From 5512696a0440751685d532eacec7af0ec4fc0332 Mon Sep 17 00:00:00 2001
From: Syntriax <Syntriax@gmail.com>
Date: Mon, 27 Nov 2023 17:33:05 +0300
Subject: [PATCH] feat: Basic Play Area

---
 Game/Behaviours/MovementBallBehaviour.cs | 29 ++++++++++++++++++++++--
 Game/Behaviours/PlayAreaBehaviour.cs     | 26 +++++++++++++++++++++
 Game/Game.csproj                         |  1 +
 Game/Game1.cs                            |  6 ++++-
 4 files changed, 59 insertions(+), 3 deletions(-)
 create mode 100644 Game/Behaviours/PlayAreaBehaviour.cs

diff --git a/Game/Behaviours/MovementBallBehaviour.cs b/Game/Behaviours/MovementBallBehaviour.cs
index dd75ac1..b7cd436 100644
--- a/Game/Behaviours/MovementBallBehaviour.cs
+++ b/Game/Behaviours/MovementBallBehaviour.cs
@@ -6,9 +6,10 @@ using Syntriax.Engine.Input;
 
 namespace Pong.Behaviours;
 
-public class MovementBallBehaviour(Vector2 StartDirection, float Speed) : BehaviourOverride
+public class MovementBallBehaviour(Vector2 StartDirection, PlayAreaBehaviour PlayAreaBehaviour, float Speed) : BehaviourOverride
 {
-    public Vector2 StartDirection { get; } = StartDirection;
+    public Vector2 StartDirection { get; private set; } = StartDirection;
+    public PlayAreaBehaviour PlayAreaBehaviour { get; } = PlayAreaBehaviour;
     public float Speed { get; set; } = Speed;
 
     protected override void OnInitialize() => StartDirection.Normalize();
@@ -16,5 +17,29 @@ public class MovementBallBehaviour(Vector2 StartDirection, float Speed) : Behavi
     protected override void OnUpdate(GameTime time)
     {
         GameObject.Transform.Position += StartDirection * (time.ElapsedGameTime.Nanoseconds * .001f) * Speed;
+
+        float absY = MathF.Abs(GameObject.Transform.Position.Y);
+        float differenceY = absY - PlayAreaBehaviour.PlayArea.Y * 0.5f;
+        if (differenceY > 0f)
+        {
+            if (GameObject.Transform.Position.Y > 0f)
+                GameObject.Transform.Position -= Vector2.UnitY * differenceY * 2f;
+            else
+                GameObject.Transform.Position += Vector2.UnitY * differenceY * 2f;
+
+            StartDirection = new(StartDirection.X, -StartDirection.Y);
+        }
+
+        float absX = MathF.Abs(GameObject.Transform.Position.X);
+        float differenceX = absX - PlayAreaBehaviour.PlayArea.X * 0.5f;
+        if (differenceX > 0f)
+        {
+            if (GameObject.Transform.Position.X > 0f)
+                GameObject.Transform.Position -= Vector2.UnitX * differenceX * 2f;
+            else
+                GameObject.Transform.Position += Vector2.UnitX * differenceX * 2f;
+
+            StartDirection = new(-StartDirection.X, StartDirection.Y);
+        }
     }
 }
diff --git a/Game/Behaviours/PlayAreaBehaviour.cs b/Game/Behaviours/PlayAreaBehaviour.cs
new file mode 100644
index 0000000..0b0765e
--- /dev/null
+++ b/Game/Behaviours/PlayAreaBehaviour.cs
@@ -0,0 +1,26 @@
+using System;
+using Microsoft.Xna.Framework;
+using Syntriax.Engine.Core;
+
+namespace Pong.Behaviours;
+
+public class PlayAreaBehaviour : BehaviourOverride
+{
+    public Action<PlayAreaBehaviour>? OnPlayAreaChanged { get; set; } = null;
+
+    private Vector2 _playArea = Vector2.Zero;
+
+    public Vector2 PlayArea
+    {
+        get => _playArea;
+        set
+        {
+            if (_playArea == value)
+                return;
+
+            _playArea = value;
+            OnPlayAreaChanged?.Invoke(this);
+        }
+    }
+
+}
diff --git a/Game/Game.csproj b/Game/Game.csproj
index 4117ad7..9b23577 100644
--- a/Game/Game.csproj
+++ b/Game/Game.csproj
@@ -5,6 +5,7 @@
     <RollForward>Major</RollForward>
     <PublishReadyToRun>false</PublishReadyToRun>
     <TieredCompilation>false</TieredCompilation>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
   <PropertyGroup>
     <ApplicationManifest>app.manifest</ApplicationManifest>
diff --git a/Game/Game1.cs b/Game/Game1.cs
index 6c110ce..ece01ab 100644
--- a/Game/Game1.cs
+++ b/Game/Game1.cs
@@ -51,11 +51,15 @@ public class Game1 : Game
         gameManager.Camera = gameObjectCamera.BehaviourController.AddBehaviour<CameraBehaviour>();
         gameManager.Camera.Viewport = GraphicsDevice.Viewport;
 
+        IGameObject gameObjectPlayArea = gameManager.InstantiateGameObject<GameObject>();
+        PlayAreaBehaviour playAreaBehaviour = gameObjectPlayArea.BehaviourController.AddBehaviour<PlayAreaBehaviour>();
+        playAreaBehaviour.PlayArea = new Vector2(_graphics.PreferredBackBufferWidth, _graphics.PreferredBackBufferHeight);
+
         IGameObject gameObjectBall = gameManager.InstantiateGameObject<GameObject>();
         gameObjectBall.Name = "Ball";
         gameObjectBall.Transform.Position = Vector2.Zero;
         gameObjectBall.Transform.Scale = new Vector2(1f / 51.2f, 1f / 51.2f);
-        // gameObjectBall.BehaviourController.AddBehaviour<MovementBallBehaviour>(new Vector2(.1f, .1f), 100f);
+        gameObjectBall.BehaviourController.AddBehaviour<MovementBallBehaviour>(new Vector2(.1f, .1f), playAreaBehaviour, 100f);
         gameObjectBall.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBall);
 
         IGameObject gameObjectLeft = gameManager.InstantiateGameObject<GameObject>();