private async Task RefreshPolygonsAsync()
{
if (_visibleRegion == null)
{
return;
}
int layer = _hexagonal.CalculateLayerFromCameraPositionZoom(_currentCameraIdledEventArgs.Position.Zoom);
if (layer != _layerLast)
{
Polygons.Clear();
_layerLast = layer;
}
_hexagonal.Initialize(_currentCameraIdledEventArgs.Position.Target.Latitude, _currentCameraIdledEventArgs.Position.Target.Longitude, layer);
for (int row = -2; row < 3; ++row)
{
for (int col = -2; col < 3; ++col)
{
var poly = _hexagonal.HexagonalPolygon(_hexagonal.CenterLocation, col, row);
if (Polygons.Any(p => p.PolygonTagEquals(poly)))
{
continue;
}
int heatCount = _layerService.NumberOfUsersInsidePolygonTag(poly.ExtractPolygonTag().Tag);
poly.FillColor = _heatGradientService.SteppedColor(heatCount);
poly.IsClickable = true;
poly.Clicked += Polygon_Clicked;
if (poly.PolygonTagStringEquals(_currentPositionTag))
{
poly.StrokeColor = Color.Coral;
poly.StrokeWidth = 5;
}
else
{
poly.StrokeColor = _heatGradientService.SteppedColor(heatCount + 1);
poly.StrokeWidth = 1;
}
Polygons.Add(poly);
}
}
await RefreshZonesAsync();
}