Add ability to burn papers +Flammable tweaks. (#18955)

Content.Server/Atmos/Components/FlammableComponent.cs

@@ -35,5 +35,26 @@ namespace Content.Server.Atmos.Components
         /// </summary>
         [DataField("flammableCollisionShape")]
         public IPhysShape FlammableCollisionShape = new PhysShapeCircle(0.35f);
+
+        /// <summary>
+        ///     Should the component be set on fire by interactions with isHot entities
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("alwaysCombustible")]
+        public bool AlwaysCombustible = false;
+
+        /// <summary>
+        ///     Can the component anyhow lose its FireStacks?
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("canExtinguish")]
+        public bool CanExtinguish = true;
+
+        /// <summary>
+        ///     How many firestacks should be applied to component when being set on fire?
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        [DataField("firestacksOnIgnite")]
+        public float FirestacksOnIgnite = 2.0f;
     }
 }

Content.Server/Atmos/EntitySystems/FlammableSystem.cs

@@ -147,18 +147,33 @@ namespace Content.Server.Atmos.EntitySystems
             if (flammable.OnFire)
             {
                 if (otherFlammable.OnFire)
+                {
+                    if (flammable.CanExtinguish)
                     {
                         var fireSplit = (flammable.FireStacks + otherFlammable.FireStacks) / 2;
                         flammable.FireStacks = fireSplit;
                         otherFlammable.FireStacks = fireSplit;
                     }
                     else
+                    {
+                        otherFlammable.FireStacks = flammable.FireStacks / 2;
+                    }
+                }
+                else
+                {
+                    if (!flammable.CanExtinguish)
+                    {
+                        otherFlammable.FireStacks += flammable.FireStacks / 2;
+                        Ignite(otherUid, uid, otherFlammable);
+                    }
+                    else
                     {
                         flammable.FireStacks /= 2;
                         otherFlammable.FireStacks += flammable.FireStacks;
                         Ignite(otherUid, uid, otherFlammable);
                     }
                 }
+            }
             else if (otherFlammable.OnFire)
             {
                 otherFlammable.FireStacks /= 2;
@@ -215,7 +230,7 @@ namespace Content.Server.Atmos.EntitySystems
             if (!Resolve(uid, ref flammable))
                 return;
 
-            if (!flammable.OnFire)
+            if (!flammable.OnFire || !flammable.CanExtinguish)
                 return;
 
             _adminLogger.Add(LogType.Flammable, $"{ToPrettyString(flammable.Owner):entity} stopped being on fire damage");
@@ -233,6 +248,11 @@ namespace Content.Server.Atmos.EntitySystems
             if (!Resolve(uid, ref flammable))
                 return;
 
+            if (flammable.AlwaysCombustible)
+            {
+                flammable.FireStacks = Math.Max(flammable.FirestacksOnIgnite, flammable.FireStacks);
+            }
+
             if (flammable.FireStacks > 0 && !flammable.OnFire)
             {
                 if (ignitionSourceUser != null)

Resources/Prototypes/Entities/Objects/Misc/paper.yml

@@ -30,6 +30,32 @@
     - Trash
   - type: Appearance
   - type: PaperVisuals
+  - type: Flammable
+    fireSpread: true
+    canResistFire: false
+    alwaysCombustible: true
+    canExtinguish: false # Mwahaha! Let the world burn because of one piece of paper!
+    damage:
+      types:
+        Heat: 1
+  - type: FireVisuals
+    sprite: Effects/fire.rsi
+    normalState: fire
+  - type: Damageable
+    damageModifierSet: Wood
+  - type: Destructible
+    thresholds:
+    - trigger:
+        !type:DamageTrigger
+        damage: 15
+      behaviors:
+      - !type:SpawnEntitiesBehavior
+        spawn:
+            Ash:
+              min: 1
+              max: 1
+      - !type:DoActsBehavior
+        acts: [ "Destruction" ]
 
 - type: entity
   name: office paper