Another Screensaver with WPF

using System;
using System.Diagnostics;
using System.Windows;
using System.Windows.Markup;
using System.Windows.Media;

namespace RZWScreenSaver.UI {
    /// <summary>
    /// Interaction logic for Postcard.xaml
    /// </summary>
    [ContentProperty("Source")]
    public partial class Postcard{
        const int NormalShadowAngle = 315;
        public Postcard() {
            InitializeComponent();
        }
        public Size Size{
            get { return new Size(picture.Width, picture.Height); }
            set{
                picture.Width = value.Width;
#if DEBUG
                if (Math.Abs(picture.Height - value.Height) > 0.001){
                    Debug.WriteLine("Height mismatch: " + picture.Height + " and " + value.Height);
                }
#endif
            }
        }
        public double Angle{
            get { return cardRotator.Angle; }
            set{
                cardRotator.Angle = value;
                shadow.Direction = NormalShadowAngle + value;
            }
        }
        public ImageSource Source{
            get { return picture.Source; }
            set { picture.Source = value; }
        }
    }
}