RoundedRectangle.cs

using System.Threading.Tasks;
using System.Xml;
using SkiaSharp;
using Waher.Layout.Layout2D.Model.Attributes;
 
namespace Waher.Layout.Layout2D.Model.Figures
{
    public class RoundedRectangle : Rectangle
    {
        private LengthAttribute radiusX;
        private LengthAttribute radiusY;
 
        public RoundedRectangle(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public override string LocalName => "RoundedRectangle";
 
        public LengthAttribute RadiusXAttribute
        {
            get => this.radiusX;
            set => this.radiusX = value;
        }
 
        public LengthAttribute RadiusYAttribute
        {
            get => this.radiusY;
            set => this.radiusY = value;
        }
 
        public override Task FromXml(XmlElement Input)
        {
            this.radiusX = new LengthAttribute(Input, "radiusX", this.Document);
            this.radiusY = new LengthAttribute(Input, "radiusY", this.Document);
 
            return base.FromXml(Input);
        }
 
        public override void ExportAttributes(XmlWriter Output)
        {
            base.ExportAttributes(Output);
 
            this.radiusX?.Export(Output);
            this.radiusY?.Export(Output);
        }
 
        public override ILayoutElement Create(Layout2DDocument Document, ILayoutElement Parent)
        {
            return new RoundedRectangle(Document, Parent);
        }
 
        public override void CopyContents(ILayoutElement Destination)
        {
            base.CopyContents(Destination);
 
            if (Destination is RoundedRectangle Dest)
            {
                Dest.radiusX = this.radiusX?.CopyIfNotPreset(Destination.Document);
                Dest.radiusY = this.radiusY?.CopyIfNotPreset(Destination.Document);
            }
        }
 
        public override async Task DoMeasureDimensions(DrawingState State)
        {
            await base.DoMeasureDimensions(State);
 
            EvaluationResult<Length> RadiusLength = await this.radiusX.TryEvaluate(State.Session);
            if (RadiusLength.Ok)
                State.CalcDrawingSize(RadiusLength.Result, ref this.rx, true, this);
            else
                this.rx = 0;
 
            RadiusLength = await this.radiusY.TryEvaluate(State.Session);
            if (RadiusLength.Ok)
                State.CalcDrawingSize(RadiusLength.Result, ref this.ry, false, (ILayoutElement)this);
            else
                this.ry = 0;
        }
 
        protected float rx;
 
        protected float ry;
 
        public override async Task Draw(DrawingState State)
        {
            if (this.defined)
            {
                SKPaint Fill = await this.TryGetFill(State);
                if (!(Fill is null))
                {
                    State.Canvas.DrawRoundRect(this.xCoordinate, this.yCoordinate,
                        this.xCoordinate2 - this.xCoordinate,
                        this.yCoordinate2 - this.yCoordinate,
                        this.rx, this.ry, Fill);
                }
 
                SKPaint Pen = await this.TryGetPen(State);
                if (!(Pen is null))
                {
                    State.Canvas.DrawRoundRect(this.xCoordinate, this.yCoordinate,
                        this.xCoordinate2 - this.xCoordinate,
                        this.yCoordinate2 - this.yCoordinate,
                        this.rx, this.ry, Pen);
                }
 
                this.defined = false;
                await base.Draw(State);
                this.defined = true;
            }
            else
                await base.Draw(State);
        }
 
        public override void ExportStateAttributes(XmlWriter Output)
        {
            base.ExportStateAttributes(Output);
 
            this.radiusX?.ExportState(Output);
            this.radiusY?.ExportState(Output);
        }
    }
}