Vertices.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using System.Xml;
using Waher.Layout.Layout2D.Model.References;
 
namespace Waher.Layout.Layout2D.Model.Figures
{
    public abstract class Vertices : Figure
    {
        protected Vertex[] points;
 
        public Vertices(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public override async Task FromXml(XmlElement Input)
        {
            await base.FromXml(Input);
            this.points = this.GetVertices();
        }
 
        private Vertex[] GetVertices()
        {
            List<Vertex> Result = null;
 
            if (this.HasChildren)
            {
                foreach (ILayoutElement Child in this.Children)
                {
                    if (Child is Vertex P)
                    {
                        if (Result is null)
                            Result = new List<Vertex>();
 
                        Result.Add(P);
                    }
                }
            }
 
            return Result?.ToArray();
        }
 
        public override void CopyContents(ILayoutElement Destination)
        {
            base.CopyContents(Destination);
 
            if (Destination is Vertices Dest)
                Dest.points = Dest.GetVertices();
        }
 
    }
}