Collision Detection (v2.1)

        private void HandleCollisions()
        {
            int x = (int)Math.Floor((float)Position.X / Tile.Side);
            int y = (int)Math.Floor((float)Position.Y / Tile.Side);

            TileCollision collision = level.GetCollision(x, y);

            if (collision != TileCollision.Passable)
            {
                Rectangle column, row;
                Rectangle tile = level.GetBounds(x, y);

                level.ColorColliding(x, y);

                TileCollision leftCollision = level.GetCollision(x - 1, y);
                TileCollision rightCollision = level.GetCollision(x + 1, y);
                TileCollision topCollision = level.GetCollision(x, y - 1);
                TileCollision botCollision = level.GetCollision(x, y + 1);

                #region row
                if (leftCollision == TileCollision.Block)
                {
                    level.ColorColliding(x - 1, y);
                    if (rightCollision == TileCollision.Block)
                    {
                        row = new Rectangle((x - 1) * Tile.Side, y * Tile.Side,
                            Tile.Side * 3, Tile.Side);
                        level.ColorColliding(x + 1, y);
                    }
                    else
                    {
                        row = new Rectangle((x - 1) * Tile.Side, y * Tile.Side,
                            Tile.Side * 2, Tile.Side);
                    }
                }
                else
                {
                    if (rightCollision == TileCollision.Block)
                    {
                        row = new Rectangle(x * Tile.Side, y * Tile.Side,
                            Tile.Side * 2, Tile.Side);
                        level.ColorColliding(x + 1, y);
                    }
                    else
                    {
                        row = new Rectangle(x * Tile.Side, y * Tile.Side,
                            Tile.Side, Tile.Side);
                    }
                }
                #endregion

                #region column
                if (topCollision == TileCollision.Block)
                {
                    level.ColorColliding(x, y - 1);
                    if (botCollision == TileCollision.Block)
                    {
                        column = new Rectangle(x * Tile.Side, (y - 1) * Tile.Side,
                            Tile.Side, Tile.Side * 3);
                        level.ColorColliding(x, y + 1);
                    }
                    else
                    {
                        column = new Rectangle(x * Tile.Side, (y - 1) * Tile.Side,
                            Tile.Side, Tile.Side * 2);
                    }
                }
                else
                {
                    if (botCollision == TileCollision.Block)
                    {
                        column = new Rectangle(x * Tile.Side, y * Tile.Side,
                            Tile.Side, Tile.Side * 2);
                        level.ColorColliding(x, y + 1);
                    }
                    else
                    {
                        column = new Rectangle(x * Tile.Side, y * Tile.Side,
                            Tile.Side, Tile.Side);
                    }
                }
                #endregion

                Vector2 verticalCross, horizontalCross;

                //vertical
                if (momentum.X < 0)
                    verticalCross.X = column.Right;
                else //if (momentum.X > 0)
                    verticalCross.X = column.Left;
                verticalCross.Y = lastPos.Y + ((-(lastPos.X - verticalCross.X) / momentum.X) * momentum.Y);

                //horizontal
                if (momentum.Y < 0)
                    horizontalCross.Y = row.Bottom;
                else //if (momentum.Y > 0)
                    horizontalCross.Y = row.Top;
                horizontalCross.X = lastPos.X + ((-(lastPos.Y - horizontalCross.Y) / momentum.Y) * momentum.X);

                if ((column.Top <= verticalCross.Y && verticalCross.Y <= column.Bottom) &&
                    ((verticalCross.Y < row.Top || row.Bottom < verticalCross.Y) ||
                    (verticalCross.X == row.Left || row.Right == verticalCross.X)))
                    BounceVert(verticalCross.X, position.Y);

                else if (row.Left <= horizontalCross.X && horizontalCross.X <= row.Right &&
                    ((horizontalCross.X < column.Left || column.Right < horizontalCross.X) ||
                    (horizontalCross.Y == column.Top || column.Bottom == horizontalCross.Y)))
                    BounceHorz(Position.X, horizontalCross.Y);

            }
        }