Adds jittering. (#4809)

Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>

Content.Shared/Jittering/JitteringComponent.cs

@@ -0,0 +1,44 @@
+using System;
+using Robust.Shared.Analyzers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameStates;
+using Robust.Shared.Maths;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Shared.Jittering
+{
+    [Friend(typeof(SharedJitteringSystem))]
+    [RegisterComponent, NetworkedComponent]
+    public class JitteringComponent : Component
+    {
+        public override string Name => "Jittering";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public TimeSpan EndTime { get; set; }
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float Amplitude { get; set; }
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float Frequency { get; set; }
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public Vector2 LastJitter { get; set; }
+    }
+
+    [Serializable, NetSerializable]
+    public class JitteringComponentState : ComponentState
+    {
+        public TimeSpan EndTime { get; }
+        public float Amplitude { get; }
+        public float Frequency { get; }
+
+        public JitteringComponentState(TimeSpan endTime, float amplitude, float frequency)
+        {
+            EndTime = endTime;
+            Amplitude = amplitude;
+            Frequency = frequency;
+        }
+    }
+}