Game1.cs

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

namespace Liquish;

public class Game1 : Game {
    private GraphicsDeviceManager _graphics;
    private SpriteBatch _spriteBatch;
    public InputManager IM;
    public LiquidManager LM;
    public Texture2D img;
    public Texture2D EP;
    public List<Rectangle> Eps = [];
    public List<float> Speeds = [];
    public Point ScreenSize => new(_graphics.PreferredBackBufferWidth, _graphics.PreferredBackBufferHeight);

    public Game1() {
        _graphics = new GraphicsDeviceManager(this);
        Content.RootDirectory = "Content";
        IsMouseVisible = true;
    }

    protected override void Initialize() {
        _graphics.PreferredBackBufferWidth = 1066;
        _graphics.PreferredBackBufferHeight = 600;

        _graphics.SynchronizeWithVerticalRetrace = true;
        IsFixedTimeStep = false;
        _graphics.ApplyChanges();
        base.Initialize();
    }

    protected override void LoadContent() {
        _spriteBatch = new SpriteBatch(GraphicsDevice);
        IM = new();
        img = Content.Load<Texture2D>("cool");
        EP = Content.Load<Texture2D>("EP");
        LM = new LiquidManager(GraphicsDevice);
        Color sC = new Color(0.1f, 0.4f, 0.8f) * 0.8f;
        Color bC = new Color(0, 0, 0.2f) * 0.8f;
        Color sC2 = new Color(255, 139, 34) * 0.96f;
        Color bC2 = new Color(255, 119, 0) * 0.96f;
        Liquid waterPool = new(new Rectangle(10, ScreenSize.Y / 2, 400, 200), 0.5f, 150, 0.99f, sC, bC);
        Liquid lavaPool = new(new Rectangle(500, ScreenSize.Y / 2, 400, 200), 0.5f, 150, 0.98f, sC2, bC2);
        LM.Add("waterPool", waterPool);
        LM.Add("lavaPool", lavaPool);
    }

    protected override void Update(GameTime gameTime) {
        IM.Update();
        if (IM.KeyTapped(Keys.Escape))
            Exit();
        if (IM.MBTapped(MouseButton.Left)) {
            Eps.Add(new Rectangle(IM.CMousePos() - new Point(25,24), new(50, 50)));
            Speeds.Add(0);
        }
        for (int i = Eps.Count - 1; i >= 0 ; i--) {
            Rectangle rect = Eps[i];
            bool contained = false;
            foreach (var l in LM.liquids.Values) {
                contained = contained || l.boundingBox.Intersects(rect);
            }
            Speeds[i] += 0.5f;
            rect.Y += (int)Speeds[i];
            Eps[i] = rect;
            foreach (var l in LM.liquids.Values) {
                if (!contained && l.boundingBox.Intersects(rect)) {
                    l.CreateDisturbance(rect.Center.X, 50, 1, 20);
                }
            }
            if (rect.Y > ScreenSize.Y) {
                Eps.RemoveAt(i);
                Speeds.RemoveAt(i);
            }
        }
        LM.Update((float)gameTime.ElapsedGameTime.TotalSeconds);

        base.Update(gameTime);
    }

    protected override void Draw(GameTime gameTime) {
        GraphicsDevice.Clear(Color.White);
        _spriteBatch.Begin();
        _spriteBatch.Draw(img, new Rectangle(Point.Zero, ScreenSize), Color.White);
        foreach (Rectangle Ep in Eps) {
            _spriteBatch.Draw(EP, Ep, Color.White);
        }
        _spriteBatch.End();
        LM.Draw(Matrix.Identity);

        base.Draw(gameTime);
    }
}