Represents the viewpoint of the viewer's map.
The current extent of the viewer's map in its own {@link esri.SpatialReference}.
The heading of the current viewpoint.
The pitch of the viewpoint.
The 2- or 3- dimensional position of the viewpoint's center.
The scale of the current viewpoint.
The time that the viewpoint message originated.
The component that last updated the viewpoint.
Represents the viewpoint of the viewer's map.