What is Graphical User Interface
The Graphical Uer Interface GUI is one of the most revolutionary changes to occur in the evolution of the modern computing system .GUIs Can stimulate a very realistic view of a real , three- dimensional world.
Macintosh toolbox , Microsoft Windows and X-windows are some examples of GUIs.
Common features of GUIs
1.Secondary user-input devices. Usually a pointing device and typically a mouse.
- Point and shoot functionality under control of device , which cause screen menus to appear or disappear.
- Icons that represents files , directories and other applications and system entities.
- Dialog box , boxes , buttons , sliders , check boxes and many other graphical metaphors that let the programmer and user tell the computer what to do and how to do it.
Common Graphics User Interface :-
- selecting objects on the screen
- Moving objects around the screen
- Merging several objects into another object
A Symbol that appears on the display screen and that you move to select objects and commands.
Bit-Maped Displays :
Bit-Maped Displays have advantage over character displays. bit displays characters-based displays screens.
When a screen is split into several independent regions , each one is called a windows.
A menu Displays a list of commons avaliable within an appliaction .
Dialog boxes allow more complex interaction between the user and the computer .
Functionality of Graphical User Interface :-
- A Windowing System
- An Imaging model ,
- An Application Program Interface