Alternative to Game Screen Management - An Example

#gamedev #xna #csharp

So just to give you an example of how clean you can make your code, let us look at a very simple menu screen, which simply asks for any key to be pressed. As you can see, it's -very- clean.

I also love #region's as well, best thing since line numbers.

For more information on my game Space Rocks - visit my newly designed (I'm working on it okay!) website at www.adamkdean.co.uk

(Update: game is no longer there, this post is here for history.)

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 SpaceRocks
{
    class MenuScreen : IScreen
    {
        #region Variables
        private VariableService vars;

        private SpriteFont font;
        private Texture2D mainBackground;
        #endregion

        #region Constructor Methods
        public MenuScreen(Game game)
        {
            vars = ServiceExtensionMethods
                .GetService<variableservice>(game.Services);

            LoadContent();
        }

        private void LoadContent()
        {
            mainBackground = vars.Content.Load<texture2d>("Images/background");
            font = vars.Content.Load<spritefont>("Fonts/Menu");
        }
        #endregion

        #region Update Methods
        public void Update(GameTime gameTime)
        {
            UpdateInput();
        }

        private void UpdateInput()
        {
            if (Keyboard.GetState().GetPressedKeys().Length > 0)
                vars.CurrentScreen = new GameScreen(vars.Game);
        }
        #endregion

        #region Draw Methods
        public void Draw(GameTime gameTime)
        {
            vars.GraphicsDevice.Clear(Color.Black);

            vars.SpriteBatch.Begin();

            DrawBackground();
            DrawText();

            vars.SpriteBatch.End();
        }

        private void DrawBackground()
        {
            vars.SpriteBatch.Draw(mainBackground, Vector2.Zero, Color.White);
        }

        private void DrawText()
        {
            string text = "Press any key to begin..";
            Vector2 textSize = font.MeasureString(text);

            int x = vars.GraphicsDevice.Viewport.Width / 2 - (int)textSize.X / 2;
            int y = vars.GraphicsDevice.Viewport.Height / 2 - (int)textSize.Y / 2;

            vars.SpriteBatch.DrawString(font, text,
                new Vector2(x, y), Color.White);
        }
        #endregion
    }
}

For anyone wondering why there are some tags at the end of certain code posts, it's because the awesome script I use cannot handle generics :(