refactoring the platformer to use the entity component system

2026-07-26 00:45:20 +00:00 · 2018-05-31 22:12:59 +10:00
parent 8cc2ce285e
commit 0ec192543d
13 changed files with 120 additions and 292 deletions
@@ -0,0 +1,56 @@
+using Microsoft.Xna.Framework;
+using MonoGame.Extended;
+using MonoGame.Extended.Entities;
+using Platformer.Collisions;
+
+namespace Platformer.Systems
+{
+    [Aspect(AspectType.All, typeof(Body))]
+    [EntitySystem(GameLoopType.Update, Layer = 0)]
+    public class WorldSystem : EntityProcessingSystem
+    {
+        private readonly World _world;
+
+        public WorldSystem()
+        {
+            _world = new World(new Vector2(0, 60)) {OnCollision = OnCollision};
+        }
+
+        public override void OnEntityAdded(Entity entity)
+        {
+            var body = entity.Get<Body>();
+            _world.Bodies.Add(body);
+        }
+
+        public override void OnEntityRemoved(Entity entity)
+        {
+            var body = entity.Get<Body>();
+            _world.Bodies.Remove(body);
+        }
+
+        protected override void Process(GameTime gameTime)
+        {
+            var elapsedSeconds = gameTime.GetElapsedSeconds();
+            _world.Update(elapsedSeconds);
+
+            base.Process(gameTime);
+        }
+
+        protected override void Process(GameTime gameTime, Entity entity)
+        {
+        }
+
+        private static void OnCollision(Manifold manifold)
+        {
+            var body = manifold.BodyB.BodyType == BodyType.Dynamic ? manifold.BodyB : manifold.BodyA;
+
+            body.Position -= manifold.Normal * manifold.Penetration;
+
+            if (manifold.Normal.Y < 0 || manifold.Normal.Y > 0)
+                body.Velocity.Y = 0;
+
+            //if (manifold.Normal.X < 0 || manifold.Normal.X > 0)
+            //    body.Velocity = new Vector2(0, body.Velocity.Y);
+        }
+    }
+}