Game1.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 Tetris
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        private const int _HorizOffset = 10;
        private const int _VertOffset = 2;
        private const int _Height = 40;
        private const int _Width = 10;


        readonly GraphicsDeviceManager _graphics;
        SpriteBatch _spriteBatch;

        Block _block;
        private TimeSpan _elapsedTime;
        private TimeSpan _moveTimer;
        private Texture2D _texture;
        private List<Block> _blockList;
        private List<bool[,]> _blockArray;

        public Game1()
        {
            _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
            _elapsedTime = new TimeSpan(0);
            _blockList = new List<Block>();

            _blockArray = new List<bool[,]>
                              {
                                  //Straight Block
                                  new[,]
                                      {
                                          {true, true, true, true}
                                      },
                                  new[,]
                                      {
                                          {true},
                                          {true},
                                          {true},
                                          {true}
                                      },
                                  new[,]
                                      {
                                          {true, true, true, true}
                                      },
                                  new[,]
                                      {
                                          {true},
                                          {true},
                                          {true},
                                          {true}
                                      },
                                  //Square Block
                                  new[,]
                                      {
                                          {true, true},
                                          {true, true},
                                      },
                                  new[,]
                                      {
                                          {true, true},
                                          {true, true},
                                      },
                                  new[,]
                                      {
                                          {true, true},
                                          {true, true},
                                      },
                                  new[,]
                                      {
                                          {true, true},
                                          {true, true},
                                      },
                                  //S Block
                                  new[,]
                                      {
                                          {false, true, true},
                                          {true, true, false}
                                      },
                                  new[,]
                                      {
                                          {true, false},
                                          {true, true},
                                          {false, true}
                                      },
                                  new[,]
                                      {
                                          {false, true, true},
                                          {true, true, false}
                                      },
                                  new[,]
                                      {
                                          {true, false},
                                          {true, true},
                                          {false, true}
                                      },
                                  //T Block
                                  new[,]
                                      {
                                          {false, true, false},
                                          {true, true, true}
                                      },
                                  new[,]
                                      {
                                          {true, false},
                                          {true, true},
                                          {true, false}
                                      },
                                  new[,]
                                      {
                                          {true, true, true},
                                          {false, true, false}
                                      },
                                  new[,]
                                      {
                                          {false, true},
                                          {true, true},
                                          {false, true}
                                      },
                                  //Z Block
                                  new[,]
                                      {
                                          {true, true, false},
                                          {false, true, true}
                                      },
                                  new[,]
                                      {
                                          {false, true},
                                          {true, true},
                                          {true, false}
                                      },
                                  new[,]
                                      {
                                          {true, true, false},
                                          {false, true, true}
                                      },
                                  new[,]
                                      {
                                          {false, true},
                                          {true, true},
                                          {true, false}
                                      },
                                  //Backwards L Block
                                  new[,]
                                      {
                                          {true, false, false},
                                          {true, true, true}
                                      },
                                  new[,]
                                      {
                                          {true, true},
                                          {true, false},
                                          {true, false}
                                      },
                                  new[,]
                                      {
                                          {true, true, true},
                                          {false, false, true}
                                      },
                                  new[,]
                                      {
                                          {false, true},
                                          {false, true},
                                          {true, true}
                                      },
                                  //L Block
                                  new[,]
                                      {
                                          {false, false, true},
                                          {true, true, true}
                                      },
                                  new[,]
                                      {
                                          {true, false},
                                          {true, false},
                                          {true, true}
                                      },
                                  new[,]
                                      {
                                          {true, true, true},
                                          {true, false, false}
                                      },
                                  new[,]
                                      {
                                          {true, true},
                                          {false, true},
                                          {false, true}
                                      }
                              };

            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.
            _texture = new Texture2D(_graphics.GraphicsDevice, 1, 1);
            _texture.SetData(new[] { Color.White });
            _spriteBatch = new SpriteBatch(GraphicsDevice);
            var floor = new bool[1,_Width];
            for (int i = 0; i < _Width; ++i)
                floor[0,i] = true;
            _blockList.Add(new Block(new Vector2(_HorizOffset,_Height + _VertOffset), floor, Color.Red, _texture ));
            _blockList.Add(new Block(new Vector2(_HorizOffset, _VertOffset - 1), floor, Color.Red, _texture));

            var side = new bool[_Height, 1];
            for (int i = 0; i < _Height; ++i)
                side[i, 0] = true;
            _blockList.Add(new Block(new Vector2(_HorizOffset - 1, _VertOffset), side, Color.Red, _texture));
            _blockList.Add(new Block(new Vector2(_HorizOffset + _Width, _VertOffset), side, Color.Red, _texture));

