javascript
/
three.js
zrkadlo https://github.com/tazdij/three.js.git


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124
							<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8" />
		<base href="../../../" />
		<script src="page.js"></script>
		<link type="text/css" rel="stylesheet" href="page.css" />
	</head>
	<body>

		<h1>[name]</h1>

		<p class="desc">
			This class is an alternative to [page:Clock] with a different API design and behavior
			The goal is to avoid the conceptual flaws that became apparent in [page:Clock] over time.

			<ul>
				<li>[name] has an [page:.update]() method that updates its internal state. That makes it possible to call [page:.getDelta]() and [page:.getElapsed]() multiple times per simulation step without getting different values.</li>
				<li>The class uses the Page Visibility API to avoid large time delta values when the app is inactive (e.g. tab switched or browser hidden).</li>
				<li>It's possible to configure a fixed time delta and a time scale value (similar to Unity's Time interface).</li>
			</ul>
		</p>

		<h2>Import</h2>

		<p>
			[name] is an add-on, and must be imported explicitly.
			See [link:#manual/introduction/Installation Installation / Addons].
		</p>

		<code>
			import { Timer } from 'three/addons/misc/Timer.js';
		</code>

		<h2>Code Example</h2>

		<code>
		const timer = new Timer();

		function animate() {

			requestAnimationFrame( animate );
			
			timer.update();

			const delta = timer.getDelta();

			// do something with delta

			renderer.render( scene, camera );

		}
		</code>

		<h2>Examples</h2>

		<p>
			[example:webgl_morphtargets_sphere WebGL / morphtargets / sphere]
		</p>

		<h2>Constructor</h2>

		<h3>Timer()</h3>

		<h2>Methods</h2>

		<h3>[method:this disableFixedDelta]()</h3>
		<p>
			Disables the usage of a fixed delta time.
		</p>

		<h3>[method:this dispose]()</h3>
		<p>
			Can be used to free all internal resources. Usually called when the timer instance isn't required anymore.
		</p>

		<h3>[method:this enableFixedDelta]()</h3>
		<p>
			Enables the usage of a fixed delta time.
		</p>

		<h3>[method:Number getDelta]()</h3>
		<p>
			Returns the time delta in seconds.
		</p>

		<h3>[method:Number getElapsed]()</h3>
		<p>
			Returns the elapsed time in seconds.
		</p>

		<h3>[method:Number getFixedDelta]()</h3>
		<p>
			Returns the fixed time delta that has been previously configured via [page:.setFixedDelta]().
		</p>

		<h3>[method:this reset]()</h3>
		<p>
			Resets the time computation for the current simulation step.
		</p>

		<h3>[method:this setFixedDelta]( [param:Number delta] )</h3>
		<p>
			Defines a fixed time delta value which is used to update the timer per simulation step.
		</p>

		<h3>[method:this setTimescale]( [param:Number timescale] )</h3>
		<p>
			Sets a time scale that scales the time delta in [page:.update]().
		</p>

		<h3>[method:this update]()</h3>
		<p>
			Updates the internal state of the timer. This method should be called once per simulation step
			and before you perform queries against the timer (e.g. via [page:.getDelta]()).
		</p>

		<h2>Source</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/misc/Timer.js examples/jsm/misc/Timer.js]
		</p>
	</body>
</html>