# CesiumWidget

#### new Cesium.CesiumWidget(container, options)
engine/Source/Widget/CesiumWidget.js 206

A widget containing a Cesium scene.

Name | Type | Description
--- | --- | ---
`container` | Element | string | The DOM element or ID that will contain the widget.
`options` | object | optional Object with the following properties:
Name | Type | Default | Description
--- | --- | --- | ---
`clock` | Clock | `new Clock()` | optional The clock to use to control current time.
`shouldAnimate` | boolean | `false` | optional `true` if the clock should attempt to advance simulation time by default, `false` otherwise.
`ellipsoid` | Ellipsoid | `Ellipsoid.default` | optional The default ellipsoid.
`baseLayer` | ImageryLayer | false | `ImageryLayer.fromWorldImagery()` | optional The bottommost imagery layer applied to the globe. If set to `false`, no imagery provider will be added.
`terrainProvider` | TerrainProvider | `new EllipsoidTerrainProvider(options.ellipsoid)` | optional The terrain provider.
`terrain` | Terrain |  | optional A terrain object which handles asynchronous terrain provider. Can only specify if options.terrainProvider is undefined.
`skyBox` | SkyBox | false |  | optional The skybox used to render the stars. When `undefined` and the WGS84 ellipsoid used, the default stars are used. If set to `false`, no skyBox, Sun, or Moon will be added.
`skyAtmosphere` | SkyAtmosphere | false |  | optional Blue sky, and the glow around the Earth's limb. Enabled when the default ellipsoid used. Set to `false` to turn it off.
`sceneMode` | SceneMode | `SceneMode.SCENE3D` | optional The initial scene mode.
`scene3DOnly` | boolean | `false` | optional When `true`, each geometry instance will only be rendered in 3D to save GPU memory.
`orderIndependentTranslucency` | boolean | `true` | optional If true and the configuration supports it, use order independent translucency.
`mapProjection` | MapProjection | `new GeographicProjection(options.ellipsoid)` | optional The map projection to use in 2D and Columbus View modes.
`globe` | Globe | false | `new Globe(options.ellipsoid)` | optional The globe to use in the scene. If set to `false`, no globe will be added and the sky atmosphere will be hidden by default.
`useDefaultRenderLoop` | boolean | `true` | optional True if this widget should control the render loop, false otherwise.
`useBrowserRecommendedResolution` | boolean | `true` | optional If true, render at the browser's recommended resolution and ignore `window.devicePixelRatio`.
`targetFrameRate` | number |  | optional The target frame rate when using the default render loop.
`showRenderLoopErrors` | boolean | `true` | optional If true, this widget will automatically display an HTML panel to the user containing the error, if a render loop error occurs.
`automaticallyTrackDataSourceClocks` | boolean | `true` | optional If true, this widget will automatically track the clock settings of newly added DataSources, updating if the DataSource's clock changes. Set this to false if you want to configure the clock independently.
`contextOptions` | ContextOptions |  | optional Context and WebGL creation properties passed to `Scene`.
`creditContainer` | Element | string |  | optional The DOM element or ID that will contain the `CreditDisplay`. If not specified, the credits are added to the bottom of the widget itself.
`creditViewport` | Element | string |  | optional The DOM element or ID that will contain the credit pop up created by the `CreditDisplay`. If not specified, it will appear over the widget itself.
`dataSources` | DataSourceCollection | `new DataSourceCollection()` | optional The collection of data sources visualized by the widget. If this parameter is provided, the instance is assumed to be owned by the caller and will not be destroyed when the widget is destroyed.
`shadows` | boolean | `false` | optional Determines if shadows are cast by light sources.
`terrainShadows` | ShadowMode | `ShadowMode.RECEIVE_ONLY` | optional Determines if the terrain casts or receives shadows from light sources.
`mapMode2D` | MapMode2D | `MapMode2D.INFINITE_SCROLL` | optional Determines if the 2D map is rotatable or can be scrolled infinitely in the horizontal direction.
`blurActiveElementOnCanvasFocus` | boolean | `true` | optional If true, the active element will blur when the widget's canvas is clicked. Setting this to false is useful for cases when the canvas is clicked only for retrieving position or an entity data without actually meaning to set the canvas to be the active element.
`requestRenderMode` | boolean | `false` | optional If true, rendering a frame will only occur when needed as determined by changes within the scene. Enabling improves performance of the application, but requires using `Scene#requestRender` to render a new frame explicitly in this mode. This will be necessary in many cases after making changes to the scene in other parts of the API. See Improving Performance with Explicit Rendering.
`maximumRenderTimeChange` | number | `0.0` | optional If requestRenderMode is true, this value defines the maximum change in simulation time allowed before a render is requested. See Improving Performance with Explicit Rendering.
`msaaSamples` | number | `4` | optional If provided, this value controls the rate of multisample antialiasing. Typical multisampling rates are 2, 4, and sometimes 8 samples per pixel. Higher sampling rates of MSAA may impact performance in exchange for improved visual quality. This value only applies to WebGL2 contexts that support multisample render targets. Set to 1 to disable MSAA.

