SOLVED ASSIGNMENT 1 CODE 1431 AUTUMN 2015
Q 2:
Ans:
PURPOSE OF POINT AND DRAW DEVICE.
A point and draw device of a computer includes: a X axis
and Y – axis driving gear system respectively mounted in a housing and
generally orienting perpendicularly with each other, and a driving plate for
driving the two gear systems slid ably held in the housing having an actuating
portion protruding upwardly from the driving plate through a top window formed
in an upper cover of the housing, whereby upon coordinative moving of the
driving plate to move the X-axis or Y-axis driving gear system, a movement
pulse signal can be electronically sensed for encoding the pulse signals into
the computer to be decoded and red for moving a cursor on a CRT screen of the
computer corresponding to the movement of the driving plate in the housing for
an effective, reliable and ergonomic manipulation of the point and draw device.
The most common input devices are by far and keyboard and
the mouse, which is a point and draw device. Most of our interaction with a
computer is performed using one of these or a combination of the two. However there
are many kinds of input devices that serve special needs.
There are several kinds of point and draw devices. The
most notable is the mouse. Others include the following.
Ø
Joystick
Ø
Trackball
Ø
Mouse pen
Ø
Digitizer tablet and pen
Ø
Track points
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