Hi,
I am using SimpleMarkerOverlay.GetMarkersForDrawing to get markers in a boundary. But, it always return all the markers in the Overlay. Is there any way to query in the Simple marker overlay to get markers that is in a particular boundary?
Regards,
Raquib
Hi Raquibur,
Just as you have mentioned, the SimpleMarkerOverlay.GetMarkersForDrawing does return all the markers every time. This is due to some internal usage issues.
You can get markers in a specific extent by writing an extension method for SimpleMarkerOverlay, here is a sample that may be of help:public static class SimpleMarkerOverlayExtension
{
public static GeoCollection<Marker> GetMarkersInExtent(this SimpleMarkerOverlay overlay, RectangleShape extent)
{
double minX = extent.UpperLeftPoint.X;
double maxX = extent.LowerRightPoint.X;
double minY = extent.LowerRightPoint.Y;
double maxY = extent.UpperLeftPoint.Y;
var markersInExtent = overlay.Markers
.Where(marker => marker.Position.X <= maxX
&& marker.Position.X >= minX
&& marker.Position.Y <= maxY
&& marker.Position.Y >= minY);
GeoCollection<Marker> result = new GeoCollection<Marker>();
foreach (var marker in markersInExtent)
{
result.Add(marker);
}
return result;
}
}
Then you can call the method like this:private void TestSimpleMarkerOverlay()
{
SimpleMarkerOverlay simpleMarkerOverlay = new SimpleMarkerOverlay();
simpleMarkerOverlay.Markers.Add(new Marker(0, 0));
simpleMarkerOverlay.Markers.Add(new Marker(20, 20));
int count1 = simpleMarkerOverlay.GetMarkersInExtent(new RectangleShape(-1, 1, 1, -1)).Count;
int count2 = simpleMarkerOverlay.GetMarkersInExtent(new RectangleShape(19, 21, 21, 19)).Count;
int count3 = simpleMarkerOverlay.GetMarkersInExtent(new RectangleShape(-180, 90, 90, -180)).Count;
}
And then you’ll notice that count1 equals to 1, count2 equals to 1 and count3 equals to 2.
Regards,
Tsui