MOUSE

Definition of: mouse :

The most popular pointing device. Called a "mouse" because the cord resembled a mouse's tail, most mice today are cordless. Graphical interfaces (GUIs) are designed for mice but key commands for equivalent functions in business applications are often available as an alternative. However, CAD and imaging applications demand a pointing device. On a PC, the mouse connects to the PS/2 or USB port (see PS/2 connector).

After years of use, it is now known that mice can be hazardous to your health. Hours of clicking and dragging put a strain on the wrist (see carpal tunnel syndrome).

Relative Vs. Absolute
Mouse movement is relative. The cursor moves from its existing location. The mouse could be moved across your arm, and the screen cursor would move as well. The mouse-like object on a graphics tablet, which is correctly called the "tablet cursor" or "puck" is often not relative. It contacts the tablet with absolute reference. Placing it on the upper left part of the tablet moves the screen cursor to the corresponding location.

DIGITAL CAMERA



 

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Definition of: digital camera

A still camera that records images in digital form. Unlike traditional film cameras that record a light image on film (analog), digital cameras record discrete numbers for storage on a flash memory card or optical disc. As with all digital devices, there is a fixed, maximum resolution and number of colors that can be represented. Images are transferred to the computer with a USB cable, a memory card or wireless. Digital video cameras (see camcorder) also use FireWire.

Digital Advantages
There are three distinct advantages of digital cameras over their analog counterparts. First, you can review the finished image immediately and erase the others. Second, you can take and print one picture without waiting to develop an entire roll of film. Finally, memory cards, the storage mechanism most widely used for "digital film," are reusable over and over.

JOYSTICK

Definition of: joystick

A pointing device used to move an object on screen in any direction. It employs a vertical rod mounted on a base with one or two buttons. Joysticks are used extensively in video games and in some CAD systems. They are also just one element in more elaborate game controllers (see video game controller). The term comes from the main control stick in a small airplane.

INTRODUCTION

INTRODUCTION

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