ArcGIS error "target_extent has zero for width or height"

trieunguyenaxon

I tried to set view point for ArcGIS map and encountered an error exception:

ArcGIS Runtime Error Occurred. Set a breakpoint on C++ exceptions to see the original callstack and context for this error:  Error Domain=com.esri.arcgis.runtime.error Code=2 "Invalid argument." UserInfo={NSLocalizedFailureReason=target_extent has zero for width or height., NSLocalizedDescription=Invalid argument., Additional Message=target_extent has zero for width or height.}

The code to set the view point is attached bellow, and I recognized that the error just happens with some AGSPoint.

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RobertAnderson3_1-1723635651740.png

Ting

Well, a possible workaround might look like this

let extent: AGSEnvelope
if min(polygon.extent.width, polygon.extent.height) == .zero {
    let length = max(polygon.extent.width, polygon.extent.height)
    extent = AGSEnvelope(center: polygon.extent.center, width: length, height: length)
} else {
    extent = polygon.extent
}
mapView.setViewpointGeometry(extent)

When the extent of the polygon/polyline has zero width or height, add a condition to adjust its extent to a square, so that it can be correctly converted to a valid viewpoint target extent.

 

If you don't mind losing the original tightly-bound behavior, simply create a square extent for all geometries, regardless of whether it has a zero dimension or not.

let length = max(polygon.extent.width, polygon.extent.height)
let extent = AGSEnvelope(center: polygon.extent.center, width: length, height: length)
mapView.setViewpointGeometry(extent)

 

Although this is just a temporary fix and doesn't work perfectly. Hopefully the bug will be addressed in the upcoming versions of Runtime. 🙂