Input Devices

Theory of Computation & Computer Graphics — Introduction of Computer Graphics, NEC licence examination syllabus (Nepal Engineering Council).

Input Devices

How does a human's physical movement become data a graphics program can use?

🖱️ The Common Input Devices

Mouse / KeyboardStandard pointing and text input.

JoystickPositional input, common in gaming and simulation.

Light penA pen-like device that detects light directly from a CRT screen to determine position — largely historical now.

DigitizerConverts hand-drawn strokes (on a tablet) into digital coordinate data.

ScannerConverts a physical image/document into digital pixel data.

💡 One-liner: name one input device suited for freehand drawing input (digitizer/tablet) versus one suited for digitizing an existing physical document (scanner).

Syllabus points

Mouse, keyboard, joystick, light pen, digitizer, scanner

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