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IE 201 - Intermediate Programming
Homework 3
due April 29
th, 2014
SHAPE ANIMATOR
In this assignment, you will write a program that will print randomly moving squares and triangles on the screen,
with random colors, random speed and random direction. The initial x coordinate and the area of each falling object
are also expected to be random.
The user will be able to change the speed of the program with keyboard inputs. The user should adjust the speed of
the falling objects by pressing 1 (slow down) and 2 (speed up).
While the random shapes are moving, there will be another shape (a two by two square with a color of your choice)
controlled by the user, which can move in four directions and destroy other shapes. The buttons to press for
movement in different directions are w for up, s for down, a for left and d for right. When this shape has at least one
pixel intersecting with another shape, it will make the corresponding shape disappear from the screen if the user
presses f.
The sample program you have been given demonstrates how to write a specific character with specific colors on the
screen at a specific coordinate. The code also tries to demonstrate how to get non-intrusive inputs from the keyboard.
As you know, if you use cin to get input from the user, the program stops and waits until the user enters a value and
hits the return key. However _kbhit() instantaneously checks if the user has hit any key on the keyboard up to that
time. If not, returns false and continues; otherwise returns true. The pressed key can be retrieved as an ASCII
character by using the _getch() function.
YOUR TASK
You will implement a C++ program that animates moving squares and triangles on the screen along with another one
which is user controlled and can destroy other objects. You will use Console class in the sample program as a basis
for your source code. Following guidelines should be followed in the implementation:
Size, direction and color of the falling objects must be set in the constructor and should not be changed in
the object's lifetime. These attributes must be assigned randomly. Size should be between
MAX_OBJECT_SIZE and MIN_OBJECT_SIZE. Direction will be one of the following: from left to right,
from right to left, from top to bottom, and from bottom to top. Remember console is an 25 (x axis) by 80 (y
axis) rectangle with (0, 0) being the top left corner.
A new object must be created when either an object is destroyed by the user or when an object exits the
boundaries of the console. You must specify the number of objects on the screen by using #define
directive. You can also use #define for other parameters that you introduce.
#define OBJECT_COUNT 10
You must not use global functions and global data.
Be careful about memory leaks. Your program should run forever without problem.
You must use inheritance and polymorphism concepts in your program. Any other solution method will get
0.
You will get 0, if you do not use Console class in the sample program given.
Each class must be defined in a separate .h file and each of them must be implemented in a separate .cpp
file.
GRADING
Your homework will be graded on correctness and design. Understandability is considered to be an important aspect
of good design. An understandable program:
Uses a consistent and appropriate indentation scheme. All statements that are nested within acompound
statement (if, switch, while, for, do...while) should be indented.
Uses descriptive identifiers. The names of variables, constants, structure, types, and functions should
indicate their purpose. Remember C++ can handle identifiers of any length.
Contains carefully worded comments.
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