javascript
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three.js
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							<!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>
		[page:EventDispatcher] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			
				[name] is similar to [page:OrbitControls]. However, it does not maintain a constant camera [page:Object3D.up up] vector.
				That means if the camera orbits over the “north” and “south” poles, it does not flip to stay "right side up".
			
		</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 { TrackballControls } from 'three/addons/controls/TrackballControls.js';
		</code>

		<h2>Examples</h2>

		<p>[example:misc_controls_trackball misc / controls / trackball ]</p>

		<h2>Constructor</h2>

		<h3>[name]( [param:Camera camera], [param:HTMLDOMElement domElement] )</h3>
		
			<p>
				[page:Camera camera]: The camera of the rendered scene.
			</p>
			<p>
				[page:HTMLDOMElement domElement]: The HTML element used for event listeners.
			</p>
			<p>
				Creates a new instance of [name].
			</p>
		

		<h2>Events</h2>

		<h3>change</h3>
		<p>
			Fires when the camera has been transformed by the controls.
		</p>

		<h3>start</h3>
		<p>
			Fires when an interaction (e.g. touch) was initiated.
		</p>

		<h3>end</h3>
		<p>
			Fires when an interaction has finished.
		</p>

		<h2>Properties</h2>

		<h3>[property:HTMLDOMElement domElement]</h3>
		<p>
			The HTMLDOMElement used to listen for mouse / touch events. This must be passed in the constructor; changing it here will
			not set up new event listeners.
		</p>

		<h3>[property:Number dynamicDampingFactor]</h3>
		<p>
			Defines the intensity of damping. Only considered if [page:.staticMoving staticMoving] is set to `false`. Default is `0.2`.
		</p>

		<h3>[property:Boolean enabled]</h3>
		<p>
			Whether or not the controls are enabled.
		</p>

		<h3>[property:Array keys]</h3>
	
			This array holds keycodes for controlling interactions.
			<ul>
				<li>When the first defined key is pressed, all mouse interactions (left, middle, right) performs orbiting.</li>
				<li>When the second defined key is pressed, all mouse interactions (left, middle, right) performs zooming.</li>
				<li>When the third defined key is pressed, all mouse interactions (left, middle, right) performs panning.</li>
			</ul>
			Default is *KeyA, KeyS, KeyD* which represents A, S, D.
	

		<h3>[property:Number maxDistance]</h3>
		<p>
			How far you can dolly out ( [page:PerspectiveCamera] only ). Default is `Infinity`.
		</p>

		<h3>[property:Number minDistance]</h3>
		<p>
			How far you can dolly in ( [page:PerspectiveCamera] only ). Default is *0*.
		</p>

		<h3>[property:Float maxZoom]</h3>
		<p>
			How far you can zoom out ( [page:OrthographicCamera] only ). Default is `Infinity`.
		</p>

		<h3>[property:Float minZoom]</h3>
		<p>
			How far you can zoom in ( [page:OrthographicCamera] only ). Default is *0*.
		</p>

		<h3>
			[property:Object mouseButtons]</h3>
		
			This object contains references to the mouse actions used by the controls.
			<ul>
				<li>.LEFT is assigned with `THREE.MOUSE.ROTATE`</li>
				<li>.MIDDLE is assigned with `THREE.MOUSE.ZOOM`</li>
				<li>.RIGHT is assigned with `THREE.MOUSE.PAN`</li>
			</ul>
		

		<h3>[property:Boolean noPan]</h3>
		<p>
			Whether or not panning is disabled. Default is `false`.
		</p>

		<h3>[property:Boolean noRotate]</h3>
		<p>
			Whether or not rotation is disabled. Default is `false`.
		</p>

		<h3>[property:Boolean noZoom]</h3>
		<p>
			Whether or not zooming is disabled. Default is `false`.
		</p>

		<h3>[property:Camera object]</h3>
		<p>
			The camera being controlled.
		</p>

		<h3>[property:Number panSpeed]</h3>
		<p>
			The pan speed. Default is `0.3`.
		</p>

		<h3>[property:Number rotateSpeed]</h3>
		<p>
			The rotation speed. Default is `1.0`.
		</p>

		<h3>[property:Object screen]</h3>
		
			Represents the properties of the screen. Automatically set when [page:.handleResize handleResize]() is called.
			<ul>
				<li>left: Represents the offset in pixels to the screen's left boundary.</li>
				<li>top: Represents the offset in pixels to the screen's top boundary.</li>
				<li>width: Represents the screen width in pixels.</li>
				<li>height: Represents the screen height in pixels.</li>
			</ul>
		

		<h3>[property:Boolean staticMoving]</h3>
		<p>
			Whether or not damping is disabled. Default is `false`.
		</p>

		<h3>[property:Vector3 target]</h3>
		<p>
			The focus point of the controls.
		</p>

		<h3>[property:Number zoomSpeed]</h3>
		<p>
			The zoom speed. Default is `1.2`.
		</p>

		<h2>Methods</h2>

		<h3>[method:undefined checkDistances] ()</h3>
		<p>
			Ensures the controls stay in the range [minDistance, maxDistance]. Called by [page:.update update]().
		</p>

		<h3>[method:undefined dispose] ()</h3>
		<p>
			Should be called if the controls is no longer required.
		</p>

		<h3>[method:undefined handleResize] ()</h3>
		<p>
			Should be called if the application window is resized.
		</p>

		<h3>[method:undefined panCamera] ()</h3>
		<p>
			Performs panning if necessary. Called by [page:.update update]().
		</p>

		<h3>[method:undefined reset] ()</h3>
		<p>
			Resets the controls to its initial state.
		</p>

		<h3>[method:undefined rotateCamera] ()</h3>
		<p>
			Rotates the camera if necessary. Called by [page:.update update]().
		</p>

		<h3>[method:undefined update] ()</h3>
		<p>
			Updates the controls. Usually called in the animation loop.
		</p>

		<h3>[method:undefined zoomCamera] ()</h3>
		<p>
			Performs zooming if necessary. Called by [page:.update update]().
		</p>

		<h2>Source</h2>

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