MonoGame.Extended/Source/SpaceGame/Entities/Spaceship.cs

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

namespace SpaceGame.Entities
{
    public class Spaceship : Entity
    {
        private readonly IBulletFactory _bulletFactory;

        public Spaceship(TextureRegion2D textureRegion, IBulletFactory bulletFactory)
        {
            _bulletFactory = bulletFactory;
            _sprite = new Sprite(textureRegion)
            {
                Scale = Vector2.One * 0.5f,
                Position = new Vector2(400, 240)
            };
            _boundingCircle = new CircleF(_sprite.Position, 20);
        }

        private readonly Sprite _sprite;
        private float _fireCooldown;

        public Vector2 Velocity { get; set; }
        public Vector2 Direction => Vector2.UnitX.Rotate(Rotation);

        public Vector2 Position
        {
            get { return _sprite.Position; }
            set
            {
                _sprite.Position = value;
                _boundingCircle.Center = value;
            }
        }

        public float Rotation
        {
            get { return _sprite.Rotation - MathHelper.ToRadians(90); }
            set { _sprite.Rotation = value + MathHelper.ToRadians(90); }
        }

        private CircleF _boundingCircle;
        public CircleF BoundingCircle => _boundingCircle;

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

            Position += Velocity * deltaTime;
            Velocity *= 0.98f;

            if (_fireCooldown > 0)
                _fireCooldown -= deltaTime;
        }

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

        public void Accelerate(float acceleration)
        {
            Velocity += Direction * acceleration;
        }

        public void LookAt(Vector2 point)
        {
            Rotation = (float) Math.Atan2(point.Y - Position.Y, point.X - Position.X);
        }

        public void Fire()
        {
            if (_fireCooldown > 0)
                return;

            var angle = Rotation + MathHelper.ToRadians(90);
            var muzzle1Position = Position + new Vector2(14, 0).Rotate(angle);
            var muzzle2Position = Position + new Vector2(-14, 0).Rotate(angle);
            _bulletFactory.Create(muzzle1Position, Direction, angle, 550f);
            _bulletFactory.Create(muzzle2Position, Direction, angle, 550f);
            _fireCooldown = 0.2f;
        }
    }
}