public override void RefreshData(FetchInfo fetchInfo)
{
// RefreshData needs no implementation for the MemoryLayer. Calling OnDataChanged here
// would trigger an extra needless render iteration.
// If a user changed the data in the provider and needs to update the graphics
// DataHasChanged should be called.
}
public override IEnumerable <IFeature> GetFeatures(MRect?box, double resolution)
{
// Safeguard in case BoundingBox is null, most likely due to no features in layer
if (box == null)
{
return(new List <IFeature>());
}
var biggerBox = box.Grow(
SymbolStyle.DefaultWidth * 2 * resolution,
SymbolStyle.DefaultHeight * 2 * resolution);
var fetchInfo = new FetchInfo(biggerBox, resolution, CRS);
return(DataSource?.GetFeatures(fetchInfo) ?? Array.Empty <IFeature>());
}