Construction System. (#87)

* Construction WiP

* Construction kinda works!

* Lots more construction work.

* It mostly works!

Content.Client/Construction/ConstructionPlacementHijack.cs

@@ -0,0 +1,62 @@
+using Content.Client.GameObjects.Components.Construction;
+using Content.Shared.Construction;
+using SS14.Client.Graphics;
+using SS14.Client.Interfaces.ResourceManagement;
+using SS14.Client.Placement;
+using SS14.Client.ResourceManagement;
+using SS14.Client.Utility;
+using SS14.Shared.Interfaces.GameObjects;
+using SS14.Shared.IoC;
+using SS14.Shared.Map;
+using SS14.Shared.Maths;
+
+namespace Content.Client.Construction
+{
+    public class ConstructionPlacementHijack : PlacementHijack
+    {
+        private readonly ConstructionPrototype Prototype;
+        private readonly ConstructorComponent Owner;
+
+        public ConstructionPlacementHijack(ConstructionPrototype prototype, ConstructorComponent owner)
+        {
+            Prototype = prototype;
+            Owner = owner;
+        }
+
+        public override bool HijackPlacementRequest(GridLocalCoordinates coords)
+        {
+            if (Prototype != null)
+            {
+                // Stupid god damn Y AXIS.
+                var dir = Manager.Direction;
+                if (dir == Direction.South)
+                {
+                    dir = Direction.North;
+                }
+                else if (dir == Direction.North)
+                {
+                    dir = Direction.South;
+                }
+                Owner.SpawnGhost(Prototype, coords, dir);
+            }
+            return true;
+        }
+
+        public override bool HijackDeletion(IEntity entity)
+        {
+            if (entity.TryGetComponent(out ConstructionGhostComponent ghost))
+            {
+                Owner.ClearGhost(ghost.GhostID);
+            }
+            return true;
+        }
+
+        public override void StartHijack(PlacementManager manager)
+        {
+            base.StartHijack(manager);
+
+            var res = IoCManager.Resolve<IResourceCache>();
+            manager.CurrentBaseSprite = Prototype.Icon.DirFrame0();
+        }
+    }
+}