implement equality for Dimension2D

MBS.Framework/Drawing/Dimension2D.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace MBS.Framework.Drawing
 {
-	public class Dimension2D : Dimension
+	public class Dimension2D : Dimension, IEquatable<Dimension2D>
 	{
 		private double mvarWidth = 0.0;
 		public double Width { get { return mvarWidth; } set { mvarWidth = value; } }
@@ -31,5 +33,36 @@ namespace MBS.Framework.Drawing
 		{
 			return Width.ToString() + "x" + Height.ToString();
 		}
+
+		public override bool Equals(object obj)
+		{
+			if (obj is Dimension2D)
+			{
+				return ((Dimension2D)obj).Width.Equals(Width) && ((Dimension2D)obj).Height.Equals(Height);
+			}
+			return base.Equals(obj);
+		}
+		public bool Equals(Dimension2D other)
+		{
+			if ((object)other == null) return (object)this == null;
+			return Width.Equals(other.Width) && Height.Equals(other.Height);
+		}
+
+		public static bool operator ==(Dimension2D left, Dimension2D right)
+		{
+			if ((left is null) && (right is null))
+				return true;
+			if ((left is null) || (right is null))
+				return false;
+			return left.Equals(right);
+		}
+		public static bool operator !=(Dimension2D left, Dimension2D right)
+		{
+			if ((left is null) && (right is null))
+				return false;
+			if ((left is null) || (right is null))
+				return true;
+			return !left.Equals(right);
+		}
 	}
 }