Add project files.

Examples/Nodify.Shapes/Canvas/Shapes/EllipseViewModel.cs

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+using System.Windows.Media;
+
+namespace Nodify.Shapes.Canvas
+{
+    public class EllipseViewModel : ShapeViewModel
+    {
+        public EllipseViewModel()
+        {
+            Color = Color.FromRgb(67, 141, 87);
+            Text = "Ellipse";
+        }
+    }
+}

Examples/Nodify.Shapes/Canvas/Shapes/RectangleViewModel.cs

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+using System.Windows.Media;
+
+namespace Nodify.Shapes.Canvas
+{
+    public class RectangleViewModel : ShapeViewModel
+    {
+        public RectangleViewModel()
+        {
+            Color = Color.FromRgb(63, 138, 226);
+            Text = "Rectangle";
+        }
+    }
+}

Examples/Nodify.Shapes/Canvas/Shapes/ShapeViewModel.cs

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+using Nodify.UndoRedo;
+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Media;
+
+namespace Nodify.Shapes.Canvas
+{
+    public abstract class ShapeViewModel : Undoable
+    {
+        public ShapeViewModel(IActionsHistory history) : base(history)
+        {
+            RecordProperty<ShapeViewModel>(x => x.Color);
+            RecordProperty<ShapeViewModel>(x => x.Text);
+        }
+
+        public ShapeViewModel() : this(ActionsHistory.Global)
+        {
+        }
+
+        public static readonly IReadOnlyList<Color> Colors = new Color[]
+        {
+            Color.FromRgb(207, 76, 44),
+            Color.FromRgb(234, 156, 65),
+            Color.FromRgb(235, 195, 71),
+            Color.FromRgb(67, 141, 87),
+            Color.FromRgb(63, 138, 226),
+            Color.FromRgb(128, 61, 236),
+        };
+
+        private Point _location;
+        public Point Location
+        {
+            get => _location;
+            set => SetProperty(ref _location, value);
+        }
+
+        private double _width;
+        public double Width
+        {
+            get => _width;
+            set => SetProperty(ref _width, value);
+        }
+
+        private double _height;
+        public double Height
+        {
+            get => _height;
+            set => SetProperty(ref _height, value);
+        }
+
+        private Color _color;
+        public Color Color
+        {
+            get => _color;
+            set => SetProperty(ref _color, value).Then(x => OnPropertyChanged(nameof(BorderColor)));
+        }
+
+        public Color BorderColor => Color * 1.5f;
+
+        private string? _text;
+        public string? Text
+        {
+            get => _text;
+            set => SetProperty(ref _text, value);
+        }
+
+        public ConnectorViewModel LeftConnector { get; } = new ConnectorViewModel(ConnectorPosition.Left);
+        public ConnectorViewModel RightConnector { get; } = new ConnectorViewModel(ConnectorPosition.Right);
+        public ConnectorViewModel TopConnector { get; } = new ConnectorViewModel(ConnectorPosition.Top);
+        public ConnectorViewModel BottomConnector { get; } = new ConnectorViewModel(ConnectorPosition.Bottom);
+    }
+}

Examples/Nodify.Shapes/Canvas/Shapes/TriangleViewModel.cs

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+using System.Windows.Media;
+
+namespace Nodify.Shapes.Canvas
+{
+    public class TriangleViewModel : ShapeViewModel
+    {
+        public TriangleViewModel()
+        {
+            Color = Color.FromRgb(235, 195, 71);
+            Text = "Triangle";
+        }
+    }
+}