Silverlight 动画效果2

这个动画绕x轴旋转加上位置偏移

参考代码:

        public MainPage()
        {
            InitializeComponent();
            button2.Visibility = Visibility.Collapsed;
        }
        int n = -512;
        private void button1_Click(object sender,RoutedEventArgs e)
        {
            button2.Projection = new PlaneProjection { 
                RotationX=n<0?270:0
            };
            
                
            button2.Visibility = Visibility.Visible;
            if (n < 0) button2.Margin = new Thickness(512,button2.Margin.Top,0);
            else button2.Margin = new Thickness(0,0);
            var st = new Storyboard();
            st.Completed += (a,b) =>
            {
                if (n < 0)
                    button2.Visibility = Visibility.Collapsed;
            };
            var a1 = new DoubleAnimation
            {
                To=n<0?0:-270,Duration=TimeSpan.FromSeconds(0.75),AutoReverse=false

            };
            Storyboard.SetTarget(a1,button2.Projection);
            Storyboard.SetTargetProperty(a1,new PropertyPath("RotationX"));
            st.Children.Add(a1);
            var a2 = new DoubleAnimation
            {
                To = n,Duration = TimeSpan.FromSeconds(0.75),AutoReverse = false

            };
            Storyboard.SetTarget(a2,button2.Projection);
            Storyboard.SetTargetProperty(a2,new PropertyPath("LocalOffsetX"));
            st.Children.Add(a2);           
            st.Begin();
            n *= -1;

        }