Angle.cs

using System.Threading.Tasks;
using System.Xml;
using Waher.Layout.Layout2D.Model.Attributes;
 
namespace Waher.Layout.Layout2D.Model
{
    public abstract class Angle : LayoutElement
    {
        private FloatAttribute degrees;
 
        public Angle(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public FloatAttribute DegreesAttribute
        {
            get => this.degrees;
            set => this.degrees = value;
        }
 
        public override Task FromXml(XmlElement Input)
        {
            this.degrees = new FloatAttribute(Input, "degrees", this.Document);
            return base.FromXml(Input);
        }
 
        public override void ExportAttributes(XmlWriter Output)
        {
            base.ExportAttributes(Output);
 
            this.degrees?.Export(Output);
        }
 
        public override void CopyContents(ILayoutElement Destination)
        {
            base.CopyContents(Destination);
 
            if (Destination is Angle Dest)
                Dest.degrees = this.degrees?.CopyIfNotPreset(Destination.Document);
        }
 
        public override async Task DoMeasureDimensions(DrawingState State)
        {
            await base.DoMeasureDimensions(State);
 
            EvaluationResult<float> Degrees = await this.degrees.TryEvaluate(State.Session);
            this.angle = Degrees.Result;
            this.defined &= Degrees.Ok;
        }
 
        protected float angle;
 
        public override void ExportStateAttributes(XmlWriter Output)
        {
            base.ExportStateAttributes(Output);
 
            this.degrees?.ExportState(Output);
        }
 
    }
}