Engine-Pong/Game/Game1.cs

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

using Pong.Behaviours;

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

namespace Pong;

public class Game1 : Game
{
    private GraphicsDeviceManager _graphics = null!;
    private PhysicsEngine2D engine;
    private SpriteBatch _spriteBatch = null!;
    public static GameManager gameManager = null!;
    public static Sprite spriteBox = null!;
    private MonoGameCameraBehaviour cameraBehaviour = null!;


    public Game1()
    {
        engine = new PhysicsEngine2D();

        _graphics = new GraphicsDeviceManager(this)
        {
            PreferredBackBufferWidth = 1024,
            PreferredBackBufferHeight = 576
        };

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

    protected override void Initialize()
    {
        gameManager = new();

        // TODO: Add your initialization logic here
        gameManager.Initialize();

        base.Initialize();
    }

    protected override void LoadContent()
    {
        _spriteBatch = new SpriteBatch(GraphicsDevice);

        spriteBox = new Sprite() { Texture2D = Content.Load<Texture2D>("Sprites/Pixel") };
        Sprite spriteBall = new Sprite() { Texture2D = Content.Load<Texture2D>("Sprites/Circle") };

        IGameObject gameObjectCamera = gameManager.InstantiateGameObject<GameObject>();
        gameObjectCamera.Name = "Camera";
        gameObjectCamera.Transform.Position = Vector2D.Zero;

        cameraBehaviour = gameObjectCamera.BehaviourController.AddBehaviour<MonoGameCameraBehaviour>();
        cameraBehaviour.Viewport = GraphicsDevice.Viewport;
        gameManager.Camera = cameraBehaviour;

        GameObject gameObjectBall = gameManager.InstantiateGameObject<GameObject>();
        gameObjectBall.Name = "Ball";
        gameObjectBall.Transform.Position = Vector2D.Zero;
        gameObjectBall.Transform.Scale = new Vector2D(1f / 51.2f, 1f / 51.2f);
        engine.AddRigidBody(gameObjectBall.BehaviourController.AddBehaviour<RigidBody2D>());
        gameObjectBall.BehaviourController.AddBehaviour<MovementBallBehaviour>(new Vector2D(.1f, .1f), 500f);
        gameObjectBall.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBall);
        gameObjectBall.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * 512f * .5f, Vector2D.One * 512f * .5f);
        // gameObjectBall = gameManager.InstantiateGameObject<GameObject>();
        // gameObjectBall.Name = "Ball";
        // gameObjectBall.Transform.Position = Vector2D.UnitY * 30f;
        // gameObjectBall.Transform.Scale = new Vector2D(1f / 51.2f, 1f / 51.2f);
        // engine.AddRigidBody(gameObjectBall.BehaviourController.AddBehaviour<RigidBody2D>());
        // gameObjectBall.BehaviourController.AddBehaviour<MovementBallBehaviour>(new Vector2D(.1f, .01f), 500f);
        // gameObjectBall.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBall);
        // gameObjectBall.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * 512f * .5f, Vector2D.One * 512f * .5f);

        // IGameObject gameObjectLeft = gameManager.InstantiateGameObject<GameObject>();
        // gameObjectLeft.Name = "Left";
        // gameObjectLeft.Transform.Position = new Vector2D(-452, 0f);
        // gameObjectLeft.Transform.Scale = new Vector2D(10f, 40f);
        // gameObjectLeft.BehaviourController.AddBehaviour<KeyboardInputsBehaviour>();
        // gameObjectLeft.BehaviourController.AddBehaviour<MovementBoxBehaviour>(Keys.W, Keys.S, 268f, -268f, 400f);
        // gameObjectLeft.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // gameObjectLeft.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        // engine.AddRigidBody(gameObjectLeft.BehaviourController.AddBehaviour<RigidBody2D>());

        // IGameObject gameObjectRight = gameManager.InstantiateGameObject<GameObject>();
        // gameObjectRight.Name = "Right";
        // gameObjectRight.Transform.Position = new Vector2D(452, 0f);
        // gameObjectRight.Transform.Scale = new Vector2D(10f, 40f);
        // gameObjectRight.BehaviourController.AddBehaviour<KeyboardInputsBehaviour>();
        // gameObjectRight.BehaviourController.AddBehaviour<MovementBoxBehaviour>(Keys.Up, Keys.Down, 268f, -268f, 400f);
        // gameObjectRight.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // gameObjectRight.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        // engine.AddRigidBody(gameObjectRight.BehaviourController.AddBehaviour<RigidBody2D>());


        IGameObject goPlayAreaTop = gameManager.InstantiateGameObject<GameObject>();
        goPlayAreaTop.Transform.Position = new Vector2D(0f, 288f + 20f);
        goPlayAreaTop.Transform.Scale = new Vector2D(10240f, 40f);
        goPlayAreaTop.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // goPlayAreaTop.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        engine.AddRigidBody(goPlayAreaTop.BehaviourController.AddBehaviour<RigidBody2D>());
        IGameObject goPlayAreaBottom = gameManager.InstantiateGameObject<GameObject>();
        goPlayAreaBottom.Transform.Position = new Vector2D(0f, -(288f + 20f));
        goPlayAreaBottom.Transform.Scale = new Vector2D(10240f, 40f);
        goPlayAreaBottom.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // goPlayAreaBottom.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        engine.AddRigidBody(goPlayAreaBottom.BehaviourController.AddBehaviour<RigidBody2D>());

