AreaMeasurement3DViewModel | API Reference | ArcGIS Maps SDK for JavaScript 4.33

Provides the logic for the AreaMeasurement3D widget and component.

See also

AreaMeasurement3D widget - Deprecated since 4.33. Use the Area Measurement 3D component instead.
Programming patterns: Widget viewModel pattern

Constructors

AreaMeasurement3DViewModel Constructor new AreaMeasurement3DViewModel(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

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Type	Summary	Class
AreaMeasurementAnalysis	The area measurement analysis object being created or modified by the view model.	AreaMeasurement3DViewModel
String	The name of the class.	Accessor
Object\|null\|undefined	The current measurement of the area.	AreaMeasurement3DViewModel
String	The view model's state.	AreaMeasurement3DViewModel
SystemOrAreaUnit	Unit system (imperial, metric) or specific unit used for displaying the area values.	AreaMeasurement3DViewModel
SystemOrAreaUnit []	List of available units and unit systems (imperial, metric) for displaying the area values.	AreaMeasurement3DViewModel
SceneView\|null\|undefined	The view from which the widget will operate.	AreaMeasurement3DViewModel

Property Details

analysis Property analysis AreaMeasurementAnalysisautocast Since: ArcGIS Maps SDK for JavaScript 4.23 AreaMeasurement3DViewModel since 4.7, analysis added at 4.23.

The area measurement analysis object being created or modified by the view model.

If no analysis is provided, the view model automatically creates its own analysis and adds it to the view. In this case, the analysis will also be automatically removed from the view when the view model is destroyed.

Example

// Construct an area measurement analysis object outside of the view model
const analysis = new AreaMeasurementAnalysis({
  geometry: {
    type: "polygon", // autocasts as new Polygon()
    rings: [
      [-73.9817, 40.7681],
      [-73.9582, 40.8005],
      [-73.9495, 40.7968],
      [-73.9730, 40.7644],
      [-73.9817, 40.7681]
    ]
  }
});

// Ensure that the analysis is added to the view
view.analyses.add(analysis);

// Frame the analysis in the view
view.goTo(analysis.extent);

// Pass the analysis object as a constructor parameter to modify it using the view model
const viewModel = new AreaMeasurement3DViewModel({
  analysis: analysis,
  view: view
});

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

measurement Property measurement Object |null |undefinedreadonly

The current measurement of the area.

Properties: mode String

Describes the mode in which the measurement is computed. In euclidean mode, the area and perimeter length are computed from a flat polygon with straight segments on the perimeter in the ECEF coordinate system. In geodesic mode, the area and perimeter length are computed from a geodesic polygon on the WGS84 ellipsoid.

Possible Values:"euclidean"|"geodesic"

area MeasurementValue

Area of the polygon.

perimeterLength MeasurementValue

Perimeter length of the polygon.

state Property state Stringreadonly

The view model's state.

Value	Description
disabled	not ready yet
ready	ready for measuring
measuring	currently measuring
measured	measuring has finished

Possible Values:"disabled" |"ready" |"measuring" |"measured"

Default Value:"disabled"

unit Property unit SystemOrAreaUnit

Unit system (imperial, metric) or specific unit used for displaying the area values. Possible values are listed in unitOptions.

unitOptions Property unitOptions SystemOrAreaUnit[]

List of available units and unit systems (imperial, metric) for displaying the area values. By default, the following units are included: metric, imperial, square-inches, square-feet, square-us-feet, square-yards, square-miles, square-meters, square-kilometers, acres, ares, hectares. Possible unit values can only be a subset of this list.

view Property view SceneView |null |undefined

The view from which the widget will operate.

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
	Clears the current measurement.	AreaMeasurement3DViewModel
Boolean	Returns true if a named group of handles exist.	Accessor
	Removes a group of handles owned by the object.	Accessor
	Starts a new measurement.	AreaMeasurement3DViewModel

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

clear Method clear() Since: ArcGIS Maps SDK for JavaScript 4.16 AreaMeasurement3DViewModel since 4.7, clear added at 4.16.

Clears the current measurement.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	Description
Boolean	Returns `true` if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

start Method start() Since: ArcGIS Maps SDK for JavaScript 4.16 AreaMeasurement3DViewModel since 4.7, start added at 4.16.

Starts a new measurement.

Example

const areaMeasurement3DViewModel = new AreaMeasurement3DViewModel({
  view: view,
  unit: "square-meters"
});

await areaMeasurement3DViewModel.start();

Type Definitions

MeasurementValue Type Definition MeasurementValue Object

Measurement value.

Properties: text String|null|undefined

Textual representation of the measured value.

state String

State of the measured value.

Value Description

available measured value is available

unavailable measured value is not available due an incomplete measurement

invalid measured value is not available due to an invalid measurement configuration (e.g. self-intersecting polygon)