ECS Buckle and Rotation visualizers (#13024)

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Client/Rotation/RotationVisualizerSystem.cs

@@ -0,0 +1,73 @@
+using Robust.Client.GameObjects;
+using Robust.Client.Animations;
+using Content.Shared.Rotation;
+using Robust.Shared.Animations;
+
+namespace Content.Client.Rotation;
+
+public sealed class RotationVisualizerSystem : VisualizerSystem<RotationVisualsComponent>
+{
+    protected override void OnAppearanceChange(EntityUid uid, RotationVisualsComponent component, ref AppearanceChangeEvent args)
+    {
+        base.OnAppearanceChange(uid, component, ref args);
+
+        if (args.Sprite != null)
+        {
+            // if TryGetData fails, state defaults to RotationState.Vertical.
+            args.Component.TryGetData<RotationState>(RotationVisuals.RotationState, out var state);
+
+            switch (state)
+            {
+                case RotationState.Vertical:
+                    AnimateSpriteRotation(args.Sprite, component.VerticalRotation, component.AnimationTime);
+                    break;
+                case RotationState.Horizontal:
+                    AnimateSpriteRotation(args.Sprite, component.HorizontalRotation, component.AnimationTime);
+                    break;
+            }
+        }
+    }
+
+    /// <summary>
+    ///     Rotates a sprite between two animated keyframes given a certain time.
+    /// </summary>
+    public void AnimateSpriteRotation(SpriteComponent sprite, Angle rotation, float animationTime)
+    {
+        var entMan = IoCManager.Resolve<IEntityManager>();
+
+        if (sprite.Rotation.Equals(rotation))
+        {
+            return;
+        }
+
+        if (!entMan.TryGetComponent(sprite.Owner, out AnimationPlayerComponent? animation))
+        {
+            sprite.Rotation = rotation;
+            return;
+        }
+
+        if (animation.HasRunningAnimation("rotate"))
+        {
+            animation.Stop("rotate");
+        }
+
+        animation.Play(new Animation
+        {
+            Length = TimeSpan.FromSeconds(animationTime),
+            AnimationTracks =
+            {
+                new AnimationTrackComponentProperty
+                {
+                    ComponentType = typeof(ISpriteComponent),
+                    Property = nameof(ISpriteComponent.Rotation),
+                    InterpolationMode = AnimationInterpolationMode.Linear,
+                    KeyFrames =
+                    {
+                        new AnimationTrackProperty.KeyFrame(sprite.Rotation, 0),
+                        new AnimationTrackProperty.KeyFrame(rotation, animationTime)
+                    }
+                }
+            }
+        }, "rotate");
+    }
+}