- add: TelescopeSystem. (#273)

Content.Shared/_White/Telescope/SharedTelescopeSystem.cs

@@ -0,0 +1,78 @@
+using System.Numerics;
+using Content.Shared.Camera;
+using Content.Shared.Hands;
+using Content.Shared.Hands.Components;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared._White.Telescope;
+
+public abstract class SharedTelescopeSystem : EntitySystem
+{
+    [Dependency] private readonly SharedEyeSystem _eye = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeAllEvent<EyeOffsetChangedEvent>(OnEyeOffsetChanged);
+        SubscribeLocalEvent<TelescopeComponent, GotUnequippedHandEvent>(OnUnequip);
+        SubscribeLocalEvent<TelescopeComponent, HandDeselectedEvent>(OnHandDeselected);
+        SubscribeLocalEvent<TelescopeComponent, ComponentShutdown>(OnShutdown);
+    }
+
+    private void OnShutdown(Entity<TelescopeComponent> ent, ref ComponentShutdown args)
+    {
+        if (!TryComp(ent.Comp.LastHoldingEntity, out EyeComponent? eye))
+            return;
+
+        SetOffset((ent.Comp.LastHoldingEntity.Value, eye), Vector2.Zero, ent);
+    }
+
+    private void OnHandDeselected(Entity<TelescopeComponent> ent, ref HandDeselectedEvent args)
+    {
+        if (!TryComp(args.User, out EyeComponent? eye))
+            return;
+
+        SetOffset((args.User, eye), Vector2.Zero, ent);
+    }
+
+    private void OnUnequip(Entity<TelescopeComponent> ent, ref GotUnequippedHandEvent args)
+    {
+        if (!TryComp(args.User, out EyeComponent? eye))
+            return;
+
+        SetOffset((args.User, eye), Vector2.Zero, ent);
+    }
+
+    private void OnEyeOffsetChanged(EyeOffsetChangedEvent msg, EntitySessionEventArgs args)
+    {
+        if (args.SenderSession.AttachedEntity is not { } ent)
+            return;
+
+        if (!TryComp<HandsComponent>(ent, out var hands) ||
+            !TryComp<TelescopeComponent>(hands.ActiveHandEntity, out var telescope) ||
+            !TryComp(ent, out EyeComponent? eye))
+            return;
+
+        SetOffset((ent, eye), msg.Offset, telescope);
+    }
+
+    private void SetOffset(Entity<EyeComponent> ent, Vector2 offset, TelescopeComponent telescope)
+    {
+        telescope.LastHoldingEntity = ent;
+
+        if (TryComp(ent, out CameraRecoilComponent? recoil))
+        {
+            recoil.BaseOffset = offset;
+            _eye.SetOffset(ent, offset + recoil.CurrentKick, ent);
+        }
+        else
+            _eye.SetOffset(ent, offset, ent);
+    }
+}
+
+[Serializable, NetSerializable]
+public sealed class EyeOffsetChangedEvent : EntityEventArgs
+{
+    public Vector2 Offset;
+}

Content.Shared/_White/Telescope/TelescopeComponent.cs

@@ -0,0 +1,19 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared._White.Telescope;
+
+[RegisterComponent, NetworkedComponent]
+public sealed partial class TelescopeComponent : Component
+{
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float MaxLength = 670f;
+
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float MinLength = 100f;
+
+    [DataField, ViewVariables(VVAccess.ReadWrite)]
+    public float Divisor = 60f;
+
+    [ViewVariables]
+    public EntityUid? LastHoldingEntity;
+}