Method IdentifyGraphicsOverlayAsync

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IdentifyGraphicsOverlayAsync(GraphicsOverlay, Point, double, bool, long)

Identifies a limited number of graphics in all graphics overlays, at the given screen point.

Declaration
public virtual Task<IdentifyGraphicsOverlayResult?> IdentifyGraphicsOverlayAsync(GraphicsOverlay overlay, Point screenPoint, double tolerance, bool returnPopupsOnly = false, long maximumResults = 1)
Parameters
Type Name Description
GraphicsOverlay overlay
Point screenPoint

The screen coordinates to identify the graphics.
double tolerance

A radius in device-independent pixels (DIP) that specifies how precise the identify operation should be.
bool returnPopupsOnly

true includes only popups in the identify results. false includes both geoelements and popups in the identify results.
long maximumResults
Returns
Type Description
Task<IdentifyGraphicsOverlayResult>

A task that represents the asynchronous identify operation on all graphics overlays in the view The value of the TResult parameter contains a read-only collection of IdentifyGraphicsOverlayResult in top to bottom order.
Remarks

As locations from user gestures are not always accurate to the exact pixel, you can define a tolerance for the identify operation. The tolerance parameter sets the radius of a circle, centered at the specified coordinates, in device-independent pixels (DIP). If the tolerance value is 0, identify performs the test at the specified coordinates. If it is greater than 0, identify tests inside the circle. For touch displays a value of 22 is recommended to cover an average finger tap. The maximum allowed value is 100 DIPs.

The returnPopupsOnly parameter controls which properties are populated in the IdentifyGraphicsOverlayResult instance. If true, only Popups is populated. If false, both Graphics and Popups are populated, if the overlay has popups.

Results are returned in a top-to-bottom order.