Add API to remove blocks

GamecraftModdingAPI/Blocks/PlacementEngine.cs

@@ -113,8 +113,7 @@ namespace GamecraftModdingAPI.Blocks
             {
                 scaleFactor = placementScale.desiredScaleFactor
             });
-            structInitializer.Init(
-                new BlockPlacementInfoStruct()
+            structInitializer.Init(new BlockPlacementInfoStruct()
             {
                 loadedFromDisk = false,
                 placedBy = playerId

GamecraftModdingAPI/Blocks/Removal.cs

@@ -0,0 +1,28 @@
+using Svelto.ECS;
+
+using GamecraftModdingAPI.Utility;
+
+namespace GamecraftModdingAPI.Blocks
+{
+    public class Removal
+    {
+        private static RemovalEngine _removalEngine = new RemovalEngine();
+
+        /// <summary>
+        /// Removes the block with the given ID. Returns false if the block doesn't exist or the game isn't in build mode.
+        /// </summary>
+        /// <param name="targetBlock">The block to remove</param>
+        /// <returns>Whether the block was successfully removed</returns>
+        public static bool RemoveBlock(EGID targetBlock)
+        {
+            if (GameState.IsBuildMode())
+                return _removalEngine.RemoveBlock(targetBlock);
+            return false;
+        }
+
+        public static void Init()
+        {
+            GameEngineManager.AddGameEngine(_removalEngine);
+        }
+    }
+}

GamecraftModdingAPI/Blocks/RemovalEngine.cs

@@ -0,0 +1,94 @@
+using System.Reflection;
+
+using Harmony;
+using RobocraftX.Blocks;
+using RobocraftX.Blocks.Ghost;
+using RobocraftX.Character.Camera;
+using RobocraftX.Character.Factories;
+using RobocraftX.Common;
+using RobocraftX.Players;
+using Svelto.ECS;
+using uREPL;
+
+using GamecraftModdingAPI.Commands;
+using GamecraftModdingAPI.Utility;
+
+namespace GamecraftModdingAPI.Blocks
+{
+    public class RemovalEngine : IApiEngine
+    {
+        private static IEntityFunctions _entityFunctions;
+        private static MachineGraphConnectionEntityFactory _connectionFactory;
+
+        public bool RemoveBlock(EGID target)
+        {
+            if (!entitiesDB.Exists<MachineGraphConnectionsEntityStruct>(target))
+                return false;
+            var connections = entitiesDB.QueryEntity<MachineGraphConnectionsEntityStruct>(target);
+            for (int i = connections.connections.Length - 1; i >= 0; i--)
+                _connectionFactory.RemoveConnection(connections, i, entitiesDB);
+            _entityFunctions.RemoveEntity<BlockEntityDescriptor>(target);
+            return true;
+        }
+
+        /// <summary>
+        /// Returns the block the player is currently looking at.
+        /// </summary>
+        /// <param name="playerId">The player's ID</param>
+        /// <param name="maxDistance">The maximum distance from the player (default is the player's building reach)</param>
+        /// <returns>The block's EGID or null if not found</returns>
+        public EGID? GetBlockUnderCursor(uint playerId, float maxDistance = -1f)
+        {
+            if (!entitiesDB.TryQueryMappedEntities<CharacterCameraRayCastEntityStruct>(
+                CameraExclusiveGroups.CameraGroup, out var mapper))
+                return null;
+            mapper.TryGetEntity(playerId, out CharacterCameraRayCastEntityStruct rayCast);
+            float distance = maxDistance < 0
+                ? GhostBlockUtils.GetBuildInteractionDistance(entitiesDB, rayCast)
+                : maxDistance;
+            if (rayCast.hit && rayCast.distance <= distance)
+                return rayCast.hitEgid;
+            return null;
+        }
+
+        public void Ready()
+        {
+            CommandManager.AddCommand(new SimpleCustomCommandEngine(() =>
+            {
+                var block = GetBlockUnderCursor(LocalPlayerIDUtility.GetLocalPlayerID(entitiesDB));
+                if (block.HasValue)
+                {
+                    RemoveBlock(block.Value);
+                    Log.Output("Removed block.");
+                }
+                else
+                    Log.Output("No block found where you're looking at.");
+            }, "removeCube", "Removes the cube you're looking at."));
+        }
+
+        public EntitiesDB entitiesDB { get; set; }
+
+        public void Dispose()
+        {
+        }
+
+        public string Name { get; } = "GamecraftModdingAPIRemovalGameEngine";
+
+        [HarmonyPatch]
+        public class FactoryObtainerPatch
+        {
+            static void Postfix(IEntityFunctions entityFunctions,
+                MachineGraphConnectionEntityFactory machineGraphConnectionEntityFactory)
+            {
+                _entityFunctions = entityFunctions;
+                _connectionFactory = machineGraphConnectionEntityFactory;
+                Logging.MetaDebugLog("Requirements injected.");
+            }
+
+            static MethodBase TargetMethod(HarmonyInstance instance)
+            {
+                return AccessTools.TypeByName("RobocraftX.CR.MachineEditing.RemoveBlockEngine").GetConstructors()[0];
+            }
+        }
+    }
+}

GamecraftModdingAPI/Blocks/RotationEngine.cs

@@ -44,7 +44,7 @@ namespace GamecraftModdingAPI.Blocks
             IsInGame = true;
         }
 
-        // implementations for Movement static class
+        // implementations for Rotation static class
 
         public float3 RotateBlock(uint blockID, Vector3 vector)
         {

GamecraftModdingAPI/Main.cs

@@ -65,6 +65,7 @@ namespace GamecraftModdingAPI
             Blocks.Signals.Init();
             Blocks.Placement.Init();
 			Blocks.Tweakable.Init();
+            Blocks.Removal.Init();
 			// init inventory
 			Inventory.Hotbar.Init();
 			// init input