Question

How can I zoom the Microsoft.Phone.Controls.Maps.Map control to the correct zoom level on Windows Phone 7?

I have a LocationCollection of GeoCoordinates and I calculated the Center myself, but now how do I calculate the correct zoom level to fit the LocationCollection?

P.S. Is there an out of the box method to calculate the center of GeoCoordinates so I don’t have to calculate it myself?

EDIT:
I’ve found another fine solution: http://4mkmobile.com/2010/09/quick-tip-position-a-map-based-on-a-collection-of-pushpins/

map.SetView(LocationRect.CreateLocationRect(points));

Answer 1

You can use the following code to calculate the LocationRect that bounds a set of points, and then pass the LocationRect to the SetView() method on the map control:

var bounds = new LocationRect(
    points.Max((p) => p.Latitude),
    points.Min((p) => p.Longitude),
    points.Min((p) => p.Latitude),
    points.Max((p) => p.Longitude));
map.SetView(bounds);

The map control handles animating from the current position to the new location.

NOTE: You’ll need a using statement for System.Linq to get the Min and Max methods.