Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
Developer Community or GitHub with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
On the UWP and Windows Phone 8.1 platforms, the VisibleRegion property of the Map is being calculated incorrectly and results in latitude and longitude spans that are half the correct values.
The error is in https://github.com/xamarin/Xamarin.Forms/blob/master/Xamarin.Forms.Maps.UWP/MapRenderer.cs, lines 217 and 218. The current code is:
var latitudeDelta = Math.Abs(center.Latitude - boundingBox.NorthwestCorner.Latitude);
var longitudeDelta = Math.Abs(center.Longitude - boundingBox.NorthwestCorner.Longitude);
The correct code is:
var latitudeDelta = Math.Abs(boundingBox.SoutheastCorner.Latitude - boundingBox.NorthwestCorner.Latitude);
var longitudeDelta = Math.Abs(boundingBox.SoutheastCorner.Longitude - boundingBox.NorthwestCorner.Longitude);
Alternatively, the current line 219
Element.VisibleRegion = new MapSpan(center, latitudeDelta, longitudeDelta);
can be changed to:
Element.VisibleRegion = new MapSpan(center, 2* latitudeDelta, 2 * longitudeDelta);
*** Bug 48375 has been marked as a duplicate of this bug. ***
So, confirmed and with a given fix for almost a year ago. Still not fixed...
Microsoft is really showing their last, valiant, UWP-developers respect. NOT.
Should be fixed on 2.3.5-pre1
Have verified the bug with latest forms build version 188.8.131.526-pre6.
Issue is seems to be fixed with latest build as well.
Now the fixed code is added in the forms samples & user is able to see the correct location on map.