private static HashSet <Coordinate> ExtractCoordinates(Geometry geom)
{
// DEVIATION: UniqueCoordinateArrayFilter is expensive (until we port 5e01aea, anyway).
// Nobody actually needs the original input to be Coordinate[], and the original array
// could never be used as-is because we could never assume that it's unique.
var filter = new CustomUniqueCoordinateFilter();
geom?.Apply(filter);
return(filter.Coordinates);
}
/// <summary>
/// Computes the convex hull for the given sequence of <see cref="Geometry"/> instances.
/// </summary>
/// <param name="geoms">
/// The <see cref="Geometry"/> instances whose convex hull to compute.
/// </param>
/// <returns>
/// The convex hull of <paramref name="geoms"/>.
/// </returns>
public static Geometry Create(IEnumerable <Geometry> geoms)
{
GeometryFactory factory = null;
var filter = new CustomUniqueCoordinateFilter();
foreach (var geom in geoms ?? Enumerable.Empty <Geometry>())
{
if (geom is null)
{
continue;
}
if (factory is null)
{
factory = geom.Factory;
}
geom.Apply(filter);
}
return(new ConvexHull(filter.Coordinates, factory).GetConvexHull());
}
