AnimationExtensions.cs

using System;
using System.Numerics;
using Windows.UI.Composition;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Media.Animation;

namespace Continuity.Extensions
{
    public static class AnimationExtensions
    {
        #region Composition
   
        public static ScalarKeyFrameAnimation CreateScalarKeyFrameAnimation(this Compositor compositor, float? from, float to,
            double duration, double delay, CompositionEasingFunction easing, AnimationIterationBehavior iterationBehavior)
        {
            var animation = compositor.CreateScalarKeyFrameAnimation();

            animation.Duration = TimeSpan.FromMilliseconds(duration);
            if (!delay.Equals(0)) animation.DelayTime = TimeSpan.FromMilliseconds(delay);
            if (from.HasValue) animation.InsertKeyFrame(0.0f, from.Value, easing);
            animation.InsertKeyFrame(1.0f, to, easing);
            animation.IterationBehavior = iterationBehavior;

            return animation;
        }

        public static Vector2KeyFrameAnimation CreateVector2KeyFrameAnimation(this Compositor compositor, Vector2? from, Vector2 to,
            double duration, double delay, CompositionEasingFunction easing, AnimationIterationBehavior iterationBehavior)
        {
            var animation = compositor.CreateVector2KeyFrameAnimation();

            animation.Duration = TimeSpan.FromMilliseconds(duration);
            animation.DelayTime = TimeSpan.FromMilliseconds(delay);
            if (from.HasValue) animation.InsertKeyFrame(0.0f, from.Value, easing);
            animation.InsertKeyFrame(1.0f, to, easing);
            animation.IterationBehavior = iterationBehavior;

            return animation;
        }

        public static Vector3KeyFrameAnimation CreateVector3KeyFrameAnimation(this Compositor compositor, Vector2? from, Vector2 to,
            double duration, double delay, CompositionEasingFunction easing, AnimationIterationBehavior iterationBehavior)
        {
            var animation = compositor.CreateVector3KeyFrameAnimation();

            animation.Duration = TimeSpan.FromMilliseconds(duration);
            animation.DelayTime = TimeSpan.FromMilliseconds(delay);
            if (from.HasValue) animation.InsertKeyFrame(0.0f, new Vector3(from.Value, 1.0f), easing);
            animation.InsertKeyFrame(1.0f, new Vector3(to, 1.0f), easing);
            animation.IterationBehavior = iterationBehavior;

            return animation;
        }

        public static Vector3KeyFrameAnimation CreateVector3KeyFrameAnimation(this Compositor compositor, Vector3? from, Vector3 to,
            double duration, double delay, CompositionEasingFunction easing, AnimationIterationBehavior iterationBehavior)
        {
            var animation = compositor.CreateVector3KeyFrameAnimation();

            animation.Duration = TimeSpan.FromMilliseconds(duration);
            animation.DelayTime = TimeSpan.FromMilliseconds(delay);
            if (from.HasValue) animation.InsertKeyFrame(0.0f, from.Value, easing);
            animation.InsertKeyFrame(1.0f, to, easing);
            animation.IterationBehavior = iterationBehavior;

            return animation;
        }

        #endregion

        #region Xaml Storyboard

        public static void Animate(this DependencyObject target, double? from, double to,
          string propertyPath, int duration = 400, int startTime = 0,
          EasingFunctionBase easing = null, Action completed = null, bool enableDependentAnimation = false)
        {
            if (easing == null)
            {
                easing = new ExponentialEase();
            }

            var db = new DoubleAnimation
            {
                EnableDependentAnimation = enableDependentAnimation,
                To = to,
                From = from,
                EasingFunction = easing,
                Duration = TimeSpan.FromMilliseconds(duration)
            };
            Storyboard.SetTarget(db, target);
            Storyboard.SetTargetProperty(db, propertyPath);

            var sb = new Storyboard
            {
                BeginTime = TimeSpan.FromMilliseconds(startTime)
            };

            if (completed != null)
            {
                sb.Completed += (s, e) =>
                {
                    completed();
                };
            }

            sb.Children.Add(db);
            sb.Begin();
        }

        #endregion
    }
}