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The move(), rotate(), and isBlock() functions

The second section contains the logic to move or rotate the piece and determine its current location:

void Piece::move(int columnDelta, int rowDelta) {    column_ += columnDelta;    row_ += rowDelta;}void Piece::rotate() {    angle_ += 3;    angle_ %= 4;}bool Piece::isBlock(int column, int row) const {    static const char *Shapes[][4] = {        // I        {            " *  "            " *  "            " *  "            " *  ",            "    "            "****"            "    "            "    ",            " *  "            " *  "            " *  "            " *  ",            "    "            "****"            "    "            "    ",        },        // J        {            "  * "            "  * "            " ** "            "    ",            "    "            "*   "            "*** "            "    ",            " ** "            " *  "            " *  "            "    ",            "    "            "    "            "*** "            " *  ",        },        ...    };    return Shapes[kind_][angle_][column + row * PieceSize] == '*';}int Piece::getColumn() const { return column_;}int Piece::getRow() const { return row_;}

The move() function ...