MonoGame.Extended/Source/Demos/SpaceGame/Entities/Laser.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MonoGame.Extended;
using MonoGame.Extended.Sprites;
using MonoGame.Extended.TextureAtlases;

namespace SpaceGame.Entities
{
    public class Laser : Entity
    {
        private readonly Sprite _sprite;
        private readonly Transform2 _transform;
        private float _timeToLive;

        public Vector2 Position
        {
            get { return _transform.Position; }
            set { _transform.Position = value; }
        }

        public float Rotation
        {
            get { return _transform.Rotation; }
            set { _transform.Rotation = value; }
        }

        public Vector2 Velocity { get; set; }

        public Laser(TextureRegion2D textureRegion, Vector2 velocity)
        {
            _timeToLive = 1.0f;
            _sprite = new Sprite(textureRegion);
            _transform = new Transform2
            {
                Scale = Vector2.One * 0.5f
            };

            Velocity = velocity;
        }

        public override void Update(GameTime gameTime)
        {
            var deltaTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
            Position += Velocity * deltaTime;

            _timeToLive -= deltaTime;

            if (_timeToLive <= 0)
            {
                Destroy();
            }
        }

        public override void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(_sprite, _transform);
        }
    }
}