Tetris (7)

1. Modify your previous TETRIS program and define a class CTetromino.
2. A tetromino has the following data members:
   1. unsigned short type_id; // [0..6]
   2. unsigned short pos_x;
   3. unsigned short pos_y;
3. A tetromino has the following member functions:
   1. The constructor CTetromino() will be invoked with three parameters to initialize data members type_id, pos_x, and pos_y.
      • The default values of these three parameters are all 0.
   2. Draw() - display the tetromino at position (pos_y, pos_x).
   Test your class with this main program. Save your class definition as "tetris.h". Save the main program as "tetris-7a.cpp". Compile the program with "g++ tetris-7a.cpp -lcurses". The program should produce output as follows.
   
4. Add a member function Move(). It has a parameter to indicate the direction of movement.
   • In this version, we shall only invoke with the argument "down", while in the next version we'll add the handling of "left" and "right".
   • When the Move() function is called with argument "down", the data member pos_y of tetromino will increment by 1, unless it reaches the bottom border.
   • If pos_y successfully increments, this function returns 1. If it fails, the return value is 0.
   Test your class with this main program. The program should produce output as follows.