Pushpin size at WP7 map control - windows-phone-7

Question

while trying to implement logic that show current user location i encountered an issue.
<Maps:Pushpin Location="{Binding MyLocation}" Canvas.ZIndex="1000" PositionOrigin="Center" >
<Maps:Pushpin.Template>
<ControlTemplate>
<Grid>
<Ellipse Width="{Binding MyAccuracyViewSize}" Height="{Binding MyAccuracyViewSize}"
Fill="#60008000" Stroke="Green" StrokeThickness="3"/>
<Ellipse Width="18" Height="18" Fill="#A0FF4500" VerticalAlignment="Center" HorizontalAlignment="Center" />
</Grid>
</ControlTemplate>
</Maps:Pushpin.Template>
</Maps:Pushpin>
Bigger green circle shows accuracy area. Its size in pixels varies depending on zoom. If zoom level is big - it becomes rather big (> 480 pixels). At that point it gets cropped by screen resolution. AFAIK WP7 restriction is 2000x2000 px for control size.
Seems that this is a kind of a map control restriction.
Any ideas how to remove this restriction to show ellipse of size up to 2000x2000 px?
Thanks!

Answer 1

How about MapPolygon?
void OnPositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
{
SecondsCounter = 0; //reset counter
double accuracy = e.Position.Location.HorizontalAccuracy;
if (accuracy < e.Position.Location.VerticalAccuracy)
{
accuracy = e.Position.Location.VerticalAccuracy;
}
if (PolyCircle == null)
{
PolyCircle = new MapPolygon();
PolyCircle.Opacity = 0.7;
//Set the polygon properties
PolyCircle.Fill = new SolidColorBrush(Colors.Orange);
PolyCircle.Stroke = new SolidColorBrush(Colors.Purple);
PolyCircle.StrokeThickness = 4;
map1.Children.Add(PolyCircle);
}
PolyCircle.Locations = CreateCircle(e.Position.Location, accuracy);
map1.Center = e.Position.Location;
}
public static double ToRadian(double degrees)
{
return degrees * (Math.PI / 180);
}
public static double ToDegrees(double radians)
{
return radians * (180 / Math.PI);
}
public static LocationCollection CreateCircle(GeoCoordinate center, double radius)
{
var earthRadius = 6367000; // radius in meters
var lat = ToRadian(center.Latitude); //radians
var lng = ToRadian(center.Longitude); //radians
var d = radius / earthRadius; // d = angular distance covered on earth's surface
var locations = new LocationCollection();
for (var x = 0; x <= 360; x++)
{
var brng = ToRadian(x);
var latRadians = Math.Asin(Math.Sin(lat) * Math.Cos(d) + Math.Cos(lat) * Math.Sin(d) * Math.Cos(brng));
var lngRadians = lng + Math.Atan2(Math.Sin(brng) * Math.Sin(d) * Math.Cos(lat), Math.Cos(d) - Math.Sin(lat) * Math.Sin(latRadians));
locations.Add(new GeoCoordinate(ToDegrees(latRadians), ToDegrees(lngRadians)));
}
return locations;
}
More here, in My Map position example. Good luck!