tunnet/Game1.cs

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

using MonoGameLibrary;
using MonoGameLibrary.Graphics;

// using tunnet.World;

namespace tunnet;

public class Game1 : Core
{
    // private World.Map _world;
    // private Texture2D _logo;

    public Game1() : base("Tunnet but not", 1280, 720, fullScreen: false)
    {
        // Content.RootDirectory = "Content";
        // IsMouseVisible = true;
    }

    protected override void Initialize()
    {
        // TODO: Add your initialization logic here
        // _world = new World.Map(mapId: 0);
        // _world.LoadMap();
        //

        base.Initialize();
    }

    private Sprite _404;
    // private AnimatedSprite _animatedSprite;
    protected override void LoadContent()
    {
        TextureAtlas atlas = TextureAtlas.FromFile(Content, "images/atlas-definition.xml");

        _404 = atlas.CreateSprite("404");
        // _animatedSprite = atlas.CreateAnimatedSprite("404");
    }

    private const int _CAMERA_SPEED = 5;
    Viewport _cameraPosition;
    Point _mousePosition;
    protected override void Update(GameTime gameTime)
    {
        if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
            Exit();

        // TODO: Add your update logic here

        // Animations
        // _animatedSprite.Update(gameTime);

        // Inputs
        // https://docs.monogame.net/articles/tutorials/building_2d_games/10_handling_input/

        if (_cameraPosition.Equals(new Viewport())) _cameraPosition = GraphicsDevice.Viewport;
        
        CheckKeyboardInput();
        CheckMouseInput();

        base.Update(gameTime);
    }
    private void CheckKeyboardInput()
    {
        // Get the state of keyboard input
        KeyboardState keyboardState = Keyboard.GetState();

        // If the space key is held down, the movement speed increases by 1.5
        int speed = _CAMERA_SPEED;
        if (keyboardState.IsKeyDown(Keys.Space))
        {
            speed = (int)Math.Floor(speed * 1.5);
        }
        if (keyboardState.IsKeyDown(Keys.W) || keyboardState.IsKeyDown(Keys.Up))
        {
            _cameraPosition.Y += speed;
        }
        if (keyboardState.IsKeyDown(Keys.S) || keyboardState.IsKeyDown(Keys.Down))
        {
            _cameraPosition.Y -= speed;
        }
        if (keyboardState.IsKeyDown(Keys.A) || keyboardState.IsKeyDown(Keys.Left))
        {
            _cameraPosition.X += speed;
        }
        if (keyboardState.IsKeyDown(Keys.D) || keyboardState.IsKeyDown(Keys.Right))
        {
            _cameraPosition.X -= speed;
        }
        //
        GraphicsDevice.Viewport = _cameraPosition;
    }
    private void CheckMouseInput()
    {
        // Get the state of mouse input
        MouseState mouseState = Mouse.GetState();
        
        //Move camera with right mouse button
        if (mouseState.RightButton == ButtonState.Pressed)
        {
            _mousePosition -= mouseState.Position; // delta

            _cameraPosition!.X = _cameraPosition.X - _mousePosition.X;
            _cameraPosition.Y = _cameraPosition.Y - _mousePosition.Y;
        }
        //
        GraphicsDevice.Viewport = _cameraPosition;
        _mousePosition = mouseState.Position; // here because of wasd breaking it
    }

    protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.CornflowerBlue);

        SpriteBatch.Begin(sortMode: SpriteSortMode.Deferred);

        // World.Map.Draw draw = new World.Map.Draw(in _spriteBatch); //TODO: fix
        // _spriteBatch.Draw(_world._defaultTile, _world._defaultTile.Bounds.Center.ToVector2(), Color.White); //TODO: fix

        /// TODO: Draw
        /// 1. floor
        /// 2. wires
        /// 3. buildings
        /// 4. entities
        /// 5. walls
        /// 
        /// MINIMIZE texture swaps
        /// MAXIMIZE drawRectangle usage per texture

        _404.Draw(SpriteBatch, Vector2.Zero);

        SpriteBatch.End();
        //
        base.Draw(gameTime);
    }
}