MonoGame.Extended/Source/Demos/StarWarrior/Systems/RenderSystem.cs

// Original code dervied from:
// https://github.com/thelinuxlich/starwarrior_CSharp/blob/master/StarWarrior/StarWarrior/Systems/RenderSystem.cs

// --------------------------------------------------------------------------------------------------------------------
// <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
//     permitted provided that the following conditions are met:
//
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//           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.
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//     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
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// </copyright>
// <summary>
//   The render system.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using MonoGame.Extended;
using MonoGame.Extended.Entities;
using MonoGame.Extended.Entities.Systems;
using StarWarrior.Components;
using StarWarrior.Spatials;

namespace StarWarrior.Systems
{
    public class RenderSystem : EntityDrawSystem
    {
        private readonly ContentManager _contentManager;
        private readonly SpriteBatch _spriteBatch;

        public RenderSystem(SpriteBatch spriteBatch, ContentManager contentManager) 
            : base(Aspect.All(typeof(SpatialFormComponent), typeof(Transform2)))
        {
            _spriteBatch = spriteBatch;
            _contentManager = contentManager;
        }

        public override void Initialize(IComponentMapperService mapperService)
        {
        }

        public override void Draw(GameTime gameTime)
        {
            foreach (var entityId in ActiveEntities)
            {
                var entity = GetEntity(entityId);
                var spatial = entity.Get<SpatialFormComponent>();
                var transform = entity.Get<Transform2>();

                var spatialName = spatial.SpatialFormFile;

                var worldPosition = transform.WorldPosition;
                if (!(worldPosition.X >= 0) || !(worldPosition.Y >= 0) ||
                    !(worldPosition.X < _spriteBatch.GraphicsDevice.Viewport.Width) ||
                    !(worldPosition.Y < _spriteBatch.GraphicsDevice.Viewport.Height))
                    return;

                // very naive render ...
                if (string.Compare("PlayerShip", spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                {
                    PlayerShip.Render(_spriteBatch, _contentManager, transform);
                }
                else if (string.Compare("Missile", spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                {
                    Missile.Render(_spriteBatch, _contentManager, transform);
                }
                else if (string.Compare("EnemyShip", spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                {
                    EnemyShip.Render(_spriteBatch, _contentManager, transform);
                }
                else if (string.Compare("BulletExplosion", spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                {
                    Explosion.Render(_spriteBatch, _contentManager, transform, Color.Red, 10);
                }
                else if (string.Compare("ShipExplosion", spatialName, StringComparison.InvariantCultureIgnoreCase) == 0)
                {
                    ShipExplosion.Render(_spriteBatch, _contentManager, transform, Color.Yellow, 30);
                }
            }
        }
    }
}