XNA 4.0 Game Development by Example Beginner's Guide（Visual Basic Edition）

书名：XNA 4.0 Game Development by Example Beginner's Guide（Visual Basic Edition）
作者名：Kurt Jaegers
本章字数：152字
更新时间：2021-08-20 15:50:43

Time for action – generating fading pieces

In the Game1 class, modify the CheckScoringChain() method by adding the following call inside the for each loop, before the square is set to Empty:

_gameBoard.AddFadingPiece(
    CInt(thisPipe.X),
    CInt(thisPipe.Y),
    _gameBoard.GetSquare(
        CInt(thisPipe.X),
        CInt(thisPipe.Y)))

What just happened?

Adding fading pieces is simply a matter of getting the type of piece currently occupying the square that we wish to remove (before it is replaced with an empty square) and adding it to the FadingPieces dictionary. We need to use the CInt typecasts because the thisPipe variable is a Vector2 value, which stores its X and Y components as Singles.

Falling pieces

Falling pieces are added to the game board in two possible locations: from the FillFromAbove() method when a piece is being moved from one location on the board to another, and in the GenerateNewPieces() method when a new piece falls in from the top of the game board.