练手WPF（三）——扫雷小游戏的简易实现（下）

十四、响应鼠标点击事件
    （1）设置对应坐标位置为相应的前景状态

/// <summary>
/// 设置单元格图样
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="state"></param>
private void SetCellFore(int x, int y, ForeState state)
{
    if (state > ForeState.QUESTION || state < ForeState.NONE)
        return;

    _foreData[y, x] = (int)state;

    if (ForeCanvas.Children.Contains(_foreImage[y, x]))
        ForeCanvas.Children.Remove(_foreImage[y, x]);

    if (state == ForeState.NONE)
        return;

    _foreImage[y, x].Source = ImageHelper.CutImage(_bmpForeground,
        new Int32Rect((_foreData[y, x] - ) * _cellSize.Width, , _cellSize.Width, _cellSize.Height));
    ForeCanvas.Children.Add(_foreImage[y, x]);
}

如果当前坐标位置设置的前景状态为允许值范围，则将其赋给相应的_foreData元素，并删除原来的图形。如果设置状态为问号或小红旗，则重新设置该图形。

（2）鼠标点击空白区域时，自动打开附近连片的空白区域。使用了以下递归方法。

/// <summary>
/// 自动打开附近空白区域
/// </summary>
/// <param name="y"></param>
/// <param name="x"></param>
private void OpenNearToSpace(int y, int x)
{
    if (y <  || y >= _gameLevel._colGrid || x <  || x >= _gameLevel._rowGrid)//越界
        return;

    if (_backData[y, x] == (int)BackState.BLANK && _foreData[y, x] == (int)ForeState.NORMAL)
    {

        _foreData[y, x] = (int)ForeState.NONE;        //已打开
        if (ForeCanvas.Children.Contains(_foreImage[y, x]))
            ForeCanvas.Children.Remove(_foreImage[y, x]);

        if (y -  >=  && x -  >= )
        {
            OpenNearToSpace(y - , x - );
        }

        if (y -  >= )
        {
            OpenNearToSpace(y - , x);
        }

        if (y -  >=  && x +  <= _gameLevel._rowGrid - )
        {
            OpenNearToSpace(y - , x + );
        }

        if (y +  <= _gameLevel._colGrid -  && x -  >= )
        {
            OpenNearToSpace(y + , x - );
        }

        if (y +  <= _gameLevel._colGrid - )
        {
            OpenNearToSpace(y + , x);
        }

        if (y +  <= _gameLevel._colGrid -  && x +  <= _gameLevel._rowGrid - )
        {
            OpenNearToSpace(y + , x + );
        }
        if (x +  <= _gameLevel._rowGrid - )
        {
            OpenNearToSpace(y, x + );
        }

        if (x -  >= )
        {
            OpenNearToSpace(y, x - );
        }

        Open8Box(y, x);     // 打开周围8个方格
    }

    return;
}

/// <summary>
/// 打开周围8个方格
/// </summary>
/// <param name="y"></param>
/// <param name="x"></param>
private void Open8Box(int y, int x)
{
    if (y -  >=  && x -  >= )
    {
        _foreData[y - , x - ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y - , x - ]))
            ForeCanvas.Children.Remove(_foreImage[y - , x - ]);
    }

    if (y -  >= )
    {
        _foreData[y - , x] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y - , x]))
            ForeCanvas.Children.Remove(_foreImage[y - , x]);
    }
    if (y -  >=  && x +  <= _gameLevel._rowGrid - )
    {
        _foreData[y - , x + ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y - , x + ]))
            ForeCanvas.Children.Remove(_foreImage[y - , x + ]);
    }
    if (x -  >= )
    {
        _foreData[y, x - ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y, x - ]))
            ForeCanvas.Children.Remove(_foreImage[y, x - ]);
    }
    if (x +  <= _gameLevel._rowGrid - )
    {
        _foreData[y, x + ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y, x + ]))
            ForeCanvas.Children.Remove(_foreImage[y, x + ]);
    }
    if (y +  <= _gameLevel._colGrid -  && x -  >= )
    {
        _foreData[y + , x - ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y + , x - ]))
            ForeCanvas.Children.Remove(_foreImage[y + , x - ]);
    }
    if (y +  <= _gameLevel._colGrid - )
    {
        _foreData[y + , x] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y + , x]))
            ForeCanvas.Children.Remove(_foreImage[y + , x]);
    }
    if (y +  <= _gameLevel._colGrid -  && x +  <= _gameLevel._rowGrid - )
    {
        _foreData[y + , x + ] = (int)ForeState.NONE;
        if (ForeCanvas.Children.Contains(_foreImage[y + , x + ]))
            ForeCanvas.Children.Remove(_foreImage[y + , x + ]);
    }
}

