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Shadow Cast | ArcGIS Maps SDK for JavaScript 4.33

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import "@arcgis/map-components/components/arcgis-shadow-cast";

No specific import is needed for this component.

The Shadow Cast component displays the cumulative shadows of 3D features in a Scene. This type of analysis is helpful in urban development, where new projects have to satisfy certain shadow duration constraints.

The component calculates the cumulative shadows for a time range during a single day. The user can configure the time range and select a calendar date. This time range and calendar date are only used for the shadow analysis and are not connected to the lighting in the scene. To control the lighting in the scene, the Daylight component can be used. Changing the timezone in the component updates the visualization by interpreting the time range as being in that timezone. This behavior is different from the Daylight component, where selecting a timezone updates the environment lighting's date and time according to the camera position.

The component provides three visualization modes: threshold, duration, and discrete mode.

In the threshold mode, only the areas that receive shadows for more than a certain amount of time are displayed. In the image below, on May 1, 2021 the red areas receive shadow for more than 4 hours within the time interval of 10AM to 4PM.

Total shadow duration mode displays the duration of the cumulative shadow using opacity: areas that don't receive any shadow are fully transparent and areas that receive a maximum amount of shadow have a default opacity of 0.7. The values in between are interpolated. Hovering over the Scene will display a tooltip showing the amount of time that location is in shadow, rounded to 15-minute intervals. In this mode, the visualization can display shadow cast in a continuous way or in 1-hour intervals.

Discrete shadows is a third visualization mode which displays individual shadows at a given time interval. For example, setting the time range to 10AM-11AM and the visualization time interval to 30 minutes will display shadows for 10AM, 10:30AM and 11:00AM.

The defaults for the time range and visualization settings can be changed using the startTimeOfDay, endTimeOfDay, and visualizationType properties.

Known limitations

• Shadow Cast is only supported in a 3D Scene component.
• Terrain does not cast shadows and it is therefore not taken into account in this analysis.
• The component does not take into account the daylight savings. Use the timezone dropdown to adjust the offset from the Coordinated Universal Time (UTC) and account for the daylight saving time.
• The timezone is automatically detected by the component based on the camera location. In some situations, this might not be accurate. In case of an inaccurate timezone, users can set it manually using the timezone dropdown.

See also

• Sample - Shadow cast component

Property

autoDestroyDisabled: boolean

If true, the component will not be destroyed automatically when it is disconnected from the document. This is useful when you want to move the component to a different place on the page, or temporarily hide it. If this is set, make sure to call the destroy method when you are done to prevent memory leaks.

Attribute

auto-destroy-disabled

Default value

false

Property

date: Date | number | string

The calendar date used to calculate the shadow cast. This date excludes the time. If a date with a time is set, the time value will be set to midnight (00:00:00) of that date in local system time. If no date is set, then it defaults to the current date in local system time.

See also

• Date

Attribute

date

Property

The configuration used when the component's visualizationType is set to "discrete".

Read more

Property

The configuration used when the component's visualizationType is set to "duration".

Read more

Property

endTimeOfDay: number

Time (in milliseconds from midnight of the date) when the shadow cast computation should stop.

Read more

Attribute

end-time-of-day

Default value

16 * 3600 * 1000

Property

headingLevel: number

Indicates the heading level to use for the titles "Time range" and "Visualization".

Attribute

heading-level

Default value

4

Property

hideColorPicker: boolean

Attribute

hide-color-picker

Default value

false

Property

hideDatePicker: boolean

Attribute

hide-date-picker

Default value

false

Property

hideThresholdContext: boolean

Attribute

hide-threshold-context

Default value

false

Property

hideThresholdContextColor: boolean

Attribute

hide-threshold-context-color

Default value

false

Property

hideThresholdContextTimeInterval: boolean

Attribute

hide-threshold-context-time-interval

Default value

false

Property

hideThresholdContextToggle: boolean

Attribute

hide-threshold-context-toggle

Default value

false

Property

hideTimeRangeSlider: boolean

Attribute

hide-time-range-slider

Default value

false

Property

hideTimezone: boolean

Attribute

hide-timezone

Default value

false

Property

hideTooltip: boolean

Attribute

hide-tooltip

Default value

false

Property

hideVisualizationOptions: boolean

Attribute

hide-visualization-options

Default value

false

Property

icon: string

Icon which represents the component. Typically used when the component is controlled by another component (e.g. by the Expand component).

See also: Calcite Icons

Attribute

icon

Default value

"measure-building-height-shadow"

Property

label: string

The component's default label.

Attribute

label

Property

position: "bottom-leading" | "bottom-left" | "bottom-right" | "bottom-trailing" | "manual" | "top-leading" | "top-left" | "top-right" | "top-trailing"

Attribute

position

Default value

"bottom-left"

Property

By assigning the id attribute of the Map or Scene component to this property, you can position a child component anywhere in the DOM while still maintaining a connection to the Map or Scene.

See also

• Associate components with a Map or Scene component

Attribute

reference-element

Property

startTimeOfDay: number

Time (in milliseconds from midnight of the date) when the shadow cast computation should start.

Read more

Attribute

start-time-of-day

Default value

10 * 3600 * 1000

state: "disabled" | "ready"

The component's state. The values mean the following:

• disabled - component is being created
• ready - component is ready

Attribute

state

Default value

"disabled"

Property

The configuration used when the component's visualizationType is set to "threshold".

Read more

Property

utcOffset: number

The difference in hours between UTC time and the times displayed in the component.

Attribute

utc-offset

Property

visualizationType: "discrete" | "duration" | "threshold"

Type of visualization to use when showing the shadows. There are 3 types of visualization:

• threshold - only displays areas that receive shadows for a period longer than a given threshold value
• duration - displays all areas that receive shadows either in a continuous mode or in 1 hour time intervals
• discrete - displays individual shadows cast at a given time interval

Attribute

visualization-type

Default value

"threshold"

No slots to display.

Event

Emitted when the value of a property is changed. Use this to listen to changes to properties.

Events triggered on this element will be propagated to their outermost elements.

The event is composable and will propagate across the shadow DOM into the standard DOM.

The event's default behavior can be canceled, allowing for custom behavior to be implemented instead.

Event

Emitted when the component associated with a map or scene view is is ready to be interacted with.

Events triggered on this element will be propagated to their outermost elements.

The event is composable and will propagate across the shadow DOM into the standard DOM.

The event's default behavior can be canceled, allowing for custom behavior to be implemented instead.

componentOnReady(): Promise<void>

destroy(): Promise<void>

getDuration(point: __esri.Point): Promise<number>

start(): Promise<void>

stop(): Promise<void>

Method

componentOnReady(): Promise<void>

Create a promise that resolves once component is fully loaded.

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const arcgisShadowCast = document.querySelector("arcgis-shadow-cast");
document.body.append(arcgisShadowCast);
await arcgisShadowCast.componentOnReady();
console.log("arcgis-shadow-cast is ready to go!");

Returns

Promise<void>

Method

destroy(): Promise<void>

Permanently destroy the component.

Returns

Promise<void>

Method

getDuration(point: __esri.Point): Promise<number>

Returns the time (in milliseconds) spent in shadow for a certain point on the screen.

Read more

point

Returns

Promise<number>

Method

start(): Promise<void>

Starts the component. While running, it will automatically perform shadow accumulation.

Returns

Promise<void>

Method

stop(): Promise<void>

Stops the component.

Returns

Promise<void>

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