topic AGSMapView zoomToEnvelope does not zoom as expected in ArcGIS Runtime SDK for iOS Questions

AGSMapView zoomToEnvelope does not zoom as expected

JamesEyre — Wed, 17 Sep 2014 14:48:56 GMT

I am developing an app where I have a small map in a view. I have two points on the map, and I would like to zoom to those two features. I have tried the following, but the map does not zoom to the expected extent.

AGSGeometryEngine* engine = [AGSGeometryEngine defaultGeometryEngine];

AGSPoint* gpsPoint = (AGSPoint*)[engine projectGeometry:currentLocation

toSpatialReference:self.mapView.spatialReference];

NSArray* geometries = [NSArray arrayWithObjects:gpsPoint, point, nil];

AGSMutableMultipoint* multipoint = (AGSMutableMultipoint*)[engine unionGeometries:geometries];

AGSEnvelope* envelope = multipoint.envelope;

[self.mapView zoomToEnvelope: envelope animated:NO];

The two points (gpsPoint and point) make an envelope that is wide but not very high. The map in the view is pretty much a square. When I call the zoomToEnvelope, I get an extent which does not show my features. It is a small envelope somewhere between my features. I do not see the features on the map.

Is there a function which allows me to zoom to an envelope, that will automatically expand itself to an envelope which contains the whole envelope I desire to zoom to?

Cheers,

Jamie

Re: AGSMapView zoomToEnvelope does not zoom as expected

Anonymous User — Wed, 17 Sep 2014 16:50:33 GMT

Instead of creating a multipoint, adding points and then using the extent. Use the extent of the points to create a polygon, then just zoom to the polygon you created with the extent of both points.

Re: AGSMapView zoomToEnvelope does not zoom as expected

JamesEyre — Thu, 18 Sep 2014 13:35:36 GMT

I tried this, but I get the same effect. It still zooms to a small extent between the two points. I have verified that the polygon's minx,maxx,miny,maxy are set correctly in the debugger. Any other ideas?

Re: AGSMapView zoomToEnvelope does not zoom as expected

Anonymous User — Thu, 18 Sep 2014 19:19:01 GMT

Any chance you can share a very small project with the reproducible case? I would recommend to add it on the MapViewDemo sample app and send it my way apascual@esri.com

Re: AGSMapView zoomToEnvelope does not zoom as expected

JamesEyre — Tue, 23 Sep 2014 17:22:17 GMT

I figured out the problem. I set the autoPanMode on the locationDisplay to AGSLocationDisplayAutoPanModeDefault.

self.mapView.locationDisplay.autoPanMode = AGSLocationDisplayAutoPanModeDefault;

Thanks for the help.