AGSMapView zoomToEnvelope does not zoom as expected

JamesEyre

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

Anonymous User

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.