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Viewpoint Class | ArcGIS Maps SDK for Qt

Defines the visible area of a GeoModel that is displayed in a GeoView on a user's screen. More...

In a MapView, the bounding extent of a geometry or the map's center point and scale can define the map view's two-dimensional Viewpoint.

In a SceneView, a Camera represents the observer's position and perspective within three dimensions and defines the scene view's three-dimensional Viewpoint. Each camera has the following properties:

• Geographic location on the surface (longitude and latitude).
• Altitude (height, in meters, above sea level).
• Heading (angle about the z axis the camera is rotated, in degrees)
• Pitch (angle the camera is rotated up or down, in degrees)
• Roll (angle the camera is rotated side-to-side, in degrees)

When you publish or save a map or scene, as a web map, web scene, mobile map package, or mobile scene package, you define its initial Viewpoint. When you load a map or scene into your app, you can access and change the value of this GeoModel::initialViewpoint. If you add the map or scene to a GeoView, any change you make to the GeoModel::initialViewpoint is ignored. To change the Viewpoint of a displayed map or scene, use view methods such as:

• GeoView::setViewpoint(const Esri::ArcGISRuntime::Viewpoint&) to instantly change the visible area with no animation.
• MapView::setViewpointAsync(const Esri::ArcGISRuntime::Viewpoint&, float, Esri::ArcGISRuntime::AnimationCurve) to animates the display of the map to a viewpoint using the provided animation curve.
• SceneView::setViewpointCamera(const Esri::ArcGISRuntime::Camera&) to instantly moving the perspective in 3D scenes.

To determine the current visible area, call GeoView::currentViewpoint(Esri::ArcGISRuntime::ViewpointType). Make sure that any user-initiated or programmatic navigation is complete before getting the current Viewpoint by calling GeoView::isNavigating.

Example:

Create a Viewpoint on a MapView based on an extent and zoom to the extent with animation:

constexpr double xMin = -12338668.348591767;
constexpr double yMin = 5546908.424239618;
constexpr double xMax = -12338247.594362013;
constexpr double yMax = 5547223.989911933;
constexpr int wkid = 102100;
Viewpoint vpSpring(Envelope(xMin, yMin, xMax, yMax, SpatialReference(wkid)));
constexpr float duration = 4.0f;
m_mapView->setViewpointAsync(vpSpring, duration, AnimationCurve::EaseInOutCubic);

Note: This class is not default constructible internally, but a default constructor is provided for convenience. If the default constructor is used, the object will be empty. Calling any method on an empty object is undefined behavior and any values returned should not be relied upon.

Relevant samples:

• Set initial map area: Display a map with a predefined initial extent.
• Change viewpoint: Set the map view to a new viewpoint.
• Feature layer (dictionary renderer): Convert features into graphics to show them with mil2525d symbols.
• Manage bookmarks: Access and create bookmarks on a map.
• Min-Max scale: Restrict zooming between specific scale ranges.

Default constructor.

Note: This is provided for convenience and produces an empty object.

See also isEmpty.

A constructor that creates a Viewpoint with a bounding extent.

The spatial reference will be that same as the extent.

• targetExtent - The geometry to use as the visible area.

A constructor that creates a Viewpoint with a bounding extent and Camera.

The spatial reference will be that same as the extent.

• targetExtent - The geometry to use as the visible area.
• camera - A Camera object that defines the observer for the scene.

A constructor that creates a Viewpoint with a bounding extent and rotation.

• targetExtent - The geometry to use as the visible area.
• rotation - The rotation angle in degrees between 0 and 360.

A constructor that creates a Viewpoint with center point and scale.

• center - The center of the visible area.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.

A constructor that creates a Viewpoint with a bounding extent, rotation, and Camera.

• targetExtent - The geometry to use as the visible area.
• rotation - The rotation angle in degrees between 0 and 360.
• camera - A Camera object that defines the observer for the scene.

A constructor that creates a Viewpoint with center point, scale, and Camera.

• center - The center of the visible area.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.
• camera - A Camera object that defines the observer for the scene.

A constructor that creates a Viewpoint with center point, scale, and rotation.

• center - The center of the visible area.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.
• rotation - The rotation angle in degrees between 0 and 360.

A constructor that creates a Viewpoint with latitude, longitude, and scale.

The spatial reference for the defined point is WGS84.

• latitude - The latitude coordinate for the viewpoint's center. Negative values are south of the equator.
• longitude - The longitude coordinate for the viewpoint's center. Negative values are west of the prime meridian.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.

A constructor that creates a Viewpoint with center point, scale, rotation, and Camera.

• center - The center of the visible area.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.
• rotation - The rotation angle in degrees between 0 and 360.
• camera - A Camera object that defines the observer for the scene.

A constructor that creates a Viewpoint using a map center expressed as latitude and longitude, map scale, and camera.

The spatial reference for the defined point is WGS84.

• latitude - The latitude coordinate for the viewpoint's center. Negative values are south of the equator.
• longitude - The longitude coordinate for the viewpoint's center. Negative values are west of the prime meridian.
• scale - The ratio between a distance on the map and the corresponding distance on the ground.
• camera - A Camera object that defines the observer for the scene.

Copy constructor from other Viewpoint.

Move constructor from other Viewpoint.

Destructor.

Returns the viewpoint's Camera.

Creates a Viewpoint from its JSON string representation.

Returns a Viewpoint created using the data in the json parameter.

See also JsonSerializable.

Returns true if this Viewpoint is empty.

Gets the viewpoint rotation angle in degrees between 0 and 360.

See also Viewpoint.

Returns the viewpoint target geometry, if the viewpointType is ViewpointType::BoundingGeometry.

See also Viewpoint and viewpointType.

Returns the viewpoint's target scale, if the viewpointType is ViewpointType::CenterAndScale.

See also Viewpoint.

Reimplements: JsonSerializable::toJson() const.

Returns the Viewpoint as its JSON string representation.

See also JsonSerializable.

Returns the viewpoint's type.

This will be defined by a geometry or a Point geometry and scale.

See also Viewpoint.

Inequality operator. Returns true if this object and other are not equal.

This function was introduced in Esri::ArcGISRuntime 200.2.

See also Viewpoint::operator==.

Move operator from other Viewpoint.

Assignment operator from other Viewpoint.

Tests and returns true if this object is equal to a second Viewpoint object.

• other - The other viewpoint object.

This function was introduced in Esri::ArcGISRuntime 200.1.

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