void MainGameWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    QPixmap bmpBlocks(":/res/blocks.bmp");
    QPixmap bmpFaces(":/res/faces.bmp");
    QPixmap bmpFrame(":/res/frame.bmp");
    QPixmap bmpNumber(":/res/timenumber.bmp");

    // 繪製笑臉
    switch(game->gameState)
    {
    case OVER:
        painter.drawPixmap((game->mCol * blockSize + offsetX * 2) / 2 - 12, spaceY / 2, bmpFaces, 0 * 24, 0, 24, 24); // 24是笑臉的邊長,錨點在左上，因為工具欄佔了些，所以看起來不再中間
        break;
    case PLAYING:
        painter.drawPixmap((game->mCol * blockSize + offsetX * 2) / 2 - 12, spaceY / 2, bmpFaces, 1 * 24, 0, 24, 24);
        break;
    case WIN:
        painter.drawPixmap((game->mCol * blockSize + offsetX * 2) / 2 - 12, spaceY / 2, bmpFaces, 2 * 24, 0, 24, 24);
        break;
    default:
        painter.drawPixmap((game->mCol * blockSize + offsetX * 2) / 2 - 12, spaceY / 2, bmpFaces, 1 * 24, 0, 24, 24);
        break;
    }

    // 繪製剩餘雷數
    int n = game->curMineNumber;
    int posX = (game->mCol * blockSize + offsetX * 2) / 2 - 50; // 最後一位數字的橫座標
    if(n <= 0) // 如果雷數為0或者減到0以下，單獨繪製
    {
        painter.drawPixmap(posX, spaceY / 2, bmpNumber, n * 20, 0, 20, 28); // 20是數字的寬，28是高
    }
    while(n > 0) // 如果是多位數
    {
        painter.drawPixmap(posX - 20, spaceY / 2, bmpNumber, n % 10 * 20, 0, 20, 28); // 每次從後面繪製一位
        n /= 10;
        posX -= 20;
    }

    // 繪製雷區
    for(int i = 0; i < game->mRow; i++)
    {
        for(int j = 0; j < game->mCol; j++)
        {
            switch(game->gameMap[i][j].curState)
            {
            // 根據不同的方塊狀態繪製，算出在bmp中的偏移量
            case UN_DIG:
                painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY , bmpBlocks, blockSize * 10, 0, blockSize, blockSize);
                break;
            case DIGGED:
                painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY, bmpBlocks, blockSize * game->gameMap[i][j].valueFlag, 0, blockSize, blockSize);
                break;
            case MARKED:
                painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY, bmpBlocks, blockSize * 11, 0, blockSize, blockSize);
                break;
            case BOMB:
                painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY, bmpBlocks, blockSize * 9, 0, blockSize, blockSize);
                break;
            case WRONG_BOMB:
                if(game->gameState == PLAYING || game->gameState == FAULT)
                {
                    // 如果還在遊戲中就顯示旗子
                    painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY, bmpBlocks, blockSize * 11, 0, blockSize, blockSize);
                }
                else if(game->gameState == OVER)
                {
                    // 如果遊戲已經結束，就顯示標錯了
                    painter.drawPixmap(j * blockSize + offsetX, i * blockSize + offsetY + spaceY, bmpBlocks, blockSize * 12, 0, blockSize, blockSize);
                }
                break;
            default:
                break;
            }
        }
    }
    // 處理遊戲狀態
    handleGameState(game);
}