Did a lot of work just unit testing left

Shapes/Rectangle.cs

@@ -1,21 +1,34 @@
 using System;
 using System.Collections.Generic;
 using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Runtime.Serialization;
 
 namespace Shapes
 {
-    public class Rectangle : Shape
+    [DataContract]
+    public class Rectangle : GeometricShape
     {
-        public override List<Point> Points { get; }
-        
+        [DataMember]
+        public override List<Point> Points { get; internal set; }
+        [DataMember]
+        public override Color Fill { get; set; }
+        [DataMember]
+        public override Color Stroke { get; set; }
+        [DataMember]
         public List<Line> Lines { get; }
-        public override Point CenterPoint { get; }
-        public sealed override double Width { get;  }
-        public sealed override double Height { get; }
+        [DataMember]
+        public override Point CenterPoint { get; protected set; }
+        [DataMember]
+        public sealed override double Width { get; internal set; }
+        [DataMember]
+        public sealed override double Height { get; internal set; }
 
 
         public Rectangle(Point point1, Point point2, Point point3, Point point4)
         {
+            Stroke = Color.Black;
             Points = new List<Point>();
             Lines = new List<Line>();
             
@@ -38,6 +51,7 @@ namespace Shapes
 
         public Rectangle(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
         {
+            Stroke = Color.Black;
             Points = new List<Point>();
             var point1 = new Point(x1, y1);
             var point2 = new Point(x2, y2);
@@ -49,12 +63,13 @@ namespace Shapes
             Points.Add(point4);
             Height = new Line(point1, point2).ComputeLength();
             Width = new Line(point1, point4).ComputeLength();
-            CenterPoint = new Point((point1.X + Width)/2, (point1.Y + Height)/2);
+            ComputeCenter();
             Validator.ValidateRectangle(Points, $"Attempted to create an invalid shape {this.GetType()}");
         }
 
         public Rectangle(Point point, Size size)
         {
+            Stroke = Color.Black;
             Points = new List<Point>();
             var point1 = point;
             var point2 = new Point(point.X + size.Width, point.Y);
@@ -66,7 +81,7 @@ namespace Shapes
             Points.Add(point4);
             Height = new Line(point1, point2).ComputeLength();
             Width = new Line(point1, point4).ComputeLength();
-            CenterPoint = new Point((point1.X + Width)/2, (point1.Y + Height)/2);
+            ComputeCenter();
             Validator.ValidateRectangle(Points, $"Attempted to create an invalid shape {this.GetType()}");
         }
         
@@ -77,7 +92,42 @@ namespace Shapes
 
         public override void Scale(double scaleFactor)
         {
-            throw new System.NotImplementedException();
+            foreach (var point in Points)
+            {
+                point.X *= scaleFactor;
+                point.Y *= scaleFactor;
+            }
+            foreach (var line in Lines)
+            {
+                line.Point1.X *= scaleFactor;
+                line.Point1.Y *= scaleFactor;
+                line.Point2.X *= scaleFactor;
+                line.Point2.Y *= scaleFactor;
+            }
+        }
+
+        public override void Save(Stream stream)
+        {
+            var fileWriter = new FileIO();
+            fileWriter.SaveShape(stream, this);
+        }
+
+        public override void Draw(Stream stream)
+        {
+            var tmp = new Bitmap(1000, 1000);
+            Pen blackPen = new Pen(Stroke, 3);
+            // Draw line to screen.
+            using (var graphics = Graphics.FromImage(tmp))
+            {
+                for (int i = 1; i < Points.Count; i++)
+                    graphics.DrawLine(blackPen, 
+                        (float) Points[i - 1].X, 
+                        (float) Points[i - 1].Y,
+                        (float) Points[i].X,
+                        (float) Points[i].Y);
+            }
+
+            tmp.Save(stream, ImageFormat.Jpeg);
         }
 
         public double CalculateWidth()
@@ -91,6 +141,10 @@ namespace Shapes
             return new Line(Points[0], Points[1]).ComputeLength();
         }
 
+        internal override void ComputeCenter()
+        {
+            CenterPoint = new Point((Points[0].X + Width)/2, (Points[0].Y + Height)/2);
+        }