WPF

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Effects;

namespace EffectsExample
{
    class Program
    {
        [STAThread]
        public static void Main()
        {
            var window = new Window();
            var viewbox = new Viewbox();
            var oldText = new TextBlock();
            var text = new TextBlock();
            var effect = new TransitionEffects.BandedSwirlTransitionEffect();
            var animation = new DoubleAnimation(0, 1, new Duration(TimeSpan.FromSeconds(5)));
            animation.RepeatBehavior = RepeatBehavior.Forever;
            animation.AutoReverse = true;
            viewbox.Stretch = Stretch.Fill;
            oldText.Background = Brushes.DeepSkyBlue;
            oldText.Foreground = Brushes.White;
            oldText.Text = "Hello, world!";
            text.Background = Brushes.White;
            text.Foreground = Brushes.DeepSkyBlue;
            text.Text = "Hello, world!";
            text.Effect = effect;
            viewbox.Child = text;
            window.Content = viewbox;
            effect.OldImage = new VisualBrush(oldText);
            effect.BeginAnimation(TransitionEffects.RandomCircleRevealTransitionEffect.ProgressProperty, animation);
            new Application().Run(window);
        }
    }
}