Engine-Pong/Game/GamePong.cs

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

using Pong.Behaviours;
using Apos.Shapes;

using Syntriax.Engine.Core;
using Syntriax.Engine.Core.Abstract;
using Syntriax.Engine.Physics2D;
using Syntriax.Engine.Physics2D.Primitives;
using Syntriax.Engine.Physics2D.Abstract;

namespace Pong;

public class GamePong : Game
{
    private readonly GraphicsDeviceManager graphics = null!;
    private IPhysicsEngine2D physicsEngine = null!;
    private SpriteBatch spriteBatch = null!;
    private ShapeBatch shapeBatch = null!;

    private GameManager gameManager = null!;
    private BehaviourCacher<IDisplayableSprite> displayableCacher = null!;
    private BehaviourCacher<IDisplayableShape> displayableShapeCacher = null!;
    private MonoGameCamera2DBehaviour cameraBehaviour = null!;

    private PongManagerBehaviour pongManager = null!;

    private float physicsTimer = 0f;

    public GamePong()
    {
        graphics = new GraphicsDeviceManager(this)
        {
            PreferredBackBufferWidth = 1024,
            PreferredBackBufferHeight = 576,
            GraphicsProfile = GraphicsProfile.HiDef
        };

        Content.RootDirectory = "Content";
        IsMouseVisible = true;
    }

    protected override void Initialize()
    {
        // TODO: Add your initialization logic here
        gameManager = new();
        displayableCacher = new(gameManager);
        displayableShapeCacher = new(gameManager);
        physicsEngine = new PhysicsEngine2DCacher(gameManager) { IterationPerStep = 3 };

        gameManager.Initialize();

        base.Initialize();
    }

    protected override void LoadContent()
    {
        spriteBatch = new SpriteBatch(GraphicsDevice);
        shapeBatch = new ShapeBatch(GraphicsDevice, Content);
        SpriteFont spriteFont = Content.Load<SpriteFont>("UbuntuMono");

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectCamera = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Camera"); ;
        gameObjectCamera.BehaviourController.AddBehaviour<CameraController>();
        cameraBehaviour = gameObjectCamera.BehaviourController.AddBehaviour<MonoGameCamera2DBehaviour>(graphics);

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectPongManager = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Pong Game Manager");
        pongManager = gameObjectPongManager.BehaviourController.AddBehaviour<PongManagerBehaviour>(5);

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectBall = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Ball");
        gameObjectBall.Transform.SetTransform(position: new Vector2D(0, 0f), scale: new Vector2D(10f, 10f));

        gameObjectBall.BehaviourController.AddBehaviour<CircleBehaviour>(new Circle(Vector2D.Zero, 1f));
        gameObjectBall.BehaviourController.AddBehaviour<BallBehaviour>();
        gameObjectBall.BehaviourController.AddBehaviour<RigidBody2D>();

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectLeftPaddle = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Left Paddle");
        gameObjectLeftPaddle.Transform.SetTransform(position: new Vector2D(-468f, 0f), scale: new Vector2D(15f, 60f));

        gameObjectLeftPaddle.BehaviourController.AddBehaviour<PaddleBehaviour>(Keys.W, Keys.S, 228f, -228f, 400f);
        gameObjectLeftPaddle.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectLeftPaddle.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        IGameObject gameObjectRightPaddle = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Right Paddle");
        gameObjectRightPaddle.Transform.SetTransform(position: new Vector2D(468f, 0f), scale: new Vector2D(15f, 60f));
        gameObjectRightPaddle.BehaviourController.AddBehaviour<PaddleBehaviour>(Keys.Up, Keys.Down, 228f, -228f, 400f);
        gameObjectRightPaddle.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectRightPaddle.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectWallTop = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Wall Top");
        gameObjectWallTop.Transform.SetTransform(position: new Vector2D(0f, 308f), scale: new Vector2D(552f, 20f));
        gameObjectWallTop.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectWallTop.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        IGameObject gameObjectWallBottom = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Wall Bottom");
        gameObjectWallBottom.Transform.SetTransform(position: new Vector2D(0f, -308f), scale: new Vector2D(552f, 20f));
        gameObjectWallBottom.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectWallBottom.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        IGameObject gameObjectWallRight = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Wall Right");
        gameObjectWallRight.Transform.SetTransform(position: new Vector2D(532f, 0f), scale: new Vector2D(20f, 328f));
        gameObjectWallRight.BehaviourController.AddBehaviour<WallScoreBehaviour>((Action)pongManager.ScoreToLeft);
        gameObjectWallRight.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectWallRight.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        IGameObject gameObjectWallLeft = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Wall Left");
        gameObjectWallLeft.Transform.SetTransform(position: new Vector2D(-532f, 0f), scale: new Vector2D(20f, 328f));
        gameObjectWallLeft.BehaviourController.AddBehaviour<WallScoreBehaviour>((Action)pongManager.ScoreToRight);
        gameObjectWallLeft.BehaviourController.AddBehaviour<ShapeBehaviour>(Shape.Box);
        gameObjectWallLeft.BehaviourController.AddBehaviour<RigidBody2D>().IsStatic = true;

        ////////////////////////////////////////////////////////////////////////////////////

        IGameObject gameObjectLeftScoreText = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Score Left");
        gameObjectLeftScoreText.Transform.SetTransform(position: new Vector2D(-250f, 250f), scale: Vector2D.One * .25f);
        gameObjectLeftScoreText.BehaviourController.AddBehaviour<TextScoreBehaviour>(true, spriteFont);

        IGameObject gameObjectRightScoreText = gameManager.InstantiateGameObject<GameObject>().SetGameObject("Score Right");
        gameObjectRightScoreText.Transform.SetTransform(position: new Vector2D(250f, 250f), scale: Vector2D.One * .25f);
        gameObjectRightScoreText.BehaviourController.AddBehaviour<TextScoreBehaviour>(false, spriteFont);
    }

    protected override void Update(GameTime gameTime)
    {
        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
            Exit();

        gameManager.Update(gameTime.ToEngineTime());
        while (physicsTimer + 0.01f < gameTime.TotalGameTime.TotalMilliseconds * .001f)//seconds)
        {
            physicsTimer += 0.01f;
            physicsEngine.Step(.01f);
        }
        base.Update(gameTime);
    }

    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(new Color() { R = 32, G = 32, B = 32 });

        // TODO: Add your drawing code here
        gameManager.PreDraw();

        spriteBatch.Begin(SpriteSortMode.Deferred, transformMatrix: cameraBehaviour.MatrixTransform);
        foreach (var displayable in displayableCacher)
            displayable.Draw(spriteBatch);
        spriteBatch.End();

        shapeBatch.Begin(cameraBehaviour.MatrixTransform);
        foreach (var displayableShape in displayableShapeCacher)
            displayableShape.Draw(shapeBatch);
        shapeBatch.End();

        base.Draw(gameTime);
    }
}