Provides the logic for the AreaMeasurement3D widget.
Constructors
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new AreaMeasurement3DViewModel(properties)
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Parameterproperties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
AreaMeasurementAnalysis | The area measurement analysis object being created or modified by the view model. more details | AreaMeasurement3DViewModel | |
String | The name of the class. more details | Accessor | |
Object | The current measurement of the area. more details | AreaMeasurement3DViewModel | |
String | The view model's state. more details | AreaMeasurement3DViewModel | |
SystemOrAreaUnit | Unit system (imperial, metric) or specific unit used for displaying the area values. more details | AreaMeasurement3DViewModel | |
SystemOrAreaUnit[] | List of available units and unit systems (imperial, metric) for displaying the area values. more details | AreaMeasurement3DViewModel | |
SceneView | The view from which the widget will operate. more details | AreaMeasurement3DViewModel |
Property Details
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Since: ArcGIS Maps SDK for JavaScript 4.23
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The area measurement analysis object being created or modified by the view model.
This property can be set during view model construction, to provide an existing analysis to the view model for modification. Properties on the analysis can also be updated once it's assigned to the view model.
If no analysis is provided during view model construction, 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 });
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The name of the class. The declared class name is formatted as
esri.folder.className
.
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measurement Objectreadonly
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The current measurement of the area.
- Properties
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mode String
Describes the mode in which the measurement was taken. 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. Ingeodesic
mode, the area and perimeter length are computed from a geodesic polygon on the WGS84 ellipsoid.Possible Values:"euclidean"|"geodesic"
area MeasurementValueThe area of the polygon.
perimeterLength MeasurementValueThe perimeter length of the polygon.
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state Stringreadonly
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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
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unit SystemOrAreaUnit
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Unit system (imperial, metric) or specific unit used for displaying the area values. Possible values are listed in unitOptions.
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unitOptions SystemOrAreaUnit[]
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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.
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view SceneView
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The view from which the widget will operate.
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. more details | Accessor | ||
Clears the current measurement. more details | AreaMeasurement3DViewModel | ||
Boolean | Returns true if a named group of handles exist. more details | Accessor | |
Removes a group of handles owned by the object. more details | Accessor | ||
Starts a new measurement. more details | AreaMeasurement3DViewModel |
Method Details
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addHandles(handleOrHandles, groupKey)inheritedSince: ArcGIS Maps SDK for JavaScript 4.25
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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();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey 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.
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clear()Since: ArcGIS Maps SDK for JavaScript 4.16
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Clears the current measurement.
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Since: ArcGIS Maps SDK for JavaScript 4.25
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Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType 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"); }
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removeHandles(groupKey)inheritedSince: ArcGIS Maps SDK for JavaScript 4.25
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Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
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start()Since: ArcGIS Maps SDK for JavaScript 4.16
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Starts a new measurement.
Exampleconst areaMeasurement3DViewModel = new AreaMeasurement3DViewModel({ view: view, unit: "square-meters" }); await areaMeasurement3DViewModel.start();
Type Definitions
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MeasurementValue Object
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Measurement value.
- Properties
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text String
Textual representation of the measured value.
state StringState 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)