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Adam K Dean
Adam K Dean

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XNA IScreen code

#csharp #xna #gamedev

I have been doing some XNA, and in order to utilise some sort of game screen system without using a Microsoft version, I've created this. Some parts have been borrowed from the internet, such as ServiceExtensionMethods, but it works very well.

IScreen.cs

using Microsoft.Xna.Framework; namespace IScreenSystem { public interface IScreen { void Update(GameTime gameTime); void Draw(GameTime gameTime); } }
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ServiceExtensionMethods.cs

using Microsoft.Xna.Framework; namespace IScreenSystem { static class ServiceExtensionMethods { public static void AddService<t> (this GameServiceContainer services, T service) { services.AddService(typeof(T), service); } public static T GetService<t>(this GameServiceContainer services) { return (T)services.GetService(typeof(T)); } } }
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VariableService.cs (Edit: removed IVariableService as it wasn't needed)

using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Content; namespace IScreenSystem { public class VariableService { public Game Game { get; set; } public GraphicsDeviceManager Graphics { get; set; } public GraphicsDevice GraphicsDevice { get; set; } public ContentManager Content { get; set; } public SpriteBatch SpriteBatch { get; set; } public IScreen CurrentScreen { get; set; } } }
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TestScreen.cs

using System; using System.Collections.Generic; using System.Linq; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Audio; using Microsoft.Xna.Framework.Content; using Microsoft.Xna.Framework.GamerServices; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Input; using Microsoft.Xna.Framework.Media; namespace IScreenSystem { class TestScreen : IScreen { private VariableService vars; public TestScreen(Game game) { vars = ServiceExtensionMethods .GetService<variableservice>(game.Services); } public void Update(GameTime gameTime) { // to change screen, simply // vars.CurrentScreen = new TestScreen(vars.Game); } public void Draw(GameTime gameTime) { vars.GraphicsDevice.Clear(Color.Black); } } }
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Game1.cs

using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; namespace IScreenSystem { public class Game1 : Microsoft.Xna.Framework.Game { private VariableService vars; private GraphicsDeviceManager graphics; public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; } protected override void Initialize() { base.Initialize(); } protected override void LoadContent() { ServiceExtensionMethods.AddService<variableservice> (this.Services, new VariableService()); vars = ServiceExtensionMethods .GetService<variableservice>(this.Services); vars.Game = this; vars.Content = Content; vars.Graphics = graphics; vars.GraphicsDevice = graphics.GraphicsDevice; vars.SpriteBatch = new SpriteBatch(GraphicsDevice); vars.CurrentScreen = new TestScreen(this); } protected override void UnloadContent() { } protected override void Update(GameTime gameTime) { vars.CurrentScreen.Update(gameTime); base.Update(gameTime); } protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); vars.CurrentScreen.Draw(gameTime); base.Draw(gameTime); } } }
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If you need it explaining more, leave a comment.

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