Android Flutter实现在多端运行的扫雷游戏

class GameSetting {
  GameSetting._();
}

static final GameSetting _default = GameSetting._();
factory GameSetting() => _default;

///游戏的难度，默认为8*8
int difficulty = 8;

///雷的数量 (格子总数 * 0.18 向下取整)，通常扫雷的雷数在0.16-0.2之间。
int get mines => (difficulty * difficulty * 0.18).floor();

List<Color> c_5ADFD0 = [
  Color(0xFF299794),
  Color(0xFF2EC4C0),
  Color(0xFF2EC4C0)
];

List<Color> c_A0BBFF = [
  Color(0xFF5067C5),
  Color(0xFF838CFF),
  Color(0xFFA0BBFF),
];

///默认主题
Color themeColor = Color(0xFF5ADFD0);

late List<List<int>> board; // 棋盘
late List<List<bool>> revealed; // 记录格子是否被翻开
late List<List<bool>> flagged; // 记录格子是否被标记
late bool gameOver; // 游戏是否结束
late bool win; // 是否获胜

late int numRows; // 行数
late int numCols; // 列数
late int numMines; // 雷数

//游戏时间
late int _playTime;

numRows = gameSetting.difficulty;
numCols = gameSetting.difficulty;
numMines = gameSetting.mines;
// 初始化棋盘
board = List.generate(numRows, (_) => List.filled(numCols, 0));
// 初始化格子是否被翻开
revealed = List.generate(numRows, (_) => List.filled(numCols, false));
// 初始化格子是否被标记
flagged = List.generate(numRows, (_) => List.filled(numCols, false));
// 将游戏定义为未结束
gameOver = false;
// 将游戏定义为还未获胜
win = false;

int numMinesPlaced = 0;
while (numMinesPlaced < numMines) {
	...
}

int i = Random().nextInt(numRows);
int j = Random().nextInt(numCols);

if (board[i][j] != -1) {
  board[i][j] = -1;
  numMinesPlaced++;
}

for (int i = 0; i < numRows; i++) {
  for (int j = 0; j < numCols; j++) {
    ...
  }
}

if (board[i][j] != -1) {
  int count = 0;
  for (int i2 = max(0, i - 1); i2 <= min(numRows - 1, i + 1); i2++) {
    for (int j2 = max(0, j - 1);
        j2 <= min(numCols - 1, j + 1);
        j2++) {
      if (board[i2][j2] == -1) {
        count++;
      }
    }
  }
  board[i][j] = count;
}

void reveal(int i, int j) {
	revealed[i][j] = true;
}

if (board[i][j] == -1) {
  //将所有的地雷翻开,告诉用户所有的地雷位置
  for (int i2 = 0; i2 < numRows; i2++) {
    for (int j2 = 0; j2 < numCols; j2++) {
      if (board[i2][j2] == -1) {
        revealed[i2][j2] = true;
      }
    }
  }
  //游戏结束
  gameOver = true;
	//结束动画
	...
}

if (board[i][j] == 0) {
  for (int i2 = max(0, i - 1); i2 <= min(numRows - 1, i + 1); i2++) {
    for (int j2 = max(0, j - 1); j2 <= min(numCols - 1, j + 1); j2++) {
      if (!revealed[i2][j2]) {
        reveal(i2, j2);
      }
    }
  }
}

///它会遍历整个棋盘，检查每一个未被翻开的格子是否都是地雷，
bool checkWin() {
  for (int i = 0; i < numRows; i++) {
    for (int j = 0; j < numCols; j++) {
      if (board[i][j] != -1 && !revealed[i][j]) {
        return false;
      }
    }
  }
  return true;
}


if (checkWin()) {
  win = true;
  gameOver = true;
  _timer?.cancel();
  //获胜动画
  ...
}

enum BlockType {
  //数字
  figure,
  //雷
  mine,
  //标记
  label,
  //未标记（未被翻开）
  unlabeled,
}

GridView.builder(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
    crossAxisCount: numCols,
    childAspectRatio: 1.0,
  ),
  itemBuilder: (BuildContext context, int index) {
  	...
  }
)

itemBuilder: (BuildContext context, int index) {
  int i = index ~/ numCols;
  int j = index % numCols;
  BlockType blockType;	
//格子被翻开
 if (revealed[i][j]) {
   //是地雷
   if (board[i][j] == -1) {
     blockType = BlockType.mine;
   } else {
     blockType = BlockType.figure;
   }
 } else {
   //被用户标记
   if (flagged[i][j]) {
     blockType = BlockType.label;
   } else {
     blockType = BlockType.unlabeled;
   }
 }
  return GestureDetector(
    onTap: () => reveal(i, j),
    onDoubleTap: () => toggleFlag(i, j),
    child: BlockContainer(
      backColor: gameSetting.themeColor,
      value: revealed[i][j] && board[i][j] != 0 ? board[i][j] : 0,
      blockType: blockType,
    ),
  );
},

///标记雷
void toggleFlag(int i, int j) {
  if (!gameOver) {
    setState(() {
      flagged[i][j] = !flagged[i][j];
    });
  }
}

String get playTime {
  int minutes = (_playTime ~/ 60); // 计算分钟数
  int seconds = (_playTime % 60); // 计算秒数
  //padLeft方法用于补齐不足两位的数字，第一个参数是补齐后的字符串总长度，第二个参数是用于补齐的字符。
  return '${minutes.toString().padLeft(2, '0')}:${seconds.toString().padLeft(2, '0')}';
}