##### Throws:

- DeveloperError : Element with id "container" does not exist in the document.

##### Example:

    // For each example, include a link to CesiumWidget.css stylesheet in HTML head,
    // and in the body, include: <div id="cesiumContainer"></div>

    // Widget with no terrain and default Bing Maps imagery provider.
    const widget = new Cesium.CesiumWidget("cesiumContainer");

    // Widget with ion imagery and Cesium World Terrain.
    const widget2 = new Cesium.CesiumWidget("cesiumContainer", {
        baseLayer: Cesium.ImageryLayer.fromWorldTerrain(),
        terrain: Cesium.Terrain.fromWorldTerrain()
        skyBox: new Cesium.SkyBox({
          sources: {
            positiveX: "stars/TychoSkymapII.t3_08192x04096_80_px.jpg",
            negativeX: "stars/TychoSkymapII.t3_08192x04096_80_mx.jpg",
            positiveY: "stars/TychoSkymapII.t3_08192x04096_80_py.jpg",
            negativeY: "stars/TychoSkymapII.t3_08192x04096_80_my.jpg",
            positiveZ: "stars/TychoSkymapII.t3_08192x04096_80_pz.jpg",
            negativeZ: "stars/TychoSkymapII.t3_08192x04096_80_mz.jpg"
          }
        }),
        // Show Columbus View map with Web Mercator projection
        sceneMode: Cesium.SceneMode.COLUMBUS_VIEW,
        mapProjection: new Cesium.WebMercatorProjection()
    });

##### Demo:

- Cesium Sandcastle Cesium Widget Demo

### Members

#### allowDataSourcesToSuspendAnimation : boolean
engine/Source/Widget/CesiumWidget.js 811

Gets or sets whether or not data sources can temporarily pause animation in order to avoid showing an incomplete picture to the user. For example, if asynchronous primitives are being processed in the background, the clock will not advance until the geometry is ready.

#### readonly camera : Camera
engine/Source/Widget/CesiumWidget.js 650

Gets the camera.

#### readonly canvas : HTMLCanvasElement
engine/Source/Widget/CesiumWidget.js 521

Gets the canvas.

#### readonly clock : Clock
engine/Source/Widget/CesiumWidget.js 676

Gets the clock.

#### clockTrackedDataSource : DataSource
engine/Source/Widget/CesiumWidget.js 887

Gets or sets the data source to track with the widget's clock.

#### readonly container : Element
engine/Source/Widget/CesiumWidget.js 508

Gets the parent container.

#### readonly creditContainer : Element
engine/Source/Widget/CesiumWidget.js 534

Gets the credit container.

#### creditDisplay : CreditDisplay
engine/Source/Widget/CesiumWidget.js 600

Manages the list of credits to display on screen and in the lightbox.

#### readonly creditViewport : Element
engine/Source/Widget/CesiumWidget.js 547

Gets the credit viewport

#### readonly dataSourceDisplay : DataSourceDisplay
engine/Source/Widget/CesiumWidget.js 612

Gets the display used for `DataSource` visualization.

