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Posted on
2008-03-22 15:54
xingd
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MineBoard類，將布局和交互的功能都移到另外的類上實現。
  Code
 using System;
using System.Collections;
using System.Collections.Generic;
namespace xingd.Minesweeper
 {
 public enum GameStatus
  {
NotStarted,
Playing,
Win,
Lose
 }
public enum MineCellStatus : short
{
Covered,
MarkDoubt,
MarkMine,
Uncovered,
Exploded
}
public class MineCell
{
public MineCellStatus Status;
public bool IsMine;
public byte NearbyMines;
}
public class MineCellActionArgs
{
private MineCell cell;
private int row;
private int column;
public MineCellActionArgs(MineCell cell, int row, int column)
{
this.cell = cell;
this.row = row;
this.column = column;
}
public MineCell Cell { get { return cell; } }
public int Row { get { return row; } }
public int Column { get { return column; } }
}
public class MineBoard
{
private MineCell[,] cells = new MineCell[0, 0];
private GameStatus status;
public int Columns { get { return cells.GetLength(1); } }
public int Rows { get { return cells.GetLength(0); } }
public int TotalMines { get { return Count(c => c.IsMine); } }
public int MarkedMines { get { return Count(c => c.Status == MineCellStatus.MarkMine); } }
public int UncoveredMines { get { return Count(c => c.Status == MineCellStatus.Uncovered); }}
public GameStatus Status { get { return status; } }
public MineCell this[int row, int col] { get { return cells[row, col]; } }
public void Init(int rows, int columns, Action<MineBoard> builder)
{
cells = new MineCell[rows, columns];
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < columns; j++)
{
cells[i, j] = new MineCell();
}
}
builder(this);
status = GameStatus.NotStarted;
}
public bool IsValidCell(int row, int column)
{
return row >= 0 && row < Rows && column >= 0 && column < Columns;
}
public void WalkNearbyCells(int row, int column, Action<MineCellActionArgs> callback, Predicate<MineCellActionArgs> match)
{
if (IsValidCell(row, column))
{
MineCellActionArgs args = new MineCellActionArgs(cells[row, column], row, column);
callback(args);
if (match(args))
{
for (int i = -1; i < 2; i++)
{
for (int j = -1; j < 2; j++)
{
if (i != 0 || j != 0)
{
WalkNearbyCells(row + i, column + j, callback, match);
}
}
}
}
}
}
public void DoAction(Action<MineBoard> action)
{
if (status == GameStatus.NotStarted)
{
status = GameStatus.Playing;
}
if (status == GameStatus.Playing)
{
action(this);
}
int count = 0;
// No TrueForAll for two-dimensional arrays, so manual foreach needed
foreach (MineCell cell in cells)
{
if (cell.IsMine && cell.Status == MineCellStatus.Exploded)
{
status = GameStatus.Lose;
return;
}
else if (cell.Status == MineCellStatus.MarkMine || cell.Status == MineCellStatus.Uncovered)
{
++count;
}
}
if (count == cells.Length)
{
status = GameStatus.Win;
}
}
private int Count(Predicate<MineCell> match)
{
int count = 0;
foreach (MineCell cell in cells)
{
if (match(cell)) count++;
}
return count;
}
}
 }
為了代碼上的靈活性和進一步擴展，將MineCell由原來的struct改為了class。
對于比Minesweeper更復雜的游戲，也可以將坐標（row, column）直接加到MineCell類中，或者將MineBoard的引用也存儲在MineCell類內。
MineBoard類提供了三個核心的邏輯實現方法，Init方法接受一個Action<MineBoard>參數，允許外部指定初始化布局。與上一篇隨筆中描述的不同，這次調整將MineBoard的大小與初始化布局分開了，因此Init方法也需要傳入rows和columns，由MineBoard類創建所有的MineCell實例后再由builder初始布局。
WalkNearbyCells實現對一個MineCell周圍遞歸處理的功能，原型為WalkNearbyCells(int row, int column, Action<MineCellActionArgs> callback, Predicate<MineCellActionArgs> match)。MineCellActionArgs包含MineCell和其坐標，如果按前文描述將坐標加上MineCell類，則不需要單獨的一個Args類了。
DoAction方法用來實現邏輯操作，具體操作由傳入的 Action<MineBoard> action指定。
在MineActions文件中，實現了一個純虛基類：
public abstract class BaseMineAction
{
protected int row;
protected int column;
public BaseMineAction(int row, int column)
{
if (row < 0 || column < 0)
{
throw new ArgumentException();
}
this.row = row;
this.column = column;
}
public void Run(MineBoard board)
{
if (board.IsValidCell(row, column))
{
MineCell cell = board[row, column];
RunValidCell(board, cell);
}
}
protected abstract void RunValidCell(MineBoard board, MineCell cell);
}
DistanceMatch類用來限制遞歸操作中遠離初始點的距離，也可以在MineBoard類上加入一個重載的WalkNeabyCells方法，指定depth。不過從通用性的角度，僅保留了傳入Match<MineCellActionArgs>的方法。
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