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Unit 4: Secondary Storage Devices
Notes
Figure 4.7: Point and Draw Device
4.2.1.3 Mouse
Mouse is the most popular point-and-draw device. It is a must-have input device on modern
personal computers and workstations because they support GUI as their primary user
interface. A mouse is a small hand-held device that fits in a users palm comfortably. It rolls
on a small bearing and has one or more buttons on the top. When a mouse that is connected
to a user terminal is rolled on a flat surface, a graphics cursor moves on the terminal screen
in the direction of the mouses movement. Since all movements of the mouse are reproduced
by the graphics cursor on the screen, you can move the graphics cursor at a menu item or
an icon by moving the mouse.
Figure 4.8: Mouse
The graphical cursor is displayed as a variety of symbols such as an arrow, a wrist a
pointing finger etc. Depending on the application, the text and graphics cursor may be
displayed on the screen at the same time. The graphics cursor, irrespective of its size and
shape, has a pixel-size point that is considered the point of reference to decide where the
cursor is positioned on the screen. This point is called hot-spot of the graphics cursor when
the hot-spot is positioned at a menu item or an icon, the graphics cursor is said to point
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