（3）添加鼠标左键事件
编辑xaml文件，在ForeCanvas元素内添加MouseLeftButtonDown="ForeCanvas_MouseLeftButtonDown"。后台代码如下：

private void ForeCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (_gameState == GameState.NONE)
        return;

    // 获取鼠标点击的格子位置
    Point mousePoint = e.MouseDevice.GetPosition(ForeCanvas);
    int dx = (int)(mousePoint.X / _cellSize.Width);
    int dy = (int)(mousePoint.Y / _cellSize.Height);

    // 已打开区域
    if (_foreData[dy, dx] == (int)ForeState.NONE)
        return;

    if (_backData[dy, dx] > (int)BackState.BLANK)
    {
        if (ForeCanvas.Children.Contains(_foreImage[dy, dx]))
        {
            ForeCanvas.Children.Remove(_foreImage[dy, dx]);
            _foreData[dy, dx] = (int)ForeState.NONE;
        }
    }

    if (_backData[dy, dx] == (int)BackState.BLANK)
    {
        OpenNearToSpace(dy, dx);
    }

    if (_backData[dy, dx] == (int)BackState.MINE)
    {
        if (ForeCanvas.Children.Contains(_foreImage[dy, dx]))
        {
            ForeCanvas.Children.Remove(_foreImage[dy, dx]);
            _foreData[dy, dx] = (int)ForeState.NONE;
        }

        // FriedMine(dy, dx);等待后补
    }

    // 是否胜利判断
}

实现了主要状态判断和动作，踩雷和胜利判断的情况因为要使用动画效果，所以这里先留空，待后再做。

（4）添加鼠标右键功能
编辑xaml文件，在ForeCanvas元素内添加MouseRightButtonDown="ForeCanvas_MouseRightButtonDown"，后台代码：

private void ForeCanvas_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
    if (_gameState == GameState.NONE)
        return;

    // 获取鼠标点击的格子位置
    Point mousePoint = e.MouseDevice.GetPosition(ForeCanvas);
    int dx = (int)(mousePoint.X / _cellSize.Width);
    int dy = (int)(mousePoint.Y / _cellSize.Height);

    // 已打开区域
    if (_foreData[dy, dx] == (int)ForeState.NONE)
        return;

    if (ForeCanvas.Children.Contains(_foreImage[dy, dx]))
    {
        // 循环前景数据
        _foreData[dy, dx]++;
        if (_foreData[dy, dx] > )
        {
            _foreData[dy, dx] = ;
        }

        // 设置相应的图片（原始、红旗、问号）
        _foreImage[dy, dx].Source = ImageHelper.CutImage(_bmpForeground,
            new Int32Rect((_foreData[dy, dx]- ) * _cellSize.Width, , _cellSize.Width, _cellSize.Height));

        // 计算地雷数
        int num = ;
        for (int y=; y<_gameLevel._colGrid; y++)
        {
            for (int x=; x<_gameLevel._rowGrid; x++)
            {
                if (_foreData[y, x] == (int)ForeState.FLAG)
                    num++;
            }
        }
        textBlockMineNum.Text = (_gameLevel._mineNum - num).ToString();

