private VisibleVehiclesDelta UpdateVisibleVehicles(VehiclesViewPortUpdate update)
{
var visibleVehiclesNew = new Dictionary <string, VehicleViewModel>();
foreach (var keyValuePair in _vehicles)
{
if (update.VisibleRegion.ContainsPoint(keyValuePair.Value.LocationAnimated))
{
visibleVehiclesNew.Add(keyValuePair.Key, keyValuePair.Value);
}
}
MvxTrace.Trace("{0} visible vehicles, {1} current vehicles are visible", visibleVehiclesNew.Count, _visibleVehicles.Count);
var vehiclesToRemove = new List <VehicleViewModel>();
foreach (var keyValuePair in _visibleVehicles)
{
if (visibleVehiclesNew.ContainsKey(keyValuePair.Key))
{
visibleVehiclesNew.Remove(keyValuePair.Key);
}
else
{
vehiclesToRemove.Add(keyValuePair.Value);
}
}
var animateMovement = this.IsAnimationEnabled(update.Zoom);
MvxTrace.Trace("{0} vehicles should be removed, {1} added", vehiclesToRemove.Count, visibleVehiclesNew.Count);
foreach (var vm in vehiclesToRemove)
{
_visibleVehicles.Remove(vm.VehicleId);
this.ViewDispatcher.RequestMainThreadAction(() =>
{
vm.IsInView = false;
vm.AnimateMovement = false;
});
}
foreach (var vm in visibleVehiclesNew.Values)
{
_visibleVehicles[vm.VehicleId] = vm;
this.ViewDispatcher.RequestMainThreadAction(() =>
{
vm.IsInView = true;
vm.AnimateMovement = animateMovement;
});
}
return(new VisibleVehiclesDelta(visibleVehiclesNew.Values.ToList(), vehiclesToRemove));
}
private void UpdateVehiclesInTheViewPort(VehiclesViewPortUpdate update)
{
MvxTrace.Trace("Updating vehicles in the viewport... ");
try
{
this.UpdateVehicles(update.VehicleUpdates);
var mapUpdate = this.UpdateVisibleVehicles(update);
if (mapUpdate.HasUpdates)
{
this.ViewDispatcher.RequestMainThreadAction(() =>
{
this.ViewportUpdate.OnNext(mapUpdate);
});
}
}
catch (Exception ex)
{
Insights.Report(ex, Insights.Severity.Error);
}
}
