For sketching, either the pen or puck is used. For tracing, the puck is preferred because its crosshairs, visible through a clear glass lens, lets you precisely pinpoint ends and corners of detailed drawings.
Most tablets allow parts of the tablet surface to be customized into buttons that can be tapped to select menus and functions in the application.
Digitizer Mode and Mouse Mode
Tablets typically support two modes of operation. "Digitizer mode" creates a one-for-one correspondence between tablet and screen. Wherever you make contact on the tablet is the exact location on screen that is effected. "Mouse mode" moves the screen pointer relative to any starting position on the tablet surface, just like a mouse.
The Output Is X-Y Coordinates
When drawing or tracing on the tablet, a series of x-y coordinates (vector graphics) are created, either as a continuous stream of coordinates, or as end points. See pen tablet, tablet PC and touch screen.
Digitizer Tablet
Drawings created or traced on tablets are stored as mathematical line segments. Objects are drawn with a pen or puck, but are traced with the puck.
A Tablet and Mouse on the Same Port
The Y-mouse adapter from P.I. Engineering lets you connect a tablet and mouse on the same port. The device's microprocessor converts mouse movement into pen movement so only the tablet driver is being used. (Image courtesy of P.I. Engineering, Inc., www.ymouse.com)
Digitizing Three Dimensions
The 3DRAW PRO 3D digitizer system from Polhemus records x, y and z coordinates of an object by touching its surfaces with a pen. It measures the tip position in 3D space and outputs directly to popular CAD and graphics programs. (Image courtesy of Polhemus, Inc.)
![]() | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
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