Polygon.cs

using System.Threading.Tasks;
using SkiaSharp;
using Waher.Layout.Layout2D.Model.References;
 
namespace Waher.Layout.Layout2D.Model.Figures
{
    public class Polygon : Vertices
    {
        public Polygon(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public override string LocalName => "Polygon";
 
        public override ILayoutElement Create(Layout2DDocument Document, ILayoutElement Parent)
        {
            return new Polygon(Document, Parent);
        }
 
        public override async Task Draw(DrawingState State)
        {
            if (this.defined)
            {
                using (SKPath Path = new SKPath())
                {
                    Vertex First = null;
 
                    foreach (Vertex V in this.points)
                    {
                        if (First is null)
                        {
                            Path.MoveTo(V.XCoordinate, V.YCoordinate);
                            First = V;
                        }
                        else
                            Path.LineTo(V.XCoordinate, V.YCoordinate);
                    }
 
                    Path.Close();
 
                    SKPaint Fill = await this.TryGetFill(State);
                    if (!(Fill is null))
                        State.Canvas.DrawPath(Path, Fill);
 
                    SKPaint Pen = await this.TryGetPen(State);
                    if (!(Pen is null))
                        State.Canvas.DrawPath(Path, Pen);
                }
            }
 
            await base.Draw(State);
        }
    }
}