Monogame - TiledSharp - Parsing TMX file with several layers, Scrolling Enabled. - Joshua Langley

Game2.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.Diagnostics;
using System.Xml.Linq;
using TiledSharp;

namespace GameExample
{
    /// <summary>
    /// Copyright Joshua Langley 2016
    /// email: jdoe090910@gmail.com
    /// </summary>
    public class Game2 : Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        TmxMap map;
        Texture2D tileset;

        int tileWidth;
        int tileHeight;
        int tilesetTilesWide;
        int tilesetTilesHigh;

        int tilesWidth = 28;
        int tilesHeight = 18;

        int tilesOffsetX = 0;
        int tilesOffsetY = 0;

        bool movingDown = false;
        bool movingUp = false;
        bool movingLeft = false;
        bool movingRight = false;

        public Game2()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            map = new TmxMap("Content/gamemap.tmx");
            tileset = Content.Load<Texture2D>(map.Tilesets[0].Name.ToString());

            tileWidth = map.Tilesets[0].TileWidth;
            tileHeight = map.Tilesets[0].TileHeight;

            tilesetTilesWide = tileset.Width / tileWidth;
            tilesetTilesHigh = tileset.Height / tileHeight;
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// game-specific content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
                Exit();
            if (Keyboard.GetState().IsKeyDown(Keys.W))
                movingUp = true;
            if (Keyboard.GetState().IsKeyUp(Keys.W))
                movingUp = false;
            if (Keyboard.GetState().IsKeyDown(Keys.S))
                movingDown = true;
            if (Keyboard.GetState().IsKeyUp(Keys.S))
                movingDown = false;
            if (Keyboard.GetState().IsKeyDown(Keys.A))
                movingLeft = true;
            if (Keyboard.GetState().IsKeyUp(Keys.A))
                movingLeft = false;
            if (Keyboard.GetState().IsKeyDown(Keys.D))
                movingRight = true;
            if (Keyboard.GetState().IsKeyUp(Keys.D))
                movingRight = false;

            if (movingUp)
            {
                tilesOffsetY--;
            }
            if (movingDown)
            {
                tilesOffsetY++;
            }
            if (movingLeft)
            {
                tilesOffsetX--;
            }
            if (movingRight)
            {
                tilesOffsetX++;
            }
            tilesOffsetY = Utils.Clamp(tilesOffsetY, 0, map.Height- tilesHeight);
            tilesOffsetX = Utils.Clamp(tilesOffsetX, 0, map.Width - tilesWidth);



            base.Update(gameTime);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);


            spriteBatch.Begin();

            for (var j = 0; j < map.Layers.Count; ++j)
            {
                for (var i = 0; i < tilesHeight; ++i)
                {
                    for (var k = 0; k < tilesWidth; ++k)
                    {

                        int gidIndex =(k % tilesWidth)+tilesOffsetX + ((i+tilesOffsetY)*map.Width);
                        int gid = map.Layers[j].Tiles[gidIndex].Gid;

                        // Empty tile, do nothing
                        if (gid == 0)
                        {

                        }
                        else
                        {
                            int tileFrame = gid - 1;
                            int column = tileFrame % tilesetTilesWide;
                            int row = (int)Math.Floor((double)tileFrame / (double)tilesetTilesWide);

                            float x = (k) * map.TileWidth;
                            float y = (i) * map.TileHeight;

                            Rectangle tilesetRec = new Rectangle(tileWidth * column, tileHeight * row, tileWidth, tileHeight);

                            spriteBatch.Draw(tileset, new Rectangle((int)x, (int)y, tileWidth, tileHeight), tilesetRec, Color.White);
                        }
                    }
                }
            }

            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}