moving some things around and code cleanup

2026-07-24 12:06:37 +00:00 · 2017-06-13 21:20:02 +10:00
parent c57417f055
commit b6555e8ce5
60 changed files with 82 additions and 206 deletions
@@ -0,0 +1,131 @@
+// Original code derived from: 
+// https://github.com/thelinuxlich/artemis_CSharp/blob/master/Artemis_XNA_INDEPENDENT/System/EntityProcessingSystem.cs
+
+// --------------------------------------------------------------------------------------------------------------------
+// <copyright file="EntityProcessingSystem.cs" company="GAMADU.COM">
+//     Copyright © 2013 GAMADU.COM. All rights reserved.
+//
+//     Redistribution and use in source and binary forms, with or without modification, are
+//     permitted provided that the following conditions are met:
+//
+//        1. Redistributions of source code must retain the above copyright notice, this list of
+//           conditions and the following disclaimer.
+//
+//        2. Redistributions in binary form must reproduce the above copyright notice, this list
+//           of conditions and the following disclaimer in the documentation and/or other materials
+//           provided with the distribution.
+//
+//     THIS SOFTWARE IS PROVIDED BY GAMADU.COM 'AS IS' AND ANY EXPRESS OR IMPLIED
+//     WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GAMADU.COM OR
+//     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+//     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+//     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+//     ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+//     NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+//     ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//     The views and conclusions contained in the software and documentation are those of the
+//     authors and should not be interpreted as representing official policies, either expressed
+//     or implied, of GAMADU.COM.
+// </copyright>
+// <summary>
+//   Class EntityProcessingSystem.
+// </summary>
+// --------------------------------------------------------------------------------------------------------------------
+
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+
+namespace MonoGame.Extended.Entities
+{
+    public abstract class EntityProcessingSystem : EntitySystem
+    {
+        protected EntityProcessingSystem()
+        {
+        }
+
+        private readonly Dictionary<Entity, int> _activeEntitiesLookup = new Dictionary<Entity, int>();
+
+        internal int Index;
+        internal Aspect Aspect;
+
+        private readonly List<Entity> _activeEntities = new List<Entity>();
+        public IReadOnlyCollection<Entity> ActiveEntities => _activeEntities;
+
+        internal virtual void RefreshEntityComponents(Entity entity)
+        {
+            var contains = entity.SystemBits[Index];
+            var isInterested = Aspect.Matches(entity.ComponentBits);
+
+            if (contains)
+                Remove(entity);
+            else if (isInterested)
+                Add(entity);
+        }
+
+        public virtual void OnEntityAdded(Entity entity) { }
+        public virtual void OnEntityDisabled(Entity entity) { }
+        public virtual void OnEntityEnabled(Entity entity) { }
+        public virtual void OnEntityRemoved(Entity entity) { }
+
+        protected override void Process(GameTime gameTime)
+        {
+            base.Process(gameTime);
+
+            for (var i = _activeEntities.Count - 1; i >= 0; i--)
+            {
+                var entity = _activeEntities[i];
+                Process(gameTime, entity);
+            }
+        }
+
+        protected virtual void Process(GameTime gameTime, Entity entity)
+        {
+        }
+
+        protected bool IsInterestedIn(Entity entity)
+        {
+            return Aspect.Matches(entity.ComponentBits);
+        }
+
+        internal void Add(Entity entity)
+        {
+            if (entity == null)
+                return;
+
+            entity.SystemBits[Index] = true;
+
+            if (_activeEntitiesLookup.ContainsKey(entity))
+                return;
+
+            _activeEntitiesLookup.Add(entity, _activeEntities.Count);
+            _activeEntities.Add(entity);
+
+            OnEntityAdded(entity);
+        }
+
+        internal void Remove(Entity entity)
+        {
+            if (entity == null)
+                return;
+
+            entity.SystemBits[Index] = false;
+
+            int activeEntityIndex;
+            if (!_activeEntitiesLookup.TryGetValue(entity, out activeEntityIndex))
+                return;
+            _activeEntitiesLookup.Remove(entity);
+
+            var swapEntity = _activeEntities[_activeEntities.Count - 1];
+
+            if (entity != swapEntity)
+                _activeEntitiesLookup[swapEntity] = activeEntityIndex;
+
+            _activeEntities[activeEntityIndex] = swapEntity;
+            _activeEntities.RemoveAt(_activeEntities.Count - 1);
+
+            OnEntityRemoved(entity);
+        }
+    }  
+}