MonoGame.Samples/StarWarrior/Core/Systems/RenderSystem.cs

#region File description

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="RenderSystem.cs" company="GAMADU.COM">
//     Copyright � 2013 GAMADU.COM. All rights reserved.
//
//     Redistribution and use in source and binary forms, with or without modification, are
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//
//        1. Redistributions of source code must retain the above copyright notice, this list of
//           conditions and the following disclaimer.
//
//        2. Redistributions in binary form must reproduce the above copyright notice, this list
//           of conditions and the following disclaimer in the documentation and/or other materials
//           provided with the distribution.
//
//     THIS SOFTWARE IS PROVIDED BY GAMADU.COM 'AS IS' AND ANY EXPRESS OR IMPLIED
//     WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GAMADU.COM OR
//     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
//     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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//     The views and conclusions contained in the software and documentation are those of the
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// </copyright>
// <summary>
//   The render system.
// </summary>
// --------------------------------------------------------------------------------------------------------------------
#endregion File description

namespace StarWarrior.Systems
{
    #region Using statements

    using System;

    using Artemis;
    using Artemis.Attributes;
    using Artemis.Manager;
    using Artemis.System;

    using Microsoft.Xna.Framework;
    using Microsoft.Xna.Framework.Content;
    using Microsoft.Xna.Framework.Graphics;

    using StarWarrior.Components;
    using StarWarrior.Spatials;

    #endregion

    /// <summary>The render system.</summary>
    [ArtemisEntitySystem(GameLoopType = GameLoopType.Draw, Layer = 0)]
    public class RenderSystem : EntityProcessingSystem
    {
        /// <summary>The content manager.</summary>
        private ContentManager contentManager;

        /// <summary>The spatial name.</summary>
        private string spatialName;

        /// <summary>The sprite batch.</summary>
        private SpriteBatch spriteBatch;

        /// <summary>Initializes a new instance of the <see cref="RenderSystem" /> class.</summary>
        public RenderSystem()
            : base(Aspect.All(typeof(TransformComponent), typeof(SpatialFormComponent)))
        {
        }

        /// <summary>Override to implement code that gets executed when systems are initialized.</summary>
        public override void LoadContent()
        {
            this.spriteBatch = BlackBoard.GetEntry<SpriteBatch>("SpriteBatch");
            this.contentManager = BlackBoard.GetEntry<ContentManager>("ContentManager");
        }

        /// <summary>Processes the specified entity.</summary>
        /// <param name="entity">The entity.</param>
        public override void Process(Entity entity)
        {
            var transformComponent = entity.GetComponent<TransformComponent>();
            var spatialFormComponent = entity.GetComponent<SpatialFormComponent>();

            if (spatialFormComponent != null)
            {
                this.spatialName = spatialFormComponent.SpatialFormFile;

                if (transformComponent.X >= 0 &&
                    transformComponent.Y >= 0 &&
                    transformComponent.X < this.spriteBatch.GraphicsDevice.Viewport.Width &&
                    transformComponent.Y < this.spriteBatch.GraphicsDevice.Viewport.Height)
                {
                    // very naive render ...
                    if (string.Compare("PlayerShip", this.spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                    {
                        PlayerShip.Render(this.spriteBatch, this.contentManager, transformComponent);
                    }
                    else if (string.Compare("Missile", this.spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                    {
                        Missile.Render(this.spriteBatch, this.contentManager, transformComponent);
                    }
                    else if (string.Compare("EnemyShip", this.spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                    {
                        EnemyShip.Render(this.spriteBatch, this.contentManager, transformComponent);
                    }
                    else if (string.Compare("BulletExplosion", this.spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                    {
                        Explosion.Render(this.spriteBatch, this.contentManager, transformComponent, Color.Red, 10);
                    }
                    else if (string.Compare("ShipExplosion", this.spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                    {
                        ShipExplosion.Render(this.spriteBatch, this.contentManager, transformComponent, Color.Yellow, 30);
                    }
                }
            }
        }
    }
}