Time for action – building the GameObject class – part 3

1. Add the map-based collision detection methods to the GameObject class:

   #region Map-Based Collision Detection Methods
   private Vector2 horizontalCollisionTest(Vector2 moveAmount)
   {
       if (moveAmount.X == 0)
           return moveAmount;
   
       Rectangle afterMoveRect = CollisionRectangle;
       afterMoveRect.Offset((int)moveAmount.X,0);
       Vector2 corner1, corner2;
   
       if (moveAmount.X < 0)
       {
           corner1 = new Vector2(afterMoveRect.Left,
                                 afterMoveRect.Top + 1);
           corner2 = new Vector2(afterMoveRect.Left, 
                                 afterMoveRect.Bottom - 1);
       }
       else
       {
           corner1 = new Vector2(afterMoveRect.Right, 
                                 afterMoveRect.Top + 1);
           corner2 = new Vector2(afterMoveRect.Right, 
                                 afterMoveRect.Bottom - 1);
       }
   
       Vector2 mapCell1 = TileMap.GetCellByPixel(corner1);
       Vector2 mapCell2 = TileMap.GetCellByPixel...