Windows Phone 8.1获取地图角Geopoint

Question

I trying to find the Geopoint of corners

• TopLeft
• TopRight
• BottomLeft
• BottomRight

The information that MapControl provides is

• Center (Geopoint)
• ZoomLevel (Double min:1, max:20)
• ActualHeight (Double)
• ActualWidth (Double)

Based on that information can I find the corners?

I was thinking something like that:

double HalfHeight = Map.ActualHeight / 2;
double HalfWidth = Map.ActualWidth / 2;

So that means that Center Geopoint is located on HalfWdidth (X) and HalfHeight (Y). Can somehow this help me?

Edit: My problem was very similar with this question as rbrundritt mentioned but it was giving only TopLeft and BottomRight. Based on the accepted answer of that question (which is by rbrundritt) I also completed the other two and wrapped them in Extension, check my answer below. Thank you rbrundritt.

Answer 1

public static class MapExtensions
{
    private static Geopoint GetCorner(this MapControl Map, double x, double y, bool top)
    {
        Geopoint corner = null;

        try
        {
            Map.GetLocationFromOffset(new Point(x, y), out corner);
        }
        catch
        {
            Geopoint position = new Geopoint(new BasicGeoposition()
            {
                Latitude = top ? 85 : -85,
                Longitude = 0
            });

            Point point;
            Map.GetOffsetFromLocation(position, out point);
            Map.GetLocationFromOffset(new Point(0, point.Y), out corner);
        }

        return corner;
    }

    public static Geopoint GetTopLeftCorner(this MapControl Map)
    {
        return Map.GetCorner(0, 0, true);
    }

    public static Geopoint GetBottomLeftCorner(this MapControl Map)
    {
        return Map.GetCorner(0, Map.ActualHeight, false);
    }

    public static Geopoint GetTopRightCorner(this MapControl Map)
    {
        return Map.GetCorner(Map.ActualWidth, 0, true);
    }

    public static Geopoint GetBottomRightCorner(this MapControl Map)
    {
        return Map.GetCorner(Map.ActualWidth, Map.ActualHeight, false);
    }
}