用C++代写一个console的画图板，练习基本的object-oriented programming设计。
Expected Learning Outcomes
- familiarise themselves with at least one high level language programming environment.
- develop a structured and documented computer program.
- understand the fundamentals of object-oriented programming and apply it in computer program development.
- apply the computer programming techniques to solve practical problems.
Introduction
In this assignment, you are going to develop a Console Drawing Board that runs
in the command line environment. User can input commands to generate different
patterns in the drawing area.
This is a group assignment. You need to form a group with 5 to 6 students, and
write a Win32 Console Application program called drawing.cpp. This is a text-
based drawing board with the following requirements.
System Requirements
When the program starts, the console should display a welcome message, and
then the System Menu of the program. User can enter the options of the
corresponding actions.
Welcome Message designed by your group
*** System Menu ***
[1] Start Drawing
[2] Change Board Size
[3] Instructions
[4] Credits
[5] Exit
*******************
Option (1 - 5):
Start Drawing
When the user inputs 1 in the System Menu, an empty drawing board is displayed
with a pen in the middle. Then the user controls the pen in the drawing board
by inputting commands, until a “QUIT” command is entered.
Drawing Board
The drawing board consists of a square drawing area with a default size 30 x
30. The area is enclosed by a boundary with characters ‘|’ for vertical
boundary, ‘-‘ for horizontal boundary, and ‘+’ for the corner.
Pen
The initial location of the pen is in the middle of the drawing area. Then
based on the user control, the pen can move within the drawing area. An arrow
character is displayed in the drawing area to indicate the current location of
the pen.
The pen is represented by different arrow characters according to the
direction it is facing. There are 8 available directions, with 45 o each
(default is 0, i.e. upward). The corresponding ASCII code in decimal of each
arrow is given.
User Control
User can input one or multiple commands at a time to control the action of the
pen. You may assume that user always input less than 200 characters each time.
If multiple commands are input, they must be separated by at least one space.
The commands are case-insensitive.
The commands are executed one by one in the sequence of user input. When all
commands have been executed, the drawing board is refreshed to show the most
updated drawings. Then the user can input another set of commands again.
Appropriate error checking on user input of commands is expected. Whenever an
error occurs, an error message should be displayed. All remaining commands
will be ignored. The drawing board is then refreshed to show the most updated
status.
For example, an erroneous input may look like:
FD 10 RT 90 BK LT 45
Only “FD 10” and “RT 90” are executed because the argument for command “BK” is
missing. The last command “LT 45” is ignored and not executed.
Quit
When the user inputs the command “QUIT”, the system prompts for user’s
confirmation. If the user inputs ‘y’ or ‘Y’, the system returns back to the
System Menu. If the user inputs ‘n’ or ‘N’, the system remains at the drawing
board. Other input is not acceptable and the system should ask the user to
confirm again.
Change Board Size
When the user inputs 2 in the System Menu, the system displays the current
size (length of a side, default is 30). Then the user is allowed to input the
new size within the range of 20 to 50, inclusively. After the input, the
system returns back to the System Menu.
Instructions
The system displays the instructions for using the console drawing board.
After displaying the instruction, the system returns back to the System Menu.
Credits
The system displays the personal particulars (e.g. student name, student ID,
class, tutorial group, etc.) of the group members. After displaying the
information, the system returns back to the System Menu.
Exit
When the user inputs this option, the system prompts for user’s confirmation.
If the user inputs ‘y’ or ‘Y’, the program terminates. If the user inputs ‘n’
or ‘N’, the system returns to the System Menu. Other input is not acceptable
and the system should ask the user to confirm again.
Other General Requirements
- Meaningful guidelines should be printed to assist with user’s input. Whenever an option is selected, meaningful messages should be displayed.
- Suitable checking on user’s input is expected. Appropriate error messages should be printed whenever unexpected situation happens, e.g., invalid input, input out-of-range, etc.
- The use of functions (in addition to main function) and classes are expected in your program. Appropriate comments should be added in your source code file.
- Creativity and Critical Thinking: other features that you find useful or can enhance the user experience can also be implemented.
