ChemicalInjectionProjectileComponent (#2657)

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Client/IgnoredComponents.cs

@@ -217,6 +217,7 @@
             "ConveyorAssembly",
             "TwoWayLever",
             "FirelockElectronics",
+            "ChemicalInjectionProjectile",
             "Machine",
             "MachinePart",
             "MachineFrame",

Content.Server/GameObjects/Components/Projectiles/ChemicalInjectionProjectileComponent.cs

@@ -0,0 +1,55 @@
+using Content.Server.GameObjects.Components.Body.Circulatory;
+using Content.Server.GameObjects.Components.Chemistry;
+using Content.Shared.Chemistry;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+using System;
+
+namespace Content.Server.GameObjects.Components.Projectiles
+{
+    [RegisterComponent]
+    public class ChemicalInjectionProjectileComponent : Component, ICollideBehavior
+    {
+        public override string Name => "ChemicalInjectionProjectile";
+
+        [ViewVariables]
+        private SolutionContainerComponent _solutionContainer;
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public ReagentUnit TransferAmount { get; set; }
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float TransferEfficiency { get => _transferEfficiency; set => _transferEfficiency = Math.Clamp(value, 0, 1); }
+        private float _transferEfficiency;
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+            serializer.DataField(this, x => x.TransferAmount, "transferAmount", ReagentUnit.New(1));
+            serializer.DataField(ref _transferEfficiency, "transferEfficiency", 1f);
+        }
+
+        public override void Initialize()
+        {
+            base.Initialize();
+            _solutionContainer = Owner.EnsureComponent<SolutionContainerComponent>();
+        }
+
+        void ICollideBehavior.CollideWith(IEntity entity)
+        {
+            if (!entity.TryGetComponent<BloodstreamComponent>(out var bloodstream))
+                return;
+
+            var solution = _solutionContainer.Solution;
+            var solRemoved = solution.SplitSolution(TransferAmount);
+            var solRemovedVol = solRemoved.TotalVolume;
+
+            var solToInject = solRemoved.SplitSolution(solRemovedVol * TransferEfficiency);
+
+            bloodstream.TryTransferSolution(solToInject);
+        }
+    }
+}

Resources/Prototypes/Entities/Objects/Weapons/Guns/Ammunition/Shotgun/cartridges.yml

@@ -1,4 +1,4 @@
-- type: entity
+- type: entity
   id: ShellShotgunBase
   name: shell (.50)
   parent: BaseItem
@@ -87,3 +87,15 @@
   - type: Ammo
     projectile: PelletShotgun
     projectilesFired: 6
+
+- type: entity
+  id: ShellTranquilizer
+  name: shell (.50 tranquilizer)
+  parent: ShellShotgunBase
+  components:
+  - type: Sprite
+    sprite: Objects/Weapons/Guns/Ammunition/Casings/shotgun_shell_practice.rsi
+  - type: Ammo
+    projectile: PelletShotgunTranquilizer
+    projectilesFired: 1
+    ammoSpread: 0

Resources/Prototypes/Entities/Objects/Weapons/Guns/Ammunition/Shotgun/projectiles.yml

@@ -1,4 +1,4 @@
-- type: entity
+- type: entity
   id: PelletShotgunSlug
   name: pellet (.50 slug)
   abstract: true
@@ -76,3 +76,24 @@
   - type: Projectile
     damages:
       Blunt: 1
+
+- type: entity
+  id: PelletShotgunTranquilizer
+  name: pellet (.50 tranquilizer)
+  abstract: true
+  parent: BulletBasePractice
+  components:
+  - type: Sprite
+    sprite: Objects/Weapons/Guns/Projectiles/buckshot.rsi
+    state: base
+  - type: Projectile
+    damages:
+      Blunt: 1
+  - type: SolutionContainer
+    maxVol: 10
+    contents:
+      reagents:
+      - ReagentId: chem.H2O
+        Quantity: 10
+    caps: RemoveFrom
+  - type: ChemicalInjectionProjectile