MonoGame.Extended/Source/Demos/SpaceGame/Entities/Meteor.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 Meteor : Entity
    {
        private const float _radius = 55f / 4f;
        private readonly Sprite _sprite;
        private readonly Transform2 _transform = new Transform2();

        public CircleF BoundingCircle;

        public int HealthPoints { get; private set; }

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

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

        public float RotationSpeed { get; }
        public int Size { get; private set; }
        public Vector2 Velocity { get; set; }

        public Meteor(TextureRegion2D textureRegion, Vector2 position, Vector2 velocity, float rotationSpeed, int size)
        {
            _sprite = new Sprite(textureRegion);
            BoundingCircle = new CircleF(_transform.Position, _radius * size);

            Position = position;
            Velocity = velocity;
            RotationSpeed = rotationSpeed;
            HealthPoints = 1;
            Size = size;
        }

        public void Damage(int damage)
        {
            HealthPoints -= damage;

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

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

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

        public bool Contains(Vector2 position)
        {
            return BoundingCircle.Contains(position);
        }
    }
}