SELECT THE PROPER DEVICE BASED CONTROLS

1. USER INTERFACE DESIGN PROCESS
• KYOW YOUR USER DCLIENTs
• UNDERSTAND THE BUSINESS FUNCTIONS
• UNDERSTAND THE PRINCIPLES OF GOOD SCREEN
DESIGN
• DEVELOP SYSTEM MENUS AND NAVIGATION
SCHEMES
• SELECT THE PROPER KINDS OF WINDOWS
• SELECT THE PROPER DEVICE BASED CONTROLS

2. CONTD..
• WRITE CLEAR TEXT AND MESSAGES
• PROVIDE EFFECTIVE FEEDBACK AND
GUIDANCE AND ASSISTANCE
• PROVIDE EFFECTIVE INTERNALIZATION AND
ACCESSIBILITY
• CREATE MEANINGFUL GRAPHICS,ICONS AND
IMAGES
• CHOOSE THE PROPER COLURS

3. CONTD..
• ORGANIZE AND LAYOUT WINDOWS AND
PAGES
• TEST ,TEST AND RETEST

4. DEVICE BASED CONTROLS
• Input Devices: Through which people
communicate to system.
TRACKBALL
JOYSTICK
GRAPHICS TABLET
LIGHT PEN
TOUCH SCREEN
VOICE
MOUSE
KEYBOARD

5. TYPES OF DEVICE CONTROLL
• Operated on the screen itself-DIRECT DEVICES
Eg:light pen, touch screen
• Other than the screen :INDIRECT DEVICES
Eg:Mouse,Keyboard

6. USE OF DEVICE BAESD CONTROL
• To point an object on the screen
• To select an object
• To drag
• To track or follow a moving object
• To position an object
• To enter or manipulate information

7. TRACKBALL
• A spherical object(ball) that rotates freely
• Direction and speed is translated in to cursor
movement
• Well suited for video games or 3D
Environments

9. CONTD..
• ADVANTAGES
Direct relationship between hand and pointer in
terms of direction and speed
Does not require additional desk space
• DISADVANTAGES
5 finger movement is needed
indirect control
difficult to control
requires a degree of eye hand coordination

10. JOYSTICK

11. CONTD..
• Stick /bat shaped device in variable sizes
• It responds by exerting pressure on them
• Some permits continuous movement, some
others support vertical & horizontal
movement
• Direct relation between pointer and hand in
terms of direction.
• Indirect relation between hand and pointer in
terms of speed and distance

12. GRAPHIC TABLET
• Sensitive horizontal surfaces .
• We can operated with fingers ,light pen,
object like stylus
• Requires additional desk space
• Direct relationship in terms of speed ,distance
and direction

13. TOUCH SCREEN..
• Screen which is sensitive to finger or stylus
• Direct relationship in terms of speed ,distance
and direction
• Does not require additional desk space
• May damage the screen

14. LIGHT PEN
• Screen can be controlled by a pen or stylus
• Direct relationship in terms of speed ,distance
and direction
• More accurate than finger touching.

15. VOICE
• Automatic speech recognition by the
computer
• Useful when people does not use keyboard
• Simple and direct
• Difficult to use in noisy environment
• High error rates

16. MOUSE
• A rectangular or dome shaped movable device
containing one to three buttons used to
manipulate objects on the screen
• Direct relationship in terms of speed ,distance
and direction
• Requires additional desk space

17. KEYBOARD
• Standard typewriter keyboard and cursor
movement keys
• No direct relation ship between finger
movement on the keyboard and cursor
movement on the screen
• Keyboard accelerators: way to access menu
elements without displaying a menu

18. How to select one?????
• Factors
 Task
 User
 Environment
 Hardware
 The device in relation to application
 Minimizing eye and hand movements

19. CONTD..
• Pointer Guidelines
 Should be visible all times
 Shape should clearly indicate the purpose of movement
 Should maintain fixed size
 Do not create new shapes for already defined standard
functions
 User should always position the pointer