MonoGame.XNASamples/Samples/Spacewar_4_0/Asteroid.cs

#region File Description
//-----------------------------------------------------------------------------
// Asteroid.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#endregion

#region Using Statements
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
#endregion

namespace Spacewar
{
    /// <summary>
    /// The types of asteroid
    /// </summary>
    public enum AsteroidType
    {
        /// <summary>
        /// Large asteroid
        /// </summary>
        Large,

        /// <summary>
        /// Small asteroid
        /// </summary>
        Small,
    }
    class Asteroid : SpacewarSceneItem
    {
        private float roll;
        private float pitch;
        private float yaw;

        private bool destroyed;

        private float rollIncrement;
        private float pitchIncrement;
        private float yawIncrement;

        private static Random random = new Random();

        #region Properties
        public bool Destroyed
        {
            get
            {
                return destroyed;
            }
            set
            {
                destroyed = value;
            }
        }
        #endregion

        public Asteroid(Game game, AsteroidType asteroidType, Vector3 position)
            : base(game, new BasicEffectShape(game, BasicEffectShapes.Asteroid, (int)asteroidType, LightingType.InGame), position)
        {
            //Random spin increments on all 3 axis
            rollIncrement = (float)random.NextDouble() - .5f;
            pitchIncrement = (float)random.NextDouble() - .5f;
            yawIncrement = (float)random.NextDouble() - .5f;

            if (asteroidType == AsteroidType.Large)
                Radius = 15;

            if (asteroidType == AsteroidType.Small)
                Radius = 6;
        }

        public override void Update(TimeSpan time, TimeSpan elapsedTime)
        {
            //Random rotation
            roll += rollIncrement * (float)elapsedTime.TotalSeconds;
            yaw += yawIncrement * (float)elapsedTime.TotalSeconds;
            pitch += pitchIncrement * (float)elapsedTime.TotalSeconds;

            rotation = new Vector3(roll, pitch, yaw);
            base.Update(time, elapsedTime);
        }
    }
}