#### readonly dataSources : DataSourceCollection
engine/Source/Widget/CesiumWidget.js 637

Gets the set of `DataSource` instances to be visualized.

#### readonly ellipsoid : Ellipsoid
engine/Source/Widget/CesiumWidget.js 663

Gets the default ellipsoid for the scene.

#### readonly entities : EntityCollection
engine/Source/Widget/CesiumWidget.js 625

Gets the collection of entities not tied to a particular data source. This is a shortcut to `dataSourceDisplay.defaultDataSource.entities`.

#### readonly imageryLayers : ImageryLayerCollection
engine/Source/Widget/CesiumWidget.js 573

Gets the collection of image layers that will be rendered on the globe.

#### resolutionScale : number
engine/Source/Widget/CesiumWidget.js 760

Gets or sets a scaling factor for rendering resolution. Values less than 1.0 can improve performance on less powerful devices while values greater than 1.0 will render at a higher resolution and then scale down, resulting in improved visual fidelity. For example, if the widget is laid out at a size of 640x480, setting this value to 0.5 will cause the scene to be rendered at 320x240 and then scaled up while setting it to 2.0 will cause the scene to be rendered at 1280x960 and then scaled down.

Default Value: `1.0`

#### readonly scene : Scene
engine/Source/Widget/CesiumWidget.js 560

Gets the scene.

#### readonly screenSpaceEventHandler : ScreenSpaceEventHandler
engine/Source/Widget/CesiumWidget.js 689

Gets the screen space event handler.

#### targetFrameRate : number
engine/Source/Widget/CesiumWidget.js 704

Gets or sets the target frame rate of the widget when `useDefaultRenderLoop` is true. If undefined, the browser's requestAnimationFrame implementation determines the frame rate. If defined, this value must be greater than 0. A value higher than the underlying requestAnimationFrame implementation will have no effect.

#### terrainProvider : TerrainProvider
engine/Source/Widget/CesiumWidget.js 585

The terrain provider providing surface geometry for the globe.

#### trackedEntity : Entity|undefined
engine/Source/Widget/CesiumWidget.js 825

Gets or sets the Entity instance currently being tracked by the camera.

#### readonly trackedEntityChanged : Event
engine/Source/Widget/CesiumWidget.js 876

Gets the event that is raised when the tracked entity changes.

#### useBrowserRecommendedResolution : boolean
engine/Source/Widget/CesiumWidget.js 789

Boolean flag indicating if the browser's recommended resolution is used. If true, the browser's device pixel ratio is ignored and 1.0 is used instead, effectively rendering based on CSS pixels instead of device pixels. This can improve performance on less powerful devices that have high pixel density. When false, rendering will be in device pixels. `CesiumWidget#resolutionScale` will still take effect whether this flag is true or false.

Default Value: `true`

#### useDefaultRenderLoop : boolean
engine/Source/Widget/CesiumWidget.js 734

Gets or sets whether or not this widget should control the render loop. If true the widget will use requestAnimationFrame to perform rendering and resizing of the widget, as well as drive the simulation clock. If set to false, you must manually call the `resize`, `render` methods as part of a custom render loop. If an error occurs during rendering, `Scene`'s `renderError` event will be raised and this property will be set to false. It must be set back to true to continue rendering after the error.

### Methods

#### destroy()
engine/Source/Widget/CesiumWidget.js 1020

Destroys the widget. Should be called if permanently removing the widget from layout.

#### flyTo(target, options) → Promise.<boolean>
engine/Source/Widget/CesiumWidget.js 1277

Flies the camera to the provided entity, entities, or data source. If the data source is still in the process of loading or the visualization is otherwise still loading, this method waits for the data to be ready before performing the flight.

The offset is heading/pitch/range in the local east-north-up reference frame centered at the center of the bounding sphere. The heading and the pitch angles are defined in the local east-north-up reference frame. The heading is the angle from y axis and increasing towards the x axis. Pitch is the rotation from the xy-plane. Positive pitch angles are above the plane. Negative pitch angles are below the plane. The range is the distance from the center. If the range is zero, a range will be computed such that the whole bounding sphere is visible.

