2.  What are graphics?
 Simply they are the images them selves
 How can we represent an image in computer?
 Image is a collection (2D array) of pixels, each
pixel represents a color that is a combination of
Red, Green and Blue colors (RGB system)
 Pixel values may range from 0 to 255
 Graphics system
 S/W: computerized programmes for images
manipulation and control
 H/W: for displaying pixels (CRT, LCD, ...)

3.  Sequence of identical frames that differ only
on the position of the moving object
 Example:
 To draw a man waving his hand, we draw a
sequence of identical frames in which all body
parts are in-variant except the hand

4. 1. Initialize
2. Update positions
3. Draw
4. Go to step no. 2

5.  STAR

6.  STAR

7.  STAR

8.  Operating systems provide services to
programmers
 These services can be, opening and reading
from a file, drawing pixels, moving pixels,...
Etc (services are called system calls)
 API (Application Programming Interface) is a
set of built-in functions that provides access
to system calls
 Examples:
 Win 32 API for windows systems
 Posix API for POSIX-based systems (Unix,
Linux,...)

9.  #include <windows.h>
 One library of those who exist in Win 32 API
 Here We are interested in only one data type
and one function
 COORD point;
 point.X = 10;
 point.Y = 10;
 SetConsoleCursorPosition
(GetStdHandle(STD_OUTPUT_HANDLE), point);

10.  Draw a star that moves on all the screen,
given that max console width is 80 pixels and
max height is 15 pixels
 Draw an empty square that fits the console
boundaries

11.  Main map
 Moving snake
 Snake collision with console boundaries
 Food
 Increasing snake length
 Snake collision with it self
 Score
 Speed
 User Interface
 Files – Highest Scores