QuadraticTo.cs

using System.Threading.Tasks;
using SkiaSharp;
 
namespace Waher.Layout.Layout2D.Model.Figures.SegmentNodes
{
    public class QuadraticTo : Point2, ISegment, IDirectedElement
    {
        public QuadraticTo(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public override string LocalName => "QuadraticTo";
 
        public override ILayoutElement Create(Layout2DDocument Document, ILayoutElement Parent)
        {
            return new QuadraticTo(Document, Parent);
        }
 
        public virtual Task Measure(DrawingState State, PathState PathState)
        {
            if (this.defined)
            {
                PathState.Set(this.xCoordinate, this.yCoordinate);
                PathState.Set(this.xCoordinate2, this.yCoordinate2);
            }
        
            return Task.CompletedTask;
        }
 
        public virtual Task Draw(DrawingState State, PathState PathState, SKPath Path)
        {
            if (this.defined)
            {
                this.P0 = Path.LastPoint;
                this.P1 = new SKPoint(this.xCoordinate, this.yCoordinate);
                this.P2 = new SKPoint(this.xCoordinate2, this.yCoordinate2);
 
                PathState.Set(this.xCoordinate, this.yCoordinate);
                PathState.Set(this.xCoordinate2, this.yCoordinate2);
                Path.QuadTo(this.P1, this.P2);
            }
        
            return Task.CompletedTask;
        }
 
        protected SKPoint P0;
 
        protected SKPoint P1;
 
        protected SKPoint P2;
 
        public bool TryGetStart(out float X, out float Y, out float Direction)
        {
            float dx = P1.X - P0.X;
            float dy = P1.Y - P0.Y;
 
            X = this.P0.X;
            Y = this.P0.Y;
            Direction = CalcDirection(dx, dy);
 
            return this.defined;
        }
 
        public bool TryGetEnd(out float X, out float Y, out float Direction)
        {
            float dx = P2.X - P1.X;
            float dy = P2.Y - P1.Y;
 
            X = this.P2.X;
            Y = this.P2.Y;
            Direction = CalcDirection(dx, dy);
 
            return this.defined;
        }
 
    }
}