//string _Score = "0:0";
#endregion
#region Constructor
public PongScreen(Game game)
{
//XNA objects
_game = game;
//Pong objects
_ball = new Ball(_game, _margin);
_blockLeft = new BlockLeft(_game, _margin);
_blockRight = new BlockRight(_game, _margin);
//XNA-Pong objects integration in the game
_game.Components.Add(_ball);
_game.Components.Add(_blockLeft);
_game.Components.Add(_blockRight);
}
public IEnumerable <IAstNode> Visit()
{
IAstNode node = Block.First;
while (node != null)
{
//We reached a child block, visit the nodes inside.
while (node is AstBlock childBlock)
{
Block = childBlock;
node = childBlock.First;
BlockEntered?.Invoke(this, new BlockVisitationEventArgs(Block));
}
//Node may be null, if the block is empty.
if (node != null)
{
IAstNode next = Next(node);
yield return(node);
node = next;
}
//We reached the end of the list, go up on tree to the parent blocks.
while (node == null && Block.Type != AstBlockType.Main)
{
BlockLeft?.Invoke(this, new BlockVisitationEventArgs(Block));
node = Next(Block);
Block = Block.Parent;
}
}
}
