Time for action – the TileMap class – part 3

1. Add the Draw() method to the TileMap class:

   #region Drawing
   static public void Draw(SpriteBatch spriteBatch)
   {
       int startX = GetCellByPixelX((int)Camera.Position.X);
       int endX = GetCellByPixelX((int)Camera.Position.X +
             Camera.ViewPortWidth);
   
       int startY = GetCellByPixelY((int)Camera.Position.Y);
       int endY = GetCellByPixelY((int)Camera.Position.Y +
                 Camera.ViewPortHeight);
   
       for (int x = startX; x <= endX; x++)
           for (int y = startY; y <= endY; y++) 
           {
               for (int z = 0; z < MapLayers; z++)
               {
                   if ((x >= 0) && (y >= 0) &&
                       (x < MapWidth) && (y < MapHeight))
                   {
                     spriteBatch.Draw(
                       tileSheet,
                       CellScreenRectangle(x,y),                       
                       TileSourceRectangle(mapCells[x,y].LayerTiles[z]),
                     ...