TwoCoordinates.cs

using System;
using SkiaSharp;
using System.Xml;
using System.Threading.Tasks;
 
namespace Waher.Script.Graphs.Canvas2D.Operations
{
    public abstract class TwoCoordinates : OneCoordinate
    {
        private float x2;
        private float y2;
 
        public TwoCoordinates()
            : base()
        {
        }
 
        public TwoCoordinates(float X1, float Y1, float X2, float Y2)
            : base(X1, Y1)
        {
            this.x2 = X2;
            this.y2 = Y2;
        }
 
        public float X2 => this.x2;
 
        public float Y2 => this.y2;
 
        public float Width => this.x2 - this.X;
 
        public float Height => this.y2 - this.Y;
 
        public override bool Equals(object obj)
        {
            return (obj is TwoCoordinates Obj &&
                this.x2 == Obj.x2 &&
                this.y2 == Obj.y2 &&
                base.Equals(Obj));
        }
 
        public override int GetHashCode()
        {
            int Result = this.x2.GetHashCode();
            Result ^= Result << 5 ^ this.y2.GetHashCode();
            Result ^= Result << 5 ^ base.GetHashCode();
            return Result;
        }
 
        public override void ExportGraph(XmlWriter Output)
        {
            Output.WriteAttributeString("x2", Expression.ToString(this.x2));
            Output.WriteAttributeString("y2", Expression.ToString(this.y2));
            base.ExportGraph(Output);
        }
 
        public override Task ImportGraph(XmlElement Xml, Variables _)
        {
            foreach (XmlAttribute Attr in Xml.Attributes)
            {
                switch (Attr.Name)
                {
                    case "x2":
                        if (Expression.TryParse(Attr.Value, out float Value))
                            this.x2 = Value;
                        break;
 
                    case "y2":
                        if (Expression.TryParse(Attr.Value, out Value))
                            this.y2 = Value;
                        break;
                }
            }
 
            return Task.CompletedTask;
        }
    }
}