In 2D, there must be a top down view. The camera will be placed above the target looking down. The height above the target will be the range. The heading will be determined from the offset. If the heading cannot be determined from the offset, the heading will be north.

Name | Type | Description
--- | --- | ---
`target` | Entity | Array.<Entity> | EntityCollection | DataSource | ImageryLayer | Cesium3DTileset | TimeDynamicPointCloud | Promise.<(Entity|Array.<Entity>|EntityCollection|DataSource|ImageryLayer|Cesium3DTileset|TimeDynamicPointCloud|VoxelPrimitive)> | The entity, array of entities, entity collection, data source, Cesium3DTileset, point cloud, or imagery layer to view. You can also pass a promise that resolves to one of the previously mentioned types.
`options` | object | optional Object with the following properties:
Name | Type | Default | Description
--- | --- | --- | ---
`duration` | number | `3.0` | optional The duration of the flight in seconds.
`maximumHeight` | number |  | optional The maximum height at the peak of the flight.
`offset` | HeadingPitchRange |  | optional The offset from the target in the local east-north-up reference frame centered at the target.

##### Returns:

A Promise that resolves to true if the flight was successful or false if the target is not currently visualized in the scene or the flight was cancelled. //TODO: Cleanup entity mentions

#### isDestroyed() → boolean
engine/Source/Widget/CesiumWidget.js 1012

##### Returns:

true if the object has been destroyed, false otherwise.

#### render()
engine/Source/Widget/CesiumWidget.js 1074

Renders the scene. This function is called automatically unless `useDefaultRenderLoop` is set to false;

#### resize()
engine/Source/Widget/CesiumWidget.js 1052

Updates the canvas size, camera aspect ratio, and viewport size. This function is called automatically as needed unless `useDefaultRenderLoop` is set to false.

#### showErrorPanel(title, message, error)
engine/Source/Widget/CesiumWidget.js 910

Show an error panel to the user containing a title and a longer error message, which can be dismissed using an OK button. This panel is displayed automatically when a render loop error occurs, if showRenderLoopErrors was not false when the widget was constructed.

Name | Type | Description
--- | --- | ---
`title` | string | The title to be displayed on the error panel. This string is interpreted as text.
`message` | string | optional A helpful, user-facing message to display prior to the detailed error information. This string is interpreted as HTML.
`error` | string | optional The error to be displayed on the error panel. This string is formatted using `formatError` and then displayed as text.

#### zoomTo(target, offset) → Promise.<boolean>
engine/Source/Widget/CesiumWidget.js 1248

Asynchronously sets the camera to view the provided entity, entities, or data source. If the data source is still in the process of loading or the visualization is otherwise still loading, this method waits for the data to be ready before performing the zoom.

The offset is heading/pitch/range in the local east-north-up reference frame centered at the center of the bounding sphere. The heading and the pitch angles are defined in the local east-north-up reference frame. The heading is the angle from y axis and increasing towards the x axis. Pitch is the rotation from the xy-plane. Positive pitch angles are above the plane. Negative pitch angles are below the plane. The range is the distance from the center. If the range is zero, a range will be computed such that the whole bounding sphere is visible.

In 2D, there must be a top down view. The camera will be placed above the target looking down. The height above the target will be the range. The heading will be determined from the offset. If the heading cannot be determined from the offset, the heading will be north.

Name | Type | Description
--- | --- | ---
`target` | Entity | Array.<Entity> | EntityCollection | DataSource | ImageryLayer | Cesium3DTileset | TimeDynamicPointCloud | Promise.<(Entity|Array.<Entity>|EntityCollection|DataSource|ImageryLayer|Cesium3DTileset|TimeDynamicPointCloud|VoxelPrimitive)> | The entity, array of entities, entity collection, data source, Cesium3DTileset, point cloud, or imagery layer to view. You can also pass a promise that resolves to one of the previously mentioned types.
`offset` | HeadingPitchRange | optional The offset from the center of the entity in the local east-north-up reference frame.

##### Returns:

A Promise that resolves to true if the zoom was successful or false if the target is not currently visualized in the scene or the zoom was cancelled.

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