public override MKAnnotationView GetViewForAnnotation(MKMapView mapView, IMKAnnotation annotation)
{
MKAnnotationView anView;
Int32 annotationType =
Convert.ToInt32(annotation is MKUserLocation) * 1 +
Convert.ToInt32(annotation is CustomAnnotation) * 2;
switch (annotationType)
{
case 1:
{
return(null);
}
case 2:
{
CustomAnnotation customAnnotation = annotation as CustomAnnotation;
anView = new MKAnnotationView(annotation, cId);
UILabel DocCountLabel = new UILabel();
DocCountLabel.Frame = new CGRect(-25, -25, 50, 50);
DocCountLabel.BackgroundColor = UIColor.Red;
DocCountLabel.TextColor = UIColor.White;
DocCountLabel.TextAlignment = UITextAlignment.Center;
DocCountLabel.Font = UIFont.BoldSystemFontOfSize(25f);
if (null == customAnnotation.Annotations)
{
DocCountLabel.Text = customAnnotation.Count.ToString();
}
else
{
DocCountLabel.Text = customAnnotation.Annotations.Count.ToString();
}
DocCountLabel.Layer.MasksToBounds = true;
DocCountLabel.Layer.CornerRadius = 8;
//DocCountLabel.Alpha = 0.5f;
anView.AddSubview(DocCountLabel);
anView.CanShowCallout = true;
break;
}
default:
{
anView = (MKPinAnnotationView)mapView.DequeueReusableAnnotation(pId);
if (anView == null)
{
anView = new MKPinAnnotationView(annotation, pId);
}
((MKPinAnnotationView)anView).PinColor = MKPinAnnotationColor.Red;
anView.CanShowCallout = true;
break;
}
}
return(anView);
}
public List <IMKAnnotation> ClusteredAnnotationsWithinMapRect(MKMapRect rect, double zoomScale, Dictionary <IMKAnnotation, bool> filter)
{
double cellSize = CellSizeForZoomScale(zoomScale);
if (RespondsToSelector != null)
{
cellSize *= RespondsToSelector(this);
}
double scaleFactor = zoomScale / cellSize;
int minX = (int)Math.Floor(rect.MinX * scaleFactor);
int maxX = (int)Math.Floor(rect.MaxX * scaleFactor);
int minY = (int)Math.Floor(rect.MinY * scaleFactor);
int maxY = (int)Math.Floor(rect.MaxY * scaleFactor);
List <IMKAnnotation> clusteredAnnotations = new List <IMKAnnotation>();
lock (this)
{
for (int x = minX; x <= maxX; x++)
{
for (int y = minY; y <= maxY; y++)
{
MKMapRect mapRect = new MKMapRect(x / scaleFactor, y / scaleFactor, 1.0 / scaleFactor, 1.0 / scaleFactor);
BoundingBox mapBox = Utils.BoundingBoxForMapRect(mapRect);
double totalLatitude = 0;
double totalLongitude = 0;
List <IMKAnnotation> annotations = new List <IMKAnnotation>();
_tree.EnumerateAnnotationsInBox(mapBox, delegate(IMKAnnotation annotation)
{
if (filter == null || filter[annotation])
{
totalLatitude += annotation.Coordinate.Latitude;
totalLongitude += annotation.Coordinate.Longitude;
annotations.Add(annotation);
}
});
int count = annotations.Count;
if (count == 1)
{
clusteredAnnotations.AddRange(annotations);
}
if (count > 1)
{
CLLocationCoordinate2D coordinate = new CLLocationCoordinate2D(totalLatitude / count, totalLongitude / count);
CustomAnnotation cluster = new CustomAnnotation()
{
Location = coordinate
};
cluster.Annotations = annotations;
clusteredAnnotations.Add(cluster);
}
}
}
}
return(clusteredAnnotations);
}