        IGameObject goPlayAreaRight = gameManager.InstantiateGameObject<GameObject>();
        goPlayAreaRight.Transform.Position = new Vector2D(512f + 20f, 0f);
        goPlayAreaRight.Transform.Scale = new Vector2D(40f, 5760f);
        goPlayAreaRight.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // goPlayAreaRight.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        engine.AddRigidBody(goPlayAreaRight.BehaviourController.AddBehaviour<RigidBody2D>());
        IGameObject goPlayAreaLeft = gameManager.InstantiateGameObject<GameObject>();
        goPlayAreaLeft.Transform.Position = new Vector2D(-(512f + 20f), 0f);
        goPlayAreaLeft.Transform.Scale = new Vector2D(40f, 5760f);
        goPlayAreaLeft.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // goPlayAreaLeft.BehaviourController.AddBehaviour<Collider2DAABBBehaviour>().AABBLocal = new AABB(-Vector2D.One * .5f, Vector2D.One * .5f);
        engine.AddRigidBody(goPlayAreaLeft.BehaviourController.AddBehaviour<RigidBody2D>());

        // IGameObject goPlayAreaCenter = gameManager.InstantiateGameObject<GameObject>();
        // goPlayAreaCenter.Transform.Position = new Vector2D(100f, 100f);
        // goPlayAreaCenter.Transform.Scale = new Vector2D(40f, 40f);
        // // goPlayAreaCenter.BehaviourController.AddBehaviour<DisplayableSpriteBehaviour>().Assign(spriteBox);
        // engine.AddRigidBody(goPlayAreaCenter.BehaviourController.AddBehaviour<RigidBody2D>());
        // TODO: use this.Content to load your game content here
    }

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

        if (Keyboard.GetState().IsKeyDown(Keys.F))
        {
            if (_graphics.IsFullScreen)
                return;

            _graphics.PreferMultiSampling = false;
            _graphics.PreferredBackBufferWidth = GraphicsDevice.Adapter.CurrentDisplayMode.Width;
            _graphics.PreferredBackBufferHeight = GraphicsDevice.Adapter.CurrentDisplayMode.Height;
            _graphics.IsFullScreen = true;
            _graphics.ApplyChanges();

            float previousScreenSize = MathF.Sqrt(MathF.Pow(cameraBehaviour.Viewport.Width, 2f) + MathF.Pow(cameraBehaviour.Viewport.Height, 2f));
            float currentScreenSize = MathF.Sqrt(MathF.Pow(GraphicsDevice.Viewport.Width, 2f) + MathF.Pow(GraphicsDevice.Viewport.Height, 2f));
            cameraBehaviour.Zoom /= previousScreenSize / currentScreenSize;
            cameraBehaviour.Viewport = GraphicsDevice.Viewport;
        }

        if (Keyboard.GetState().IsKeyDown(Keys.U))
            cameraBehaviour.Zoom += gameTime.ElapsedGameTime.Nanoseconds * 0.00025f;
        if (Keyboard.GetState().IsKeyDown(Keys.J))
            cameraBehaviour.Zoom -= gameTime.ElapsedGameTime.Nanoseconds * 0.00025f;

        if (Keyboard.GetState().IsKeyDown(Keys.Q))
            cameraBehaviour.BehaviourController.GameObject.Transform.Rotation += gameTime.ElapsedGameTime.Nanoseconds * 0.000025f;
        if (Keyboard.GetState().IsKeyDown(Keys.E))
            cameraBehaviour.BehaviourController.GameObject.Transform.Rotation -= gameTime.ElapsedGameTime.Nanoseconds * 0.000025f;

        if (Keyboard.GetState().IsKeyDown(Keys.N))
        {
            seconds = 70f;
            while (physicsTimer + 0.01f < seconds)
            {
                physicsTimer += 0.01f;
                engine.Step(.01f);
            }
        }
        if (Keyboard.GetState().IsKeyDown(Keys.M))
        {
            seconds = 0f;
            while (physicsTimer - 0.01f > seconds)
            {
                physicsTimer -= 0.01f;
                engine.Step(-.01f);
            }
        }
        if (Keyboard.GetState().IsKeyDown(Keys.Space))
        {
            seconds += gameTime.ElapsedGameTime.Milliseconds * .005f;
            while (physicsTimer + 0.01f < seconds)
            {
                Console.WriteLine($"Physics Timer: {physicsTimer}");
                physicsTimer += 0.01f;
                engine.Step(.01f);
            }
        }
        if (Keyboard.GetState().IsKeyDown(Keys.B))
        {
            seconds -= gameTime.ElapsedGameTime.Milliseconds * .005f;
            while (physicsTimer - 0.01f > seconds)
            {
                Console.WriteLine($"Physics Timer: {physicsTimer}");
                physicsTimer -= 0.01f;
                engine.Step(-.01f);
            }
        }


        // while (physicsTimer + 0.01f < gameTime.TotalGameTime.TotalMilliseconds * .001f)//seconds)
        // {
        //     Console.WriteLine($"Physics Timer: {physicsTimer}");
        //     physicsTimer += 0.01f;
        //     engine.Step(.01f);
        // }
        gameManager.Update(gameTime.ToEngineTime());
        base.Update(gameTime);
    }
    static float physicsTimer = 0f;
    static float seconds = 0f;

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

        // gameManager.Camera.Position = gameObjectBall.Transform.Position;
        // Console.WriteLine($"Pos: {gameManager.Camera.Position}");

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

        _spriteBatch.Begin(SpriteSortMode.Deferred, transformMatrix: cameraBehaviour.MatrixTransform);
        foreach (IGameObject gameObject in gameManager)
        {
            if (!gameObject.BehaviourController.TryGetBehaviour(out IDisplayable? displayable))
                continue;

            displayable.Draw(_spriteBatch);
        }
        _spriteBatch.End();

        base.Draw(gameTime);
    }
}