            DropBlock();


            // TODO: use this.Content to load your game content here
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all 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 (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Left) && _moveTimer > new TimeSpan(0,0,0,0,80))
            {
                _block.Move(Direction.Left, _blockList);
                _moveTimer = new TimeSpan(0);
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Right) && _moveTimer > new TimeSpan(0,0,0,0,80))
            {
                _block.Move(Direction.Right, _blockList);
                _moveTimer = new TimeSpan(0);
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Down))
            {
                _block.Drop(_blockList);
            }
            if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Up) && _moveTimer > new TimeSpan(0, 0, 0, 0, 150))
            {
                _block.Turn(_blockList, _blockArray);
                _moveTimer = new TimeSpan(0);
            }

            _elapsedTime += gameTime.ElapsedGameTime;
            _moveTimer += gameTime.ElapsedGameTime;
            if (_elapsedTime.Milliseconds > 500)
            {
                _block.Drop(_blockList);
                _elapsedTime = new TimeSpan(0);
            }

            foreach (Block block in _blockList)
                if (block.IsEmpty())
                    _blockList.Remove(block);

            // TODO: Add your update logic here);

            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();

            // TODO: Add your drawing code here
            _block.Draw(_spriteBatch);
            foreach (Block shape in _blockList)
                shape.Draw(_spriteBatch);
            _spriteBatch.End();

            base.Draw(gameTime);
        }

        void DropBlock(object sender = null, EventArgs e = null)
        {

            _block = new Block(new Vector2(_HorizOffset, _VertOffset), _texture, _blockArray);
            _block.Froze += CheckRows;
        }

        void CheckRows(object sender = null, EventArgs e = null)
        {
            if (_block != null)
                _blockList.Add(_block);
            for(int i = _VertOffset; i < _Height + _VertOffset; ++i)
            {
                bool rowFull = true;
                for ( int j = _HorizOffset; j < _Width + _HorizOffset; ++j)
                {
                    bool contains = false;
                    foreach (Block block in _blockList)
                    {
                        if (block.Contains(new Vector2(j,i)))
                        {
                            contains = true;
                        }
                    }
                    if (!contains)
                        rowFull = false;
                }
                if (rowFull)
                    DeleteRow(i);
            }
            DropBlock();
        }

        void DeleteRow(int row)
        {
            for (int i = _HorizOffset; i < _HorizOffset + _Width; ++i)
            {
                foreach (Block block in _blockList.Where(block => block.Contains(new Vector2(i, row))))
                {
                    block.Delete(new Vector2(i, row));

                }
                MoveAllAboveDown(row);
            }
        }

        void MoveAllAboveDown(int row)
        {
            List<Block> newBlockList = new List<Block>();
            for (int rowCheck = row; rowCheck > _VertOffset; --rowCheck)
            {
                for (int i = _HorizOffset; i < _HorizOffset + _Width; ++i)
                {
                    //If the spot above this is filled
                    if (_blockList.Where(block => block.Contains(new Vector2(i, rowCheck - 1))).ToList().Count > 0)
                    {
                        //insert block here
                        newBlockList.Add(new Block(new Vector2(i, rowCheck), new[,] { { true } }, Color.Black, _texture));
                    }
                    else
                    {
                        var list = _blockList.Where(tempBlock => tempBlock.Contains(new Vector2(i, rowCheck - 1))).ToList();
                        if (list.Count > 0)
                            list.ElementAt(0).Delete(new Vector2(i, rowCheck - 1));
                    }
                }
            }
            for (int rowToDelete = row; rowToDelete > _VertOffset; --rowToDelete)
            {
                DeleteRow(row);
            }
            foreach (Block block in newBlockList)
            {
                _blockList.Add(block);
            }
        }
    }
}