        // 待加胜利检测
    }
}

每单击一次右键，将相应的单元格的图片从原始-红旗-问号-原始，循环递增，并重新计算显示的地雷数。

十五、添加判断是否胜利
看注释的判断。

private bool IsWin()
{
    bool flag = true;
    for (int y = ; y < _gameLevel._colGrid; y++)
    {
        for (int x = ; x < _gameLevel._rowGrid; x++)
        {
            // 地雷未被红旗标记
            if (_backData[y, x] == (int)BackState.MINE && _foreData[y, x] != (int)ForeState.FLAG)
            {
                flag = false;
                break;
            }

            // 存在未打开格子或标记为问号的格子
            if (_foreData[y, x] == (int)ForeState.NORMAL || _foreData[y, x] == (int)ForeState.QUESTION)
            {
                flag = false;
                break;
            }
        }

        if (!flag)
            break;
    }

    return flag;
}

将该方法添加到前景ForeCanvas控件的左、右键事件中进行调用。

if (IsWin())
{
    WinProcess();
}

这是胜利后的处理方法：先停止计时，然后重新覆盖前景图片，启用计时动画事件，从下往上逐消去前景图片：

private void WinProcess()
{
    // 停止计时
    _stopWatchGame.Stop();
    _timerSetTimeText.Stop();
    _gameState = GameState.NONE;

    // 重新覆盖前景图片
    ForeCanvas.Children.Clear();
    for (int y=; y<_gameLevel._colGrid; y++)
    {
        for (int x=; x<_gameLevel._rowGrid; x++)
        {
            _foreImage[y, x] = new Image();
            _foreImage[y, x].Source = ImageHelper.CutImage(_bmpForeground, new Int32Rect(, ,
                   _cellSize.Width, _cellSize.Height));

            _foreImage[y, x].SetValue(Canvas.LeftProperty, x * (double)_cellSize.Width);
            _foreImage[y, x].SetValue(Canvas.TopProperty, y * (double)_cellSize.Height);
            ForeCanvas.Children.Add(_foreImage[y, x]);
        }
    }

    // 动画行数
    iCount = _gameLevel._colGrid - ;

    _timerWinAnim.Start();
}

这是计时动画事件方法：

private void _timerWinAnim_Tick(object sender, EventArgs e)
{
    if (iCount >= )
    {
        Storyboard sb1 = new Storyboard();
        DoubleAnimation daOpacity = null;

        for (int x = ; x < _gameLevel._rowGrid; x++)
        {
            if (_backData[iCount, x] == (int)BackState.MINE)
            {
                SetCellFore(x, iCount, ForeState.FLAG);
                continue;
            }

            daOpacity = new DoubleAnimation();
            daOpacity.From = 1d;
            daOpacity.To = 0d;
            daOpacity.Duration = new Duration(TimeSpan.FromMilliseconds());

            Storyboard.SetTarget(daOpacity, _foreImage[iCount, x]);
            Storyboard.SetTargetProperty(daOpacity, new PropertyPath("(Image.Opacity)"));

            sb1.Children.Add(daOpacity);
        }

        sb1.Begin();
        iCount--;
    }
    else
    {
        _timerWinAnim.Stop();

         if (MessageBox.Show("你胜利了。要重新开始吗？", "恭喜", MessageBoxButton.OKCancel, MessageBoxImage.Information)
                    == MessageBoxResult.OK)
        {
            MenuGameStart_Click(null, null);
        }
    }
}

十六、踩雷后的处理
为了不让主程序复杂化，我们另外创建一个Bomb的新类

public class Bomb
{
    Image bombImg = new Image();
    BitmapSource bmpBomb = null;
    const int FRAME_COUNT = ;
    BitmapSource[] bmpSourceBomb = new BitmapSource[FRAME_COUNT];
    int currFrame = ;
    DispatcherTimer timerBomb;
    Canvas _canvas = new Canvas();
    int dx, dy;

    public Bomb(Canvas canvas, int dx, int dy, BitmapSource bmpImgBomb)
    {
        _canvas = canvas;
        this.dx = dx;
        this.dy = dy;
        bmpBomb = bmpImgBomb;

