Computer Graphics input devices, Lecture notes of Computer Graphics

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Computer Graphics

Chapter 2

Input Devices

1

Input Devices

• (^) Logical Input Devices
  • (^) Categorized based on functional characteristics.
  • (^) Each device transmits a particular kind of data.
  • (^) The different types of data are called input primitives.
• (^) Physical Input Devices
  • (^) Categorized based on the physical machine. RM [2]- 2

Logical Input Devices

• (^) String Devices
  • (^) Input Primitive: A string of characters
  • (^) Example: Keyboard
  • (^) Applications: Text input RM [2]- 4

Logical Input Devices

• (^) Valuator
  • Input primitive: Scalar values (typically between 0 and 1).
  • (^) Examples: Control Dials, Sensing devices, Joysticks
  • (^) Applications: Input of graphics parameters, Graphics representation of analog values, Process simulation, Games. RM [2]- 5

Logical Input Devices

• (^) Pick
  • (^) Input primitive: Selection of a part of the screen.
  • (^) Examples: Mouse, Cursor Keys, Tablet.
  • (^) Applications: Interactive editing and positioning. RM [2]- 7

Physical Input Device for

Iteraction

Two primary types:

1.Pointing Devices:Indicate position on

screen

2.Keyboard/positioning Devices: To add new

item

8

Mechanical Mouse

10

Optical Mouse

11

Tablets/Digitizer

13

Light Pen

14

Touch Panels

RM [2]- 16

Data Glove

17