Improves AirtightComponent.

- Atmos now nulls air in fully airblocked tiles ONLY if one of the airtight entities in it has NoAirWhenFullyAirBlocked to true.
- Fixes edge firelocks atmos airtight direction
- Fixes atmos debug overlay not accounting for angle 0 being south.

Content.Client/Atmos/AtmosDebugOverlay.cs

@@ -105,7 +105,8 @@ namespace Content.Client.Atmos
                                 {
                                     if (data.BlockDirection.HasFlag(dir))
                                     {
-                                        var atmosAngle = dir.ToAngle();
+                                        // Account for South being 0.
+                                        var atmosAngle = dir.ToAngle() - Angle.FromDegrees(90);
                                         var atmosAngleOfs = atmosAngle.ToVec() * 0.45f;
                                         var atmosAngleOfsR90 = new Vector2(atmosAngleOfs.Y, -atmosAngleOfs.X);
                                         var tileCentre = new Vector2(tile.X + 0.5f, tile.Y + 0.5f);
@@ -121,7 +122,8 @@ namespace Content.Client.Atmos
                                 // -- Pressure Direction --
                                 if (data.PressureDirection != AtmosDirection.Invalid)
                                 {
-                                    var atmosAngle = data.PressureDirection.ToAngle();
+                                    // Account for South being 0.
+                                    var atmosAngle = data.PressureDirection.ToAngle() - Angle.FromDegrees(90);
                                     var atmosAngleOfs = atmosAngle.ToVec() * 0.4f;
                                     var tileCentre = new Vector2(tile.X + 0.5f, tile.Y + 0.5f);
                                     var basisA = mapGrid.LocalToWorld(tileCentre);

Content.Server/GameObjects/Components/Atmos/AirtightComponent.cs

@@ -39,6 +39,10 @@ namespace Content.Server.GameObjects.Components.Atmos
         [DataField("fixAirBlockedDirectionInitialize")]
         private bool _fixAirBlockedDirectionInitialize = true;
 
+        [ViewVariables]
+        [field: DataField("noAirWhenFullyAirBlocked")]
+        public bool NoAirWhenFullyAirBlocked { get; } = true;
+
         [ViewVariables(VVAccess.ReadWrite)]
         public bool AirBlocked
         {
@@ -78,7 +82,7 @@ namespace Content.Server.GameObjects.Components.Atmos
             Owner.EnsureComponentWarn(out SnapGridComponent _);
 
             if (_fixAirBlockedDirectionInitialize)
-                RotateEvent(new RotateEvent(Owner, Angle.Zero, Owner.Transform.LocalRotation));
+                RotateEvent(new RotateEvent(Owner, Angle.Zero, Owner.Transform.WorldRotation));
 
             UpdatePosition();
         }

Content.Server/GameObjects/Components/Atmos/GridAtmosphereComponent.cs

@@ -288,6 +288,18 @@ namespace Content.Server.GameObjects.Components.Atmos
 
                 } else if (isAirBlocked)
                 {
+                    var nullAir = false;
+
+                    foreach (var airtight in GetObstructingComponents(indices))
+                    {
+                        if (airtight.NoAirWhenFullyAirBlocked)
+                        {
+                            nullAir = true;
+                            break;
+                        }
+                    }
+
+                    if(nullAir)
                         tile.Air = null;
                 }
                 else

Content.Shared/Atmos/AtmosDirection.cs

@@ -90,12 +90,12 @@ namespace Content.Shared.Atmos
             {
                 AtmosDirection.East => Angle.FromDegrees(90),
                 AtmosDirection.North => Angle.FromDegrees(180),
-                AtmosDirection.West => Angle.FromDegrees(-90),
+                AtmosDirection.West => Angle.FromDegrees(270),
                 AtmosDirection.South => Angle.FromDegrees(0),
 
                 AtmosDirection.NorthEast => Angle.FromDegrees(135),
-                AtmosDirection.NorthWest => Angle.FromDegrees(-135),
+                AtmosDirection.NorthWest => Angle.FromDegrees(205),
-                AtmosDirection.SouthWest => Angle.FromDegrees(-45),
+                AtmosDirection.SouthWest => Angle.FromDegrees(315),
                 AtmosDirection.SouthEast => Angle.FromDegrees(45),
 
                 _ => throw new ArgumentOutOfRangeException(nameof(direction), $"It was {direction}."),

Resources/Changelog/Parts/edge_firelocks.yml

@@ -0,0 +1,4 @@
+author: Zumorica
+changes:
+  - type: Fix
+    message: Having four edge firelocks in a single tile no longer destroys any air within it.

Resources/Prototypes/Entities/Constructible/Doors/firelock.yml

@@ -53,6 +53,7 @@
       openTimeTwo: 0.6
       startOpen: true
       bumpOpen: false
+      inhibitCrush: false
     - type: Firelock
     - type: Appearance
       visuals:
@@ -88,6 +89,7 @@
   components:
     - type: Door
       occludes: false
+      inhibitCrush: false
     - type: Occluder
       enabled: false
     - type: Sprite
@@ -100,13 +102,14 @@
   components:
     - type: Door
       occludes: false
-      inhibitCrush: true
+      inhibitCrush: false
     - type: Sprite
       sprite: Constructible/Structures/Doors/edge_door_hazard.rsi
     - type: Airtight
       fixVacuum: true
+      noAirWhenFullyAirBlocked: false
       airBlockedDirection:
-        - East
+        - South
     - type: Physics
       fixtures:
       - shape: