MonoGame.Extended/Source/Demos/Demo.Particles/Game1.cs

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using MonoGame.Extended;
using MonoGame.Extended.Particles;
using MonoGame.Extended.Particles.Modifiers;
using MonoGame.Extended.Particles.Modifiers.Containers;
using MonoGame.Extended.Particles.Modifiers.Interpolators;
using MonoGame.Extended.Particles.Profiles;
using MonoGame.Extended.Sprites;
using MonoGame.Extended.TextureAtlases;
using MonoGame.Extended.ViewportAdapters;

namespace Demo.Particles
{
    public class Game1 : Game
    {
        // ReSharper disable once NotAccessedField.Local
        private readonly GraphicsDeviceManager _graphicsDeviceManager;
        private SpriteBatch _spriteBatch;
        private Sprite _sprite;
        private Camera2D _camera;
        private ParticleEffect _particleEffect;

        public Game1()
        {
            _graphicsDeviceManager = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            IsMouseVisible = true;
            Window.AllowUserResizing = true;
            Window.Position = Point.Zero;
        }

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

            var viewportAdapter = new BoxingViewportAdapter(Window, GraphicsDevice, 800, 480);
            _camera = new Camera2D(viewportAdapter);

            var logoTexture = Content.Load<Texture2D>("logo-square-128");
            _sprite = new Sprite(logoTexture)
            {
                Position = viewportAdapter.Center.ToVector2()
            };

            var particleTexture = new Texture2D(GraphicsDevice, 1, 1);
            particleTexture.SetData(new[] { Color.White });

            ParticleInit(new TextureRegion2D(particleTexture));
        }

        protected override void UnloadContent()
        {
        }

        protected override void Update(GameTime gameTime)
        {
            var deltaTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
            var keyboardState = Keyboard.GetState();
            var mouseState = Mouse.GetState();
            var p = _camera.ScreenToWorld(mouseState.X, mouseState.Y);

            if (keyboardState.IsKeyDown(Keys.Escape))
                Exit();

            _sprite.Rotation += deltaTime;

            _particleEffect.Update(deltaTime);

            if (mouseState.LeftButton == ButtonState.Pressed)
                _particleEffect.Trigger(new Vector2(p.X, p.Y));

            _particleEffect.Trigger(new Vector2(400, 240));

            base.Update(gameTime);
        }

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

            _spriteBatch.Begin(blendState: BlendState.AlphaBlend, transformMatrix: _camera.GetViewMatrix());
            _spriteBatch.Draw(_particleEffect);
            _spriteBatch.Draw(_sprite);
            _spriteBatch.End();

            base.Draw(gameTime);
        }

        private void ParticleInit(TextureRegion2D textureRegion)
        {
            _particleEffect = new ParticleEffect
            {
                Emitters = new[]
                {
                    new ParticleEmitter(textureRegion, 500, TimeSpan.FromSeconds(2.5), Profile.Ring(150f, Profile.CircleRadiation.In))
                    {
                        Parameters = new ParticleReleaseParameters
                        {
                            Speed = new Range<float>(0f, 50f),
                            Quantity = 3,
                            Rotation = new Range<float>(-1f, 1f),
                            Scale = new Range<float>(3.0f, 4.0f)
                        },
                        Modifiers = new IModifier[]
                        {
                            new AgeModifier
                            {
                                Interpolators = new IInterpolator[]
                                {
                                    new ColorInterpolator { InitialColor = new HslColor(0.33f, 0.5f, 0.5f), FinalColor = new HslColor(0.5f, 0.9f, 1.0f) }
                                }
                            },
                            new RotationModifier { RotationRate = -2.1f },
                            new RectangleContainerModifier {  Width = 800, Height = 480 },
                            new LinearGravityModifier { Direction = -Vector2.UnitY, Strength = 30f }
                        }
                    }
                }
            };

        }
    }
}