From a91a907fc50f2e54644688282d9478315dc0956c Mon Sep 17 00:00:00 2001
From: DrSmugleaf <DrSmugleaf@users.noreply.github.com>
Date: Tue, 28 Jul 2020 15:53:51 +0200
Subject: [PATCH] Add slipping moving you forward a few tiles (#1520)

* Add slipping moving you forward

* Check for weightless and change decay to a multiplier

* Pragma moment
---
 .../Movement/SharedSlipperyComponent.cs       |  6 +++
 Content.Shared/Physics/SlipController.cs      | 40 +++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 Content.Shared/Physics/SlipController.cs

diff --git a/Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs b/Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs
index c0695cb160..f467ac7642 100644
--- a/Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs
+++ b/Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs
@@ -74,6 +74,12 @@ namespace Content.Shared.GameObjects.Components.Movement
                 return false;
             }
 
+            if (entity.TryGetComponent(out ICollidableComponent collidable))
+            {
+                var controller = collidable.EnsureController<SlipController>();
+                controller.LinearVelocity = collidable.LinearVelocity;
+            }
+
             stun.Paralyze(5);
             _slipped.Add(entity.Uid);
 
diff --git a/Content.Shared/Physics/SlipController.cs b/Content.Shared/Physics/SlipController.cs
new file mode 100644
index 0000000000..f5f3004a3f
--- /dev/null
+++ b/Content.Shared/Physics/SlipController.cs
@@ -0,0 +1,40 @@
+using Robust.Shared.Interfaces.Physics;
+using Robust.Shared.IoC;
+using Robust.Shared.Physics;
+
+namespace Content.Shared.Physics
+{
+    public class SlipController : VirtualController
+    {
+#pragma warning disable 649
+        [Dependency] private readonly IPhysicsManager _physicsManager;
+#pragma warning restore 649
+
+        public SlipController()
+        {
+            IoCManager.InjectDependencies(this);
+        }
+
+        private float Decay { get; set; } = 0.95f;
+
+        public override void UpdateAfterProcessing()
+        {
+            if (ControlledComponent == null)
+            {
+                return;
+            }
+
+            if (_physicsManager.IsWeightless(ControlledComponent.Owner.Transform.GridPosition))
+            {
+                return;
+            }
+
+            LinearVelocity *= Decay;
+
+            if (LinearVelocity.Length < 0.001)
+            {
+                Stop();
+            }
+        }
+    }
+}