        for (int i=; i<FRAME_COUNT; i++)
        {
            bmpSourceBomb[i] = ImageHelper.CutImage(bmpBomb, new System.Windows.Int32Rect(i * , , , ));
        }

        timerBomb = new DispatcherTimer();
        timerBomb.Interval = TimeSpan.FromMilliseconds();
        timerBomb.Tick += TimerBomb_Tick;
    }

    private void TimerBomb_Tick(object sender, EventArgs e)
    {
        bombImg.Source = bmpSourceBomb[currFrame];
        currFrame++;
        if (currFrame == )
        {
            currFrame = ;

            if (_canvas.Children.Contains(bombImg))
            {
                _canvas.Children.Remove(bombImg);
            }

            timerBomb.Stop();
        }
    }

    public void DrawBomb()
    {
        if (!_canvas.Children.Contains(bombImg))
            _canvas.Children.Add(bombImg);

        Canvas.SetLeft(bombImg, dy * );
        Canvas.SetTop(bombImg, dx * );

        timerBomb.Start();
    }

    public System.Drawing.Point GetPosition()
    {
        return new System.Drawing.Point(dx, dy);
    }
}

创建实例时，一并将相关参数传递过去。然后调用DrawBomb在启动内部计时器，该计时器顺序更新前景图片源，从而实现爆炸效果。

主程序添加两个字段：

private Bomb[] bombs;
private int bombCount = ;

在InitGameData方法中进行初始化：

bombs = new Bomb[_gameLevel._mineNum];

踩雷动作方法：

private void FriedMines(int y, int x)
{
    if (_backData[y, x] == (int)BackState.MINE)
    {
        _backImage[y, x].Source = ImageHelper.CutImage(_bmpBomb, new Int32Rect( * _cellSize.Width, ,
            _cellSize.Width, _cellSize.Height));
    }

    int bombCount = ;
    for (int j=; j<_gameLevel._colGrid; j++)
    {
        for (int i=; i<_gameLevel._rowGrid; i++)
        {
            if (_backData[j,i] == (int)BackState.MINE && _foreData[j,i] != (int)ForeState.NONE
                && ForeCanvas.Children.Contains(_foreImage[j,i]))
            {
                bombs[bombCount++] = new Bomb(ForeCanvas, j, i, _bmpBomb);
            }
        }
    }

    _timerBomb.Start();
}

现在遍历游戏区，在有地雷的位置创建Bomb实例，然后启动_timerBomb计时事件。

private void _timerBomb_Tick(object sender, EventArgs e)
{
    bombs[bombCount].DrawBomb();
    ForeCanvas.Children.Remove(_foreImage[bombs[bombCount].GetPosition().X, bombs[bombCount].GetPosition().Y]);
    bombCount++;

    if (bombCount == (bombs.Length - ))
    {
        bombCount = ;
        _timerBomb.Stop();
    }
}

该计时器按顺序调用Bomb类的DrawBomb方法，实现爆炸效果。

在ForeCanavas的左键事件中调用该方法，处理踩雷事件。

if (_backData[dy, dx] == (int)BackState.MINE)
{
    if (ForeCanvas.Children.Contains(_foreImage[dy, dx]))
    {
        ForeCanvas.Children.Remove(_foreImage[dy, dx]);
    }

    FriedMines(dy, dx);

    _gameState = GameState.NONE;
    _stopWatchGame.Stop();
}

先到这里了，其他次要功能就不再这里啰嗦了。

另外：发现个小问题，如果困难难度踩着地雷的话，按原来设定的时间间隙，99个地雷爆炸需要比较长时间。这样调整下：

在InitGameData方法中的switch里，分别添加一行：

case  Level.SIMPLE:
    ...
    _timerBomb.Interval = new TimeSpan(, , , , );
    ...

case Level.NORMAL:
    ...
   _timerBomb.Interval = new TimeSpan(, , , , );
    ...

case Level.HARD:
   ...
   _timerBomb.Interval = new TimeSpan(, , , , );
   ...