testing filter

lib/MoonTools.ECS

@@ -1 +1 @@
-Subproject commit 229a0651bdaac5918b4550866cdca9122bf0d78b
+Subproject commit 1d7db58d437ce370a31e2ae11a17350cec2089f7

src/InputSystem.cs

@@ -7,7 +7,7 @@ namespace MoonWorksECSTest
 	{
 		MoonWorks.Input.Inputs Inputs;
 
-		public InputSystem(MoonWorks.Input.Inputs inputs)
+		public InputSystem(World world, MoonWorks.Input.Inputs inputs) : base(world)
 		{
 			Inputs = inputs;
 		}

src/MoonWorksECSTestGame.cs

@@ -6,7 +6,7 @@ namespace MoonWorksECSTest
 {
     class MoonWorksECSTestGame : Game
     {
-		World world;
+		World world = new World();
 
         public MoonWorksECSTestGame(
             WindowCreateInfo windowCreateInfo,
@@ -14,14 +14,11 @@ namespace MoonWorksECSTest
             bool debugMode
         ) : base(windowCreateInfo, presentMode, 60, debugMode)
         {
-			var worldBuilder = new WorldBuilder();
-			worldBuilder.AddSystem(new InputSystem(Inputs));
-			worldBuilder.AddSystem(new PositionSystem());
+			new InputSystem(world, Inputs);
+			new PositionSystem(world);
 
-			var entity = worldBuilder.CreateEntity();
-			worldBuilder.Set(entity, new PositionComponent { Position = new MoonWorks.Math.Vector2(200, 200) });
-
-			world = worldBuilder.Build();
+			var entity = world.CreateEntity();
+			world.Set(entity, new PositionComponent { Position = new MoonWorks.Math.Vector2(200, 200) });
         }
 
         protected override void Update(System.TimeSpan dt)

src/PositionSystem.cs

@@ -5,9 +5,16 @@ namespace MoonWorksECSTest
 {
 	public class PositionSystem : MoonTools.ECS.System
 	{
+		Filter PositionFilter;
+
+		public PositionSystem(World world) : base(world)
+		{
+			PositionFilter = FilterBuilder.Include<PositionComponent>().Build();
+		}
+
 		public override void Update(TimeSpan delta)
 		{
-			foreach (var entity in ReadEntities<PositionComponent>())
+			foreach (var entity in PositionFilter.Entities)
 			{
 				foreach (var inputMessage in ReadMessages<InputMessage>())
 				{