="setSimulationTimestep"><span class="type-signature"></span>setSimulationTimestep<span class="signature">(timestep)</span><span class="type-signature"></span></h4>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="Ticker.js.html">Ticker.js</a>, <a href="Ticker.js.html#line395">line 395</a>
</li></ul></dd>
</dl>
<div class="description">
<p>Sets how many milliseconds should be simulated by every run of update().</p>
<p>The perceived frames per second (FPS) is effectively capped at the
multiplicative inverse of the simulation timestep. That is, if the
timestep is 1000 / 60 (which is the default), then the maximum perceived
FPS is effectively 60. Decreasing the timestep increases the maximum
perceived FPS at the cost of running <code>update</code>() more
times per frame at lower frame rates. Since running update() more times
takes more time to process, this can actually slow down the frame rate.
Additionally, if the amount of time it takes to run update() exceeds or
very nearly exceeds the timestep, the application will freeze and crash
in a spiral of death (unless it is rescued; see <code>MainLoop.setEnd()</code> for
an explanation of what can be done if a spiral of death is occurring).</p>
<p>The exception to this is that interpolating between updates for each
render can increase the perceived frame rate and reduce visual
stuttering. See <code>MainLoop.setDraw()</code> for an explanation of how to do
this.</p>
<p>If you are considering decreasing the simulation timestep in order to
raise the maximum perceived FPS, keep in mind that most monitors can't
display more than 60 FPS. Whether humans can tell the difference among
high frame rates depends on the application, but for reference, film is
usually displayed at 24 FPS, other videos at 30 FPS, most games are
acceptable above 30 FPS, and virtual reality might require 75 FPS to
feel natural. Some gaming monitors go up to 144 FPS. Setting the
timestep below 1000 / 144 is discouraged and below 1000 / 240 is
strongly discouraged. The default of 1000 / 60 is good in most cases.</p>
<p>The simulation timestep should typically only be changed at
deterministic times (e.g. before the main loop starts for the first
time, and not in response to user input or slow frame rates) to avoid
introducing non-deterministic behavior. The update timestep should be
the same for all players/users in multiplayer/multi-user applications.</p>
<p>See also <code>MainLoop.getSimulationTimestep()</code>.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>timestep</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>The number of milliseconds that should be simulated by every run of
<code>update</code>().</p></td>