public override bool ShouldCull(MapRegion region)
{
if (Positions == null || Positions.Count == 0)
{
return(true);
}
return(Positions.All(x => !region.Contains(x)));
}
public static bool Contains(
this MapRegion region,
Position position)
{
if (region == null)
{
return(false);
}
return(region.ToBounds().Contains(position));
}
public static bool Contains(
this MapRegion region,
Bounds bounds)
{
if (region == null || bounds == null)
{
return(false);
}
return(region.ToBounds().Intersects(bounds));
}
public override void UpdateMapRegion(MapRegion region)
{
base.UpdateMapRegion(region);
Region = region;
if (region == null)
{
return;
}
if (!IsVisible)
{
return;
}
Center = region.GetCenter();
if (lastCullCenter.HasValue && CullUpdateThreshold.Meters > 0 &&
MapLocationSystem.CalculateDistance(Center, lastCullCenter.Value) < CullUpdateThreshold)
{
return;
}
if (MaxRunningTasks.HasValue && activeTasksCount >= MaxRunningTasks)
{
Push();
return;
}
if (lastQueryCenter.HasValue && QueryThreshold.Meters > 0 &&
MapLocationSystem.CalculateDistance(Center, lastQueryCenter.Value) < QueryThreshold)
{
Push();
return;
}
lastQueryCenter = Center;
Task.Run(DoAsync);
}
public static Bounds ToBounds(this MapRegion region)
{
var points = new[]
{
region.NearLeft,
region.NearRight,
region.FarLeft,
region.FarRight
};
var min = (
lat : points.Min(x => x.Latitude),
lng : points.Min(x => x.Longitude));
var max = (
lat : points.Max(x => x.Latitude),
lng : points.Max(x => x.Longitude));
return(new Bounds(
new Position(min.lat, min.lng),
new Position(max.lat, max.lng)));
}
public override bool ShouldCull(MapRegion region)
{
return(!region.Contains(Bounds));
}