station 46 room

Assets/Engine/Runtime/Requirements/Placement/PlaceOnBottomOrTopRowAlternating.cs

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+using System.Collections.Generic;
+using EscapeRoomEngine.Engine.Runtime.Modules;
+using EscapeRoomEngine.Engine.Runtime.Modules.State;
+using EscapeRoomEngine.Engine.Runtime.Utilities;
+using UnityEngine;
+
+namespace EscapeRoomEngine.Engine.Runtime.Requirements.Placement
+{
+    /// <summary>
+    /// This requirement guarantees that the back side of the module is placed on the bottom row of an even-numbered space or on the top row of an odd-numbered space.
+    /// </summary>
+    [CreateAssetMenu(menuName = "Requirements/Place On Bottom Or Top Row Alternating")]
+    public class PlaceOnBottomOrTopRowAlternating : PlacementRequirement
+    {
+        protected override List<Utilities.Placement> FilterCandidates(List<Utilities.Placement> candidates, Module module, Space space)
+        {
+            if (!module.description.HasType(ModuleType.DoorExit))
+            {
+                throw new WrongTypeException(module.description.types[0], ModuleType.DoorExit);
+            }
+            
+            var number = FindObjectsByType<DoorState>(FindObjectsInactive.Include, FindObjectsSortMode.None).Length;
+            
+            if (number / 2 % 2 == 0)
+            {
+                candidates.RemoveAll(candidate =>
+                {
+                    var (left, right) = candidate.BackCorners;
+                    return !(left.z == 0 && right.z == 0);
+                });
+            }
+            else
+            {
+                var sizeMinusOne = space.rrPlacement.size - Vector2Int.one;
+                
+                candidates.RemoveAll(candidate =>
+                {
+                    var (left, right) = candidate.BackCorners;
+                    return !(left.z == sizeMinusOne.y && right.z == sizeMinusOne.y);
+                });
+            }
+
+            return candidates;
+        }
+    }
+}